forked from lix-project/lix
b6b142b4b1
Otherwise sandbox builds can fail, e.g. $ NIX_REMOTE=local?root=/tmp/nix nix-build '<nixpkgs>' -A hello --option build-use-substitutes false ... downloading ‘http://ftpmirror.gnu.org/bash/bash-4.3-patches/bash43-047’... error: unable to download ‘http://ftpmirror.gnu.org/bash/bash-4.3-patches/bash43-047’: Couldn't resolve host name (6)
3900 lines
129 KiB
C++
3900 lines
129 KiB
C++
#include "config.h"
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#include "references.hh"
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#include "pathlocks.hh"
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#include "globals.hh"
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#include "local-store.hh"
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#include "util.hh"
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#include "archive.hh"
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#include "affinity.hh"
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#include "builtins.hh"
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#include "finally.hh"
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#include "compression.hh"
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#include <algorithm>
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#include <iostream>
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#include <map>
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#include <sstream>
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#include <thread>
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#include <future>
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#include <chrono>
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#include <limits.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/utsname.h>
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#include <sys/select.h>
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#include <sys/resource.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <cstring>
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#include <pwd.h>
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#include <grp.h>
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/* chroot-like behavior from Apple's sandbox */
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#if __APPLE__
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#define DEFAULT_ALLOWED_IMPURE_PREFIXES "/System/Library /usr/lib /dev /bin/sh"
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#else
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#define DEFAULT_ALLOWED_IMPURE_PREFIXES ""
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#endif
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/* Includes required for chroot support. */
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#if __linux__
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/ip.h>
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#include <sys/personality.h>
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#include <sys/mman.h>
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#include <sched.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/syscall.h>
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#define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root, put_old))
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#endif
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#if HAVE_STATVFS
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#include <sys/statvfs.h>
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#endif
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namespace nix {
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using std::map;
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static string pathNullDevice = "/dev/null";
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/* Forward definition. */
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class Worker;
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struct HookInstance;
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/* A pointer to a goal. */
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class Goal;
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class DerivationGoal;
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typedef std::shared_ptr<Goal> GoalPtr;
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typedef std::weak_ptr<Goal> WeakGoalPtr;
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struct CompareGoalPtrs {
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bool operator() (const GoalPtr & a, const GoalPtr & b);
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};
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/* Set of goals. */
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typedef set<GoalPtr, CompareGoalPtrs> Goals;
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typedef list<WeakGoalPtr> WeakGoals;
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/* A map of paths to goals (and the other way around). */
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typedef map<Path, WeakGoalPtr> WeakGoalMap;
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class Goal : public std::enable_shared_from_this<Goal>
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{
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public:
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typedef enum {ecBusy, ecSuccess, ecFailed, ecNoSubstituters, ecIncompleteClosure} ExitCode;
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protected:
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/* Backlink to the worker. */
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Worker & worker;
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/* Goals that this goal is waiting for. */
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Goals waitees;
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/* Goals waiting for this one to finish. Must use weak pointers
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here to prevent cycles. */
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WeakGoals waiters;
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/* Number of goals we are/were waiting for that have failed. */
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unsigned int nrFailed;
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/* Number of substitution goals we are/were waiting for that
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failed because there are no substituters. */
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unsigned int nrNoSubstituters;
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/* Number of substitution goals we are/were waiting for that
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failed because othey had unsubstitutable references. */
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unsigned int nrIncompleteClosure;
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/* Name of this goal for debugging purposes. */
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string name;
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/* Whether the goal is finished. */
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ExitCode exitCode;
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Goal(Worker & worker) : worker(worker)
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{
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nrFailed = nrNoSubstituters = nrIncompleteClosure = 0;
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exitCode = ecBusy;
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}
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virtual ~Goal()
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{
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trace("goal destroyed");
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}
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public:
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virtual void work() = 0;
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void addWaitee(GoalPtr waitee);
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virtual void waiteeDone(GoalPtr waitee, ExitCode result);
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virtual void handleChildOutput(int fd, const string & data)
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{
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abort();
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}
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virtual void handleEOF(int fd)
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{
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abort();
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}
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void trace(const format & f);
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string getName()
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{
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return name;
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}
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ExitCode getExitCode()
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{
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return exitCode;
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}
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/* Callback in case of a timeout. It should wake up its waiters,
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get rid of any running child processes that are being monitored
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by the worker (important!), etc. */
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virtual void timedOut() = 0;
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virtual string key() = 0;
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protected:
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void amDone(ExitCode result);
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};
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bool CompareGoalPtrs::operator() (const GoalPtr & a, const GoalPtr & b) {
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string s1 = a->key();
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string s2 = b->key();
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return s1 < s2;
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}
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typedef std::chrono::time_point<std::chrono::steady_clock> steady_time_point;
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/* A mapping used to remember for each child process to what goal it
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belongs, and file descriptors for receiving log data and output
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path creation commands. */
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struct Child
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{
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WeakGoalPtr goal;
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Goal * goal2; // ugly hackery
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set<int> fds;
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bool respectTimeouts;
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bool inBuildSlot;
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steady_time_point lastOutput; /* time we last got output on stdout/stderr */
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steady_time_point timeStarted;
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};
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/* The worker class. */
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class Worker
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{
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private:
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/* Note: the worker should only have strong pointers to the
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top-level goals. */
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/* The top-level goals of the worker. */
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Goals topGoals;
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/* Goals that are ready to do some work. */
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WeakGoals awake;
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/* Goals waiting for a build slot. */
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WeakGoals wantingToBuild;
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/* Child processes currently running. */
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std::list<Child> children;
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/* Number of build slots occupied. This includes local builds and
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substitutions but not remote builds via the build hook. */
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unsigned int nrLocalBuilds;
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/* Maps used to prevent multiple instantiations of a goal for the
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same derivation / path. */
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WeakGoalMap derivationGoals;
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WeakGoalMap substitutionGoals;
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/* Goals waiting for busy paths to be unlocked. */
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WeakGoals waitingForAnyGoal;
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/* Goals sleeping for a few seconds (polling a lock). */
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WeakGoals waitingForAWhile;
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/* Last time the goals in `waitingForAWhile' where woken up. */
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steady_time_point lastWokenUp;
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/* Cache for pathContentsGood(). */
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std::map<Path, bool> pathContentsGoodCache;
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public:
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/* Set if at least one derivation had a BuildError (i.e. permanent
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failure). */
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bool permanentFailure;
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/* Set if at least one derivation had a timeout. */
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bool timedOut;
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LocalStore & store;
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std::shared_ptr<HookInstance> hook;
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Worker(LocalStore & store);
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~Worker();
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/* Make a goal (with caching). */
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GoalPtr makeDerivationGoal(const Path & drvPath, const StringSet & wantedOutputs, BuildMode buildMode = bmNormal);
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std::shared_ptr<DerivationGoal> makeBasicDerivationGoal(const Path & drvPath,
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const BasicDerivation & drv, BuildMode buildMode = bmNormal);
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GoalPtr makeSubstitutionGoal(const Path & storePath, bool repair = false);
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/* Remove a dead goal. */
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void removeGoal(GoalPtr goal);
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/* Wake up a goal (i.e., there is something for it to do). */
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void wakeUp(GoalPtr goal);
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/* Return the number of local build and substitution processes
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currently running (but not remote builds via the build
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hook). */
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unsigned int getNrLocalBuilds();
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/* Registers a running child process. `inBuildSlot' means that
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the process counts towards the jobs limit. */
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void childStarted(GoalPtr goal, const set<int> & fds,
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bool inBuildSlot, bool respectTimeouts);
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/* Unregisters a running child process. `wakeSleepers' should be
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false if there is no sense in waking up goals that are sleeping
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because they can't run yet (e.g., there is no free build slot,
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or the hook would still say `postpone'). */
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void childTerminated(Goal * goal, bool wakeSleepers = true);
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/* Put `goal' to sleep until a build slot becomes available (which
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might be right away). */
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void waitForBuildSlot(GoalPtr goal);
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/* Wait for any goal to finish. Pretty indiscriminate way to
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wait for some resource that some other goal is holding. */
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void waitForAnyGoal(GoalPtr goal);
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/* Wait for a few seconds and then retry this goal. Used when
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waiting for a lock held by another process. This kind of
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polling is inefficient, but POSIX doesn't really provide a way
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to wait for multiple locks in the main select() loop. */
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void waitForAWhile(GoalPtr goal);
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/* Loop until the specified top-level goals have finished. */
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void run(const Goals & topGoals);
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/* Wait for input to become available. */
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void waitForInput();
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unsigned int exitStatus();
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/* Check whether the given valid path exists and has the right
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contents. */
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bool pathContentsGood(const Path & path);
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void markContentsGood(const Path & path);
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};
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//////////////////////////////////////////////////////////////////////
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void addToWeakGoals(WeakGoals & goals, GoalPtr p)
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{
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// FIXME: necessary?
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// FIXME: O(n)
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for (auto & i : goals)
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if (i.lock() == p) return;
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goals.push_back(p);
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}
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void Goal::addWaitee(GoalPtr waitee)
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{
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waitees.insert(waitee);
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addToWeakGoals(waitee->waiters, shared_from_this());
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}
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void Goal::waiteeDone(GoalPtr waitee, ExitCode result)
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{
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assert(waitees.find(waitee) != waitees.end());
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waitees.erase(waitee);
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trace(format("waitee ‘%1%’ done; %2% left") %
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waitee->name % waitees.size());
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if (result == ecFailed || result == ecNoSubstituters || result == ecIncompleteClosure) ++nrFailed;
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if (result == ecNoSubstituters) ++nrNoSubstituters;
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if (result == ecIncompleteClosure) ++nrIncompleteClosure;
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if (waitees.empty() || (result == ecFailed && !settings.keepGoing)) {
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/* If we failed and keepGoing is not set, we remove all
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remaining waitees. */
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for (auto & goal : waitees) {
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WeakGoals waiters2;
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for (auto & j : goal->waiters)
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if (j.lock() != shared_from_this()) waiters2.push_back(j);
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goal->waiters = waiters2;
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}
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waitees.clear();
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worker.wakeUp(shared_from_this());
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}
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}
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void Goal::amDone(ExitCode result)
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{
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trace("done");
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assert(exitCode == ecBusy);
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assert(result == ecSuccess || result == ecFailed || result == ecNoSubstituters || result == ecIncompleteClosure);
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exitCode = result;
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for (auto & i : waiters) {
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GoalPtr goal = i.lock();
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if (goal) goal->waiteeDone(shared_from_this(), result);
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}
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waiters.clear();
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worker.removeGoal(shared_from_this());
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}
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void Goal::trace(const format & f)
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{
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debug(format("%1%: %2%") % name % f);
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}
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//////////////////////////////////////////////////////////////////////
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/* Common initialisation performed in child processes. */
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static void commonChildInit(Pipe & logPipe)
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{
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/* Put the child in a separate session (and thus a separate
