forked from lix-project/lix
16591eb3cc
mount(2) with MS_BIND allows mounting a regular file on top of a regular file, so there's no reason to only bind directories. This allows finer control over just which files are and aren't included in the chroot without having to build symlink trees or the like. Signed-off-by: Shea Levy <shea@shealevy.com>
3350 lines
105 KiB
C++
3350 lines
105 KiB
C++
#include "config.h"
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#include "references.hh"
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#include "pathlocks.hh"
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#include "misc.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 <map>
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#include <sstream>
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#include <algorithm>
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#include <boost/shared_ptr.hpp>
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#include <boost/weak_ptr.hpp>
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#include <boost/enable_shared_from_this.hpp>
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#include <time.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 <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.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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#include <bzlib.h>
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/* Includes required for chroot support. */
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#if HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#if HAVE_SYS_MOUNT_H
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#include <sys/mount.h>
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#endif
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#if HAVE_SCHED_H
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#include <sched.h>
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#endif
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/* In GNU libc 2.11, <sys/mount.h> does not define `MS_PRIVATE', but
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<linux/fs.h> does. */
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#if !defined MS_PRIVATE && defined HAVE_LINUX_FS_H
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#include <linux/fs.h>
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#endif
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#define CHROOT_ENABLED HAVE_CHROOT && HAVE_UNSHARE && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(MS_PRIVATE) && defined(CLONE_NEWNS)
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#if CHROOT_ENABLED
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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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#endif
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#if HAVE_SYS_PERSONALITY_H
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#include <sys/personality.h>
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#define CAN_DO_LINUX32_BUILDS
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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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static const uid_t rootUserId = 0;
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/* Forward definition. */
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class Worker;
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class HookInstance;
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/* A pointer to a goal. */
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class Goal;
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typedef boost::shared_ptr<Goal> GoalPtr;
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typedef boost::weak_ptr<Goal> WeakGoalPtr;
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/* Set of goals. */
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typedef set<GoalPtr> Goals;
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typedef set<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 boost::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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/* Cancel the goal. It should wake up its waiters, get rid of any
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running child processes that are being monitored by the worker
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(important!), etc. */
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virtual void cancel(bool timeout) = 0;
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protected:
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void amDone(ExitCode result);
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};
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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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set<int> fds;
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bool respectTimeouts;
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bool inBuildSlot;
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time_t lastOutput; /* time we last got output on stdout/stderr */
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time_t timeStarted;
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};
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typedef map<pid_t, Child> Children;
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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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Children 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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time_t lastWokenUp;
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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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LocalStore & store;
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boost::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, bool repair = false);
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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, pid_t pid,
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const set<int> & fds, 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(pid_t pid, 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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};
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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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waitee->waiters.insert(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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foreach (Goals::iterator, i, waitees) {
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GoalPtr goal = *i;
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WeakGoals waiters2;
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foreach (WeakGoals::iterator, j, goal->waiters)
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if (j->lock() != shared_from_this()) waiters2.insert(*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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foreach (WeakGoals::iterator, 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, 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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/* Convert a string list to an array of char pointers. Careful: the
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string list should outlive the array. */
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const char * * strings2CharPtrs(const Strings & ss)
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{
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const char * * arr = new const char * [ss.size() + 1];
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const char * * p = arr;
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foreach (Strings::const_iterator, i, ss) *p++ = i->c_str();
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*p = 0;
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return arr;
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}
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/* Restore default handling of SIGPIPE, otherwise some programs will
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randomly say "Broken pipe". */
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static void restoreSIGPIPE()
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{
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struct sigaction act, oact;
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act.sa_handler = SIG_DFL;
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act.sa_flags = 0;
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if (sigaction(SIGPIPE, &act, &oact)) throw SysError("resetting SIGPIPE");
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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;
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gid_t gid;
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public:
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UserLock();
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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() { return uid; }
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uid_t getGID() { return gid; }
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bool enabled() { return uid != 0; }
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};
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PathSet UserLock::lockedPaths;
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UserLock::UserLock()
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{
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uid = gid = 0;
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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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void UserLock::acquire()
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{
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assert(uid == 0);
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assert(settings.buildUsersGroup != "");
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/* Get the members of the build-users-group. */
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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")
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% settings.buildUsersGroup);
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gid = gr->gr_gid;
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/* Copy the result of getgrnam. */
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Strings users;
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for (char * * p = gr->gr_mem; *p; ++p) {
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debug(format("found build user `%1%'") % *p);
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users.push_back(*p);
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}
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if (users.empty())
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throw Error(format("the build users group `%1%' has no members")
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% settings.buildUsersGroup);
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/* Find a user account that isn't currently in use for another
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build. */
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foreach (Strings::iterator, i, users) {
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debug(format("trying user `%1%'") % *i);
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struct passwd * pw = getpwnam(i->c_str());
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if (!pw)
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throw Error(format("the user `%1%' in the group `%2%' does not exist")