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process group) so that it has no controlling terminal (meaning
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that e.g. ssh cannot open /dev/tty) and it doesn't receive
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terminal signals. */
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if (setsid() == -1)
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throw SysError(format("creating a new session"));
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/* Dup the write side of the logger pipe into stderr. */
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if (dup2(logPipe.writeSide.get(), STDERR_FILENO) == -1)
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throw SysError("cannot pipe standard error into log file");
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/* Dup stderr to stdout. */
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if (dup2(STDERR_FILENO, STDOUT_FILENO) == -1)
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throw SysError("cannot dup stderr into stdout");
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/* Reroute stdin to /dev/null. */
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int fdDevNull = open(pathNullDevice.c_str(), O_RDWR);
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if (fdDevNull == -1)
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throw SysError(format("cannot open ‘%1%’") % pathNullDevice);
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if (dup2(fdDevNull, STDIN_FILENO) == -1)
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throw SysError("cannot dup null device into stdin");
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close(fdDevNull);
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}
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//////////////////////////////////////////////////////////////////////
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class UserLock
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{
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private:
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/* POSIX locks suck. If we have a lock on a file, and we open and
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close that file again (without closing the original file
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descriptor), we lose the lock. So we have to be *very* careful
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not to open a lock file on which we are holding a lock. */
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static PathSet lockedPaths; /* !!! not thread-safe */
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Path fnUserLock;
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AutoCloseFD fdUserLock;
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string user;
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uid_t uid = 0;
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gid_t gid = 0;
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std::vector<gid_t> supplementaryGIDs;
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public:
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~UserLock();
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void acquire();
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void release();
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void kill();
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string getUser() { return user; }
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uid_t getUID() { assert(uid); return uid; }
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uid_t getGID() { assert(gid); return gid; }
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std::vector<gid_t> getSupplementaryGIDs() { return supplementaryGIDs; }
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bool enabled() { return uid != 0; }
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};
|
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PathSet UserLock::lockedPaths;
|
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|
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UserLock::~UserLock()
|
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{
|
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release();
|
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}
|
||
|
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|
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void UserLock::acquire()
|
||
{
|
||
assert(uid == 0);
|
||
|
||
assert(settings.buildUsersGroup != "");
|
||
|
||
/* Get the members of the build-users-group. */
|
||
struct group * gr = getgrnam(settings.buildUsersGroup.c_str());
|
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if (!gr)
|
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throw Error(format("the group ‘%1%’ specified in ‘build-users-group’ does not exist")
|
||
% settings.buildUsersGroup);
|
||
gid = gr->gr_gid;
|
||
|
||
/* Copy the result of getgrnam. */
|
||
Strings users;
|
||
for (char * * p = gr->gr_mem; *p; ++p) {
|
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debug(format("found build user ‘%1%’") % *p);
|
||
users.push_back(*p);
|
||
}
|
||
|
||
if (users.empty())
|
||
throw Error(format("the build users group ‘%1%’ has no members")
|
||
% settings.buildUsersGroup);
|
||
|
||
/* Find a user account that isn't currently in use for another
|
||
build. */
|
||
for (auto & i : users) {
|
||
debug(format("trying user ‘%1%’") % i);
|
||
|
||
struct passwd * pw = getpwnam(i.c_str());
|
||
if (!pw)
|
||
throw Error(format("the user ‘%1%’ in the group ‘%2%’ does not exist")
|
||
% i % settings.buildUsersGroup);
|
||
|
||
createDirs(settings.nixStateDir + "/userpool");
|
||
|
||
fnUserLock = (format("%1%/userpool/%2%") % settings.nixStateDir % pw->pw_uid).str();
|
||
|
||
if (lockedPaths.find(fnUserLock) != lockedPaths.end())
|
||
/* We already have a lock on this one. */
|
||
continue;
|
||
|
||
AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0600);
|
||
if (!fd)
|
||
throw SysError(format("opening user lock ‘%1%’") % fnUserLock);
|
||
|
||
if (lockFile(fd.get(), ltWrite, false)) {
|
||
fdUserLock = std::move(fd);
|
||
lockedPaths.insert(fnUserLock);
|
||
user = i;
|
||
uid = pw->pw_uid;
|
||
|
||
/* Sanity check... */
|
||
if (uid == getuid() || uid == geteuid())
|
||
throw Error(format("the Nix user should not be a member of ‘%1%’")
|
||
% settings.buildUsersGroup);
|
||
|
||
#if __linux__
|
||
/* Get the list of supplementary groups of this build user. This
|
||
is usually either empty or contains a group such as "kvm". */
|
||
supplementaryGIDs.resize(10);
|
||
int ngroups = supplementaryGIDs.size();
|
||
int err = getgrouplist(pw->pw_name, pw->pw_gid,
|
||
supplementaryGIDs.data(), &ngroups);
|
||
if (err == -1)
|
||
throw Error(format("failed to get list of supplementary groups for ‘%1%’") % pw->pw_name);
|
||
|
||
supplementaryGIDs.resize(ngroups);
|
||
#endif
|
||
|
||
return;
|
||
}
|
||
}
|
||
|
||
throw Error(format("all build users are currently in use; "
|
||
"consider creating additional users and adding them to the ‘%1%’ group")
|
||
% settings.buildUsersGroup);
|
||
}
|
||
|
||
|
||
void UserLock::release()
|
||
{
|
||
if (uid == 0) return;
|
||
fdUserLock = -1; /* releases lock */
|
||
assert(lockedPaths.find(fnUserLock) != lockedPaths.end());
|
||
lockedPaths.erase(fnUserLock);
|
||
fnUserLock = "";
|
||
uid = 0;
|
||
}
|
||
|
||
|
||
void UserLock::kill()
|
||
{
|
||
assert(enabled());
|
||
killUser(uid);
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
struct HookInstance
|
||
{
|
||
/* Pipes for talking to the build hook. */
|
||
Pipe toHook;
|
||
|
||
/* Pipe for the hook's standard output/error. */
|
||
Pipe fromHook;
|
||
|
||
/* Pipe for the builder's standard output/error. */
|
||
Pipe builderOut;
|
||
|
||
/* The process ID of the hook. */
|
||
Pid pid;
|
||
|
||
HookInstance();
|
||
|
||
~HookInstance();
|
||
};
|
||
|
||
|
||
HookInstance::HookInstance()
|
||
{
|
||
debug("starting build hook");
|
||
|
||
Path buildHook = getEnv("NIX_BUILD_HOOK");
|
||
if (string(buildHook, 0, 1) != "/") buildHook = settings.nixLibexecDir + "/nix/" + buildHook;
|
||
buildHook = canonPath(buildHook);
|
||
|
||
/* Create a pipe to get the output of the child. */
|
||
fromHook.create();
|
||
|
||
/* Create the communication pipes. */
|
||
toHook.create();
|
||
|
||
/* Create a pipe to get the output of the builder. */
|
||
builderOut.create();
|
||
|
||
/* Fork the hook. */
|
||
pid = startProcess([&]() {
|
||
|
||
commonChildInit(fromHook);
|
||
|
||
if (chdir("/") == -1) throw SysError("changing into /");
|
||
|
||
/* Dup the communication pipes. */
|
||
if (dup2(toHook.readSide.get(), STDIN_FILENO) == -1)
|
||
throw SysError("dupping to-hook read side");
|
||
|
||
/* Use fd 4 for the builder's stdout/stderr. */
|
||
if (dup2(builderOut.writeSide.get(), 4) == -1)
|
||
throw SysError("dupping builder's stdout/stderr");
|
||
|
||
Strings args = {
|
||
baseNameOf(buildHook),
|
||
settings.thisSystem,
|
||
(format("%1%") % settings.maxSilentTime).str(),
|
||
(format("%1%") % settings.buildTimeout).str()
|
||
};
|
||
|
||
execv(buildHook.c_str(), stringsToCharPtrs(args).data());
|
||
|
||
throw SysError(format("executing ‘%1%’") % buildHook);
|
||
});
|
||
|
||
pid.setSeparatePG(true);
|
||
fromHook.writeSide = -1;
|
||
toHook.readSide = -1;
|
||
}
|
||
|
||
|
||
HookInstance::~HookInstance()
|
||
{
|
||
try {
|
||
toHook.writeSide = -1;
|
||
pid.kill(true);
|
||
} catch (...) {
|
||
ignoreException();
|
||
}
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
typedef map<std::string, std::string> StringRewrites;
|
||
|
||
|
||
std::string rewriteStrings(std::string s, const StringRewrites & rewrites)
|
||
{
|
||
for (auto & i : rewrites) {
|
||
size_t j = 0;
|
||
while ((j = s.find(i.first, j)) != string::npos)
|
||
s.replace(j, i.first.size(), i.second);
|
||
}
|
||
return s;
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
typedef enum {rpAccept, rpDecline, rpPostpone} HookReply;
|
||
|
||
class SubstitutionGoal;
|
||
|
||
class DerivationGoal : public Goal
|
||
{
|
||
private:
|
||
/* Whether to use an on-disk .drv file. */
|
||
bool useDerivation;
|
||
|
||
/* The path of the derivation. */
|
||
Path drvPath;
|
||
|
||
/* The specific outputs that we need to build. Empty means all of
|
||
them. */
|
||
StringSet wantedOutputs;
|
||
|
||
/* Whether additional wanted outputs have been added. */
|
||
bool needRestart = false;
|
||
|
||
/* Whether to retry substituting the outputs after building the
|
||
inputs. */
|
||
bool retrySubstitution = false;
|
||
|
||
/* The derivation stored at drvPath. */
|
||
std::unique_ptr<BasicDerivation> drv;
|
||
|
||
/* The remainder is state held during the build. */
|
||
|
||
/* Locks on the output paths. */
|
||
PathLocks outputLocks;
|
||
|
||
/* All input paths (that is, the union of FS closures of the
|
||
immediate input paths). */
|
||
PathSet inputPaths;
|
||
|
||
/* Referenceable paths (i.e., input and output paths). */
|
||
PathSet allPaths;
|
||
|
||
/* Outputs that are already valid. If we're repairing, these are
|
||
the outputs that are valid *and* not corrupt. */
|
||
PathSet validPaths;
|
||
|
||
/* Outputs that are corrupt or not valid. */
|
||
PathSet missingPaths;
|
||
|
||
/* User selected for running the builder. */
|
||
UserLock buildUser;
|
||
|
||
/* The process ID of the builder. */
|
||
Pid pid;
|
||
|
||
/* The temporary directory. */
|
||
Path tmpDir;
|
||
|
||
/* The path of the temporary directory in the sandbox. */
|
||
Path tmpDirInSandbox;
|
||
|
||
/* File descriptor for the log file. */
|
||
AutoCloseFD fdLogFile;
|
||
std::shared_ptr<BufferedSink> logFileSink, logSink;
|
||
|
||
/* Number of bytes received from the builder's stdout/stderr. */
|
||
unsigned long logSize;
|
||
|
||
/* The most recent log lines. */
|
||
std::list<std::string> logTail;
|
||
|
||
std::string currentLogLine;
|
||
size_t currentLogLinePos = 0; // to handle carriage return
|
||
|
||
/* Pipe for the builder's standard output/error. */
|
||
Pipe builderOut;
|
||
|
||
/* Pipe for synchronising updates to the builder user namespace. */
|
||
Pipe userNamespaceSync;
|
||
|
||
/* The build hook. */
|
||
std::shared_ptr<HookInstance> hook;
|
||
|
||
/* Whether we're currently doing a chroot build. */
|
||
bool useChroot = false;
|
||
|
||
Path chrootRootDir;
|
||
|
||
/* RAII object to delete the chroot directory. */
|
||
std::shared_ptr<AutoDelete> autoDelChroot;
|
||
|
||
/* Whether this is a fixed-output derivation. */
|
||
bool fixedOutput;
|
||
|
||
/* Whether to run the build in a private network namespace. */
|
||
bool privateNetwork = false;
|
||
|
||
typedef void (DerivationGoal::*GoalState)();
|
||
GoalState state;
|
||
|
||
/* Stuff we need to pass to initChild(). */
|
||
struct ChrootPath {
|
||
Path source;
|
||
bool optional;
|
||
ChrootPath(Path source = "", bool optional = false)
|
||
: source(source), optional(optional)
|
||
{ }
|
||
};
|
||
typedef map<Path, ChrootPath> DirsInChroot; // maps target path to source path
|
||
DirsInChroot dirsInChroot;
|
||
typedef map<string, string> Environment;
|
||
Environment env;
|
||
|
||
#if __APPLE__
|
||
typedef string SandboxProfile;
|
||
SandboxProfile additionalSandboxProfile;
|
||
AutoDelete autoDelSandbox;
|
||
#endif
|
||
|
||
/* Hash rewriting. */
|
||
StringRewrites inputRewrites, outputRewrites;
|
||
typedef map<Path, Path> RedirectedOutputs;
|
||
RedirectedOutputs redirectedOutputs;
|
||
|
||
BuildMode buildMode;
|
||
|
||
/* If we're repairing without a chroot, there may be outputs that
|
||
are valid but corrupt. So we redirect these outputs to
|
||
temporary paths. */
|
||
PathSet redirectedBadOutputs;
|
||
|
||
BuildResult result;
|
||
|
||
/* The current round, if we're building multiple times. */
|
||
unsigned int curRound = 1;
|
||
|
||
unsigned int nrRounds;
|
||
|
||
/* Path registration info from the previous round, if we're
|
||
building multiple times. Since this contains the hash, it
|
||
allows us to compare whether two rounds produced the same
|
||
result. */
|
||
ValidPathInfos prevInfos;
|
||
|
||
const uid_t sandboxUid = 1000;
|
||
const gid_t sandboxGid = 100;
|
||
|
||
public:
|
||
DerivationGoal(const Path & drvPath, const StringSet & wantedOutputs,
|
||
Worker & worker, BuildMode buildMode = bmNormal);
|
||
DerivationGoal(const Path & drvPath, const BasicDerivation & drv,
|
||
Worker & worker, BuildMode buildMode = bmNormal);
|
||
~DerivationGoal();
|
||
|
||
void timedOut() override;
|
||
|
||
string key() override
|
||
{
|
||
/* Ensure that derivations get built in order of their name,
|
||
i.e. a derivation named "aardvark" always comes before
|
||
"baboon". And substitution goals always happen before
|
||
derivation goals (due to "b$"). */
|
||
return "b$" + storePathToName(drvPath) + "$" + drvPath;
|
||
}
|
||
|
||
void work() override;
|
||
|
||
Path getDrvPath()
|
||
{
|
||
return drvPath;
|
||
}
|
||
|
||
/* Add wanted outputs to an already existing derivation goal. */
|
||
void addWantedOutputs(const StringSet & outputs);
|
||
|
||
BuildResult getResult() { return result; }
|
||
|
||
private:
|
||
/* The states. */
|
||
void getDerivation();
|
||
void loadDerivation();
|
||
void haveDerivation();
|
||
void outputsSubstituted();
|
||
void closureRepaired();
|
||
void inputsRealised();
|
||
void tryToBuild();
|
||
void buildDone();
|
||
|
||
/* Is the build hook willing to perform the build? */
|
||
HookReply tryBuildHook();
|
||
|
||
/* Start building a derivation. */
|
||
void startBuilder();
|
||
|
||
/* Run the builder's process. */
|
||
void runChild();
|
||
|
||
friend int childEntry(void *);
|
||
|
||
/* Check that the derivation outputs all exist and register them
|
||
as valid. */
|
||
void registerOutputs();
|
||
|
||
/* Open a log file and a pipe to it. */
|
||
Path openLogFile();
|
||
|
||
/* Close the log file. */
|
||
void closeLogFile();
|
||
|
||
/* Delete the temporary directory, if we have one. */
|
||
void deleteTmpDir(bool force);
|
||
|
||
/* Callback used by the worker to write to the log. */
|
||
void handleChildOutput(int fd, const string & data) override;
|
||
void handleEOF(int fd) override;
|
||
void flushLine();
|
||
|
||
/* Return the set of (in)valid paths. */
|
||
PathSet checkPathValidity(bool returnValid, bool checkHash);
|
||
|
||
/* Abort the goal if `path' failed to build. */
|
||
bool pathFailed(const Path & path);
|
||
|
||
/* Forcibly kill the child process, if any. */
|
||
void killChild();
|
||
|
||
Path addHashRewrite(const Path & path);
|
||
|
||
void repairClosure();
|
||
|
||
void done(BuildResult::Status status, const string & msg = "");
|
||
};
|
||
|
||
|
||
DerivationGoal::DerivationGoal(const Path & drvPath, const StringSet & wantedOutputs,
|
||
Worker & worker, BuildMode buildMode)
|
||
: Goal(worker)
|
||
, useDerivation(true)
|
||
, drvPath(drvPath)
|
||
, wantedOutputs(wantedOutputs)
|
||
, buildMode(buildMode)
|
||
{
|
||
state = &DerivationGoal::getDerivation;
|
||
name = (format("building of ‘%1%’") % drvPath).str();
|
||
trace("created");
|
||
}
|
||
|
||
|
||
DerivationGoal::DerivationGoal(const Path & drvPath, const BasicDerivation & drv,
|
||
Worker & worker, BuildMode buildMode)
|
||
: Goal(worker)
|
||
, useDerivation(false)
|
||
, drvPath(drvPath)
|
||
, buildMode(buildMode)
|
||
{
|
||
this->drv = std::unique_ptr<BasicDerivation>(new BasicDerivation(drv));
|
||
state = &DerivationGoal::haveDerivation;
|
||
name = (format("building of %1%") % showPaths(drv.outputPaths())).str();
|
||
trace("created");
|
||
|
||
/* Prevent the .chroot directory from being
|
||
garbage-collected. (See isActiveTempFile() in gc.cc.) */
|
||
worker.store.addTempRoot(drvPath);
|
||
}
|
||
|
||
|
||
DerivationGoal::~DerivationGoal()
|
||
{
|
||
/* Careful: we should never ever throw an exception from a
|
||
destructor. */
|
||
try { killChild(); } catch (...) { ignoreException(); }
|
||
try { deleteTmpDir(false); } catch (...) { ignoreException(); }
|
||
try { closeLogFile(); } catch (...) { ignoreException(); }
|
||
}
|
||
|
||
|
||
void DerivationGoal::killChild()
|
||
{
|
||
if (pid != -1) {
|
||
worker.childTerminated(this);
|
||
|
||
if (buildUser.enabled()) {
|
||
/* If we're using a build user, then there is a tricky
|
||
race condition: if we kill the build user before the
|
||
child has done its setuid() to the build user uid, then
|
||
it won't be killed, and we'll potentially lock up in
|
||
pid.wait(). So also send a conventional kill to the
|
||
child. */
|
||
::kill(-pid, SIGKILL); /* ignore the result */
|
||
buildUser.kill();
|
||
pid.wait(true);
|
||
} else
|
||
pid.kill();
|
||
|
||
assert(pid == -1);
|
||
}
|
||
|
||
hook.reset();
|
||
}
|
||
|
||
|
||
void DerivationGoal::timedOut()
|
||
{
|
||
killChild();
|
||
done(BuildResult::TimedOut);
|
||
}
|
||
|
||
|
||
void DerivationGoal::work()
|
||
{
|
||
(this->*state)();
|
||
}
|
||
|
||
|
||
void DerivationGoal::addWantedOutputs(const StringSet & outputs)
|
||
{
|
||
/* If we already want all outputs, there is nothing to do. */
|
||
if (wantedOutputs.empty()) return;
|
||
|
||
if (outputs.empty()) {
|
||
wantedOutputs.clear();
|
||
needRestart = true;
|
||
} else
|
||
for (auto & i : outputs)
|
||
if (wantedOutputs.find(i) == wantedOutputs.end()) {
|
||
wantedOutputs.insert(i);
|
||
needRestart = true;
|
||
}
|
||
}
|
||
|
||
|
||
void DerivationGoal::getDerivation()
|
||
{
|
||
trace("init");
|
||
|
||
/* The first thing to do is to make sure that the derivation
|
||
exists. If it doesn't, it may be created through a
|
||
substitute. */
|
||
if (buildMode == bmNormal && worker.store.isValidPath(drvPath)) {
|
||
loadDerivation();
|
||
return;
|
||
}
|
||
|
||
addWaitee(worker.makeSubstitutionGoal(drvPath));
|
||
|
||
state = &DerivationGoal::loadDerivation;
|
||
}
|
||
|
||
|
||
void DerivationGoal::loadDerivation()
|
||
{
|
||
trace("loading derivation");
|
||
|
||
if (nrFailed != 0) {
|
||
printError(format("cannot build missing derivation ‘%1%’") % drvPath);
|
||
done(BuildResult::MiscFailure);
|
||
return;
|
||
}
|
||
|
||
/* `drvPath' should already be a root, but let's be on the safe
|
||
side: if the user forgot to make it a root, we wouldn't want
|
||
things being garbage collected while we're busy. */
|
||
worker.store.addTempRoot(drvPath);
|
||
|
||
assert(worker.store.isValidPath(drvPath));
|
||
|
||
/* Get the derivation. */
|
||
drv = std::unique_ptr<BasicDerivation>(new Derivation(worker.store.derivationFromPath(drvPath)));
|
||
|
||
haveDerivation();
|
||
}
|
||
|
||
|
||
void DerivationGoal::haveDerivation()
|
||
{
|
||
trace("have derivation");
|
||
|
||
for (auto & i : drv->outputs)
|
||
worker.store.addTempRoot(i.second.path);
|
||
|
||
/* Check what outputs paths are not already valid. */
|
||
PathSet invalidOutputs = checkPathValidity(false, buildMode == bmRepair);
|
||
|
||
/* If they are all valid, then we're done. */
|
||
if (invalidOutputs.size() == 0 && buildMode == bmNormal) {
|
||
done(BuildResult::AlreadyValid);
|
||
return;
|
||
}
|
||
|
||
/* Reject doing a hash build of anything other than a fixed-output
|
||
derivation. */
|
||
if (buildMode == bmHash) {
|
||
if (drv->outputs.size() != 1 ||
|
||
drv->outputs.find("out") == drv->outputs.end() ||
|
||
drv->outputs["out"].hashAlgo == "")
|
||
throw Error(format("cannot do a hash build of non-fixed-output derivation ‘%1%’") % drvPath);
|
||
}
|
||
|
||
/* We are first going to try to create the invalid output paths
|
||
through substitutes. If that doesn't work, we'll build
|
||
them. */
|
||
if (settings.useSubstitutes && drv->substitutesAllowed())
|
||
for (auto & i : invalidOutputs)
|
||
addWaitee(worker.makeSubstitutionGoal(i, buildMode == bmRepair));
|
||
|
||
if (waitees.empty()) /* to prevent hang (no wake-up event) */
|
||
outputsSubstituted();
|
||
else
|
||
state = &DerivationGoal::outputsSubstituted;
|
||
}
|
||
|
||
|
||
void DerivationGoal::outputsSubstituted()
|
||
{
|
||
trace("all outputs substituted (maybe)");
|
||
|
||
if (nrFailed > 0 && nrFailed > nrNoSubstituters + nrIncompleteClosure && !settings.tryFallback) {
|
||
done(BuildResult::TransientFailure, (format("some substitutes for the outputs of derivation ‘%1%’ failed (usually happens due to networking issues); try ‘--fallback’ to build derivation from source ") % drvPath).str());
|
||
return;
|
||
}
|
||
|
||
/* If the substitutes form an incomplete closure, then we should
|
||
build the dependencies of this derivation, but after that, we
|
||
can still use the substitutes for this derivation itself. */
|
||
if (nrIncompleteClosure > 0 && !retrySubstitution) retrySubstitution = true;
|
||
|
||
nrFailed = nrNoSubstituters = nrIncompleteClosure = 0;
|
||
|
||
if (needRestart) {
|
||
needRestart = false;
|
||
haveDerivation();
|
||
return;
|
||
}
|
||
|
||
unsigned int nrInvalid = checkPathValidity(false, buildMode == bmRepair).size();
|
||
if (buildMode == bmNormal && nrInvalid == 0) {
|
||
done(BuildResult::Substituted);
|
||
return;
|
||
}
|
||
if (buildMode == bmRepair && nrInvalid == 0) {
|
||
repairClosure();
|
||
return;
|
||
}
|
||
if (buildMode == bmCheck && nrInvalid > 0)
|
||
throw Error(format("some outputs of ‘%1%’ are not valid, so checking is not possible") % drvPath);
|
||
|
||
/* Otherwise, at least one of the output paths could not be
|
||
produced using a substitute. So we have to build instead. */
|
||
|
||
/* Make sure checkPathValidity() from now on checks all
|
||
outputs. */
|
||
wantedOutputs = PathSet();
|
||
|
||
/* The inputs must be built before we can build this goal. */
|
||
if (useDerivation)
|
||
for (auto & i : dynamic_cast<Derivation *>(drv.get())->inputDrvs)
|
||
addWaitee(worker.makeDerivationGoal(i.first, i.second, buildMode == bmRepair ? bmRepair : bmNormal));
|
||
|
||
for (auto & i : drv->inputSrcs) {
|
||
if (worker.store.isValidPath(i)) continue;
|
||
if (!settings.useSubstitutes)
|
||
throw Error(format("dependency of ‘%1%’ of ‘%2%’ does not exist, and substitution is disabled")
|
||
% i % drvPath);
|
||
addWaitee(worker.makeSubstitutionGoal(i));
|
||
}
|
||
|
||
if (waitees.empty()) /* to prevent hang (no wake-up event) */
|
||
inputsRealised();
|
||
else
|
||
state = &DerivationGoal::inputsRealised;
|
||
}
|
||
|
||
|
||
void DerivationGoal::repairClosure()
|
||
{
|
||
/* If we're repairing, we now know that our own outputs are valid.
|
||
Now check whether the other paths in the outputs closure are
|
||
good. If not, then start derivation goals for the derivations
|
||
that produced those outputs. */
|
||
|
||
/* Get the output closure. */
|
||
PathSet outputClosure;
|
||
for (auto & i : drv->outputs) {
|
||
if (!wantOutput(i.first, wantedOutputs)) continue;
|
||
worker.store.computeFSClosure(i.second.path, outputClosure);
|
||
}
|
||
|
||
/* Filter out our own outputs (which we have already checked). */
|
||
for (auto & i : drv->outputs)
|
||
outputClosure.erase(i.second.path);
|
||
|
||
/* Get all dependencies of this derivation so that we know which
|
||
derivation is responsible for which path in the output
|
||
closure. */
|
||
PathSet inputClosure;
|
||
if (useDerivation) worker.store.computeFSClosure(drvPath, inputClosure);
|
||
std::map<Path, Path> outputsToDrv;
|
||
for (auto & i : inputClosure)
|
||
if (isDerivation(i)) {
|
||
Derivation drv = worker.store.derivationFromPath(i);
|
||
for (auto & j : drv.outputs)
|
||
outputsToDrv[j.second.path] = i;
|
||
}
|
||
|
||
/* Check each path (slow!). */
|
||
PathSet broken;
|
||
for (auto & i : outputClosure) {
|
||
if (worker.pathContentsGood(i)) continue;
|
||
printError(format("found corrupted or missing path ‘%1%’ in the output closure of ‘%2%’") % i % drvPath);
|
||
Path drvPath2 = outputsToDrv[i];
|
||
if (drvPath2 == "")
|
||
addWaitee(worker.makeSubstitutionGoal(i, true));
|
||
else
|
||
addWaitee(worker.makeDerivationGoal(drvPath2, PathSet(), bmRepair));
|
||
}
|
||
|
||
if (waitees.empty()) {
|
||
done(BuildResult::AlreadyValid);
|
||
return;
|
||
}
|
||
|
||
state = &DerivationGoal::closureRepaired;
|
||
}
|
||
|
||
|
||
void DerivationGoal::closureRepaired()
|
||
{
|
||
trace("closure repaired");
|
||
if (nrFailed > 0)
|
||
throw Error(format("some paths in the output closure of derivation ‘%1%’ could not be repaired") % drvPath);
|
||
done(BuildResult::AlreadyValid);
|
||
}
|
||
|
||
|
||
void DerivationGoal::inputsRealised()
|
||
{
|
||
trace("all inputs realised");
|
||
|
||
if (nrFailed != 0) {
|
||
if (!useDerivation)
|
||
throw Error(format("some dependencies of ‘%1%’ are missing") % drvPath);
|
||
printError(
|
||
format("cannot build derivation ‘%1%’: %2% dependencies couldn't be built")
|
||
% drvPath % nrFailed);
|
||
done(BuildResult::DependencyFailed);
|
||
return;
|
||
}
|
||
|
||
if (retrySubstitution) {
|
||
haveDerivation();
|
||
return;
|
||
}
|
||
|
||
/* Gather information necessary for computing the closure and/or
|
||
running the build hook. */
|
||
|
||
/* The outputs are referenceable paths. */
|
||
for (auto & i : drv->outputs) {
|
||
debug(format("building path ‘%1%’") % i.second.path);
|
||
allPaths.insert(i.second.path);
|
||
}
|
||
|
||
/* Determine the full set of input paths. */
|
||
|
||
/* First, the input derivations. */
|
||
if (useDerivation)
|
||
for (auto & i : dynamic_cast<Derivation *>(drv.get())->inputDrvs) {
|
||
/* Add the relevant output closures of the input derivation
|
||
`i' as input paths. Only add the closures of output paths
|
||
that are specified as inputs. */
|
||
assert(worker.store.isValidPath(i.first));
|
||
Derivation inDrv = worker.store.derivationFromPath(i.first);
|
||
for (auto & j : i.second)
|
||
if (inDrv.outputs.find(j) != inDrv.outputs.end())
|
||
worker.store.computeFSClosure(inDrv.outputs[j].path, inputPaths);
|
||
else
|
||
throw Error(
|
||
format("derivation ‘%1%’ requires non-existent output ‘%2%’ from input derivation ‘%3%’")
|
||
% drvPath % j % i.first);
|
||
}
|
||
|
||
/* Second, the input sources. */
|
||
worker.store.computeFSClosure(drv->inputSrcs, inputPaths);
|
||
|
||
debug(format("added input paths %1%") % showPaths(inputPaths));
|
||
|
||
allPaths.insert(inputPaths.begin(), inputPaths.end());
|
||
|
||
/* Is this a fixed-output derivation? */
|
||
fixedOutput = true;
|
||
for (auto & i : drv->outputs)
|
||
if (i.second.hash == "") fixedOutput = false;
|
||
|
||
/* Don't repeat fixed-output derivations since they're already
|
||
verified by their output hash.*/
|
||
nrRounds = fixedOutput ? 1 : settings.get("build-repeat", 0) + 1;
|
||
|
||
/* Okay, try to build. Note that here we don't wait for a build
|
||
slot to become available, since we don't need one if there is a
|
||
build hook. */
|
||
state = &DerivationGoal::tryToBuild;
|
||
worker.wakeUp(shared_from_this());
|
||
|
||
result = BuildResult();
|
||
}
|
||
|
||
|
||
void DerivationGoal::tryToBuild()
|
||
{
|
||
trace("trying to build");
|
||
|
||
/* Check for the possibility that some other goal in this process
|
||
has locked the output since we checked in haveDerivation().
|
||
(It can't happen between here and the lockPaths() call below
|
||
because we're not allowing multi-threading.) If so, put this
|
||
goal to sleep until another goal finishes, then try again. */
|
||
for (auto & i : drv->outputs)
|
||
if (pathIsLockedByMe(worker.store.toRealPath(i.second.path))) {
|
||
debug(format("putting derivation ‘%1%’ to sleep because ‘%2%’ is locked by another goal")
|
||
% drvPath % i.second.path);
|
||
worker.waitForAnyGoal(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* Obtain locks on all output paths. The locks are automatically
|
||
released when we exit this function or Nix crashes. If we
|
||
can't acquire the lock, then continue; hopefully some other
|
||
goal can start a build, and if not, the main loop will sleep a
|
||
few seconds and then retry this goal. */
|
||
PathSet lockFiles;
|
||
for (auto & outPath : drv->outputPaths())
|
||
lockFiles.insert(worker.store.toRealPath(outPath));
|
||
|
||
if (!outputLocks.lockPaths(lockFiles, "", false)) {
|
||
worker.waitForAWhile(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* Now check again whether the outputs are valid. This is because
|
||
another process may have started building in parallel. After
|
||
it has finished and released the locks, we can (and should)
|
||
reuse its results. (Strictly speaking the first check can be
|
||
omitted, but that would be less efficient.) Note that since we
|
||
now hold the locks on the output paths, no other process can
|
||
build this derivation, so no further checks are necessary. */
|
||
validPaths = checkPathValidity(true, buildMode == bmRepair);
|
||
if (buildMode != bmCheck && validPaths.size() == drv->outputs.size()) {
|
||
debug(format("skipping build of derivation ‘%1%’, someone beat us to it") % drvPath);
|
||
outputLocks.setDeletion(true);
|
||
done(BuildResult::AlreadyValid);
|
||
return;
|
||
}
|
||
|
||
missingPaths = drv->outputPaths();
|
||
if (buildMode != bmCheck)
|
||
for (auto & i : validPaths) missingPaths.erase(i);
|
||
|
||
/* If any of the outputs already exist but are not valid, delete
|
||
them. */
|
||
for (auto & i : drv->outputs) {
|
||
Path path = i.second.path;
|
||
if (worker.store.isValidPath(path)) continue;
|
||
debug(format("removing invalid path ‘%1%’") % path);
|
||
deletePath(worker.store.toRealPath(path));
|
||
}
|
||
|
||
/* Don't do a remote build if the derivation has the attribute
|
||
`preferLocalBuild' set. Also, check and repair modes are only
|
||
supported for local builds. */
|
||
bool buildLocally = buildMode != bmNormal || drv->willBuildLocally();
|
||
|
||
/* Is the build hook willing to accept this job? */
|
||
if (!buildLocally) {
|
||
switch (tryBuildHook()) {
|
||
case rpAccept:
|
||
/* Yes, it has started doing so. Wait until we get
|
||
EOF from the hook. */
|
||
result.startTime = time(0); // inexact
|
||
state = &DerivationGoal::buildDone;
|
||
return;
|
||
case rpPostpone:
|
||
/* Not now; wait until at least one child finishes or
|
||
the wake-up timeout expires. */
|
||
worker.waitForAWhile(shared_from_this());
|
||
outputLocks.unlock();
|
||
return;
|
||
case rpDecline:
|
||
/* We should do it ourselves. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Make sure that we are allowed to start a build. If this
|
||
derivation prefers to be done locally, do it even if
|
||
maxBuildJobs is 0. */
|
||
unsigned int curBuilds = worker.getNrLocalBuilds();
|
||
if (curBuilds >= settings.maxBuildJobs && !(buildLocally && curBuilds == 0)) {
|
||
worker.waitForBuildSlot(shared_from_this());
|
||
outputLocks.unlock();
|
||
return;
|
||
}
|
||
|
||
try {
|
||
|
||
/* Okay, we have to build. */
|
||
startBuilder();
|
||
|
||
} catch (BuildError & e) {
|
||
printError(e.msg());
|
||
outputLocks.unlock();
|
||
buildUser.release();
|
||
worker.permanentFailure = true;
|
||
done(BuildResult::InputRejected, e.msg());
|
||
return;
|
||
}
|
||
|
||
/* This state will be reached when we get EOF on the child's
|
||
log pipe. */
|
||
state = &DerivationGoal::buildDone;
|
||
}
|
||
|
||
|
||
void replaceValidPath(const Path & storePath, const Path tmpPath)
|
||
{
|
||
/* We can't atomically replace storePath (the original) with
|
||
tmpPath (the replacement), so we have to move it out of the
|
||
way first. We'd better not be interrupted here, because if
|
||
we're repairing (say) Glibc, we end up with a broken system. */
|
||
Path oldPath = (format("%1%.old-%2%-%3%") % storePath % getpid() % rand()).str();
|
||
if (pathExists(storePath))
|
||
rename(storePath.c_str(), oldPath.c_str());
|
||
if (rename(tmpPath.c_str(), storePath.c_str()) == -1)
|
||
throw SysError(format("moving ‘%1%’ to ‘%2%’") % tmpPath % storePath);
|
||
deletePath(oldPath);
|
||
}
|
||
|
||
|
||
MakeError(NotDeterministic, BuildError)
|
||
|
||
|
||
void DerivationGoal::buildDone()
|
||
{
|
||
trace("build done");
|
||
|
||
/* Since we got an EOF on the logger pipe, the builder is presumed
|
||
to have terminated. In fact, the builder could also have
|
||
simply have closed its end of the pipe --- just don't do that
|
||
:-) */
|
||
/* !!! this could block! security problem! solution: kill the
|
||
child */
|
||
int status = hook ? hook->pid.wait(true) : pid.wait(true);
|
||
|
||
debug(format("builder process for ‘%1%’ finished") % drvPath);
|
||
|
||
result.timesBuilt++;
|
||
result.stopTime = time(0);
|
||
|
||
/* So the child is gone now. */
|
||
worker.childTerminated(this);
|
||
|
||
/* Close the read side of the logger pipe. */
|
||
if (hook) {
|
||
hook->builderOut.readSide = -1;
|
||
hook->fromHook.readSide = -1;
|
||
}
|
||
else builderOut.readSide = -1;
|
||
|
||
/* Close the log file. */
|
||
closeLogFile();
|
||
|
||
/* When running under a build user, make sure that all processes
|
||
running under that uid are gone. This is to prevent a
|
||
malicious user from leaving behind a process that keeps files
|
||
open and modifies them after they have been chown'ed to
|
||
root. */
|
||
if (buildUser.enabled()) buildUser.kill();
|
||
|
||
bool diskFull = false;
|
||
|
||
try {
|
||
|
||
/* Check the exit status. */
|
||
if (!statusOk(status)) {
|
||
|
||
/* Heuristically check whether the build failure may have
|
||
been caused by a disk full condition. We have no way
|
||
of knowing whether the build actually got an ENOSPC.
|
||
So instead, check if the disk is (nearly) full now. If
|
||
so, we don't mark this build as a permanent failure. */
|
||
#if HAVE_STATVFS
|
||
unsigned long long required = 8ULL * 1024 * 1024; // FIXME: make configurable
|
||
struct statvfs st;
|
||
if (statvfs(worker.store.realStoreDir.c_str(), &st) == 0 &&
|
||
(unsigned long long) st.f_bavail * st.f_bsize < required)
|
||
diskFull = true;
|
||
if (statvfs(tmpDir.c_str(), &st) == 0 &&
|
||
(unsigned long long) st.f_bavail * st.f_bsize < required)
|
||
diskFull = true;
|
||
#endif
|
||
|
||
deleteTmpDir(false);
|
||
|
||
/* Move paths out of the chroot for easier debugging of
|
||
build failures. */
|
||
if (useChroot && buildMode == bmNormal)
|
||
for (auto & i : missingPaths)
|
||
if (pathExists(chrootRootDir + i))
|
||
rename((chrootRootDir + i).c_str(), i.c_str());
|
||
|
||
std::string msg = (format("builder for ‘%1%’ %2%")
|
||
% drvPath % statusToString(status)).str();
|
||
|
||
if (!settings.verboseBuild && !logTail.empty()) {
|
||
msg += (format("; last %d log lines:") % logTail.size()).str();
|
||
for (auto & line : logTail)
|
||
msg += "\n " + line;
|
||
}
|
||
|
||
if (diskFull)
|
||
msg += "\nnote: build failure may have been caused by lack of free disk space";
|
||
|
||
throw BuildError(msg);
|
||
}
|
||
|
||
/* Compute the FS closure of the outputs and register them as
|
||
being valid. */
|
||
registerOutputs();
|
||
|
||
if (buildMode == bmCheck) {
|
||
done(BuildResult::Built);
|
||
return;
|
||
}
|
||
|
||
/* Delete unused redirected outputs (when doing hash rewriting). */
|
||
for (auto & i : redirectedOutputs)
|
||
deletePath(i.second);
|
||
|
||
/* Delete the chroot (if we were using one). */
|
||
autoDelChroot.reset(); /* this runs the destructor */
|
||
|
||
deleteTmpDir(true);
|
||
|
||
/* Repeat the build if necessary. */
|
||
if (curRound++ < nrRounds) {
|
||
outputLocks.unlock();
|
||
buildUser.release();
|
||
state = &DerivationGoal::tryToBuild;
|
||
worker.wakeUp(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* It is now safe to delete the lock files, since all future
|
||
lockers will see that the output paths are valid; they will
|
||
not create new lock files with the same names as the old
|
||
(unlinked) lock files. */
|
||
outputLocks.setDeletion(true);
|
||
outputLocks.unlock();
|
||
|
||
} catch (BuildError & e) {
|
||
if (!hook)
|
||
printError(e.msg());
|
||
outputLocks.unlock();
|
||
buildUser.release();
|
||
|
||
BuildResult::Status st = BuildResult::MiscFailure;
|
||
|
||
if (hook && WIFEXITED(status) && WEXITSTATUS(status) == 101)
|
||
st = BuildResult::TimedOut;
|
||
|
||
else if (hook && (!WIFEXITED(status) || WEXITSTATUS(status) != 100)) {
|
||
}
|
||
|
||
else {
|
||
st =
|
||
dynamic_cast<NotDeterministic*>(&e) ? BuildResult::NotDeterministic :
|
||
statusOk(status) ? BuildResult::OutputRejected :
|
||
fixedOutput || diskFull ? BuildResult::TransientFailure :
|
||
BuildResult::PermanentFailure;
|
||
}
|
||
|
||
done(st, e.msg());
|
||
return;
|
||
}
|
||
|
||
/* Release the build user, if applicable. */
|
||
buildUser.release();
|
||
|
||
done(BuildResult::Built);
|
||
}
|
||
|
||
|
||
HookReply DerivationGoal::tryBuildHook()
|
||
{
|
||
if (!settings.useBuildHook || getEnv("NIX_BUILD_HOOK") == "" || !useDerivation) return rpDecline;
|
||
|
||
if (!worker.hook)
|
||
worker.hook = std::make_shared<HookInstance>();
|
||
|
||
/* Tell the hook about system features (beyond the system type)
|
||
required from the build machine. (The hook could parse the
|
||
drv file itself, but this is easier.) */
|
||
Strings features = tokenizeString<Strings>(get(drv->env, "requiredSystemFeatures"));
|
||
for (auto & i : features) checkStoreName(i); /* !!! abuse */
|
||
|
||
/* Send the request to the hook. */
|
||
writeLine(worker.hook->toHook.writeSide.get(), (format("%1% %2% %3% %4%")
|
||
% (worker.getNrLocalBuilds() < settings.maxBuildJobs ? "1" : "0")
|
||
% drv->platform % drvPath % concatStringsSep(",", features)).str());
|
||
|
||
/* Read the first line of input, which should be a word indicating
|
||
whether the hook wishes to perform the build. */
|
||
string reply;
|
||
while (true) {
|
||
string s = readLine(worker.hook->fromHook.readSide.get());
|
||
if (string(s, 0, 2) == "# ") {
|
||
reply = string(s, 2);
|
||
break;
|
||
}
|
||
s += "\n";
|
||
writeToStderr(s);
|
||
}
|
||
|
||
debug(format("hook reply is ‘%1%’") % reply);
|
||
|
||
if (reply == "decline" || reply == "postpone")
|
||
return reply == "decline" ? rpDecline : rpPostpone;
|
||
else if (reply != "accept")
|
||
throw Error(format("bad hook reply ‘%1%’") % reply);
|
||
|
||
printMsg(lvlTalkative, format("using hook to build path(s) %1%") % showPaths(missingPaths));
|
||
|
||
hook = worker.hook;
|
||
worker.hook.reset();
|
||
|
||
/* Tell the hook all the inputs that have to be copied to the
|
||
remote system. This unfortunately has to contain the entire
|
||
derivation closure to ensure that the validity invariant holds
|
||
on the remote system. (I.e., it's unfortunate that we have to
|
||
list it since the remote system *probably* already has it.) */
|
||
PathSet allInputs;
|
||
allInputs.insert(inputPaths.begin(), inputPaths.end());
|
||
worker.store.computeFSClosure(drvPath, allInputs);
|
||
|
||
string s;
|
||
for (auto & i : allInputs) { s += i; s += ' '; }