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% *i % settings.buildUsersGroup);
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createDirs(settings.nixStateDir + "/userpool");
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fnUserLock = (format("%1%/userpool/%2%") % settings.nixStateDir % pw->pw_uid).str();
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if (lockedPaths.find(fnUserLock) != lockedPaths.end())
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/* We already have a lock on this one. */
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continue;
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AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT, 0600);
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if (fd == -1)
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throw SysError(format("opening user lock `%1%'") % fnUserLock);
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closeOnExec(fd);
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if (lockFile(fd, ltWrite, false)) {
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fdUserLock = fd.borrow();
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lockedPaths.insert(fnUserLock);
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user = *i;
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uid = pw->pw_uid;
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/* Sanity check... */
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if (uid == getuid() || uid == geteuid())
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throw Error(format("the Nix user should not be a member of `%1%'")
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% settings.buildUsersGroup);
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return;
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}
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}
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throw Error(format("all build users are currently in use; "
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"consider creating additional users and adding them to the `%1%' group")
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% settings.buildUsersGroup);
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}
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void UserLock::release()
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{
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if (uid == 0) return;
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fdUserLock.close(); /* releases lock */
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assert(lockedPaths.find(fnUserLock) != lockedPaths.end());
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lockedPaths.erase(fnUserLock);
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fnUserLock = "";
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uid = 0;
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}
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static void runSetuidHelper(const string & command,
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const string & arg)
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{
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Path program = getEnv("NIX_SETUID_HELPER",
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settings.nixLibexecDir + "/nix-setuid-helper");
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/* Fork. */
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Pid pid;
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pid = fork();
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switch (pid) {
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case -1:
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throw SysError("unable to fork");
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case 0: /* child */
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try {
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std::vector<const char *> args; /* careful with c_str()! */
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args.push_back(program.c_str());
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args.push_back(command.c_str());
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args.push_back(arg.c_str());
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args.push_back(0);
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restoreSIGPIPE();
|
|
|
|
execve(program.c_str(), (char * *) &args[0], 0);
|
|
throw SysError(format("executing `%1%'") % program);
|
|
}
|
|
catch (std::exception & e) {
|
|
writeToStderr("error: " + string(e.what()) + "\n");
|
|
}
|
|
_exit(1);
|
|
}
|
|
|
|
/* Parent. */
|
|
|
|
/* Wait for the child to finish. */
|
|
int status = pid.wait(true);
|
|
if (!statusOk(status))
|
|
throw Error(format("program `%1%' %2%")
|
|
% program % statusToString(status));
|
|
}
|
|
|
|
|
|
void UserLock::kill()
|
|
{
|
|
assert(enabled());
|
|
if (amPrivileged())
|
|
killUser(uid);
|
|
else
|
|
runSetuidHelper("kill", user);
|
|
}
|
|
|
|
|
|
bool amPrivileged()
|
|
{
|
|
return geteuid() == 0;
|
|
}
|
|
|
|
|
|
void getOwnership(const Path & path)
|
|
{
|
|
runSetuidHelper("get-ownership", path);
|
|
}
|
|
|
|
|
|
void deletePathWrapped(const Path & path, unsigned long long & bytesFreed)
|
|
{
|
|
try {
|
|
/* First try to delete it ourselves. */
|
|
deletePath(path, bytesFreed);
|
|
} catch (SysError & e) {
|
|
/* If this failed due to a permission error, then try it with
|
|
the setuid helper. */
|
|
if (settings.buildUsersGroup != "" && !amPrivileged()) {
|
|
getOwnership(path);
|
|
deletePath(path, bytesFreed);
|
|
} else
|
|
throw;
|
|
}
|
|
}
|
|
|
|
|
|
void deletePathWrapped(const Path & path)
|
|
{
|
|
unsigned long long dummy1;
|
|
deletePathWrapped(path, dummy1);
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
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 = absPath(getEnv("NIX_BUILD_HOOK"));
|
|
|
|
/* 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 = maybeVfork();
|
|
switch (pid) {
|
|
|
|
case -1:
|
|
throw SysError("unable to fork");
|
|
|
|
case 0:
|
|
try { /* child */
|
|
|
|
commonChildInit(fromHook);
|
|
|
|
if (chdir("/") == -1) throw SysError("changing into `/");
|
|
|
|
/* Dup the communication pipes. */
|
|
if (dup2(toHook.readSide, STDIN_FILENO) == -1)
|
|
throw SysError("dupping to-hook read side");
|
|
|
|
/* Use fd 4 for the builder's stdout/stderr. */
|
|
if (dup2(builderOut.writeSide, 4) == -1)
|
|
throw SysError("dupping builder's stdout/stderr");
|
|
|
|
execl(buildHook.c_str(), buildHook.c_str(), settings.thisSystem.c_str(),
|
|
(format("%1%") % settings.printBuildTrace).str().c_str(),
|
|
NULL);
|
|
|
|
throw SysError(format("executing `%1%'") % buildHook);
|
|
|
|
} catch (std::exception & e) {
|
|
writeToStderr("build hook error: " + string(e.what()) + "\n");
|
|
}
|
|
_exit(1);
|
|
}
|
|
|
|
/* parent */
|
|
pid.setSeparatePG(true);
|
|
pid.setKillSignal(SIGTERM);
|
|
fromHook.writeSide.close();
|
|
toHook.readSide.close();
|
|
}
|
|
|
|
|
|
HookInstance::~HookInstance()
|
|
{
|
|
try {
|
|
pid.kill();
|
|
} catch (...) {
|
|
ignoreException();
|
|
}
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
typedef map<string, string> HashRewrites;
|
|
|
|
|
|
string rewriteHashes(string s, const HashRewrites & rewrites)
|
|
{
|
|
foreach (HashRewrites::const_iterator, i, rewrites) {
|
|
assert(i->first.size() == i->second.size());
|
|
size_t j = 0;
|
|
while ((j = s.find(i->first, j)) != string::npos) {
|
|
debug(format("rewriting @ %1%") % j);
|
|
s.replace(j, i->second.size(), i->second);
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
typedef enum {rpAccept, rpDecline, rpPostpone} HookReply;
|
|
|
|
class SubstitutionGoal;
|
|
|
|
class DerivationGoal : public Goal
|
|
{
|
|
private:
|
|
/* 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;
|
|
|
|
/* Whether to retry substituting the outputs after building the
|
|
inputs. */
|
|
bool retrySubstitution;
|
|
|
|
/* The derivation stored at drvPath. */
|
|
Derivation 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. */
|
|
PathSet validPaths;
|
|
|
|
/* Outputs that are corrupt or not valid. */
|
|
PathSet missingPaths;
|
|
|
|
/* Paths that have been subject to hash rewriting. */
|
|
PathSet rewrittenPaths;
|
|
|
|
/* User selected for running the builder. */
|
|
UserLock buildUser;
|
|
|
|
/* The process ID of the builder. */
|
|
Pid pid;
|
|
|
|
/* The temporary directory. */
|
|
Path tmpDir;
|
|
|
|
/* File descriptor for the log file. */
|
|
FILE * fLogFile;
|
|
BZFILE * bzLogFile;
|
|
AutoCloseFD fdLogFile;
|
|
|
|
/* Pipe for the builder's standard output/error. */
|
|
Pipe builderOut;
|
|
|
|
/* The build hook. */
|
|
boost::shared_ptr<HookInstance> hook;
|
|
|
|
/* Whether we're currently doing a chroot build. */
|
|
bool useChroot;
|
|
|
|
Path chrootRootDir;
|
|
|
|
/* RAII object to delete the chroot directory. */
|
|
boost::shared_ptr<AutoDelete> autoDelChroot;
|
|
|
|
/* All inputs that are regular files. */
|
|
PathSet regularInputPaths;
|
|
|
|
/* Whether this is a fixed-output derivation. */
|
|
bool fixedOutput;
|
|
|
|
typedef void (DerivationGoal::*GoalState)();
|
|
GoalState state;
|
|
|
|
/* Stuff we need to pass to initChild(). */
|
|
typedef map<Path, Path> DirsInChroot; // maps target path to source path
|
|
DirsInChroot dirsInChroot;
|
|
typedef map<string, string> Environment;
|
|
Environment env;
|
|
|
|
/* Hash rewriting. */
|
|
HashRewrites rewritesToTmp, rewritesFromTmp;
|
|
PathSet redirectedOutputs;
|
|
|
|
/* Whether we're repairing. If set, a derivation will be rebuilt
|
|
if its outputs are valid but corrupt or missing. */
|
|
bool repair;
|
|
map<Path, Path> redirectedBadOutputs;
|
|
|
|
/* 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;
|
|
|
|
/* Magic exit code denoting that setting up the child environment
|
|
failed. (It's possible that the child actually returns the
|
|
exit code, but ah well.) */
|
|
const static int childSetupFailed = 189;
|
|
|
|
public:
|
|
DerivationGoal(const Path & drvPath, const StringSet & wantedOutputs, Worker & worker, bool repair = false);
|
|
~DerivationGoal();
|
|
|
|
void cancel(bool timeout);
|
|
|
|
void work();
|
|
|
|
Path getDrvPath()
|
|
{
|
|
return drvPath;
|
|
}
|
|
|
|
/* Add wanted outputs to an already existing derivation goal. */
|
|
void addWantedOutputs(const StringSet & outputs);
|
|
|
|
private:
|
|
/* The states. */
|
|
void init();
|
|
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();
|
|
|
|
/* Initialise the builder's process. */
|
|
void initChild();
|
|
|
|
friend int childEntry(void *);
|
|
|
|
/* Must be called after the output paths have become valid (either
|
|
due to a successful build or hook, or because they already
|
|
were). */
|
|
void computeClosure();
|
|
|
|
/* 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);
|
|
void handleEOF(int fd);
|
|
|
|
/* 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();
|
|
};
|
|
|
|
|
|
DerivationGoal::DerivationGoal(const Path & drvPath, const StringSet & wantedOutputs, Worker & worker, bool repair)
|
|
: Goal(worker)
|
|
, wantedOutputs(wantedOutputs)
|
|
, needRestart(false)
|
|
, retrySubstitution(false)
|
|
, fLogFile(0)
|
|
, bzLogFile(0)
|
|
, useChroot(false)
|
|
, repair(repair)
|
|
{
|
|
this->drvPath = drvPath;
|
|
state = &DerivationGoal::init;
|
|
name = (format("building of `%1%'") % drvPath).str();
|
|
trace("created");
|
|
}
|
|
|
|
|
|
DerivationGoal::~DerivationGoal()
|
|
{
|
|
/* Careful: we should never ever throw an exception from a
|
|
destructor. */
|
|
try {
|
|
killChild();
|
|
deleteTmpDir(false);
|
|
closeLogFile();
|
|
} catch (...) {
|
|
ignoreException();
|
|
}
|
|
}
|
|
|
|
|
|
void DerivationGoal::killChild()
|
|
{
|
|
if (pid != -1) {
|
|
worker.childTerminated(pid);
|
|
|
|
if (buildUser.enabled()) {
|
|
/* We can't use pid.kill(), since we may not have the
|
|
appropriate privilege. I.e., if we're not root, then
|
|
setuid helper should do it).