|
||
writeLine(hook->toHook.writeSide.get(), s);
|
||
|
||
/* Tell the hooks the missing outputs that have to be copied back
|
||
from the remote system. */
|
||
s = "";
|
||
for (auto & i : missingPaths) { s += i; s += ' '; }
|
||
writeLine(hook->toHook.writeSide.get(), s);
|
||
|
||
hook->toHook.writeSide = -1;
|
||
|
||
/* Create the log file and pipe. */
|
||
Path logFile = openLogFile();
|
||
|
||
set<int> fds;
|
||
fds.insert(hook->fromHook.readSide.get());
|
||
fds.insert(hook->builderOut.readSide.get());
|
||
worker.childStarted(shared_from_this(), fds, false, false);
|
||
|
||
return rpAccept;
|
||
}
|
||
|
||
|
||
void chmod_(const Path & path, mode_t mode)
|
||
{
|
||
if (chmod(path.c_str(), mode) == -1)
|
||
throw SysError(format("setting permissions on ‘%1%’") % path);
|
||
}
|
||
|
||
|
||
int childEntry(void * arg)
|
||
{
|
||
((DerivationGoal *) arg)->runChild();
|
||
return 1;
|
||
}
|
||
|
||
|
||
void DerivationGoal::startBuilder()
|
||
{
|
||
auto f = format(
|
||
buildMode == bmRepair ? "repairing path(s) %1%" :
|
||
buildMode == bmCheck ? "checking path(s) %1%" :
|
||
nrRounds > 1 ? "building path(s) %1% (round %2%/%3%)" :
|
||
"building path(s) %1%");
|
||
f.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
|
||
printInfo(f % showPaths(missingPaths) % curRound % nrRounds);
|
||
|
||
/* Right platform? */
|
||
if (!drv->canBuildLocally()) {
|
||
throw Error(
|
||
format("a ‘%1%’ is required to build ‘%3%’, but I am a ‘%2%’")
|
||
% drv->platform % settings.thisSystem % drvPath);
|
||
}
|
||
|
||
#if __APPLE__
|
||
additionalSandboxProfile = get(drv->env, "__sandboxProfile");
|
||
#endif
|
||
|
||
/* Are we doing a chroot build? Note that fixed-output
|
||
derivations are never done in a chroot, mainly so that
|
||
functions like fetchurl (which needs a proper /etc/resolv.conf)
|
||
work properly. Purity checking for fixed-output derivations
|
||
is somewhat pointless anyway. */
|
||
{
|
||
string x = settings.get("build-use-sandbox",
|
||
/* deprecated alias */
|
||
settings.get("build-use-chroot", string("false")));
|
||
if (x != "true" && x != "false" && x != "relaxed")
|
||
throw Error("option ‘build-use-sandbox’ must be set to one of ‘true’, ‘false’ or ‘relaxed’");
|
||
if (x == "true") {
|
||
if (get(drv->env, "__noChroot") == "1")
|
||
throw Error(format("derivation ‘%1%’ has ‘__noChroot’ set, "
|
||
"but that's not allowed when ‘build-use-sandbox’ is ‘true’") % drvPath);
|
||
#if __APPLE__
|
||
if (additionalSandboxProfile != "")
|
||
throw Error(format("derivation ‘%1%’ specifies a sandbox profile, "
|
||
"but this is only allowed when ‘build-use-sandbox’ is ‘relaxed’") % drvPath);
|
||
#endif
|
||
useChroot = true;
|
||
}
|
||
else if (x == "false")
|
||
useChroot = false;
|
||
else if (x == "relaxed")
|
||
useChroot = !fixedOutput && get(drv->env, "__noChroot") != "1";
|
||
}
|
||
|
||
if (worker.store.storeDir != worker.store.realStoreDir)
|
||
useChroot = true;
|
||
|
||
/* Construct the environment passed to the builder. */
|
||
env.clear();
|
||
|
||
/* Most shells initialise PATH to some default (/bin:/usr/bin:...) when
|
||
PATH is not set. We don't want this, so we fill it in with some dummy
|
||
value. */
|
||
env["PATH"] = "/path-not-set";
|
||
|
||
/* Set HOME to a non-existing path to prevent certain programs from using
|
||
/etc/passwd (or NIS, or whatever) to locate the home directory (for
|
||
example, wget looks for ~/.wgetrc). I.e., these tools use /etc/passwd
|
||
if HOME is not set, but they will just assume that the settings file
|
||
they are looking for does not exist if HOME is set but points to some
|
||
non-existing path. */
|
||
Path homeDir = "/homeless-shelter";
|
||
env["HOME"] = homeDir;
|
||
|
||
/* Tell the builder where the Nix store is. Usually they
|
||
shouldn't care, but this is useful for purity checking (e.g.,
|
||
the compiler or linker might only want to accept paths to files
|
||
in the store or in the build directory). */
|
||
env["NIX_STORE"] = worker.store.storeDir;
|
||
|
||
/* The maximum number of cores to utilize for parallel building. */
|
||
env["NIX_BUILD_CORES"] = (format("%d") % settings.buildCores).str();
|
||
|
||
/* Create a temporary directory where the build will take
|
||
place. */
|
||
auto drvName = storePathToName(drvPath);
|
||
tmpDir = createTempDir("", "nix-build-" + drvName, false, false, 0700);
|
||
|
||
/* In a sandbox, for determinism, always use the same temporary
|
||
directory. */
|
||
tmpDirInSandbox = useChroot ? canonPath("/tmp", true) + "/nix-build-" + drvName + "-0" : tmpDir;
|
||
|
||
/* Add all bindings specified in the derivation via the
|
||
environments, except those listed in the passAsFile
|
||
attribute. Those are passed as file names pointing to
|
||
temporary files containing the contents. */
|
||
PathSet filesToChown;
|
||
StringSet passAsFile = tokenizeString<StringSet>(get(drv->env, "passAsFile"));
|
||
int fileNr = 0;
|
||
for (auto & i : drv->env) {
|
||
if (passAsFile.find(i.first) == passAsFile.end()) {
|
||
env[i.first] = i.second;
|
||
} else {
|
||
string fn = ".attr-" + std::to_string(fileNr++);
|
||
Path p = tmpDir + "/" + fn;
|
||
writeFile(p, i.second);
|
||
filesToChown.insert(p);
|
||
env[i.first + "Path"] = tmpDirInSandbox + "/" + fn;
|
||
}
|
||
}
|
||
|
||
/* For convenience, set an environment pointing to the top build
|
||
directory. */
|
||
env["NIX_BUILD_TOP"] = tmpDirInSandbox;
|
||
|
||
/* Also set TMPDIR and variants to point to this directory. */
|
||
env["TMPDIR"] = env["TEMPDIR"] = env["TMP"] = env["TEMP"] = tmpDirInSandbox;
|
||
|
||
/* Explicitly set PWD to prevent problems with chroot builds. In
|
||
particular, dietlibc cannot figure out the cwd because the
|
||
inode of the current directory doesn't appear in .. (because
|
||
getdents returns the inode of the mount point). */
|
||
env["PWD"] = tmpDirInSandbox;
|
||
|
||
/* Compatibility hack with Nix <= 0.7: if this is a fixed-output
|
||
derivation, tell the builder, so that for instance `fetchurl'
|
||
can skip checking the output. On older Nixes, this environment
|
||
variable won't be set, so `fetchurl' will do the check. */
|
||
if (fixedOutput) env["NIX_OUTPUT_CHECKED"] = "1";
|
||
|
||
/* *Only* if this is a fixed-output derivation, propagate the
|
||
values of the environment variables specified in the
|
||
`impureEnvVars' attribute to the builder. This allows for
|
||
instance environment variables for proxy configuration such as
|
||
`http_proxy' to be easily passed to downloaders like
|
||
`fetchurl'. Passing such environment variables from the caller
|
||
to the builder is generally impure, but the output of
|
||
fixed-output derivations is by definition pure (since we
|
||
already know the cryptographic hash of the output). */
|
||
if (fixedOutput) {
|
||
Strings varNames = tokenizeString<Strings>(get(drv->env, "impureEnvVars"));
|
||
for (auto & i : varNames) env[i] = getEnv(i);
|
||
}
|
||
|
||
/* Substitute output placeholders with the actual output paths. */
|
||
for (auto & output : drv->outputs)
|
||
inputRewrites[hashPlaceholder(output.first)] = output.second.path;
|
||
|
||
/* The `exportReferencesGraph' feature allows the references graph
|
||
to be passed to a builder. This attribute should be a list of
|
||
pairs [name1 path1 name2 path2 ...]. The references graph of
|
||
each `pathN' will be stored in a text file `nameN' in the
|
||
temporary build directory. The text files have the format used
|
||
by `nix-store --register-validity'. However, the deriver
|
||
fields are left empty. */
|
||
string s = get(drv->env, "exportReferencesGraph");
|
||
Strings ss = tokenizeString<Strings>(s);
|
||
if (ss.size() % 2 != 0)
|
||
throw BuildError(format("odd number of tokens in ‘exportReferencesGraph’: ‘%1%’") % s);
|
||
for (Strings::iterator i = ss.begin(); i != ss.end(); ) {
|
||
string fileName = *i++;
|
||
checkStoreName(fileName); /* !!! abuse of this function */
|
||
|
||
/* Check that the store path is valid. */
|
||
Path storePath = *i++;
|
||
if (!worker.store.isInStore(storePath))
|
||
throw BuildError(format("‘exportReferencesGraph’ contains a non-store path ‘%1%’")
|
||
% storePath);
|
||
storePath = worker.store.toStorePath(storePath);
|
||
if (!worker.store.isValidPath(storePath))
|
||
throw BuildError(format("‘exportReferencesGraph’ contains an invalid path ‘%1%’")
|
||
% storePath);
|
||
|
||
/* If there are derivations in the graph, then include their
|
||
outputs as well. This is useful if you want to do things
|
||
like passing all build-time dependencies of some path to a
|
||
derivation that builds a NixOS DVD image. */
|
||
PathSet paths, paths2;
|
||
worker.store.computeFSClosure(storePath, paths);
|
||
paths2 = paths;
|
||
|
||
for (auto & j : paths2) {
|
||
if (isDerivation(j)) {
|
||
Derivation drv = worker.store.derivationFromPath(j);
|
||
for (auto & k : drv.outputs)
|
||
worker.store.computeFSClosure(k.second.path, paths);
|
||
}
|
||
}
|
||
|
||
/* Write closure info to `fileName'. */
|
||
writeFile(tmpDir + "/" + fileName,
|
||
worker.store.makeValidityRegistration(paths, false, false));
|
||
}
|
||
|
||
|
||
/* If `build-users-group' is not empty, then we have to build as
|
||
one of the members of that group. */
|
||
if (settings.buildUsersGroup != "" && getuid() == 0) {
|
||
buildUser.acquire();
|
||
|
||
/* Make sure that no other processes are executing under this
|
||
uid. */
|
||
buildUser.kill();
|
||
|
||
/* Change ownership of the temporary build directory. */
|
||
filesToChown.insert(tmpDir);
|
||
|
||
for (auto & p : filesToChown)
|
||
if (chown(p.c_str(), buildUser.getUID(), buildUser.getGID()) == -1)
|
||
throw SysError(format("cannot change ownership of ‘%1%’") % p);
|
||
}
|
||
|
||
|
||
if (useChroot) {
|
||
|
||
string defaultChrootDirs;
|
||
#if __linux__
|
||
if (worker.store.isInStore(BASH_PATH))
|
||
defaultChrootDirs = "/bin/sh=" BASH_PATH;
|
||
#endif
|
||
|
||
/* Allow a user-configurable set of directories from the
|
||
host file system. */
|
||
PathSet dirs = tokenizeString<StringSet>(
|
||
settings.get("build-sandbox-paths",
|
||
/* deprecated alias with lower priority */
|
||
settings.get("build-chroot-dirs", defaultChrootDirs)));
|
||
PathSet dirs2 = tokenizeString<StringSet>(
|
||
settings.get("build-extra-chroot-dirs",
|
||
settings.get("build-extra-sandbox-paths", string(""))));
|
||
dirs.insert(dirs2.begin(), dirs2.end());
|
||
|
||
dirsInChroot.clear();
|
||
|
||
for (auto i : dirs) {
|
||
if (i.empty()) continue;
|
||
bool optional = false;
|
||
if (i[i.size() - 1] == '?') {
|
||
optional = true;
|
||
i.pop_back();
|
||
}
|
||
size_t p = i.find('=');
|
||
if (p == string::npos)
|
||
dirsInChroot[i] = {i, optional};
|
||
else
|
||
dirsInChroot[string(i, 0, p)] = {string(i, p + 1), optional};
|
||
}
|
||
dirsInChroot[tmpDirInSandbox] = tmpDir;
|
||
|
||
/* Add the closure of store paths to the chroot. */
|
||
PathSet closure;
|
||
for (auto & i : dirsInChroot)
|
||
try {
|
||
if (worker.store.isInStore(i.second.source))
|
||
worker.store.computeFSClosure(worker.store.toStorePath(i.second.source), closure);
|
||
} catch (Error & e) {
|
||
throw Error(format("while processing ‘build-sandbox-paths’: %s") % e.what());
|
||
}
|
||
for (auto & i : closure)
|
||
dirsInChroot[i] = i;
|
||
|
||
string allowed = settings.get("allowed-impure-host-deps", string(DEFAULT_ALLOWED_IMPURE_PREFIXES));
|
||
PathSet allowedPaths = tokenizeString<StringSet>(allowed);
|
||
|
||
/* This works like the above, except on a per-derivation level */
|
||
Strings impurePaths = tokenizeString<Strings>(get(drv->env, "__impureHostDeps"));
|
||
|
||
for (auto & i : impurePaths) {
|
||
bool found = false;
|
||
/* Note: we're not resolving symlinks here to prevent
|
||
giving a non-root user info about inaccessible
|
||
files. */
|
||
Path canonI = canonPath(i);
|
||
/* If only we had a trie to do this more efficiently :) luckily, these are generally going to be pretty small */
|
||
for (auto & a : allowedPaths) {
|
||
Path canonA = canonPath(a);
|
||
if (canonI == canonA || isInDir(canonI, canonA)) {
|
||
found = true;
|
||
break;
|
||
}
|
||
}
|
||
if (!found)
|
||
throw Error(format("derivation ‘%1%’ requested impure path ‘%2%’, but it was not in allowed-impure-host-deps (‘%3%’)") % drvPath % i % allowed);
|
||
|
||
dirsInChroot[i] = i;
|
||
}
|
||
|
||
#if __linux__
|
||
/* Create a temporary directory in which we set up the chroot
|
||
environment using bind-mounts. We put it in the Nix store
|
||
to ensure that we can create hard-links to non-directory
|
||
inputs in the fake Nix store in the chroot (see below). */
|
||
chrootRootDir = worker.store.toRealPath(drvPath) + ".chroot";
|
||
deletePath(chrootRootDir);
|
||
|
||
/* Clean up the chroot directory automatically. */
|
||
autoDelChroot = std::make_shared<AutoDelete>(chrootRootDir);
|
||
|
||
printMsg(lvlChatty, format("setting up chroot environment in ‘%1%’") % chrootRootDir);
|
||
|
||
if (mkdir(chrootRootDir.c_str(), 0750) == -1)
|
||
throw SysError(format("cannot create ‘%1%’") % chrootRootDir);
|
||
|
||
if (buildUser.enabled() && chown(chrootRootDir.c_str(), 0, buildUser.getGID()) == -1)
|
||
throw SysError(format("cannot change ownership of ‘%1%’") % chrootRootDir);
|
||
|
||
/* Create a writable /tmp in the chroot. Many builders need
|
||
this. (Of course they should really respect $TMPDIR
|
||
instead.) */
|
||
Path chrootTmpDir = chrootRootDir + "/tmp";
|
||
createDirs(chrootTmpDir);
|
||
chmod_(chrootTmpDir, 01777);
|
||
|
||
/* Create a /etc/passwd with entries for the build user and the
|
||
nobody account. The latter is kind of a hack to support
|
||
Samba-in-QEMU. */
|
||
createDirs(chrootRootDir + "/etc");
|
||
|
||
writeFile(chrootRootDir + "/etc/passwd",
|
||
(format(
|
||
"root:x:0:0:Nix build user:/:/noshell\n"
|
||
"nixbld:x:%1%:%2%:Nix build user:/:/noshell\n"
|
||
"nobody:x:65534:65534:Nobody:/:/noshell\n") % sandboxUid % sandboxGid).str());
|
||
|
||
/* Declare the build user's group so that programs get a consistent
|
||
view of the system (e.g., "id -gn"). */
|
||
writeFile(chrootRootDir + "/etc/group",
|
||
(format(
|
||
"root:x:0:\n"
|
||
"nixbld:!:%1%:\n"
|
||
"nogroup:x:65534:\n") % sandboxGid).str());
|
||
|
||
/* Create /etc/hosts with localhost entry. */
|
||
if (!fixedOutput)
|
||
writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n");
|
||
|
||
/* Make the closure of the inputs available in the chroot,
|
||
rather than the whole Nix store. This prevents any access
|
||
to undeclared dependencies. Directories are bind-mounted,
|
||
while other inputs are hard-linked (since only directories
|
||
can be bind-mounted). !!! As an extra security
|
||
precaution, make the fake Nix store only writable by the
|
||
build user. */
|
||
Path chrootStoreDir = chrootRootDir + worker.store.storeDir;
|
||
createDirs(chrootStoreDir);
|
||
chmod_(chrootStoreDir, 01775);
|
||
|
||
if (buildUser.enabled() && chown(chrootStoreDir.c_str(), 0, buildUser.getGID()) == -1)
|
||
throw SysError(format("cannot change ownership of ‘%1%’") % chrootStoreDir);
|
||
|
||
for (auto & i : inputPaths) {
|
||
Path r = worker.store.toRealPath(i);
|
||
struct stat st;
|
||
if (lstat(r.c_str(), &st))
|
||
throw SysError(format("getting attributes of path ‘%1%’") % i);
|
||
if (S_ISDIR(st.st_mode))
|
||
dirsInChroot[i] = r;
|
||
else {
|
||
Path p = chrootRootDir + i;
|
||
if (link(r.c_str(), p.c_str()) == -1) {
|
||
/* Hard-linking fails if we exceed the maximum
|
||
link count on a file (e.g. 32000 of ext3),
|
||
which is quite possible after a `nix-store
|
||
--optimise'. */
|
||
if (errno != EMLINK)
|
||
throw SysError(format("linking ‘%1%’ to ‘%2%’") % p % i);
|
||
StringSink sink;
|
||
dumpPath(r, sink);
|
||
StringSource source(*sink.s);
|
||
restorePath(p, source);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If we're repairing, checking or rebuilding part of a
|
||
multiple-outputs derivation, it's possible that we're
|
||
rebuilding a path that is in settings.dirsInChroot
|
||
(typically the dependencies of /bin/sh). Throw them
|
||
out. */
|
||
for (auto & i : drv->outputs)
|
||
dirsInChroot.erase(i.second.path);
|
||
|
||
#elif __APPLE__
|
||
/* We don't really have any parent prep work to do (yet?)
|
||
All work happens in the child, instead. */
|
||
#else
|
||
throw Error("sandboxing builds is not supported on this platform");
|
||
#endif
|
||
}
|
||
|
||
else {
|
||
|
||
if (pathExists(homeDir))
|
||
throw Error(format("directory ‘%1%’ exists; please remove it") % homeDir);
|
||
|
||
/* We're not doing a chroot build, but we have some valid
|
||
output paths. Since we can't just overwrite or delete
|
||
them, we have to do hash rewriting: i.e. in the
|
||
environment/arguments passed to the build, we replace the
|
||
hashes of the valid outputs with unique dummy strings;
|
||
after the build, we discard the redirected outputs
|
||
corresponding to the valid outputs, and rewrite the
|
||
contents of the new outputs to replace the dummy strings
|
||
with the actual hashes. */
|
||
if (validPaths.size() > 0)
|
||
for (auto & i : validPaths)
|
||
addHashRewrite(i);
|
||
|
||
/* If we're repairing, then we don't want to delete the
|
||
corrupt outputs in advance. So rewrite them as well. */
|
||
if (buildMode == bmRepair)
|
||
for (auto & i : missingPaths)
|
||
if (worker.store.isValidPath(i) && pathExists(i)) {
|
||
addHashRewrite(i);
|
||
redirectedBadOutputs.insert(i);
|
||
}
|
||
}
|
||
|
||
if (settings.preBuildHook != "") {
|
||
printMsg(lvlChatty, format("executing pre-build hook ‘%1%’")
|
||
% settings.preBuildHook);
|
||
auto args = useChroot ? Strings({drvPath, chrootRootDir}) :
|
||
Strings({ drvPath });
|
||
enum BuildHookState {
|
||
stBegin,
|
||
stExtraChrootDirs
|
||
};
|
||
auto state = stBegin;
|
||
auto lines = runProgram(settings.preBuildHook, false, args);
|
||
auto lastPos = std::string::size_type{0};
|
||
for (auto nlPos = lines.find('\n'); nlPos != string::npos;
|
||
nlPos = lines.find('\n', lastPos)) {
|
||
auto line = std::string{lines, lastPos, nlPos - lastPos};
|
||
lastPos = nlPos + 1;
|
||
if (state == stBegin) {
|
||
if (line == "extra-sandbox-paths" || line == "extra-chroot-dirs") {
|
||
state = stExtraChrootDirs;
|
||
} else {
|
||
throw Error(format("unknown pre-build hook command ‘%1%’")
|
||
% line);
|
||
}
|
||
} else if (state == stExtraChrootDirs) {
|
||
if (line == "") {
|
||
state = stBegin;
|
||
} else {
|
||
auto p = line.find('=');
|
||
if (p == string::npos)
|
||
dirsInChroot[line] = line;
|
||
else
|
||
dirsInChroot[string(line, 0, p)] = string(line, p + 1);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Run the builder. */
|
||
printMsg(lvlChatty, format("executing builder ‘%1%’") % drv->builder);
|
||
|
||
/* Create the log file. */
|
||
Path logFile = openLogFile();
|
||
|
||
/* Create a pipe to get the output of the builder. */
|
||
builderOut.create();
|
||
|
||
result.startTime = time(0);
|
||
|
||
/* Fork a child to build the package. */
|
||
#if __linux__
|
||
if (useChroot) {
|
||
/* Set up private namespaces for the build:
|
||
|
||
- The PID namespace causes the build to start as PID 1.
|
||
Processes outside of the chroot are not visible to those
|
||
on the inside, but processes inside the chroot are
|
||
visible from the outside (though with different PIDs).
|
||
|
||
- The private mount namespace ensures that all the bind
|
||
mounts we do will only show up in this process and its
|
||
children, and will disappear automatically when we're
|
||
done.
|
||
|
||
- The private network namespace ensures that the builder
|
||
cannot talk to the outside world (or vice versa). It
|
||
only has a private loopback interface. (Fixed-output
|
||
derivations are not run in a private network namespace
|
||
to allow functions like fetchurl to work.)
|
||
|
||
- The IPC namespace prevents the builder from communicating
|
||
with outside processes using SysV IPC mechanisms (shared
|
||
memory, message queues, semaphores). It also ensures
|
||
that all IPC objects are destroyed when the builder
|
||
exits.
|
||
|
||
- The UTS namespace ensures that builders see a hostname of
|
||
localhost rather than the actual hostname.
|
||
|
||
We use a helper process to do the clone() to work around
|
||
clone() being broken in multi-threaded programs due to
|
||
at-fork handlers not being run. Note that we use
|
||
CLONE_PARENT to ensure that the real builder is parented to
|
||
us.
|
||
*/
|
||
|
||
if (!fixedOutput)
|
||
privateNetwork = true;
|
||
|
||
userNamespaceSync.create();
|
||
|
||
ProcessOptions options;
|
||
options.allowVfork = false;
|
||
|
||
Pid helper = startProcess([&]() {
|
||
|
||
/* Drop additional groups here because we can't do it
|
||
after we've created the new user namespace. FIXME:
|
||
this means that if we're not root in the parent
|
||
namespace, we can't drop additional groups; they will
|
||
be mapped to nogroup in the child namespace. There does
|
||
not seem to be a workaround for this. (But who can tell
|
||
from reading user_namespaces(7)?)
|
||
See also https://lwn.net/Articles/621612/. */
|
||
if (getuid() == 0 && setgroups(0, 0) == -1)
|
||
throw SysError("setgroups failed");
|
||
|
||
size_t stackSize = 1 * 1024 * 1024;
|
||
char * stack = (char *) mmap(0, stackSize,
|
||
PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
|
||
if (stack == MAP_FAILED) throw SysError("allocating stack");
|
||
|
||
int flags = CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | CLONE_PARENT | SIGCHLD;
|
||
if (privateNetwork)
|
||
flags |= CLONE_NEWNET;
|
||
|
||
pid_t child = clone(childEntry, stack + stackSize, flags, this);
|
||
if (child == -1 && errno == EINVAL)
|
||
/* Fallback for Linux < 2.13 where CLONE_NEWPID and
|
||
CLONE_PARENT are not allowed together. */
|
||
child = clone(childEntry, stack + stackSize, flags & ~CLONE_NEWPID, this);
|
||
if (child == -1) throw SysError("cloning builder process");
|
||
|
||
writeFull(builderOut.writeSide.get(), std::to_string(child) + "\n");
|
||
_exit(0);
|
||
}, options);
|
||
|
||
if (helper.wait(true) != 0)
|
||
throw Error("unable to start build process");
|
||
|
||
userNamespaceSync.readSide = -1;
|
||
|
||
pid_t tmp;
|
||
if (!string2Int<pid_t>(readLine(builderOut.readSide.get()), tmp)) abort();
|
||
pid = tmp;
|
||
|
||
/* Set the UID/GID mapping of the builder's user namespace
|
||
such that the sandbox user maps to the build user, or to
|
||
the calling user (if build users are disabled). */
|
||
uid_t hostUid = buildUser.enabled() ? buildUser.getUID() : getuid();
|
||
uid_t hostGid = buildUser.enabled() ? buildUser.getGID() : getgid();
|
||
|
||
writeFile("/proc/" + std::to_string(pid) + "/uid_map",
|
||
(format("%d %d 1") % sandboxUid % hostUid).str());
|
||
|
||
writeFile("/proc/" + std::to_string(pid) + "/setgroups", "deny");
|
||
|
||
writeFile("/proc/" + std::to_string(pid) + "/gid_map",
|
||
(format("%d %d 1") % sandboxGid % hostGid).str());
|
||
|
||
/* Signal the builder that we've updated its user
|
||
namespace. */
|
||
writeFull(userNamespaceSync.writeSide.get(), "1");
|
||
userNamespaceSync.writeSide = -1;
|
||
|
||
} else
|
||
#endif
|
||
{
|
||
ProcessOptions options;
|
||
options.allowVfork = !buildUser.enabled() && !drv->isBuiltin();
|
||
pid = startProcess([&]() {
|
||
runChild();
|
||
}, options);
|
||
}
|
||
|
||
/* parent */
|
||
pid.setSeparatePG(true);
|
||
builderOut.writeSide = -1;
|
||
worker.childStarted(shared_from_this(), {builderOut.readSide.get()}, true, true);
|
||
|
||
/* Check if setting up the build environment failed. */
|
||
while (true) {
|
||
string msg = readLine(builderOut.readSide.get());
|
||
if (string(msg, 0, 1) == "\1") {
|
||
if (msg.size() == 1) break;
|
||
throw Error(string(msg, 1));
|
||
}
|
||
debug(msg);
|
||
}
|
||
}
|
||
|
||
|
||
void DerivationGoal::runChild()
|
||
{
|
||
/* Warning: in the child we should absolutely not make any SQLite
|
||
calls! */
|
||
|
||
try { /* child */
|
||
|
||
commonChildInit(builderOut);
|
||
|
||
bool setUser = true;
|
||
|
||
#if __linux__
|
||
if (useChroot) {
|
||
|
||
userNamespaceSync.writeSide = -1;
|
||
|
||
if (drainFD(userNamespaceSync.readSide.get()) != "1")
|
||
throw Error("user namespace initialisation failed");
|
||
|
||
userNamespaceSync.readSide = -1;
|
||
|
||
if (privateNetwork) {
|
||
|
||
/* Initialise the loopback interface. */
|
||
AutoCloseFD fd(socket(PF_INET, SOCK_DGRAM, IPPROTO_IP));
|
||
if (!fd) throw SysError("cannot open IP socket");
|
||
|
||
struct ifreq ifr;
|
||
strcpy(ifr.ifr_name, "lo");
|
||
ifr.ifr_flags = IFF_UP | IFF_LOOPBACK | IFF_RUNNING;
|
||
if (ioctl(fd.get(), SIOCSIFFLAGS, &ifr) == -1)
|
||
throw SysError("cannot set loopback interface flags");
|
||
}
|
||
|
||
/* Set the hostname etc. to fixed values. */
|
||
char hostname[] = "localhost";
|
||
if (sethostname(hostname, sizeof(hostname)) == -1)
|
||
throw SysError("cannot set host name");
|
||
char domainname[] = "(none)"; // kernel default
|
||
if (setdomainname(domainname, sizeof(domainname)) == -1)
|
||
throw SysError("cannot set domain name");
|
||
|
||
/* Make all filesystems private. This is necessary
|
||
because subtrees may have been mounted as "shared"
|
||
(MS_SHARED). (Systemd does this, for instance.) Even
|
||
though we have a private mount namespace, mounting
|
||
filesystems on top of a shared subtree still propagates
|
||
outside of the namespace. Making a subtree private is
|
||
local to the namespace, though, so setting MS_PRIVATE
|
||
does not affect the outside world. */
|
||
Strings mounts = tokenizeString<Strings>(readFile("/proc/self/mountinfo", true), "\n");
|
||
for (auto & i : mounts) {
|
||
vector<string> fields = tokenizeString<vector<string> >(i, " ");
|
||
string fs = decodeOctalEscaped(fields.at(4));
|
||
if (mount(0, fs.c_str(), 0, MS_PRIVATE, 0) == -1)
|
||
throw SysError(format("unable to make filesystem ‘%1%’ private") % fs);
|
||
}
|
||
|
||
/* Bind-mount chroot directory to itself, to treat it as a
|
||
different filesystem from /, as needed for pivot_root. */
|
||
if (mount(chrootRootDir.c_str(), chrootRootDir.c_str(), 0, MS_BIND, 0) == -1)
|
||
throw SysError(format("unable to bind mount ‘%1%’") % chrootRootDir);
|
||
|
||
/* Set up a nearly empty /dev, unless the user asked to
|
||
bind-mount the host /dev. */
|
||
Strings ss;
|
||
if (dirsInChroot.find("/dev") == dirsInChroot.end()) {
|
||
createDirs(chrootRootDir + "/dev/shm");
|
||
createDirs(chrootRootDir + "/dev/pts");
|
||
ss.push_back("/dev/full");
|
||
#ifdef __linux__
|
||
if (pathExists("/dev/kvm"))
|
||
ss.push_back("/dev/kvm");
|
||
#endif
|
||
ss.push_back("/dev/null");
|
||
ss.push_back("/dev/random");
|
||
ss.push_back("/dev/tty");
|
||
ss.push_back("/dev/urandom");
|
||
ss.push_back("/dev/zero");
|
||
ss.push_back("/dev/ptmx");
|
||
ss.push_back("/dev/pts");
|
||
createSymlink("/proc/self/fd", chrootRootDir + "/dev/fd");
|
||
createSymlink("/proc/self/fd/0", chrootRootDir + "/dev/stdin");
|
||
createSymlink("/proc/self/fd/1", chrootRootDir + "/dev/stdout");
|
||
createSymlink("/proc/self/fd/2", chrootRootDir + "/dev/stderr");
|
||
}
|
||
|
||
/* Fixed-output derivations typically need to access the
|
||
network, so give them access to /etc/resolv.conf and so
|
||
on. */
|
||
if (fixedOutput) {
|
||
ss.push_back("/etc/resolv.conf");
|
||
ss.push_back("/etc/nsswitch.conf");
|
||
ss.push_back("/etc/services");
|
||
ss.push_back("/etc/hosts");
|
||
ss.push_back("/var/run/nscd/socket");
|
||
}
|
||
|
||
for (auto & i : ss) dirsInChroot[i] = i;
|
||
|
||
/* Bind-mount all the directories from the "host"
|
||
filesystem that we want in the chroot
|
||
environment. */
|
||
for (auto & i : dirsInChroot) {
|
||
struct stat st;
|
||
Path source = i.second.source;
|
||
Path target = chrootRootDir + i.first;
|
||
if (source == "/proc") continue; // backwards compatibility
|
||
debug(format("bind mounting ‘%1%’ to ‘%2%’") % source % target);
|
||
if (stat(source.c_str(), &st) == -1) {
|
||
if (i.second.optional && errno == ENOENT)
|
||
continue;
|
||
else
|
||
throw SysError(format("getting attributes of path ‘%1%’") % source);
|
||
}
|
||
if (S_ISDIR(st.st_mode))
|
||
createDirs(target);
|
||
else {
|
||
createDirs(dirOf(target));
|
||
writeFile(target, "");
|
||
}
|
||
if (mount(source.c_str(), target.c_str(), "", MS_BIND | MS_REC, 0) == -1)
|
||
throw SysError(format("bind mount from ‘%1%’ to ‘%2%’ failed") % source % target);
|
||
}
|
||
|
||
/* Bind a new instance of procfs on /proc. */
|
||
createDirs(chrootRootDir + "/proc");
|
||
if (mount("none", (chrootRootDir + "/proc").c_str(), "proc", 0, 0) == -1)
|
||
throw SysError("mounting /proc");
|
||
|
||
/* Mount a new tmpfs on /dev/shm to ensure that whatever
|
||
the builder puts in /dev/shm is cleaned up automatically. */
|
||
if (pathExists("/dev/shm") && mount("none", (chrootRootDir + "/dev/shm").c_str(), "tmpfs", 0,
|
||
fmt("size=%s", settings.get("sandbox-dev-shm-size", std::string("50%"))).c_str()) == -1)
|
||
throw SysError("mounting /dev/shm");
|
||
|
||
#if 0
|
||
// FIXME: can't figure out how to do this in a user
|
||
// namespace.