|
|
|
|
Also, 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::cancel(bool timeout)
|
|
{
|
|
if (timeout)
|
|
printMsg(lvlError, format("@ build-failed %1% - timeout") % drvPath);
|
|
killChild();
|
|
amDone(ecFailed);
|
|
}
|
|
|
|
|
|
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
|
|
foreach (StringSet::const_iterator, i, outputs)
|
|
if (wantedOutputs.find(*i) == wantedOutputs.end()) {
|
|
wantedOutputs.insert(*i);
|
|
needRestart = true;
|
|
}
|
|
}
|
|
|
|
|
|
void DerivationGoal::init()
|
|
{
|
|
trace("init");
|
|
|
|
if (settings.readOnlyMode)
|
|
throw Error(format("cannot build derivation `%1%' - no write access to the Nix store") % drvPath);
|
|
|
|
/* The first thing to do is to make sure that the derivation
|
|
exists. If it doesn't, it may be created through a
|
|
substitute. */
|
|
addWaitee(worker.makeSubstitutionGoal(drvPath));
|
|
|
|
state = &DerivationGoal::haveDerivation;
|
|
}
|
|
|
|
|
|
void DerivationGoal::haveDerivation()
|
|
{
|
|
trace("loading derivation");
|
|
|
|
if (nrFailed != 0) {
|
|
printMsg(lvlError, format("cannot build missing derivation `%1%'") % drvPath);
|
|
amDone(ecFailed);
|
|
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 = derivationFromPath(worker.store, drvPath);
|
|
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
worker.store.addTempRoot(i->second.path);
|
|
|
|
/* Check what outputs paths are not already valid. */
|
|
PathSet invalidOutputs = checkPathValidity(false, repair);
|
|
|
|
/* If they are all valid, then we're done. */
|
|
if (invalidOutputs.size() == 0 && !repair) {
|
|
amDone(ecSuccess);
|
|
return;
|
|
}
|
|
|
|
/* Check whether any output previously failed to build. If so,
|
|
don't bother. */
|
|
foreach (PathSet::iterator, i, invalidOutputs)
|
|
if (pathFailed(*i)) return;
|
|
|
|
/* 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 && !willBuildLocally(drv))
|
|
foreach (PathSet::iterator, i, invalidOutputs)
|
|
addWaitee(worker.makeSubstitutionGoal(*i, repair));
|
|
|
|
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)
|
|
throw Error(format("some substitutes for the outputs of derivation `%1%' failed; try `--fallback'") % drvPath);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (checkPathValidity(false, repair).size() == 0) {
|
|
if (repair) repairClosure(); else amDone(ecSuccess);
|
|
return;
|
|
}
|
|
|
|
/* 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. */
|
|
foreach (DerivationInputs::iterator, i, drv.inputDrvs)
|
|
addWaitee(worker.makeDerivationGoal(i->first, i->second, repair));
|
|
|
|
foreach (PathSet::iterator, i, drv.inputSrcs)
|
|
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;
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
computeFSClosure(worker.store, i->second.path, outputClosure);
|
|
|
|
/* Filter out our own outputs (which we have already checked). */
|
|
foreach (DerivationOutputs::iterator, 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;
|
|
computeFSClosure(worker.store, drvPath, inputClosure);
|
|
std::map<Path, Path> outputsToDrv;
|
|
foreach (PathSet::iterator, i, inputClosure)
|
|
if (isDerivation(*i)) {
|
|
Derivation drv = derivationFromPath(worker.store, *i);
|
|
foreach (DerivationOutputs::iterator, j, drv.outputs)
|
|
outputsToDrv[j->second.path] = *i;
|
|
}
|
|
|
|
/* Check each path (slow!). */
|
|
PathSet broken;
|
|
foreach (PathSet::iterator, i, outputClosure) {
|
|
if (worker.store.pathContentsGood(*i)) continue;
|
|
printMsg(lvlError, 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(), true));
|
|
}
|
|
|
|
if (waitees.empty()) {
|
|
amDone(ecSuccess);
|
|
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);
|
|
amDone(ecSuccess);
|
|
}
|
|
|
|
|
|
void DerivationGoal::inputsRealised()
|
|
{
|
|
trace("all inputs realised");
|
|
|
|
if (nrFailed != 0) {
|
|
printMsg(lvlError,
|
|
format("cannot build derivation `%1%': "
|
|
"%2% dependencies couldn't be built")
|
|
% drvPath % nrFailed);
|
|
amDone(ecFailed);
|
|
return;
|
|
}
|
|
|
|
if (retrySubstitution) {
|
|
haveDerivation();
|
|
return;
|
|
}
|
|
|
|
/* Gather information necessary for computing the closure and/or
|
|
running the build hook. */
|
|
|
|
/* The outputs are referenceable paths. */
|
|
foreach (DerivationOutputs::iterator, 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. */
|
|
foreach (DerivationInputs::iterator, i, drv.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 = derivationFromPath(worker.store, i->first);
|
|
foreach (StringSet::iterator, j, i->second)
|
|
if (inDrv.outputs.find(*j) != inDrv.outputs.end())
|
|
computeFSClosure(worker.store, 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. */
|
|
foreach (PathSet::iterator, i, drv.inputSrcs)
|
|
computeFSClosure(worker.store, *i, inputPaths);
|
|
|
|
debug(format("added input paths %1%") % showPaths(inputPaths));
|
|
|
|
allPaths.insert(inputPaths.begin(), inputPaths.end());
|
|
|
|
/* Is this a fixed-output derivation? */
|
|
fixedOutput = true;
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
if (i->second.hash == "") fixedOutput = false;
|
|
|
|
/* 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());
|
|
}
|
|
|
|
|
|
PathSet outputPaths(const DerivationOutputs & outputs)
|
|
{
|
|
PathSet paths;
|
|
foreach (DerivationOutputs::const_iterator, i, outputs)
|
|
paths.insert(i->second.path);
|
|
return paths;
|
|
}
|
|
|
|
|
|
static string get(const StringPairs & map, const string & key)
|
|
{
|
|
StringPairs::const_iterator i = map.find(key);
|
|
return i == map.end() ? (string) "" : i->second;
|
|
}
|
|
|
|
|
|
static bool canBuildLocally(const string & platform)
|
|
{
|
|
return platform == settings.thisSystem
|
|
#ifdef CAN_DO_LINUX32_BUILDS
|
|
|| (platform == "i686-linux" && settings.thisSystem == "x86_64-linux")
|
|
#endif
|
|
;
|
|
}
|
|
|
|
|
|
bool willBuildLocally(const Derivation & drv)
|
|
{
|
|
return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
|
|
}
|
|
|
|
|
|
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. */
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
if (pathIsLockedByMe(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. */
|
|
if (!outputLocks.lockPaths(outputPaths(drv.outputs), "", 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, repair);
|
|
if (validPaths.size() == drv.outputs.size()) {
|
|
debug(format("skipping build of derivation `%1%', someone beat us to it")
|
|
% drvPath);
|
|
outputLocks.setDeletion(true);
|
|
amDone(ecSuccess);
|
|
return;
|
|
}
|
|
|
|
missingPaths = outputPaths(drv.outputs);
|
|
foreach (PathSet::iterator, i, validPaths) missingPaths.erase(*i);
|
|
|
|
/* If any of the outputs already exist but are not valid, delete
|
|
them. */
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs) {
|
|
Path path = i->second.path;
|
|
if (worker.store.isValidPath(path)) continue;
|
|
if (!pathExists(path)) continue;
|
|
debug(format("removing unregistered path `%1%'") % path);
|
|
deletePathWrapped(path);
|
|
}
|
|
|
|
/* Check again whether any output previously failed to build,
|
|
because some other process may have tried and failed before we
|
|
acquired the lock. */
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
if (pathFailed(i->second.path)) return;
|
|
|
|
/* Don't do a remote build if the derivation has the attribute
|
|
`preferLocalBuild' set. */
|
|
bool buildLocally = willBuildLocally(drv);
|
|
|
|
/* 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. */
|
|
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) {
|
|
printMsg(lvlError, e.msg());
|
|
outputLocks.unlock();
|
|
buildUser.release();
|
|
if (settings.printBuildTrace)
|
|
printMsg(lvlError, format("@ build-failed %1% - %2% %3%")
|
|
% drvPath % 0 % e.msg());
|
|
worker.permanentFailure = true;
|
|
amDone(ecFailed);
|
|
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);
|
|
if (pathExists(oldPath))
|
|
deletePathWrapped(oldPath);
|
|
}
|
|
|
|
|
|
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
|
|
:-) */
|
|
int status;
|
|
pid_t savedPid;
|
|
if (hook) {
|
|
savedPid = hook->pid;
|
|
status = hook->pid.wait(true);
|
|
} else {
|
|
/* !!! this could block! security problem! solution: kill the
|
|
child */
|
|
savedPid = pid;
|
|
status = pid.wait(true);
|
|
}
|
|
|
|
debug(format("builder process for `%1%' finished") % drvPath);
|
|
|
|
/* So the child is gone now. */
|
|
worker.childTerminated(savedPid);
|
|
|
|
/* Close the read side of the logger pipe. */
|
|
if (hook) {
|
|
hook->builderOut.readSide.close();
|
|
hook->fromHook.readSide.close();
|
|
}
|
|
else builderOut.readSide.close();
|
|
|
|
/* 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();
|
|
|
|
try {
|
|
|
|
/* Some cleanup per path. We do this here and not in
|
|
computeClosure() for convenience when the build has
|
|
failed. */
|
|
foreach (PathSet::iterator, i, missingPaths) {
|
|
Path path = *i;
|
|
|
|
/* If the output was already valid, just skip (discard) it. */
|
|
if (validPaths.find(path) != validPaths.end()) continue;
|
|
|
|
if (useChroot && pathExists(chrootRootDir + path)) {
|
|
/* Move output paths from the chroot to the Nix store. */
|
|
if (repair)
|
|
replaceValidPath(path, chrootRootDir + path);
|
|
else
|
|
if (rename((chrootRootDir + path).c_str(), path.c_str()) == -1)
|
|
throw SysError(format("moving build output `%1%' from the chroot to the Nix store") % path);
|
|
}
|
|
|
|
Path redirected;
|
|
if (repair && (redirected = redirectedBadOutputs[path]) != "" && pathExists(redirected))
|
|
replaceValidPath(path, redirected);
|
|
|
|
if (!pathExists(path)) continue;
|
|
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st) == -1)
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
#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. */
|
|
if (!rewritesFromTmp.empty()) {
|
|
printMsg(lvlError, 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(path, buildUser.enabled() ? buildUser.getUID() : -1, inodesSeen);
|
|
|
|
/* FIXME: this is in-memory. */
|
|
StringSink sink;
|
|
dumpPath(path, sink);
|
|
deletePath(path);
|
|
sink.s = rewriteHashes(sink.s, rewritesFromTmp);
|
|
StringSource source(sink.s);
|
|
restorePath(path, source);
|
|
|
|
rewrittenPaths.insert(path);
|
|
}
|
|
|
|
/* Gain ownership of the build result using the setuid
|
|
wrapper if we're not root. If we *are* root, then
|
|
canonicalisePathMetaData() will take care of this later
|
|
on. */
|
|
if (buildUser.enabled() && !amPrivileged())
|
|
getOwnership(path);
|
|
}
|
|
|
|
/* Check the exit status. */
|
|
if (!statusOk(status)) {
|
|
deleteTmpDir(false);