|
||
|
||
/* Mount a new devpts on /dev/pts. Note that this
|
||
requires the kernel to be compiled with
|
||
CONFIG_DEVPTS_MULTIPLE_INSTANCES=y (which is the case
|
||
if /dev/ptx/ptmx exists). */
|
||
if (pathExists("/dev/pts/ptmx") &&
|
||
!pathExists(chrootRootDir + "/dev/ptmx")
|
||
&& dirsInChroot.find("/dev/pts") == dirsInChroot.end())
|
||
{
|
||
if (mount("none", (chrootRootDir + "/dev/pts").c_str(), "devpts", 0, "newinstance,mode=0620") == -1)
|
||
throw SysError("mounting /dev/pts");
|
||
createSymlink("/dev/pts/ptmx", chrootRootDir + "/dev/ptmx");
|
||
|
||
/* Make sure /dev/pts/ptmx is world-writable. With some
|
||
Linux versions, it is created with permissions 0. */
|
||
chmod_(chrootRootDir + "/dev/pts/ptmx", 0666);
|
||
}
|
||
#endif
|
||
|
||
/* Do the chroot(). */
|
||
if (chdir(chrootRootDir.c_str()) == -1)
|
||
throw SysError(format("cannot change directory to ‘%1%’") % chrootRootDir);
|
||
|
||
if (mkdir("real-root", 0) == -1)
|
||
throw SysError("cannot create real-root directory");
|
||
|
||
if (pivot_root(".", "real-root") == -1)
|
||
throw SysError(format("cannot pivot old root directory onto ‘%1%’") % (chrootRootDir + "/real-root"));
|
||
|
||
if (chroot(".") == -1)
|
||
throw SysError(format("cannot change root directory to ‘%1%’") % chrootRootDir);
|
||
|
||
if (umount2("real-root", MNT_DETACH) == -1)
|
||
throw SysError("cannot unmount real root filesystem");
|
||
|
||
if (rmdir("real-root") == -1)
|
||
throw SysError("cannot remove real-root directory");
|
||
|
||
/* Switch to the sandbox uid/gid in the user namespace,
|
||
which corresponds to the build user or calling user in
|
||
the parent namespace. */
|
||
if (setgid(sandboxGid) == -1)
|
||
throw SysError("setgid failed");
|
||
if (setuid(sandboxUid) == -1)
|
||
throw SysError("setuid failed");
|
||
|
||
setUser = false;
|
||
}
|
||
#endif
|
||
|
||
if (chdir(tmpDirInSandbox.c_str()) == -1)
|
||
throw SysError(format("changing into ‘%1%’") % tmpDir);
|
||
|
||
/* Close all other file descriptors. */
|
||
closeMostFDs(set<int>());
|
||
|
||
#if __linux__
|
||
/* Change the personality to 32-bit if we're doing an
|
||
i686-linux build on an x86_64-linux machine. */
|
||
struct utsname utsbuf;
|
||
uname(&utsbuf);
|
||
if (drv->platform == "i686-linux" &&
|
||
(settings.thisSystem == "x86_64-linux" ||
|
||
(!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "x86_64")))) {
|
||
if (personality(PER_LINUX32) == -1)
|
||
throw SysError("cannot set i686-linux personality");
|
||
}
|
||
|
||
/* Impersonate a Linux 2.6 machine to get some determinism in
|
||
builds that depend on the kernel version. */
|
||
if ((drv->platform == "i686-linux" || drv->platform == "x86_64-linux") && settings.impersonateLinux26) {
|
||
int cur = personality(0xffffffff);
|
||
if (cur != -1) personality(cur | 0x0020000 /* == UNAME26 */);
|
||
}
|
||
|
||
/* Disable address space randomization for improved
|
||
determinism. */
|
||
int cur = personality(0xffffffff);
|
||
if (cur != -1) personality(cur | ADDR_NO_RANDOMIZE);
|
||
#endif
|
||
|
||
/* Disable core dumps by default. */
|
||
struct rlimit limit = { 0, RLIM_INFINITY };
|
||
setrlimit(RLIMIT_CORE, &limit);
|
||
|
||
// FIXME: set other limits to deterministic values?
|
||
|
||
/* Fill in the environment. */
|
||
Strings envStrs;
|
||
for (auto & i : env)
|
||
envStrs.push_back(rewriteStrings(i.first + "=" + i.second, inputRewrites));
|
||
|
||
/* If we are running in `build-users' mode, then switch to the
|
||
user we allocated above. Make sure that we drop all root
|
||
privileges. Note that above we have closed all file
|
||
descriptors except std*, so that's safe. Also note that
|
||
setuid() when run as root sets the real, effective and
|
||
saved UIDs. */
|
||
if (setUser && buildUser.enabled()) {
|
||
/* Preserve supplementary groups of the build user, to allow
|
||
admins to specify groups such as "kvm". */
|
||
if (!buildUser.getSupplementaryGIDs().empty() &&
|
||
setgroups(buildUser.getSupplementaryGIDs().size(),
|
||
buildUser.getSupplementaryGIDs().data()) == -1)
|
||
throw SysError("cannot set supplementary groups of build user");
|
||
|
||
if (setgid(buildUser.getGID()) == -1 ||
|
||
getgid() != buildUser.getGID() ||
|
||
getegid() != buildUser.getGID())
|
||
throw SysError("setgid failed");
|
||
|
||
if (setuid(buildUser.getUID()) == -1 ||
|
||
getuid() != buildUser.getUID() ||
|
||
geteuid() != buildUser.getUID())
|
||
throw SysError("setuid failed");
|
||
}
|
||
|
||
/* Fill in the arguments. */
|
||
Strings args;
|
||
|
||
const char *builder = "invalid";
|
||
|
||
string sandboxProfile;
|
||
if (drv->isBuiltin()) {
|
||
;
|
||
#if __APPLE__
|
||
} else if (useChroot) {
|
||
/* Lots and lots and lots of file functions freak out if they can't stat their full ancestry */
|
||
PathSet ancestry;
|
||
|
||
/* We build the ancestry before adding all inputPaths to the store because we know they'll
|
||
all have the same parents (the store), and there might be lots of inputs. This isn't
|
||
particularly efficient... I doubt it'll be a bottleneck in practice */
|
||
for (auto & i : dirsInChroot) {
|
||
Path cur = i.first;
|
||
while (cur.compare("/") != 0) {
|
||
cur = dirOf(cur);
|
||
ancestry.insert(cur);
|
||
}
|
||
}
|
||
|
||
/* And we want the store in there regardless of how empty dirsInChroot. We include the innermost
|
||
path component this time, since it's typically /nix/store and we care about that. */
|
||
Path cur = worker.store.storeDir;
|
||
while (cur.compare("/") != 0) {
|
||
ancestry.insert(cur);
|
||
cur = dirOf(cur);
|
||
}
|
||
|
||
/* Add all our input paths to the chroot */
|
||
for (auto & i : inputPaths)
|
||
dirsInChroot[i] = i;
|
||
|
||
/* This has to appear before import statements */
|
||
sandboxProfile += "(version 1)\n";
|
||
|
||
/* Violations will go to the syslog if you set this. Unfortunately the destination does not appear to be configurable */
|
||
if (settings.get("darwin-log-sandbox-violations", false)) {
|
||
sandboxProfile += "(deny default)\n";
|
||
} else {
|
||
sandboxProfile += "(deny default (with no-log))\n";
|
||
}
|
||
|
||
/* The tmpDir in scope points at the temporary build directory for our derivation. Some packages try different mechanisms
|
||
to find temporary directories, so we want to open up a broader place for them to dump their files, if needed. */
|
||
Path globalTmpDir = canonPath(getEnv("TMPDIR", "/tmp"), true);
|
||
|
||
/* They don't like trailing slashes on subpath directives */
|
||
if (globalTmpDir.back() == '/') globalTmpDir.pop_back();
|
||
|
||
/* Our rwx outputs */
|
||
sandboxProfile += "(allow file-read* file-write* process-exec\n";
|
||
for (auto & i : missingPaths) {
|
||
sandboxProfile += (format("\t(subpath \"%1%\")\n") % i.c_str()).str();
|
||
}
|
||
sandboxProfile += ")\n";
|
||
|
||
/* Our inputs (transitive dependencies and any impurities computed above)
|
||
|
||
without file-write* allowed, access() incorrectly returns EPERM
|
||
*/
|
||
sandboxProfile += "(allow file-read* file-write* process-exec\n";
|
||
for (auto & i : dirsInChroot) {
|
||
if (i.first != i.second.source)
|
||
throw Error(format(
|
||
"can't map '%1%' to '%2%': mismatched impure paths not supported on Darwin")
|
||
% i.first % i.second.source);
|
||
|
||
string path = i.first;
|
||
struct stat st;
|
||
if (lstat(path.c_str(), &st)) {
|
||
if (i.second.optional && errno == ENOENT)
|
||
continue;
|
||
throw SysError(format("getting attributes of path ‘%1%’") % path);
|
||
}
|
||
if (S_ISDIR(st.st_mode))
|
||
sandboxProfile += (format("\t(subpath \"%1%\")\n") % path).str();
|
||
else
|
||
sandboxProfile += (format("\t(literal \"%1%\")\n") % path).str();
|
||
}
|
||
sandboxProfile += ")\n";
|
||
|
||
/* Allow file-read* on full directory hierarchy to self. Allows realpath() */
|
||
sandboxProfile += "(allow file-read*\n";
|
||
for (auto & i : ancestry) {
|
||
sandboxProfile += (format("\t(literal \"%1%\")\n") % i.c_str()).str();
|
||
}
|
||
sandboxProfile += ")\n";
|
||
|
||
sandboxProfile += additionalSandboxProfile;
|
||
|
||
debug("Generated sandbox profile:");
|
||
debug(sandboxProfile);
|
||
|
||
Path sandboxFile = drvPath + ".sb";
|
||
deletePath(sandboxFile);
|
||
autoDelSandbox.reset(sandboxFile, false);
|
||
|
||
writeFile(sandboxFile, sandboxProfile);
|
||
|
||
builder = "/usr/bin/sandbox-exec";
|
||
args.push_back("sandbox-exec");
|
||
args.push_back("-f");
|
||
args.push_back(sandboxFile);
|
||
args.push_back("-D");
|
||
args.push_back("_GLOBAL_TMP_DIR=" + globalTmpDir);
|
||
args.push_back(drv->builder);
|
||
#endif
|
||
} else {
|
||
builder = drv->builder.c_str();
|
||
string builderBasename = baseNameOf(drv->builder);
|
||
args.push_back(builderBasename);
|
||
}
|
||
|
||
for (auto & i : drv->args)
|
||
args.push_back(rewriteStrings(i, inputRewrites));
|
||
|
||
restoreSIGPIPE();
|
||
|
||
/* Indicate that we managed to set up the build environment. */
|
||
writeFull(STDERR_FILENO, string("\1\n"));
|
||
|
||
/* Execute the program. This should not return. */
|
||
if (drv->isBuiltin()) {
|
||
try {
|
||
if (drv->builder == "builtin:fetchurl")
|
||
builtinFetchurl(*drv);
|
||
else
|
||
throw Error(format("unsupported builtin function ‘%1%’") % string(drv->builder, 8));
|
||
_exit(0);
|
||
} catch (std::exception & e) {
|
||
writeFull(STDERR_FILENO, "error: " + string(e.what()) + "\n");
|
||
_exit(1);
|
||
}
|
||
}
|
||
|
||
execve(builder, stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
|
||
|
||
throw SysError(format("executing ‘%1%’") % drv->builder);
|
||
|
||
} catch (std::exception & e) {
|
||
writeFull(STDERR_FILENO, "\1while setting up the build environment: " + string(e.what()) + "\n");
|
||
_exit(1);
|
||
}
|
||
}
|
||
|
||
|
||
/* Parse a list of reference specifiers. Each element must either be
|
||
a store path, or the symbolic name of the output of the derivation
|
||
(such as `out'). */
|
||
PathSet parseReferenceSpecifiers(Store & store, const BasicDerivation & drv, string attr)
|
||
{
|
||
PathSet result;
|
||
Paths paths = tokenizeString<Paths>(attr);
|
||
for (auto & i : paths) {
|
||
if (store.isStorePath(i))
|
||
result.insert(i);
|
||
else if (drv.outputs.find(i) != drv.outputs.end())
|
||
result.insert(drv.outputs.find(i)->second.path);
|
||
else throw BuildError(
|
||
format("derivation contains an illegal reference specifier ‘%1%’") % i);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
void DerivationGoal::registerOutputs()
|
||
{
|
||
/* When using a build hook, the build hook can register the output
|
||
as valid (by doing `nix-store --import'). If so we don't have
|
||
to do anything here. */
|
||
if (hook) {
|
||
bool allValid = true;
|
||
for (auto & i : drv->outputs)
|
||
if (!worker.store.isValidPath(i.second.path)) allValid = false;
|
||
if (allValid) return;
|
||
}
|
||
|
||
ValidPathInfos infos;
|
||
|
||
/* Set of inodes seen during calls to canonicalisePathMetaData()
|
||
for this build's outputs. This needs to be shared between
|
||
outputs to allow hard links between outputs. */
|
||
InodesSeen inodesSeen;
|
||
|
||
Path checkSuffix = ".check";
|
||
bool runDiffHook = settings.get("run-diff-hook", false);
|
||
bool keepPreviousRound = settings.keepFailed || runDiffHook;
|
||
|
||
/* Check whether the output paths were created, and grep each
|
||
output path to determine what other paths it references. Also make all
|
||
output paths read-only. */
|
||
for (auto & i : drv->outputs) {
|
||
Path path = i.second.path;
|
||
if (missingPaths.find(path) == missingPaths.end()) continue;
|
||
|
||
Path actualPath = path;
|
||
if (useChroot) {
|
||
actualPath = chrootRootDir + path;
|
||
if (pathExists(actualPath)) {
|
||
/* Move output paths from the chroot to the Nix store. */
|
||
if (buildMode == bmRepair)
|
||
replaceValidPath(path, actualPath);
|
||
else
|
||
if (buildMode != bmCheck && rename(actualPath.c_str(), worker.store.toRealPath(path).c_str()) == -1)
|
||
throw SysError(format("moving build output ‘%1%’ from the sandbox to the Nix store") % path);
|
||
}
|
||
if (buildMode != bmCheck) actualPath = worker.store.toRealPath(path);
|
||
} else {
|
||
Path redirected = redirectedOutputs[path];
|
||
if (buildMode == bmRepair
|
||
&& redirectedBadOutputs.find(path) != redirectedBadOutputs.end()
|
||
&& pathExists(redirected))
|
||
replaceValidPath(path, redirected);
|
||
if (buildMode == bmCheck && redirected != "")
|
||
actualPath = redirected;
|
||
}
|
||
|
||
struct stat st;
|
||
if (lstat(actualPath.c_str(), &st) == -1) {
|
||
if (errno == ENOENT)
|
||
throw BuildError(
|
||
format("builder for ‘%1%’ failed to produce output path ‘%2%’")
|
||
% drvPath % path);
|
||
throw SysError(format("getting attributes of path ‘%1%’") % actualPath);
|
||
}
|
||
|
||
#ifndef __CYGWIN__
|
||
/* Check that the output is not group or world writable, as
|
||
that means that someone else can have interfered with the
|
||
build. Also, the output should be owned by the build
|
||
user. */
|
||
if ((!S_ISLNK(st.st_mode) && (st.st_mode & (S_IWGRP | S_IWOTH))) ||
|
||
(buildUser.enabled() && st.st_uid != buildUser.getUID()))
|
||
throw BuildError(format("suspicious ownership or permission on ‘%1%’; rejecting this build output") % path);
|
||
#endif
|
||
|
||
/* Apply hash rewriting if necessary. */
|
||
bool rewritten = false;
|
||
if (!outputRewrites.empty()) {
|
||
printError(format("warning: rewriting hashes in ‘%1%’; cross fingers") % path);
|
||
|
||
/* Canonicalise first. This ensures that the path we're
|
||
rewriting doesn't contain a hard link to /etc/shadow or
|
||
something like that. */
|
||
canonicalisePathMetaData(actualPath, buildUser.enabled() ? buildUser.getUID() : -1, inodesSeen);
|
||
|
||
/* FIXME: this is in-memory. */
|
||
StringSink sink;
|
||
dumpPath(actualPath, sink);
|
||
deletePath(actualPath);
|
||
sink.s = make_ref<std::string>(rewriteStrings(*sink.s, outputRewrites));
|
||
StringSource source(*sink.s);
|
||
restorePath(actualPath, source);
|
||
|
||
rewritten = true;
|
||
}
|
||
|
||
/* Check that fixed-output derivations produced the right
|
||
outputs (i.e., the content hash should match the specified
|
||
hash). */
|
||
if (i.second.hash != "") {
|
||
|
||
bool recursive; Hash h;
|
||
i.second.parseHashInfo(recursive, h);
|
||
|
||
if (!recursive) {
|
||
/* The output path should be a regular file without
|
||
execute permission. */
|
||
if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
|
||
throw BuildError(
|
||
format("output path ‘%1%’ should be a non-executable regular file") % path);
|
||
}
|
||
|
||
/* Check the hash. In hash mode, move the path produced by
|
||
the derivation to its content-addressed location. */
|
||
Hash h2 = recursive ? hashPath(h.type, actualPath).first : hashFile(h.type, actualPath);
|
||
if (buildMode == bmHash) {
|
||
Path dest = worker.store.makeFixedOutputPath(recursive, h2, drv->env["name"]);
|
||
printError(format("build produced path ‘%1%’ with %2% hash ‘%3%’")
|
||
% dest % printHashType(h.type) % printHash16or32(h2));
|
||
if (worker.store.isValidPath(dest))
|
||
return;
|
||
Path actualDest = worker.store.toRealPath(dest);
|
||
if (actualPath != actualDest) {
|
||
PathLocks outputLocks({actualDest});
|
||
deletePath(actualDest);
|
||
if (rename(actualPath.c_str(), actualDest.c_str()) == -1)
|
||
throw SysError(format("moving ‘%1%’ to ‘%2%’") % actualPath % dest);
|
||
}
|
||
path = dest;
|
||
actualPath = actualDest;
|
||
} else {
|
||
if (h != h2)
|
||
throw BuildError(
|
||
format("output path ‘%1%’ has %2% hash ‘%3%’ when ‘%4%’ was expected")
|
||
% path % i.second.hashAlgo % printHash16or32(h2) % printHash16or32(h));
|
||
}
|
||
}
|
||
|
||
/* Get rid of all weird permissions. This also checks that
|
||
all files are owned by the build user, if applicable. */
|
||
canonicalisePathMetaData(actualPath,
|
||
buildUser.enabled() && !rewritten ? buildUser.getUID() : -1, inodesSeen);
|
||
|
||
/* For this output path, find the references to other paths
|
||
contained in it. Compute the SHA-256 NAR hash at the same
|
||
time. The hash is stored in the database so that we can
|
||
verify later on whether nobody has messed with the store. */
|
||
Activity act(*logger, lvlTalkative, format("scanning for references inside ‘%1%’") % path);
|
||
HashResult hash;
|
||
PathSet references = scanForReferences(actualPath, allPaths, hash);
|
||
|
||
if (buildMode == bmCheck) {
|
||
if (!worker.store.isValidPath(path)) continue;
|
||
auto info = *worker.store.queryPathInfo(path);
|
||
if (hash.first != info.narHash) {
|
||
if (settings.keepFailed) {
|
||
Path dst = worker.store.toRealPath(path + checkSuffix);
|
||
deletePath(dst);
|
||
if (rename(actualPath.c_str(), dst.c_str()))
|
||
throw SysError(format("renaming ‘%1%’ to ‘%2%’") % actualPath % dst);
|
||
throw Error(format("derivation ‘%1%’ may not be deterministic: output ‘%2%’ differs from ‘%3%’")
|
||
% drvPath % path % dst);
|
||
} else
|
||
throw Error(format("derivation ‘%1%’ may not be deterministic: output ‘%2%’ differs")
|
||
% drvPath % path);
|
||
}
|
||
|
||
/* Since we verified the build, it's now ultimately
|
||
trusted. */
|
||
if (!info.ultimate) {
|
||
info.ultimate = true;
|
||
worker.store.signPathInfo(info);
|
||
worker.store.registerValidPaths({info});
|
||
}
|
||
|
||
continue;
|
||
}
|
||
|
||
/* For debugging, print out the referenced and unreferenced
|
||
paths. */
|
||
for (auto & i : inputPaths) {
|
||
PathSet::iterator j = references.find(i);
|
||
if (j == references.end())
|
||
debug(format("unreferenced input: ‘%1%’") % i);
|
||
else
|
||
debug(format("referenced input: ‘%1%’") % i);
|
||
}
|
||
|
||
/* Enforce `allowedReferences' and friends. */
|
||
auto checkRefs = [&](const string & attrName, bool allowed, bool recursive) {
|
||
if (drv->env.find(attrName) == drv->env.end()) return;
|
||
|
||
PathSet spec = parseReferenceSpecifiers(worker.store, *drv, get(drv->env, attrName));
|
||
|
||
PathSet used;
|
||
if (recursive) {
|
||
/* Our requisites are the union of the closures of our references. */
|
||
for (auto & i : references)
|
||
/* Don't call computeFSClosure on ourselves. */
|
||
if (path != i)
|
||
worker.store.computeFSClosure(i, used);
|
||
} else
|
||
used = references;
|
||
|
||
PathSet badPaths;
|
||
|
||
for (auto & i : used)
|
||
if (allowed) {
|
||
if (spec.find(i) == spec.end())
|
||
badPaths.insert(i);
|
||
} else {
|
||
if (spec.find(i) != spec.end())
|
||
badPaths.insert(i);
|
||
}
|
||
|
||
if (!badPaths.empty()) {
|
||
string badPathsStr;
|
||
for (auto & i : badPaths) {
|
||
badPathsStr += "\n\t";
|
||
badPathsStr += i;
|
||
}
|
||
throw BuildError(format("output ‘%1%’ is not allowed to refer to the following paths:%2%") % actualPath % badPathsStr);
|
||
}
|
||
};
|
||
|
||
checkRefs("allowedReferences", true, false);
|
||
checkRefs("allowedRequisites", true, true);
|
||
checkRefs("disallowedReferences", false, false);
|
||
checkRefs("disallowedRequisites", false, true);
|
||
|
||
if (curRound == nrRounds) {
|
||
worker.store.optimisePath(actualPath); // FIXME: combine with scanForReferences()
|
||
worker.markContentsGood(path);
|
||
}
|
||
|
||
ValidPathInfo info;
|
||
info.path = path;
|
||
info.narHash = hash.first;
|
||
info.narSize = hash.second;
|
||
info.references = references;
|
||
info.deriver = drvPath;
|
||
info.ultimate = true;
|
||
worker.store.signPathInfo(info);
|
||
|
||
infos.push_back(info);
|
||
}
|
||
|
||
if (buildMode == bmCheck) return;
|
||
|
||
/* Compare the result with the previous round, and report which
|
||
path is different, if any.*/
|
||
if (curRound > 1 && prevInfos != infos) {
|
||
assert(prevInfos.size() == infos.size());
|
||
for (auto i = prevInfos.begin(), j = infos.begin(); i != prevInfos.end(); ++i, ++j)
|
||
if (!(*i == *j)) {
|
||
result.isNonDeterministic = true;
|
||
Path prev = i->path + checkSuffix;
|
||
bool prevExists = keepPreviousRound && pathExists(prev);
|
||
auto msg = prevExists
|
||
? fmt("output ‘%1%’ of ‘%2%’ differs from ‘%3%’ from previous round", i->path, drvPath, prev)
|
||
: fmt("output ‘%1%’ of ‘%2%’ differs from previous round", i->path, drvPath);
|
||
|
||
auto diffHook = settings.get("diff-hook", std::string(""));
|
||
if (prevExists && diffHook != "" && runDiffHook) {
|
||
try {
|
||
auto diff = runProgram(diffHook, true, {prev, i->path});
|
||
if (diff != "")
|
||
printError(chomp(diff));
|
||
} catch (Error & error) {
|
||
printError("diff hook execution failed: %s", error.what());
|
||
}
|
||
}
|
||
|
||
if (settings.get("enforce-determinism", true))
|
||
throw NotDeterministic(msg);
|
||
|
||
printError(msg);
|
||
curRound = nrRounds; // we know enough, bail out early
|
||
}
|
||
}
|
||
|
||
/* If this is the first round of several, then move the output out
|
||
of the way. */
|
||
if (nrRounds > 1 && curRound == 1 && curRound < nrRounds && keepPreviousRound) {
|
||
for (auto & i : drv->outputs) {
|
||
Path prev = i.second.path + checkSuffix;
|
||
deletePath(prev);
|
||
Path dst = i.second.path + checkSuffix;
|
||
if (rename(i.second.path.c_str(), dst.c_str()))
|
||
throw SysError(format("renaming ‘%1%’ to ‘%2%’") % i.second.path % dst);
|
||
}
|
||
}
|
||
|
||
if (curRound < nrRounds) {
|
||
prevInfos = infos;
|
||
return;
|
||
}
|
||
|
||
/* Remove the .check directories if we're done. FIXME: keep them
|
||
if the result was not determistic? */
|
||
if (curRound == nrRounds) {
|
||
for (auto & i : drv->outputs) {
|
||
Path prev = i.second.path + checkSuffix;
|
||
deletePath(prev);
|
||
}
|
||
}
|
||
|
||
/* Register each output path as valid, and register the sets of
|
||
paths referenced by each of them. If there are cycles in the
|
||
outputs, this will fail. */
|
||
worker.store.registerValidPaths(infos);
|
||
}
|
||
|
||
|
||
string drvsLogDir = "drvs";
|
||
|
||
|
||
Path DerivationGoal::openLogFile()
|
||
{
|
||
logSize = 0;
|
||
|
||
if (!settings.keepLog) return "";
|
||
|
||
string baseName = baseNameOf(drvPath);
|
||
|
||
/* Create a log file. */
|
||
Path dir = (format("%1%/%2%/%3%/") % worker.store.logDir % drvsLogDir % string(baseName, 0, 2)).str();
|
||
createDirs(dir);
|
||
|
||
Path logFileName = (format("%1%/%2%%3%")
|
||
% dir
|
||
% string(baseName, 2)
|
||
% (settings.compressLog ? ".bz2" : "")).str();
|
||
|
||
fdLogFile = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, 0666);
|
||
if (!fdLogFile) throw SysError(format("creating log file ‘%1%’") % logFileName);
|
||
|
||
logFileSink = std::make_shared<FdSink>(fdLogFile.get());
|
||
|
||
if (settings.compressLog)
|
||
logSink = std::shared_ptr<CompressionSink>(makeCompressionSink("bzip2", *logFileSink));
|
||
else
|
||
logSink = logFileSink;
|
||
|
||
return logFileName;
|
||
}
|
||
|
||
|
||
void DerivationGoal::closeLogFile()
|
||
{
|
||
auto logSink2 = std::dynamic_pointer_cast<CompressionSink>(logSink);
|
||
if (logSink2) logSink2->finish();
|
||
if (logFileSink) logFileSink->flush();
|
||
logSink = logFileSink = 0;
|
||
fdLogFile = -1;
|
||
}
|
||
|
||
|
||
void DerivationGoal::deleteTmpDir(bool force)
|
||
{
|
||
if (tmpDir != "") {
|
||
if (settings.keepFailed && !force) {
|
||
printError(
|
||
format("note: keeping build directory ‘%2%’")
|
||
% drvPath % tmpDir);
|
||
chmod(tmpDir.c_str(), 0755);
|
||
}
|
||
else
|
||
deletePath(tmpDir);
|
||
tmpDir = "";
|
||
}
|
||
}
|
||
|
||
|
||
void DerivationGoal::handleChildOutput(int fd, const string & data)
|
||
{
|
||
if ((hook && fd == hook->builderOut.readSide.get()) ||
|
||
(!hook && fd == builderOut.readSide.get()))
|
||
{
|
||
logSize += data.size();
|
||
if (settings.maxLogSize && logSize > settings.maxLogSize) {
|
||
printError(
|
||
format("%1% killed after writing more than %2% bytes of log output")
|
||
% getName() % settings.maxLogSize);
|
||
killChild();
|
||
done(BuildResult::LogLimitExceeded);
|
||
return;
|
||
}
|
||
|
||
for (auto c : data)
|
||
if (c == '\r')
|
||
currentLogLinePos = 0;
|
||
else if (c == '\n')
|
||
flushLine();
|
||
else {
|
||
if (currentLogLinePos >= currentLogLine.size())
|
||
currentLogLine.resize(currentLogLinePos + 1);
|
||
currentLogLine[currentLogLinePos++] = c;
|
||
}
|
||
|
||
if (logSink) (*logSink)(data);
|
||
}
|
||
|
||
if (hook && fd == hook->fromHook.readSide.get())
|
||
printError(data); // FIXME?
|
||
}
|
||
|
||
|
||
void DerivationGoal::handleEOF(int fd)
|
||
{
|
||
if (!currentLogLine.empty()) flushLine();
|
||
worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
void DerivationGoal::flushLine()
|
||
{
|
||
if (settings.verboseBuild &&
|
||
(settings.printRepeatedBuilds || curRound == 1))
|
||
printError(filterANSIEscapes(currentLogLine, true));
|
||
else {
|
||
logTail.push_back(currentLogLine);
|
||
if (logTail.size() > settings.logLines) logTail.pop_front();
|
||
}
|
||
currentLogLine = "";
|
||
currentLogLinePos = 0;
|
||
}
|
||
|
||
|
||
PathSet DerivationGoal::checkPathValidity(bool returnValid, bool checkHash)
|
||
{
|
||
PathSet result;
|
||
for (auto & i : drv->outputs) {
|
||
if (!wantOutput(i.first, wantedOutputs)) continue;
|
||
bool good =
|
||
worker.store.isValidPath(i.second.path) &&
|
||
(!checkHash || worker.pathContentsGood(i.second.path));
|
||
if (good == returnValid) result.insert(i.second.path);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
Path DerivationGoal::addHashRewrite(const Path & path)
|
||
{
|
||
string h1 = string(path, worker.store.storeDir.size() + 1, 32);
|
||
string h2 = string(printHash32(hashString(htSHA256, "rewrite:" + drvPath + ":" + path)), 0, 32);
|
||
Path p = worker.store.storeDir + "/" + h2 + string(path, worker.store.storeDir.size() + 33);
|
||
deletePath(p);
|
||
assert(path.size() == p.size());
|
||
inputRewrites[h1] = h2;
|
||
outputRewrites[h2] = h1;
|
||
redirectedOutputs[path] = p;
|
||
return p;
|
||
}
|
||
|
||
|
||
void DerivationGoal::done(BuildResult::Status status, const string & msg)
|
||
{
|
||
result.status = status;
|
||
result.errorMsg = msg;
|
||
amDone(result.success() ? ecSuccess : ecFailed);
|
||
if (result.status == BuildResult::TimedOut)
|
||
worker.timedOut = true;
|
||
if (result.status == BuildResult::PermanentFailure)
|
||
worker.permanentFailure = true;
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
class SubstitutionGoal : public Goal
|
||
{
|
||
friend class Worker;
|
||
|
||
private:
|
||
/* The store path that should be realised through a substitute. */
|
||
Path storePath;
|
||
|
||
/* The remaining substituters. */
|
||
std::list<ref<Store>> subs;
|
||
|
||
/* The current substituter. */
|
||
std::shared_ptr<Store> sub;
|
||
|
||
/* Whether any substituter can realise this path. */
|
||
bool hasSubstitute;
|
||
|
||
/* Path info returned by the substituter's query info operation. */
|
||
std::shared_ptr<const ValidPathInfo> info;
|
||
|
||
/* Pipe for the substituter's standard output. */
|
||
Pipe outPipe;
|
||
|
||
/* The substituter thread. */
|
||
std::thread thr;
|
||
|
||
std::promise<void> promise;
|
||
|
||
/* Whether to try to repair a valid path. */
|
||
bool repair;
|
||
|
||
/* Location where we're downloading the substitute. Differs from
|
||
storePath when doing a repair. */
|
||
Path destPath;
|
||
|
||
typedef void (SubstitutionGoal::*GoalState)();
|
||
GoalState state;
|
||
|
||
public:
|
||
SubstitutionGoal(const Path & storePath, Worker & worker, bool repair = false);
|
||
~SubstitutionGoal();
|
||
|
||
void timedOut() { abort(); };
|
||
|
||
string key()
|
||
{
|
||
/* "a$" ensures substitution goals happen before derivation
|
||
goals. */
|
||
return "a$" + storePathToName(storePath) + "$" + storePath;
|
||
}
|
||
|
||
void work();
|
||
|
||
/* The states. */
|
||
void init();
|
||
void tryNext();
|
||
void gotInfo();
|
||
void referencesValid();
|
||
void tryToRun();
|
||
void finished();
|
||
|
||
/* Callback used by the worker to write to the log. */
|
||
void handleChildOutput(int fd, const string & data);
|
||
void handleEOF(int fd);
|
||
|
||
Path getStorePath() { return storePath; }
|
||
};
|
||
|
||
|
||
SubstitutionGoal::SubstitutionGoal(const Path & storePath, Worker & worker, bool repair)
|
||
: Goal(worker)
|
||
, hasSubstitute(false)
|
||
, repair(repair)
|
||
{
|
||
this->storePath = storePath;
|
||
state = &SubstitutionGoal::init;
|
||
name = (format("substitution of ‘%1%’") % storePath).str();
|
||
trace("created");
|
||
}
|
||
|
||
|
||
SubstitutionGoal::~SubstitutionGoal()
|
||
{
|
||
try {
|
||
if (thr.joinable()) {
|
||
// FIXME: signal worker thread to quit.
|
||
thr.join();
|
||
worker.childTerminated(this);
|
||
}
|
||
} catch (...) {
|
||
ignoreException();
|
||
}
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::work()
|
||
{
|
||
(this->*state)();
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::init()
|
||
{
|
||
trace("init");
|
||
|
||
worker.store.addTempRoot(storePath);
|
||
|
||
/* If the path already exists we're done. */
|
||
if (!repair && worker.store.isValidPath(storePath)) {
|
||
amDone(ecSuccess);
|
||
return;
|
||
}
|
||
|
||
if (settings.readOnlyMode)
|
||
throw Error(format("cannot substitute path ‘%1%’ - no write access to the Nix store") % storePath);
|
||
|
||
subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
|
||
|
||
tryNext();
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::tryNext()
|
||
{
|
||
trace("trying next substituter");
|
||
|
||
if (subs.size() == 0) {
|
||
/* None left. Terminate this goal and let someone else deal
|
||
with it. */
|
||
debug(format("path ‘%1%’ is required, but there is no substituter that can build it") % storePath);
|
||
|
||
/* Hack: don't indicate failure if there were no substituters.