|
|
if (WIFEXITED(status) && WEXITSTATUS(status) == childSetupFailed)
|
|
throw Error(format("failed to set up the build environment for `%1%'") % drvPath);
|
|
throw BuildError(format("builder for `%1%' %2%")
|
|
% drvPath % statusToString(status));
|
|
}
|
|
|
|
/* Delete the chroot (if we were using one). */
|
|
autoDelChroot.reset(); /* this runs the destructor */
|
|
|
|
/* Delete redirected outputs (when doing hash rewriting). */
|
|
foreach (PathSet::iterator, i, redirectedOutputs)
|
|
deletePath(*i);
|
|
|
|
/* Compute the FS closure of the outputs and register them as
|
|
being valid. */
|
|
computeClosure();
|
|
|
|
deleteTmpDir(true);
|
|
|
|
/* 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) {
|
|
printMsg(lvlError, e.msg());
|
|
outputLocks.unlock();
|
|
buildUser.release();
|
|
|
|
/* When using a build hook, the hook will return a remote
|
|
build failure using exit code 100. Anything else is a hook
|
|
problem. */
|
|
bool hookError = hook &&
|
|
(!WIFEXITED(status) || WEXITSTATUS(status) != 100);
|
|
|
|
if (settings.printBuildTrace) {
|
|
if (hook && hookError)
|
|
printMsg(lvlError, format("@ hook-failed %1% - %2% %3%")
|
|
% drvPath % status % e.msg());
|
|
else
|
|
printMsg(lvlError, format("@ build-failed %1% - %2% %3%")
|
|
% drvPath % 1 % e.msg());
|
|
}
|
|
|
|
/* Register the outputs of this build as "failed" so we won't
|
|
try to build them again (negative caching). However, don't
|
|
do this for fixed-output derivations, since they're likely
|
|
to fail for transient reasons (e.g., fetchurl not being
|
|
able to access the network). Hook errors (like
|
|
communication problems with the remote machine) shouldn't
|
|
be cached either. */
|
|
if (settings.cacheFailure && !hookError && !fixedOutput)
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
worker.store.registerFailedPath(i->second.path);
|
|
|
|
worker.permanentFailure = !hookError && !fixedOutput;
|
|
amDone(ecFailed);
|
|
return;
|
|
}
|
|
|
|
/* Release the build user, if applicable. */
|
|
buildUser.release();
|
|
|
|
if (settings.printBuildTrace) {
|
|
printMsg(lvlError, format("@ build-succeeded %1% -") % drvPath);
|
|
}
|
|
|
|
amDone(ecSuccess);
|
|
}
|
|
|
|
|
|
HookReply DerivationGoal::tryBuildHook()
|
|
{
|
|
if (!settings.useBuildHook || getEnv("NIX_BUILD_HOOK") == "") return rpDecline;
|
|
|
|
if (!worker.hook)
|
|
worker.hook = boost::shared_ptr<HookInstance>(new 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"));
|
|
foreach (Strings::iterator, i, features) checkStoreName(*i); /* !!! abuse */
|
|
|
|
/* Send the request to the hook. */
|
|
writeLine(worker.hook->toHook.writeSide, (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);
|
|
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(outputPaths(drv.outputs)));
|
|
|
|
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());
|
|
computeFSClosure(worker.store, drvPath, allInputs);
|
|
|
|
string s;
|
|
foreach (PathSet::iterator, i, allInputs) s += *i + " ";
|
|
writeLine(hook->toHook.writeSide, s);
|
|
|
|
/* Tell the hooks the outputs that have to be copied back from the
|
|
remote system. */
|
|
s = "";
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
s += i->second.path + " ";
|
|
writeLine(hook->toHook.writeSide, s);
|
|
|
|
hook->toHook.writeSide.close();
|
|
|
|
/* Create the log file and pipe. */
|
|
Path logFile = openLogFile();
|
|
|
|
set<int> fds;
|
|
fds.insert(hook->fromHook.readSide);
|
|
fds.insert(hook->builderOut.readSide);
|
|
worker.childStarted(shared_from_this(), hook->pid, fds, false, true);
|
|
|
|
if (settings.printBuildTrace)
|
|
printMsg(lvlError, format("@ build-started %1% - %2% %3%")
|
|
% drvPath % drv.platform % logFile);
|
|
|
|
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)->initChild();
|
|
return 1;
|
|
}
|
|
|
|
|
|
void DerivationGoal::startBuilder()
|
|
{
|
|
startNest(nest, lvlInfo, format(repair ? "repairing path(s) %1%" : "building path(s) %1%") % showPaths(missingPaths));
|
|
|
|
/* Right platform? */
|
|
if (!canBuildLocally(drv.platform))
|
|
throw Error(
|
|
format("a `%1%' is required to build `%3%', but I am a `%2%'")
|
|
% drv.platform % settings.thisSystem % drvPath);
|
|
|
|
/* Construct the environment passed to the builder. */
|
|
|
|
/* 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"] = settings.nixStore;
|
|
|
|
/* The maximum number of cores to utilize for parallel building. */
|
|
env["NIX_BUILD_CORES"] = (format("%d") % settings.buildCores).str();
|
|
|
|
/* Add all bindings specified in the derivation. */
|
|
foreach (StringPairs::iterator, i, drv.env)
|
|
env[i->first] = i->second;
|
|
|
|
/* Create a temporary directory where the build will take
|
|
place. */
|
|
tmpDir = createTempDir("", "nix-build-" + storePathToName(drvPath), false, false, 0700);
|
|
|
|
/* For convenience, set an environment pointing to the top build
|
|
directory. */
|
|
env["NIX_BUILD_TOP"] = tmpDir;
|
|
|
|
/* Also set TMPDIR and variants to point to this directory. */
|
|
env["TMPDIR"] = env["TEMPDIR"] = env["TMP"] = env["TEMP"] = tmpDir;
|
|
|
|
/* 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"] = tmpDir;
|
|
|
|
/* 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"));
|
|
foreach (Strings::iterator, i, varNames) env[*i] = getEnv(*i);
|
|
}
|
|
|
|
/* 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 (!isInStore(storePath))
|
|
throw BuildError(format("`exportReferencesGraph' contains a non-store path `%1%'")
|
|
% storePath);
|
|
storePath = 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;
|
|
computeFSClosure(worker.store, storePath, paths);
|
|
paths2 = paths;
|
|
|
|
foreach (PathSet::iterator, j, paths2) {
|
|
if (isDerivation(*j)) {
|
|
Derivation drv = derivationFromPath(worker.store, *j);
|
|
foreach (DerivationOutputs::iterator, k, drv.outputs)
|
|
computeFSClosure(worker.store, 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 != "") {
|
|
buildUser.acquire();
|
|
assert(buildUser.getUID() != 0);
|
|
assert(buildUser.getGID() != 0);
|
|
|
|
/* Make sure that no other processes are executing under this
|
|
uid. */
|
|
buildUser.kill();
|
|
|
|
/* Change ownership of the temporary build directory, if we're
|
|
root. If we're not root, then the setuid helper will do it
|
|
just before it starts the builder. */
|
|
if (amPrivileged()) {
|
|
if (chown(tmpDir.c_str(), buildUser.getUID(), buildUser.getGID()) == -1)
|
|
throw SysError(format("cannot change ownership of `%1%'") % tmpDir);
|
|
}
|
|
|
|
/* Check that the Nix store has the appropriate permissions,
|
|
i.e., owned by root and mode 1775 (sticky bit on so that
|
|
the builder can create its output but not mess with the
|
|
outputs of other processes). */
|
|
struct stat st;
|
|
if (stat(settings.nixStore.c_str(), &st) == -1)
|
|
throw SysError(format("cannot stat `%1%'") % settings.nixStore);
|
|
if (!(st.st_mode & S_ISVTX) ||
|
|
((st.st_mode & S_IRWXG) != S_IRWXG) ||
|
|
(st.st_gid != buildUser.getGID()))
|
|
throw Error(format(
|
|
"builder does not have write permission to `%2%'; "
|
|
"try `chgrp %1% %2%; chmod 1775 %2%'")
|
|
% buildUser.getGID() % settings.nixStore);
|
|
}
|
|
|
|
|
|
/* 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. */
|
|
useChroot = settings.useChroot;
|
|
|
|
if (fixedOutput) useChroot = false;
|
|
|
|
/* Hack to allow derivations to disable chroot builds. */
|
|
if (get(drv.env, "__noChroot") == "1") useChroot = false;
|
|
|
|
if (useChroot) {
|
|
#if CHROOT_ENABLED
|
|
/* 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 = drvPath + ".chroot";
|
|
if (pathExists(chrootRootDir)) deletePath(chrootRootDir);
|
|
|
|
/* Clean up the chroot directory automatically. */
|
|
autoDelChroot = boost::shared_ptr<AutoDelete>(new AutoDelete(chrootRootDir));
|
|
|
|
printMsg(lvlChatty, format("setting up chroot environment in `%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(
|
|
"nixbld:x:%1%:%2%:Nix build user:/:/noshell\n"
|
|
"nobody:x:65534:65534:Nobody:/:/noshell\n")
|
|
% (buildUser.enabled() ? buildUser.getUID() : getuid())
|
|
% (buildUser.enabled() ? buildUser.getGID() : getgid())).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("nixbld:!:%1%:\n")
|
|
% (buildUser.enabled() ? buildUser.getGID() : getgid())).str());
|
|
|
|
/* Create /etc/hosts with localhost entry. */
|
|
writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n");
|
|
|
|
/* Bind-mount a user-configurable set of directories from the
|
|
host file system. */
|
|
foreach (StringSet::iterator, i, settings.dirsInChroot) {
|
|
size_t p = i->find('=');
|
|
if (p == string::npos)
|
|
dirsInChroot[*i] = *i;
|
|
else
|
|
dirsInChroot[string(*i, 0, p)] = string(*i, p + 1);
|
|
}
|
|
dirsInChroot[tmpDir] = tmpDir;
|
|
|
|
/* 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. */
|
|
createDirs(chrootRootDir + settings.nixStore);
|
|
chmod_(chrootRootDir + settings.nixStore, 01777);
|
|
|
|
foreach (PathSet::iterator, i, inputPaths) {
|
|
struct stat st;
|
|
if (lstat(i->c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % *i);
|
|
if (S_ISDIR(st.st_mode))
|
|
dirsInChroot[*i] = *i;
|
|
else {
|
|
Path p = chrootRootDir + *i;
|
|
if (link(i->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(*i, sink);
|
|
StringSource source(sink.s);
|
|
restorePath(p, source);
|
|
}
|
|
|
|
regularInputPaths.insert(*i);
|
|
}
|
|
}
|
|
|
|
/* If we're repairing, it's possible that we're rebuilding a
|
|
path that is in settings.dirsInChroot (typically the
|
|
dependencies of /bin/sh). Throw them out. */
|
|
if (repair)
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
dirsInChroot.erase(i->second.path);
|
|
|
|
#else
|
|
throw Error("chroot builds are 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)
|
|
//throw Error(format("derivation `%1%' is blocked by its output path(s) %2%") % drvPath % showPaths(validPaths));
|
|
foreach (PathSet::iterator, i, validPaths)
|
|
redirectedOutputs.insert(addHashRewrite(*i));
|
|
|
|
/* If we're repairing, then we don't want to delete the
|
|
corrupt outputs in advance. So rewrite them as well. */
|
|
if (repair)
|
|
foreach (PathSet::iterator, i, missingPaths)
|
|
if (worker.store.isValidPath(*i) && pathExists(*i))
|
|
redirectedBadOutputs[*i] = addHashRewrite(*i);
|
|
}
|
|
|
|
|
|
/* 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();
|
|
|
|
/* Fork a child to build the package. Note that while we
|
|
currently use forks to run and wait for the children, it
|
|
shouldn't be hard to use threads for this on systems where
|
|
fork() is unavailable or inefficient.