|
||
In that case the calling derivation should just do a
|
||
build. */
|
||
amDone(hasSubstitute ? ecFailed : ecNoSubstituters);
|
||
return;
|
||
}
|
||
|
||
sub = subs.front();
|
||
subs.pop_front();
|
||
|
||
if (sub->storeDir != worker.store.storeDir) {
|
||
tryNext();
|
||
return;
|
||
}
|
||
|
||
try {
|
||
// FIXME: make async
|
||
info = sub->queryPathInfo(storePath);
|
||
} catch (InvalidPath &) {
|
||
tryNext();
|
||
return;
|
||
}
|
||
|
||
hasSubstitute = true;
|
||
|
||
/* Bail out early if this substituter lacks a valid
|
||
signature. LocalStore::addToStore() also checks for this, but
|
||
only after we've downloaded the path. */
|
||
if (worker.store.requireSigs && !info->checkSignatures(worker.store, worker.store.publicKeys)) {
|
||
printInfo(format("warning: substituter ‘%s’ does not have a valid signature for path ‘%s’")
|
||
% sub->getUri() % storePath);
|
||
tryNext();
|
||
return;
|
||
}
|
||
|
||
/* To maintain the closure invariant, we first have to realise the
|
||
paths referenced by this one. */
|
||
for (auto & i : info->references)
|
||
if (i != storePath) /* ignore self-references */
|
||
addWaitee(worker.makeSubstitutionGoal(i));
|
||
|
||
if (waitees.empty()) /* to prevent hang (no wake-up event) */
|
||
referencesValid();
|
||
else
|
||
state = &SubstitutionGoal::referencesValid;
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::referencesValid()
|
||
{
|
||
trace("all references realised");
|
||
|
||
if (nrFailed > 0) {
|
||
debug(format("some references of path ‘%1%’ could not be realised") % storePath);
|
||
amDone(nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed);
|
||
return;
|
||
}
|
||
|
||
for (auto & i : info->references)
|
||
if (i != storePath) /* ignore self-references */
|
||
assert(worker.store.isValidPath(i));
|
||
|
||
state = &SubstitutionGoal::tryToRun;
|
||
worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::tryToRun()
|
||
{
|
||
trace("trying to run");
|
||
|
||
/* Make sure that we are allowed to start a build. Note that even
|
||
is maxBuildJobs == 0 (no local builds allowed), we still allow
|
||
a substituter to run. This is because substitutions cannot be
|
||
distributed to another machine via the build hook. */
|
||
if (worker.getNrLocalBuilds() >= (settings.maxBuildJobs == 0 ? 1 : settings.maxBuildJobs)) {
|
||
worker.waitForBuildSlot(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
printInfo(format("fetching path ‘%1%’...") % storePath);
|
||
|
||
outPipe.create();
|
||
|
||
promise = std::promise<void>();
|
||
|
||
thr = std::thread([this]() {
|
||
try {
|
||
/* Wake up the worker loop when we're done. */
|
||
Finally updateStats([this]() { outPipe.writeSide = -1; });
|
||
|
||
copyStorePath(ref<Store>(sub), ref<Store>(worker.store.shared_from_this()),
|
||
storePath, repair);
|
||
|
||
promise.set_value();
|
||
} catch (...) {
|
||
promise.set_exception(std::current_exception());
|
||
}
|
||
});
|
||
|
||
worker.childStarted(shared_from_this(), {outPipe.readSide.get()}, true, false);
|
||
|
||
state = &SubstitutionGoal::finished;
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::finished()
|
||
{
|
||
trace("substitute finished");
|
||
|
||
thr.join();
|
||
worker.childTerminated(this);
|
||
|
||
try {
|
||
promise.get_future().get();
|
||
} catch (Error & e) {
|
||
printInfo(e.msg());
|
||
|
||
/* Try the next substitute. */
|
||
state = &SubstitutionGoal::tryNext;
|
||
worker.wakeUp(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
worker.markContentsGood(storePath);
|
||
|
||
printMsg(lvlChatty,
|
||
format("substitution of path ‘%1%’ succeeded") % storePath);
|
||
|
||
amDone(ecSuccess);
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::handleChildOutput(int fd, const string & data)
|
||
{
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::handleEOF(int fd)
|
||
{
|
||
if (fd == outPipe.readSide.get()) worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
static bool working = false;
|
||
|
||
|
||
Worker::Worker(LocalStore & store)
|
||
: store(store)
|
||
{
|
||
/* Debugging: prevent recursive workers. */
|
||
if (working) abort();
|
||
working = true;
|
||
nrLocalBuilds = 0;
|
||
lastWokenUp = steady_time_point::min();
|
||
permanentFailure = false;
|
||
timedOut = false;
|
||
}
|
||
|
||
|
||
Worker::~Worker()
|
||
{
|
||
working = false;
|
||
|
||
/* Explicitly get rid of all strong pointers now. After this all
|
||
goals that refer to this worker should be gone. (Otherwise we
|
||
are in trouble, since goals may call childTerminated() etc. in
|
||
their destructors). */
|
||
topGoals.clear();
|
||
}
|
||
|
||
|
||
GoalPtr Worker::makeDerivationGoal(const Path & path,
|
||
const StringSet & wantedOutputs, BuildMode buildMode)
|
||
{
|
||
GoalPtr goal = derivationGoals[path].lock();
|
||
if (!goal) {
|
||
goal = std::make_shared<DerivationGoal>(path, wantedOutputs, *this, buildMode);
|
||
derivationGoals[path] = goal;
|
||
wakeUp(goal);
|
||
} else
|
||
(dynamic_cast<DerivationGoal *>(goal.get()))->addWantedOutputs(wantedOutputs);
|
||
return goal;
|
||
}
|
||
|
||
|
||
std::shared_ptr<DerivationGoal> Worker::makeBasicDerivationGoal(const Path & drvPath,
|
||
const BasicDerivation & drv, BuildMode buildMode)
|
||
{
|
||
auto goal = std::make_shared<DerivationGoal>(drvPath, drv, *this, buildMode);
|
||
wakeUp(goal);
|
||
return goal;
|
||
}
|
||
|
||
|
||
GoalPtr Worker::makeSubstitutionGoal(const Path & path, bool repair)
|
||
{
|
||
GoalPtr goal = substitutionGoals[path].lock();
|
||
if (!goal) {
|
||
goal = std::make_shared<SubstitutionGoal>(path, *this, repair);
|
||
substitutionGoals[path] = goal;
|
||
wakeUp(goal);
|
||
}
|
||
return goal;
|
||
}
|
||
|
||
|
||
static void removeGoal(GoalPtr goal, WeakGoalMap & goalMap)
|
||
{
|
||
/* !!! inefficient */
|
||
for (WeakGoalMap::iterator i = goalMap.begin();
|
||
i != goalMap.end(); )
|
||
if (i->second.lock() == goal) {
|
||
WeakGoalMap::iterator j = i; ++j;
|
||
goalMap.erase(i);
|
||
i = j;
|
||
}
|
||
else ++i;
|
||
}
|
||
|
||
|
||
void Worker::removeGoal(GoalPtr goal)
|
||
{
|
||
nix::removeGoal(goal, derivationGoals);
|
||
nix::removeGoal(goal, substitutionGoals);
|
||
if (topGoals.find(goal) != topGoals.end()) {
|
||
topGoals.erase(goal);
|
||
/* If a top-level goal failed, then kill all other goals
|
||
(unless keepGoing was set). */
|
||
if (goal->getExitCode() == Goal::ecFailed && !settings.keepGoing)
|
||
topGoals.clear();
|
||
}
|
||
|
||
/* Wake up goals waiting for any goal to finish. */
|
||
for (auto & i : waitingForAnyGoal) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) wakeUp(goal);
|
||
}
|
||
|
||
waitingForAnyGoal.clear();
|
||
}
|
||
|
||
|
||
void Worker::wakeUp(GoalPtr goal)
|
||
{
|
||
goal->trace("woken up");
|
||
addToWeakGoals(awake, goal);
|
||
}
|
||
|
||
|
||
unsigned Worker::getNrLocalBuilds()
|
||
{
|
||
return nrLocalBuilds;
|
||
}
|
||
|
||
|
||
void Worker::childStarted(GoalPtr goal, const set<int> & fds,
|
||
bool inBuildSlot, bool respectTimeouts)
|
||
{
|
||
Child child;
|
||
child.goal = goal;
|
||
child.goal2 = goal.get();
|
||
child.fds = fds;
|
||
child.timeStarted = child.lastOutput = steady_time_point::clock::now();
|
||
child.inBuildSlot = inBuildSlot;
|
||
child.respectTimeouts = respectTimeouts;
|
||
children.emplace_back(child);
|
||
if (inBuildSlot) nrLocalBuilds++;
|
||
}
|
||
|
||
|
||
void Worker::childTerminated(Goal * goal, bool wakeSleepers)
|
||
{
|
||
auto i = std::find_if(children.begin(), children.end(),
|
||
[&](const Child & child) { return child.goal2 == goal; });
|
||
if (i == children.end()) return;
|
||
|
||
if (i->inBuildSlot) {
|
||
assert(nrLocalBuilds > 0);
|
||
nrLocalBuilds--;
|
||
}
|
||
|
||
children.erase(i);
|
||
|
||
if (wakeSleepers) {
|
||
|
||
/* Wake up goals waiting for a build slot. */
|
||
for (auto & j : wantingToBuild) {
|
||
GoalPtr goal = j.lock();
|
||
if (goal) wakeUp(goal);
|
||
}
|
||
|
||
wantingToBuild.clear();
|
||
}
|
||
}
|
||
|
||
|
||
void Worker::waitForBuildSlot(GoalPtr goal)
|
||
{
|
||
debug("wait for build slot");
|
||
if (getNrLocalBuilds() < settings.maxBuildJobs)
|
||
wakeUp(goal); /* we can do it right away */
|
||
else
|
||
addToWeakGoals(wantingToBuild, goal);
|
||
}
|
||
|
||
|
||
void Worker::waitForAnyGoal(GoalPtr goal)
|
||
{
|
||
debug("wait for any goal");
|
||
addToWeakGoals(waitingForAnyGoal, goal);
|
||
}
|
||
|
||
|
||
void Worker::waitForAWhile(GoalPtr goal)
|
||
{
|
||
debug("wait for a while");
|
||
addToWeakGoals(waitingForAWhile, goal);
|
||
}
|
||
|
||
|
||
void Worker::run(const Goals & _topGoals)
|
||
{
|
||
for (auto & i : _topGoals) topGoals.insert(i);
|
||
|
||
Activity act(*logger, lvlDebug, "entered goal loop");
|
||
|
||
while (1) {
|
||
|
||
checkInterrupt();
|
||
|
||
/* Call every wake goal (in the ordering established by
|
||
CompareGoalPtrs). */
|
||
while (!awake.empty() && !topGoals.empty()) {
|
||
Goals awake2;
|
||
for (auto & i : awake) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) awake2.insert(goal);
|
||
}
|
||
awake.clear();
|
||
for (auto & goal : awake2) {
|
||
checkInterrupt();
|
||
goal->work();
|
||
if (topGoals.empty()) break; // stuff may have been cancelled
|
||
}
|
||
}
|
||
|
||
if (topGoals.empty()) break;
|
||
|
||
/* Wait for input. */
|
||
if (!children.empty() || !waitingForAWhile.empty())
|
||
waitForInput();
|
||
else {
|
||
if (awake.empty() && settings.maxBuildJobs == 0) throw Error(
|
||
"unable to start any build; either increase ‘--max-jobs’ "
|
||
"or enable distributed builds");
|
||
assert(!awake.empty());
|
||
}
|
||
}
|
||
|
||
/* If --keep-going is not set, it's possible that the main goal
|
||
exited while some of its subgoals were still active. But if
|
||
--keep-going *is* set, then they must all be finished now. */
|
||
assert(!settings.keepGoing || awake.empty());
|
||
assert(!settings.keepGoing || wantingToBuild.empty());
|
||
assert(!settings.keepGoing || children.empty());
|
||
}
|
||
|
||
|
||
void Worker::waitForInput()
|
||
{
|
||
printMsg(lvlVomit, "waiting for children");
|
||
|
||
/* Process output from the file descriptors attached to the
|
||
children, namely log output and output path creation commands.
|
||
We also use this to detect child termination: if we get EOF on
|
||
the logger pipe of a build, we assume that the builder has
|
||
terminated. */
|
||
|
||
bool useTimeout = false;
|
||
struct timeval timeout;
|
||
timeout.tv_usec = 0;
|
||
auto before = steady_time_point::clock::now();
|
||
|
||
/* If we're monitoring for silence on stdout/stderr, or if there
|
||
is a build timeout, then wait for input until the first
|
||
deadline for any child. */
|
||
auto nearest = steady_time_point::max(); // nearest deadline
|
||
for (auto & i : children) {
|
||
if (!i.respectTimeouts) continue;
|
||
if (settings.maxSilentTime != 0)
|
||
nearest = std::min(nearest, i.lastOutput + std::chrono::seconds(settings.maxSilentTime));
|
||
if (settings.buildTimeout != 0)
|
||
nearest = std::min(nearest, i.timeStarted + std::chrono::seconds(settings.buildTimeout));
|
||
}
|
||
if (nearest != steady_time_point::max()) {
|
||
timeout.tv_sec = std::max(1L, (long) std::chrono::duration_cast<std::chrono::seconds>(nearest - before).count());
|
||
useTimeout = true;
|
||
}
|
||
|
||
/* If we are polling goals that are waiting for a lock, then wake
|
||
up after a few seconds at most. */
|
||
if (!waitingForAWhile.empty()) {
|
||
useTimeout = true;
|
||
if (lastWokenUp == steady_time_point::min())
|
||
printError("waiting for locks or build slots...");
|
||
if (lastWokenUp == steady_time_point::min() || lastWokenUp > before) lastWokenUp = before;
|
||
timeout.tv_sec = std::max(1L,
|
||
(long) std::chrono::duration_cast<std::chrono::seconds>(
|
||
lastWokenUp + std::chrono::seconds(settings.pollInterval) - before).count());
|
||
} else lastWokenUp = steady_time_point::min();
|
||
|
||
if (useTimeout)
|
||
vomit("sleeping %d seconds", timeout.tv_sec);
|
||
|
||
/* Use select() to wait for the input side of any logger pipe to
|
||
become `available'. Note that `available' (i.e., non-blocking)
|
||
includes EOF. */
|
||
fd_set fds;
|
||
FD_ZERO(&fds);
|
||
int fdMax = 0;
|
||
for (auto & i : children) {
|
||
for (auto & j : i.fds) {
|
||
FD_SET(j, &fds);
|
||
if (j >= fdMax) fdMax = j + 1;
|
||
}
|
||
}
|
||
|
||
if (select(fdMax, &fds, 0, 0, useTimeout ? &timeout : 0) == -1) {
|
||
if (errno == EINTR) return;
|
||
throw SysError("waiting for input");
|
||
}
|
||
|
||
auto after = steady_time_point::clock::now();
|
||
|
||
/* Process all available file descriptors. */
|
||
decltype(children)::iterator i;
|
||
for (auto j = children.begin(); j != children.end(); j = i) {
|
||
i = std::next(j);
|
||
|
||
checkInterrupt();
|
||
|
||
GoalPtr goal = j->goal.lock();
|
||
assert(goal);
|
||
|
||
set<int> fds2(j->fds);
|
||
for (auto & k : fds2) {
|
||
if (FD_ISSET(k, &fds)) {
|
||
unsigned char buffer[4096];
|
||
ssize_t rd = read(k, buffer, sizeof(buffer));
|
||
if (rd == -1) {
|
||
if (errno != EINTR)
|
||
throw SysError(format("reading from %1%")
|
||
% goal->getName());
|
||
} else if (rd == 0) {
|
||
debug(format("%1%: got EOF") % goal->getName());
|
||
goal->handleEOF(k);
|
||
j->fds.erase(k);
|
||
} else {
|
||
printMsg(lvlVomit, format("%1%: read %2% bytes")
|
||
% goal->getName() % rd);
|
||
string data((char *) buffer, rd);
|
||
j->lastOutput = after;
|
||
goal->handleChildOutput(k, data);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (goal->getExitCode() == Goal::ecBusy &&
|
||
settings.maxSilentTime != 0 &&
|
||
j->respectTimeouts &&
|
||
after - j->lastOutput >= std::chrono::seconds(settings.maxSilentTime))
|
||
{
|
||
printError(
|
||
format("%1% timed out after %2% seconds of silence")
|
||
% goal->getName() % settings.maxSilentTime);
|
||
goal->timedOut();
|
||
}
|
||
|
||
else if (goal->getExitCode() == Goal::ecBusy &&
|
||
settings.buildTimeout != 0 &&
|
||
j->respectTimeouts &&
|
||
after - j->timeStarted >= std::chrono::seconds(settings.buildTimeout))
|
||
{
|
||
printError(
|
||
format("%1% timed out after %2% seconds")
|
||
% goal->getName() % settings.buildTimeout);
|
||
goal->timedOut();
|
||
}
|
||
}
|
||
|
||
if (!waitingForAWhile.empty() && lastWokenUp + std::chrono::seconds(settings.pollInterval) <= after) {
|
||
lastWokenUp = after;
|
||
for (auto & i : waitingForAWhile) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) wakeUp(goal);
|
||
}
|
||
waitingForAWhile.clear();
|
||
}
|
||
}
|
||
|
||
|
||
unsigned int Worker::exitStatus()
|
||
{
|
||
return timedOut ? 101 : (permanentFailure ? 100 : 1);
|
||
}
|
||
|
||
|
||
bool Worker::pathContentsGood(const Path & path)
|
||
{
|
||
std::map<Path, bool>::iterator i = pathContentsGoodCache.find(path);
|
||
if (i != pathContentsGoodCache.end()) return i->second;
|
||
printInfo(format("checking path ‘%1%’...") % path);
|
||
auto info = store.queryPathInfo(path);
|
||
bool res;
|
||
if (!pathExists(path))
|
||
res = false;
|
||
else {
|
||
HashResult current = hashPath(info->narHash.type, path);
|
||
Hash nullHash(htSHA256);
|
||
res = info->narHash == nullHash || info->narHash == current.first;
|
||
}
|
||
pathContentsGoodCache[path] = res;
|
||
if (!res) printError(format("path ‘%1%’ is corrupted or missing!") % path);
|
||
return res;
|
||
}
|
||
|
||
|
||
void Worker::markContentsGood(const Path & path)
|
||
{
|
||
pathContentsGoodCache[path] = true;
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
void LocalStore::buildPaths(const PathSet & drvPaths, BuildMode buildMode)
|
||
{
|
||
Worker worker(*this);
|
||
|
||
Goals goals;
|
||
for (auto & i : drvPaths) {
|
||
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(i);
|
||
if (isDerivation(i2.first))
|
||
goals.insert(worker.makeDerivationGoal(i2.first, i2.second, buildMode));
|
||
else
|
||
goals.insert(worker.makeSubstitutionGoal(i, buildMode));
|
||
}
|
||
|
||
worker.run(goals);
|
||
|
||
PathSet failed;
|
||
for (auto & i : goals) {
|
||
if (i->getExitCode() != Goal::ecSuccess) {
|
||
DerivationGoal * i2 = dynamic_cast<DerivationGoal *>(i.get());
|
||
if (i2) failed.insert(i2->getDrvPath());
|
||
else failed.insert(dynamic_cast<SubstitutionGoal *>(i.get())->getStorePath());
|
||
}
|
||
}
|
||
|
||
if (!failed.empty())
|
||
throw Error(worker.exitStatus(), "build of %s failed", showPaths(failed));
|
||
}
|
||
|
||
|
||
BuildResult LocalStore::buildDerivation(const Path & drvPath, const BasicDerivation & drv,
|
||
BuildMode buildMode)
|
||
{
|
||
Worker worker(*this);
|
||
auto goal = worker.makeBasicDerivationGoal(drvPath, drv, buildMode);
|
||
|
||
BuildResult result;
|
||
|
||
try {
|
||
worker.run(Goals{goal});
|
||
result = goal->getResult();
|
||
} catch (Error & e) {
|
||
result.status = BuildResult::MiscFailure;
|
||
result.errorMsg = e.msg();
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
|
||
void LocalStore::ensurePath(const Path & path)
|
||
{
|
||
/* If the path is already valid, we're done. */
|
||
if (isValidPath(path)) return;
|
||
|
||
Worker worker(*this);
|
||
GoalPtr goal = worker.makeSubstitutionGoal(path);
|
||
Goals goals = {goal};
|
||
|
||
worker.run(goals);
|
||
|
||
if (goal->getExitCode() != Goal::ecSuccess)
|
||
throw Error(worker.exitStatus(), "path ‘%s’ does not exist and cannot be created", path);
|
||
}
|
||
|
||
|
||
void LocalStore::repairPath(const Path & path)
|
||
{
|
||
Worker worker(*this);
|
||
GoalPtr goal = worker.makeSubstitutionGoal(path, true);
|
||
Goals goals = {goal};
|
||
|
||
worker.run(goals);
|
||
|
||
if (goal->getExitCode() != Goal::ecSuccess) {
|
||
/* Since substituting the path didn't work, if we have a valid
|
||
deriver, then rebuild the deriver. */
|
||
auto deriver = queryPathInfo(path)->deriver;
|
||
if (deriver != "" && isValidPath(deriver)) {
|
||
goals.clear();
|
||
goals.insert(worker.makeDerivationGoal(deriver, StringSet(), bmRepair));
|
||
worker.run(goals);
|
||
} else
|
||
throw Error(worker.exitStatus(), "cannot repair path ‘%s’", path);
|
||
}
|
||
}
|
||
|
||
|
||
}
|