|
|
|
|
If we're building in a chroot, then also 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.
|
|
|
|
- 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.
|
|
*/
|
|
#if CHROOT_ENABLED
|
|
if (useChroot) {
|
|
char stack[32 * 1024];
|
|
pid = clone(childEntry, stack + sizeof(stack) - 8,
|
|
CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWNET | CLONE_NEWIPC | CLONE_NEWUTS | SIGCHLD, this);
|
|
} else
|
|
#endif
|
|
{
|
|
pid = fork();
|
|
if (pid == 0) initChild();
|
|
}
|
|
|
|
if (pid == -1) throw SysError("unable to fork");
|
|
|
|
/* parent */
|
|
pid.setSeparatePG(true);
|
|
builderOut.writeSide.close();
|
|
worker.childStarted(shared_from_this(), pid,
|
|
singleton<set<int> >(builderOut.readSide), true, true);
|
|
|
|
if (settings.printBuildTrace) {
|
|
printMsg(lvlError, format("@ build-started %1% - %2% %3%")
|
|
% drvPath % drv.platform % logFile);
|
|
}
|
|
}
|
|
|
|
|
|
void DerivationGoal::initChild()
|
|
{
|
|
/* Warning: in the child we should absolutely not make any SQLite
|
|
calls! */
|
|
|
|
bool inSetup = true;
|
|
|
|
try { /* child */
|
|
|
|
#if CHROOT_ENABLED
|
|
if (useChroot) {
|
|
/* Initialise the loopback interface. */
|
|
AutoCloseFD fd(socket(PF_INET, SOCK_DGRAM, IPPROTO_IP));
|
|
if (fd == -1) 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, SIOCSIFFLAGS, &ifr) == -1)
|
|
throw SysError("cannot set loopback interface flags");
|
|
|
|
fd.close();
|
|
|
|
/* Set the hostname etc. to fixed values. */
|
|
char hostname[] = "localhost";
|
|
sethostname(hostname, sizeof(hostname));
|
|
char domainname[] = "(none)"; // kernel default
|
|
setdomainname(domainname, sizeof(domainname));
|
|
|
|
/* 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");
|
|
foreach (Strings::iterator, 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 all the directories from the "host"
|
|
filesystem that we want in the chroot
|
|
environment. */
|
|
foreach (DirsInChroot::iterator, i, dirsInChroot) {
|
|
struct stat st;
|
|
Path source = i->second;
|
|
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)
|
|
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, 0) == -1)
|
|
throw SysError(format("bind mount from `%1%' to `%2%' failed") % source % target);
|
|
}
|
|
|
|
/* Bind a new instance of procfs on /proc to reflect our
|
|
private PID namespace. */
|
|
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"))
|
|
if (mount("none", (chrootRootDir + "/dev/shm").c_str(), "tmpfs", 0, 0) == -1)
|
|
throw SysError("mounting /dev/shm");
|
|
|
|
/* Do the chroot(). Below we do a chdir() to the
|
|
temporary build directory to make sure the current
|
|
directory is in the chroot. (Actually the order
|
|
doesn't matter, since due to the bind mount tmpDir and
|
|
tmpRootDit/tmpDir are the same directories.) */
|
|
if (chroot(chrootRootDir.c_str()) == -1)
|
|
throw SysError(format("cannot change root directory to `%1%'") % chrootRootDir);
|
|
}
|
|
#endif
|
|
|
|
commonChildInit(builderOut);
|
|
|
|
if (chdir(tmpDir.c_str()) == -1)
|
|
throw SysError(format("changing into `%1%'") % tmpDir);
|
|
|
|
/* Close all other file descriptors. */
|
|
closeMostFDs(set<int>());
|
|
|
|
#ifdef CAN_DO_LINUX32_BUILDS
|
|
/* Change the personality to 32-bit if we're doing an
|
|
i686-linux build on an x86_64-linux machine. */
|
|
if (drv.platform == "i686-linux" && settings.thisSystem == "x86_64-linux") {
|
|
if (personality(0x0008 | 0x8000000 /* == PER_LINUX32_3GB */) == -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 */);
|
|
}
|
|
#endif
|
|
|
|
/* Fill in the environment. */
|
|
Strings envStrs;
|
|
foreach (Environment::const_iterator, i, env)
|
|
envStrs.push_back(rewriteHashes(i->first + "=" + i->second, rewritesToTmp));
|
|
const char * * envArr = strings2CharPtrs(envStrs);
|
|
|
|
Path program = drv.builder.c_str();
|
|
std::vector<const char *> args; /* careful with c_str()! */
|
|
string user; /* must be here for its c_str()! */
|
|
|
|
/* 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 (buildUser.enabled()) {
|
|
printMsg(lvlChatty, format("switching to user `%1%'") % buildUser.getUser());
|
|
|
|
if (amPrivileged()) {
|
|
|
|
if (setgroups(0, 0) == -1)
|
|
throw SysError("cannot clear the set of supplementary groups");
|
|
|
|
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");
|
|
|
|
} else {
|
|
/* Let the setuid helper take care of it. */
|
|
program = settings.nixLibexecDir + "/nix-setuid-helper";
|
|
args.push_back(program.c_str());
|
|
args.push_back("run-builder");
|
|
user = buildUser.getUser().c_str();
|
|
args.push_back(user.c_str());
|
|
args.push_back(drv.builder.c_str());
|
|
}
|
|
}
|
|
|
|
/* Fill in the arguments. */
|
|
string builderBasename = baseNameOf(drv.builder);
|
|
args.push_back(builderBasename.c_str());
|
|
foreach (Strings::iterator, i, drv.args)
|
|
args.push_back(rewriteHashes(*i, rewritesToTmp).c_str());
|
|
args.push_back(0);
|
|
|
|
restoreSIGPIPE();
|
|
|
|
/* Execute the program. This should not return. */
|
|
inSetup = false;
|
|
execve(program.c_str(), (char * *) &args[0], (char * *) envArr);
|
|
|
|
throw SysError(format("executing `%1%'") % drv.builder);
|
|
|
|
} catch (std::exception & e) {
|
|
writeToStderr("build error: " + string(e.what()) + "\n");
|
|
_exit(inSetup ? childSetupFailed : 1);
|
|
}
|
|
|
|
abort(); /* never reached */
|
|
}
|
|
|
|
|
|
/* 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(const Derivation & drv, string attr)
|
|
{
|
|
PathSet result;
|
|
Paths paths = tokenizeString<Paths>(attr);
|
|
foreach (Strings::iterator, i, paths) {
|
|
if (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::computeClosure()
|
|
{
|
|
map<Path, PathSet> allReferences;
|
|
map<Path, HashResult> contentHashes;
|
|
|
|
/* 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;
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs)
|
|
if (!worker.store.isValidPath(i->second.path)) allValid = false;
|
|
if (allValid) return;
|
|
}
|
|
|
|
/* 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. */
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs) {
|
|
Path path = i->second.path;
|
|
if (missingPaths.find(path) == missingPaths.end()) continue;
|
|
|
|
if (!pathExists(path)) {
|
|
throw BuildError(
|
|
format("builder for `%1%' failed to produce output path `%2%'")
|
|
% drvPath % path);
|
|
}
|
|
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st) == -1)
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
startNest(nest, lvlTalkative,
|
|
format("scanning for references inside `%1%'") % path);
|
|
|
|
/* 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; HashType ht; Hash h;
|
|
i->second.parseHashInfo(recursive, ht, 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. */
|
|
Hash h2 = recursive ? hashPath(ht, path).first : hashFile(ht, path);
|
|
if (h != h2)
|
|
throw BuildError(
|
|
format("output path `%1%' should have %2% hash `%3%', instead has `%4%'")
|
|
% path % i->second.hashAlgo % printHash16or32(h) % printHash16or32(h2));
|
|
}
|
|
|
|
/* Get rid of all weird permissions. This also checks that
|
|
all files are owned by the build user, if applicable. */
|
|
canonicalisePathMetaData(path,
|
|
buildUser.enabled() && rewrittenPaths.find(path) == rewrittenPaths.end() ? 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. */
|
|
HashResult hash;
|
|
PathSet references = scanForReferences(path, allPaths, hash);
|
|
contentHashes[path] = hash;
|
|
|
|
/* For debugging, print out the referenced and unreferenced
|
|
paths. */
|
|
foreach (PathSet::iterator, 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);
|
|
}
|
|
|
|
allReferences[path] = references;
|
|
|
|
/* If the derivation specifies an `allowedReferences'
|
|
attribute (containing a list of paths that the output may
|
|
refer to), check that all references are in that list. !!!
|
|
allowedReferences should really be per-output. */
|
|
if (drv.env.find("allowedReferences") != drv.env.end()) {
|
|
PathSet allowed = parseReferenceSpecifiers(drv, get(drv.env, "allowedReferences"));
|
|
foreach (PathSet::iterator, i, references)
|
|
if (allowed.find(*i) == allowed.end())
|
|
throw BuildError(format("output is not allowed to refer to path `%1%'") % *i);
|
|
}
|
|
|
|
worker.store.optimisePath(path); // FIXME: combine with scanForReferences()
|
|
|
|
worker.store.markContentsGood(path);
|
|
}
|
|
|
|
/* 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. */
|
|
ValidPathInfos infos;
|
|
foreach (PathSet::iterator, i, missingPaths) {
|
|
ValidPathInfo info;
|
|
info.path = *i;
|
|
info.hash = contentHashes[*i].first;
|
|
info.narSize = contentHashes[*i].second;
|
|
info.references = allReferences[*i];
|
|
info.deriver = drvPath;
|
|
infos.push_back(info);
|
|
}
|
|
worker.store.registerValidPaths(infos);
|
|
}
|
|
|
|
|
|
string drvsLogDir = "drvs";
|
|
|
|
|
|
Path DerivationGoal::openLogFile()
|
|
{
|
|
if (!settings.keepLog) return "";
|
|
|
|
string baseName = baseNameOf(drvPath);
|
|
|
|
/* Create a log file. */
|
|
Path dir = (format("%1%/%2%/%3%/") % settings.nixLogDir % drvsLogDir % string(baseName, 0, 2)).str();
|
|
createDirs(dir);
|
|
|
|
if (settings.compressLog) {
|
|
|
|
Path logFileName = (format("%1%/%2%.bz2") % dir % string(baseName, 2)).str();
|
|
AutoCloseFD fd = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
|
|
if (fd == -1) throw SysError(format("creating log file `%1%'") % logFileName);
|
|
closeOnExec(fd);
|
|
|
|
if (!(fLogFile = fdopen(fd.borrow(), "w")))
|
|
throw SysError(format("opening file `%1%'") % logFileName);
|
|
|
|
int err;
|
|
if (!(bzLogFile = BZ2_bzWriteOpen(&err, fLogFile, 9, 0, 0)))
|
|
throw Error(format("cannot open compressed log file `%1%'") % logFileName);
|
|
|
|
return logFileName;
|
|
|
|
} else {
|
|
Path logFileName = (format("%1%/%2%") % dir % string(baseName, 2)).str();
|
|
fdLogFile = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
|
|
if (fdLogFile == -1) throw SysError(format("creating log file `%1%'") % logFileName);
|
|
closeOnExec(fdLogFile);
|
|
return logFileName;
|
|
}
|
|
}
|
|
|
|
|
|
void DerivationGoal::closeLogFile()
|
|
{
|
|
if (bzLogFile) {
|
|
int err;
|
|
BZ2_bzWriteClose(&err, bzLogFile, 0, 0, 0);
|
|
bzLogFile = 0;
|
|
if (err != BZ_OK) throw Error(format("cannot close compressed log file (BZip2 error = %1%)") % err);
|
|
}
|
|
|
|
if (fLogFile) {
|
|
fclose(fLogFile);
|
|
fLogFile = 0;
|
|
}
|
|
|
|
fdLogFile.close();
|
|
}
|
|
|
|
|
|
void DerivationGoal::deleteTmpDir(bool force)
|
|
{
|
|
if (tmpDir != "") {
|
|
if (settings.keepFailed && !force) {
|
|
printMsg(lvlError,
|
|
format("note: keeping build directory `%2%'")
|
|
% drvPath % tmpDir);
|
|
if (buildUser.enabled() && !amPrivileged())
|
|
getOwnership(tmpDir);
|
|
chmod(tmpDir.c_str(), 0755);
|
|
}
|
|
else
|
|
deletePathWrapped(tmpDir);
|
|
tmpDir = "";
|
|
}
|
|
}
|
|
|
|
|
|
void DerivationGoal::handleChildOutput(int fd, const string & data)
|
|
{
|
|
if ((hook && fd == hook->builderOut.readSide) ||
|
|
(!hook && fd == builderOut.readSide))
|
|
{
|
|
if (verbosity >= settings.buildVerbosity)
|
|
writeToStderr(data);
|
|
if (bzLogFile) {
|
|
int err;
|
|
BZ2_bzWrite(&err, bzLogFile, (unsigned char *) data.data(), data.size());
|
|
if (err != BZ_OK) throw Error(format("cannot write to compressed log file (BZip2 error = %1%)") % err);
|
|
} else if (fdLogFile != -1)
|
|
writeFull(fdLogFile, (unsigned char *) data.data(), data.size());
|
|
}
|
|
|
|
if (hook && fd == hook->fromHook.readSide)
|
|
writeToStderr(data);
|
|
}
|
|
|
|
|
|
void DerivationGoal::handleEOF(int fd)
|
|
{
|
|
worker.wakeUp(shared_from_this());
|
|
}
|
|
|
|
|
|
PathSet DerivationGoal::checkPathValidity(bool returnValid, bool checkHash)
|
|
{
|
|
PathSet result;
|
|
foreach (DerivationOutputs::iterator, i, drv.outputs) {
|
|
if (!wantOutput(i->first, wantedOutputs)) continue;
|
|
bool good =
|
|
worker.store.isValidPath(i->second.path) &&
|
|
(!checkHash || worker.store.pathContentsGood(i->second.path));
|
|
if (good == returnValid) result.insert(i->second.path);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
bool DerivationGoal::pathFailed(const Path & path)
|
|
{
|
|
if (!settings.cacheFailure) return false;
|
|
|
|
if (!worker.store.hasPathFailed(path)) return false;
|
|
|
|
printMsg(lvlError, format("builder for `%1%' failed previously (cached)") % path);
|
|
|
|
if (settings.printBuildTrace)
|
|
printMsg(lvlError, format("@ build-failed %1% - cached") % drvPath);
|
|
|
|
worker.permanentFailure = true;
|
|
amDone(ecFailed);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
Path DerivationGoal::addHashRewrite(const Path & path)
|
|
{
|
|
string h1 = string(path, settings.nixStore.size() + 1, 32);
|
|
string h2 = string(printHash32(hashString(htSHA256, "rewrite:" + drvPath + ":" + path)), 0, 32);
|
|
Path p = settings.nixStore + "/" + h2 + string(path, settings.nixStore.size() + 33);
|
|
if (pathExists(p)) deletePathWrapped(p);
|
|
assert(path.size() == p.size());
|
|
rewritesToTmp[h1] = h2;
|
|
rewritesFromTmp[h2] = h1;
|
|
return p;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
class SubstitutionGoal : public Goal
|
|
{
|
|
friend class Worker;
|
|
|
|
private:
|
|
/* The store path that should be realised through a substitute. */
|
|
Path storePath;
|
|
|
|
/* The remaining substituters. */
|
|
Paths subs;
|
|
|
|
/* The current substituter. */
|
|
Path sub;
|
|
|
|
/* Whether any substituter can realise this path */
|
|
bool hasSubstitute;
|
|
|
|
/* Path info returned by the substituter's query info operation. */
|
|
SubstitutablePathInfo info;
|
|
|
|
/* Pipe for the substituter's standard output. */
|
|
Pipe outPipe;
|
|
|
|
/* Pipe for the substituter's standard error. */
|
|
Pipe logPipe;
|
|
|
|
/* The process ID of the builder. */
|
|
Pid pid;
|
|
|
|
/* Lock on the store path. */
|
|
boost::shared_ptr<PathLocks> outputLock;
|
|
|
|
/* 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 cancel(bool timeout);
|
|
|
|
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()
|
|
{
|
|
/* !!! Once we let substitution goals run under a build user, we
|
|
need to use the setuid helper just as in ~DerivationGoal().
|
|
Idem for cancel. */
|
|
if (pid != -1) worker.childTerminated(pid);
|
|
}
|
|
|
|
|
|
void SubstitutionGoal::cancel(bool timeout)
|
|
{
|
|
if (timeout)
|
|
printMsg(lvlError, format("@ substituter-failed %1% timeout") % storePath);
|
|
if (pid != -1) {
|
|
pid_t savedPid = pid;
|
|
pid.kill();
|
|
worker.childTerminated(savedPid);
|
|
}
|
|
amDone(ecFailed);
|
|
}
|
|
|
|
|
|
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.substituters;
|
|
|
|
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();
|
|
|
|
SubstitutablePathInfos infos;
|
|
PathSet dummy(singleton<PathSet>(storePath));
|
|
worker.store.querySubstitutablePathInfos(sub, dummy, infos);
|
|
SubstitutablePathInfos::iterator k = infos.find(storePath);
|
|
if (k == infos.end()) { tryNext(); return; }
|
|
info = k->second;
|
|
hasSubstitute = true;
|
|
|
|
/* To maintain the closure invariant, we first have to realise the
|
|
paths referenced by this one. */
|
|
foreach (PathSet::iterator, 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;
|
|
}
|
|
|
|
foreach (PathSet::iterator, 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;
|
|
}
|
|
|
|
/* Maybe a derivation goal has already locked this path
|
|
(exceedingly unlikely, since it should have used a substitute
|
|
first, but let's be defensive). */
|
|
outputLock.reset(); // make sure this goal's lock is gone
|
|
if (pathIsLockedByMe(storePath)) {
|
|
debug(format("restarting substitution of `%1%' because it's locked by another goal")
|
|
% storePath);
|
|
worker.waitForAnyGoal(shared_from_this());
|
|
return; /* restart in the tryToRun() state when another goal finishes */
|
|
}
|
|
|
|
/* Acquire a lock on the output path. */
|
|
outputLock = boost::shared_ptr<PathLocks>(new PathLocks);
|
|
if (!outputLock->lockPaths(singleton<PathSet>(storePath), "", false)) {
|
|
worker.waitForAWhile(shared_from_this());
|
|
return;
|
|
}
|
|
|
|
/* Check again whether the path is invalid. */
|
|
if (!repair && worker.store.isValidPath(storePath)) {
|
|
debug(format("store path `%1%' has become valid") % storePath);
|
|
outputLock->setDeletion(true);
|
|
amDone(ecSuccess);
|
|
return;
|
|
}
|
|
|
|
printMsg(lvlInfo, format("fetching path `%1%'...") % storePath);
|
|
|
|
outPipe.create();
|
|
logPipe.create();
|
|
|
|
destPath = repair ? storePath + ".tmp" : storePath;
|
|
|
|
/* Remove the (stale) output path if it exists. */
|
|
if (pathExists(destPath))
|
|
deletePathWrapped(destPath);
|
|
|
|
worker.store.setSubstituterEnv();
|
|
|
|
/* Fill in the arguments. */
|
|
Strings args;
|
|
args.push_back(baseNameOf(sub));
|
|
args.push_back("--substitute");
|
|
args.push_back(storePath);
|
|
args.push_back(destPath);
|
|
const char * * argArr = strings2CharPtrs(args);
|
|
|
|
/* Fork the substitute program. */
|
|
pid = maybeVfork();
|
|
|
|
switch (pid) {
|
|
|
|
case -1:
|
|
throw SysError("unable to fork");
|
|
|
|
case 0:
|
|
try { /* child */
|
|
|
|
commonChildInit(logPipe);
|
|
|
|
if (dup2(outPipe.writeSide, STDOUT_FILENO) == -1)
|
|
throw SysError("cannot dup output pipe into stdout");
|
|
|
|
execv(sub.c_str(), (char * *) argArr);
|
|
|
|
throw SysError(format("executing `%1%'") % sub);
|
|
|
|
} catch (std::exception & e) {
|
|
writeToStderr("substitute error: " + string(e.what()) + "\n");
|
|
}
|
|
_exit(1);
|
|
}
|
|
|
|
/* parent */
|
|
pid.setSeparatePG(true);
|
|
pid.setKillSignal(SIGTERM);
|
|
outPipe.writeSide.close();
|
|
logPipe.writeSide.close();
|
|
worker.childStarted(shared_from_this(),
|
|
pid, singleton<set<int> >(logPipe.readSide), true, true);
|
|
|
|
state = &SubstitutionGoal::finished;
|
|
|
|
if (settings.printBuildTrace)
|
|
printMsg(lvlError, format("@ substituter-started %1% %2%") % storePath % sub);
|
|
}
|
|
|
|
|
|
void SubstitutionGoal::finished()
|
|
{
|
|
trace("substitute finished");
|
|
|
|
/* Since we got an EOF on the logger pipe, the substitute is
|
|
presumed to have terminated. */
|
|
pid_t savedPid = pid;
|
|
int status = pid.wait(true);
|
|
|
|
/* So the child is gone now. */
|
|
worker.childTerminated(savedPid);
|
|
|
|
/* Close the read side of the logger pipe. */
|
|
logPipe.readSide.close();
|
|
|
|
/* Get the hash info from stdout. */
|
|
string expectedHashStr = statusOk(status) ? readLine(outPipe.readSide) : "";
|
|
outPipe.readSide.close();
|
|
|
|
/* Check the exit status and the build result. */
|
|
HashResult hash;
|
|
try {
|
|
|
|
if (!statusOk(status))
|
|
throw SubstError(format("fetching path `%1%' %2%")
|
|
% storePath % statusToString(status));
|
|
|
|
if (!pathExists(destPath))
|
|
throw SubstError(format("substitute did not produce path `%1%'") % destPath);
|
|
|
|
hash = hashPath(htSHA256, destPath);
|
|
|
|
/* Verify the expected hash we got from the substituer. */
|
|
if (expectedHashStr != "") {
|
|
size_t n = expectedHashStr.find(':');
|
|
if (n == string::npos)
|
|
throw Error(format("bad hash from substituter: %1%") % expectedHashStr);
|
|
HashType hashType = parseHashType(string(expectedHashStr, 0, n));
|
|
if (hashType == htUnknown)
|
|
throw Error(format("unknown hash algorithm in `%1%'") % expectedHashStr);
|
|
Hash expectedHash = parseHash16or32(hashType, string(expectedHashStr, n + 1));
|
|
Hash actualHash = hashType == htSHA256 ? hash.first : hashPath(hashType, destPath).first;
|
|
if (expectedHash != actualHash)
|
|
throw SubstError(format("hash mismatch in downloaded path `%1%': expected %2%, got %3%")
|
|
% storePath % printHash(expectedHash) % printHash(actualHash));
|
|
}
|
|
|
|
} catch (SubstError & e) {
|
|
|
|
printMsg(lvlInfo, e.msg());
|
|
|
|
if (settings.printBuildTrace) {
|
|
printMsg(lvlError, format("@ substituter-failed %1% %2% %3%")
|
|
% storePath % status % e.msg());
|
|
}
|
|
|
|
/* Try the next substitute. */
|
|
state = &SubstitutionGoal::tryNext;
|
|
worker.wakeUp(shared_from_this());
|
|
return;
|
|
}
|
|
|
|
canonicalisePathMetaData(destPath, -1);
|
|
|
|
worker.store.optimisePath(destPath); // FIXME: combine with hashPath()
|
|
|
|
if (repair) replaceValidPath(storePath, destPath);
|
|
|
|
ValidPathInfo info2;
|
|
info2.path = storePath;
|
|
info2.hash = hash.first;
|
|
info2.narSize = hash.second;
|
|
info2.references = info.references;
|
|
info2.deriver = info.deriver;
|
|
worker.store.registerValidPath(info2);
|
|
|
|
outputLock->setDeletion(true);
|
|
|
|
worker.store.markContentsGood(storePath);
|
|
|
|
printMsg(lvlChatty,
|
|
format("substitution of path `%1%' succeeded") % storePath);
|
|
|
|
if (settings.printBuildTrace)
|
|
printMsg(lvlError, format("@ substituter-succeeded %1%") % storePath);
|
|
|
|
amDone(ecSuccess);
|
|
}
|
|
|
|
|
|
void SubstitutionGoal::handleChildOutput(int fd, const string & data)
|
|
{
|
|
assert(fd == logPipe.readSide);
|
|
if (verbosity >= settings.buildVerbosity) writeToStderr(data);
|
|
/* Don't write substitution output to a log file for now. We
|
|
probably should, though. */
|
|
}
|
|
|
|
|
|
void SubstitutionGoal::handleEOF(int fd)
|
|
{
|
|
if (fd == logPipe.readSide) 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 = 0;
|
|
permanentFailure = 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, bool repair)
|
|
{
|
|
GoalPtr goal = derivationGoals[path].lock();
|
|
if (!goal) {
|
|
goal = GoalPtr(new DerivationGoal(path, wantedOutputs, *this, repair));
|
|
derivationGoals[path] = goal;
|
|
wakeUp(goal);
|
|
} else
|
|
(dynamic_cast<DerivationGoal *>(goal.get()))->addWantedOutputs(wantedOutputs);
|
|
return goal;
|
|
}
|
|
|
|
|
|
GoalPtr Worker::makeSubstitutionGoal(const Path & path, bool repair)
|
|
{
|
|
GoalPtr goal = substitutionGoals[path].lock();
|
|
if (!goal) {
|
|
goal = GoalPtr(new 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. */
|
|
foreach (WeakGoals::iterator, i, waitingForAnyGoal) {
|
|
GoalPtr goal = i->lock();
|
|
if (goal) wakeUp(goal);
|
|
}
|
|
|
|
waitingForAnyGoal.clear();
|
|
}
|
|
|
|
|
|
void Worker::wakeUp(GoalPtr goal)
|
|
{
|
|
goal->trace("woken up");
|
|
awake.insert(goal);
|
|
}
|
|
|
|
|
|
unsigned Worker::getNrLocalBuilds()
|
|
{
|
|
return nrLocalBuilds;
|
|
}
|
|
|
|
|
|
void Worker::childStarted(GoalPtr goal,
|
|
pid_t pid, const set<int> & fds, bool inBuildSlot,
|
|
bool respectTimeouts)
|
|
{
|
|
Child child;
|
|
child.goal = goal;
|
|
child.fds = fds;
|
|
child.timeStarted = child.lastOutput = time(0);
|
|
child.inBuildSlot = inBuildSlot;
|
|
child.respectTimeouts = respectTimeouts;
|
|
children[pid] = child;
|
|
if (inBuildSlot) nrLocalBuilds++;
|
|
}
|
|
|
|
|
|
void Worker::childTerminated(pid_t pid, bool wakeSleepers)
|
|
{
|
|
assert(pid != -1); /* common mistake */
|
|
|
|
Children::iterator i = children.find(pid);
|
|
assert(i != children.end());
|
|
|
|
if (i->second.inBuildSlot) {
|
|
assert(nrLocalBuilds > 0);
|
|
nrLocalBuilds--;
|
|
}
|
|
|
|
children.erase(pid);
|
|
|
|
if (wakeSleepers) {
|
|
|
|
/* Wake up goals waiting for a build slot. */
|
|
foreach (WeakGoals::iterator, i, wantingToBuild) {
|
|
GoalPtr goal = i->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
|
|
wantingToBuild.insert(goal);
|
|
}
|
|
|
|
|
|
void Worker::waitForAnyGoal(GoalPtr goal)
|
|
{
|
|
debug("wait for any goal");
|
|
waitingForAnyGoal.insert(goal);
|
|
}
|
|
|
|
|
|
void Worker::waitForAWhile(GoalPtr goal)
|
|
{
|
|
debug("wait for a while");
|
|
waitingForAWhile.insert(goal);
|
|
}
|
|
|
|
|
|
void Worker::run(const Goals & _topGoals)
|
|
{
|
|
foreach (Goals::iterator, i, _topGoals) topGoals.insert(*i);
|
|
|
|
startNest(nest, lvlDebug, format("entered goal loop"));
|
|
|
|
while (1) {
|
|
|
|
checkInterrupt();
|
|
|
|
/* Call every wake goal. */
|
|
while (!awake.empty() && !topGoals.empty()) {
|
|
WeakGoals awake2(awake);
|
|
awake.clear();
|
|
foreach (WeakGoals::iterator, i, awake2) {
|
|
checkInterrupt();
|
|
GoalPtr goal = i->lock();
|
|
if (goal) goal->work();
|
|
if (topGoals.empty()) break;
|
|
}
|
|
}
|
|
|
|
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;
|
|
time_t before = time(0);
|
|
|
|
/* 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. */
|
|
assert(sizeof(time_t) >= sizeof(long));
|
|
time_t nearest = LONG_MAX; // nearest deadline
|
|
foreach (Children::iterator, i, children) {
|
|
if (!i->second.respectTimeouts) continue;
|
|
if (settings.maxSilentTime != 0)
|
|
nearest = std::min(nearest, i->second.lastOutput + settings.maxSilentTime);
|
|
if (settings.buildTimeout != 0)
|
|
nearest = std::min(nearest, i->second.timeStarted + settings.buildTimeout);
|
|
}
|
|
if (nearest != LONG_MAX) {
|
|
timeout.tv_sec = std::max((time_t) 1, nearest - before);
|
|
useTimeout = true;
|
|
printMsg(lvlVomit, format("sleeping %1% seconds") % timeout.tv_sec);
|
|
}
|
|
|
|
/* 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 == 0)
|
|
printMsg(lvlError, "waiting for locks or build slots...");
|
|
if (lastWokenUp == 0 || lastWokenUp > before) lastWokenUp = before;
|
|
timeout.tv_sec = std::max((time_t) 1, (time_t) (lastWokenUp + settings.pollInterval - before));
|
|
} else lastWokenUp = 0;
|
|
|
|
using namespace std;
|
|
/* 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;
|
|
foreach (Children::iterator, i, children) {
|
|
foreach (set<int>::iterator, j, i->second.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");
|
|
}
|
|
|
|
time_t after = time(0);
|
|
|
|
/* Process all available file descriptors. */
|
|
|
|
/* Since goals may be canceled from inside the loop below (causing
|
|
them go be erased from the `children' map), we have to be
|
|
careful that we don't keep iterators alive across calls to
|
|
cancel(). */
|
|
set<pid_t> pids;
|
|
foreach (Children::iterator, i, children) pids.insert(i->first);
|
|
|
|
foreach (set<pid_t>::iterator, i, pids) {
|
|
checkInterrupt();
|
|
Children::iterator j = children.find(*i);
|
|
if (j == children.end()) continue; // child destroyed
|
|
GoalPtr goal = j->second.goal.lock();
|
|
assert(goal);
|
|
|
|
set<int> fds2(j->second.fds);
|
|
foreach (set<int>::iterator, 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->second.fds.erase(*k);
|
|
} else {
|
|
printMsg(lvlVomit, format("%1%: read %2% bytes")
|
|
% goal->getName() % rd);
|
|
string data((char *) buffer, rd);
|
|
goal->handleChildOutput(*k, data);
|
|
j->second.lastOutput = after;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (settings.maxSilentTime != 0 &&
|
|
j->second.respectTimeouts &&
|
|
after - j->second.lastOutput >= (time_t) settings.maxSilentTime)
|
|
{
|
|
printMsg(lvlError,
|
|
format("%1% timed out after %2% seconds of silence")
|
|
% goal->getName() % settings.maxSilentTime);
|
|
goal->cancel(true);
|
|
}
|
|
|
|
if (settings.buildTimeout != 0 &&
|
|
j->second.respectTimeouts &&
|
|
after - j->second.timeStarted >= (time_t) settings.buildTimeout)
|
|
{
|
|
printMsg(lvlError,
|
|
format("%1% timed out after %2% seconds")
|
|
% goal->getName() % settings.buildTimeout);
|
|
goal->cancel(true);
|
|
}
|
|
}
|
|
|
|
if (!waitingForAWhile.empty() && lastWokenUp + settings.pollInterval <= after) {
|
|
lastWokenUp = after;
|
|
foreach (WeakGoals::iterator, i, waitingForAWhile) {
|
|
GoalPtr goal = i->lock();
|
|
if (goal) wakeUp(goal);
|
|
}
|
|
waitingForAWhile.clear();
|
|
}
|
|
}
|
|
|
|
|
|
unsigned int Worker::exitStatus()
|
|
{
|
|
return permanentFailure ? 100 : 1;
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
void LocalStore::buildPaths(const PathSet & drvPaths, bool repair)
|
|
{
|
|
startNest(nest, lvlDebug,
|
|
format("building %1%") % showPaths(drvPaths));
|
|
|
|
Worker worker(*this);
|
|
|
|
Goals goals;
|
|
foreach (PathSet::const_iterator, i, drvPaths) {
|
|
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(*i);
|
|
if (isDerivation(i2.first))
|
|
goals.insert(worker.makeDerivationGoal(i2.first, i2.second, repair));
|
|
else
|
|
goals.insert(worker.makeSubstitutionGoal(*i, repair));
|
|
}
|
|
|
|
worker.run(goals);
|
|
|
|
PathSet failed;
|
|
foreach (Goals::iterator, i, goals)
|
|
if ((*i)->getExitCode() == Goal::ecFailed) {
|
|
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(format("build of %1% failed") % showPaths(failed), worker.exitStatus());
|
|
}
|
|
|
|
|
|
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 = singleton<Goals>(goal);
|
|
|
|
worker.run(goals);
|
|
|
|
if (goal->getExitCode() != Goal::ecSuccess)
|
|
throw Error(format("path `%1%' does not exist and cannot be created") % path, worker.exitStatus());
|
|
}
|
|
|
|
|
|
void LocalStore::repairPath(const Path & path)
|
|
{
|
|
Worker worker(*this);
|
|
GoalPtr goal = worker.makeSubstitutionGoal(path, true);
|
|
Goals goals = singleton<Goals>(goal);
|
|
|
|
worker.run(goals);
|
|
|
|
if (goal->getExitCode() != Goal::ecSuccess)
|
|
throw Error(format("cannot repair path `%1%'") % path, worker.exitStatus());
|
|
}
|
|
|
|
|
|
}
|