forked from lix-project/lix
Trim worker.hh
This commit is contained in:
John Ericson
parent
0e2306204a
commit
542972f029
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@ -1,127 +1,14 @@
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#pragma once
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#include "machines.hh"
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#include "parsed-derivations.hh"
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#include "types.hh"
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#include "lock.hh"
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#include "local-store.hh"
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#include <memory>
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#include <algorithm>
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#include <iostream>
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#include <map>
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#include <sstream>
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#include <thread>
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#include <future>
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#include <chrono>
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#include <regex>
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#include <queue>
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#include "goal.hh"
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namespace nix {
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using std::map;
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/* Forward definition. */
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class Worker;
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struct HookInstance;
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/* A pointer to a goal. */
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struct Goal;
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class DerivationGoal;
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typedef std::shared_ptr<Goal> GoalPtr;
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typedef std::weak_ptr<Goal> WeakGoalPtr;
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struct CompareGoalPtrs {
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bool operator() (const GoalPtr & a, const GoalPtr & b) const;
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};
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/* Set of goals. */
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typedef set<GoalPtr, CompareGoalPtrs> Goals;
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typedef list<WeakGoalPtr> WeakGoals;
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/* A map of paths to goals (and the other way around). */
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typedef std::map<StorePath, WeakGoalPtr> WeakGoalMap;
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struct Goal : public std::enable_shared_from_this<Goal>
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{
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typedef enum {ecBusy, ecSuccess, ecFailed, ecNoSubstituters, ecIncompleteClosure} ExitCode;
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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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/* Exception containing an error message, if any. */
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std::optional<Error> ex;
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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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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 FormatOrString & fs);
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string getName()
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{
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return name;
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}
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/* Callback in case of a timeout. It should wake up its waiters,
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get rid of any running child processes that are being monitored
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by the worker (important!), etc. */
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virtual void timedOut(Error && ex) = 0;
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virtual string key() = 0;
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void amDone(ExitCode result, std::optional<Error> ex = {});
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};
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typedef std::chrono::time_point<std::chrono::steady_clock> steady_time_point;
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@ -140,6 +27,8 @@ struct Child
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steady_time_point timeStarted;
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};
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/* Forward definition. */
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struct HookInstance;
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/* The worker class. */
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class Worker
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@ -303,482 +192,4 @@ public:
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}
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};
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typedef enum {rpAccept, rpDecline, rpPostpone} HookReply;
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class SubstitutionGoal;
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/* Unless we are repairing, we don't both to test validity and just assume it,
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so the choices are `Absent` or `Valid`. */
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enum struct PathStatus {
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Corrupt,
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Absent,
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Valid,
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};
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struct InitialOutputStatus {
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StorePath path;
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PathStatus status;
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/* Valid in the store, and additionally non-corrupt if we are repairing */
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bool isValid() const {
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return status == PathStatus::Valid;
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}
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/* Merely present, allowed to be corrupt */
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bool isPresent() const {
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return status == PathStatus::Corrupt
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|| status == PathStatus::Valid;
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}
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};
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struct InitialOutput {
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bool wanted;
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std::optional<InitialOutputStatus> known;
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};
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class DerivationGoal : public Goal
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{
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private:
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/* Whether to use an on-disk .drv file. */
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bool useDerivation;
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/* The path of the derivation. */
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StorePath drvPath;
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/* The specific outputs that we need to build. Empty means all of
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them. */
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StringSet wantedOutputs;
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/* Whether additional wanted outputs have been added. */
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bool needRestart = false;
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/* Whether to retry substituting the outputs after building the
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inputs. */
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bool retrySubstitution;
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/* The derivation stored at drvPath. */
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std::unique_ptr<BasicDerivation> drv;
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std::unique_ptr<ParsedDerivation> parsedDrv;
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/* The remainder is state held during the build. */
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/* Locks on (fixed) output paths. */
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PathLocks outputLocks;
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/* All input paths (that is, the union of FS closures of the
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immediate input paths). */
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StorePathSet inputPaths;
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std::map<std::string, InitialOutput> initialOutputs;
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/* User selected for running the builder. */
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std::unique_ptr<UserLock> buildUser;
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/* The process ID of the builder. */
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Pid pid;
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/* The temporary directory. */
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Path tmpDir;
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/* The path of the temporary directory in the sandbox. */
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Path tmpDirInSandbox;
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/* File descriptor for the log file. */
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AutoCloseFD fdLogFile;
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std::shared_ptr<BufferedSink> logFileSink, logSink;
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/* Number of bytes received from the builder's stdout/stderr. */
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unsigned long logSize;
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/* The most recent log lines. */
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std::list<std::string> logTail;
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std::string currentLogLine;
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size_t currentLogLinePos = 0; // to handle carriage return
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std::string currentHookLine;
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/* Pipe for the builder's standard output/error. */
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Pipe builderOut;
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/* Pipe for synchronising updates to the builder namespaces. */
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Pipe userNamespaceSync;
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/* The mount namespace of the builder, used to add additional
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paths to the sandbox as a result of recursive Nix calls. */
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AutoCloseFD sandboxMountNamespace;
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/* On Linux, whether we're doing the build in its own user
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namespace. */
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bool usingUserNamespace = true;
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/* The build hook. */
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std::unique_ptr<HookInstance> hook;
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/* Whether we're currently doing a chroot build. */
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bool useChroot = false;
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Path chrootRootDir;
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/* RAII object to delete the chroot directory. */
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std::shared_ptr<AutoDelete> autoDelChroot;
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/* The sort of derivation we are building. */
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DerivationType derivationType;
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/* Whether to run the build in a private network namespace. */
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bool privateNetwork = false;
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typedef void (DerivationGoal::*GoalState)();
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GoalState state;
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/* Stuff we need to pass to initChild(). */
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struct ChrootPath {
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Path source;
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bool optional;
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ChrootPath(Path source = "", bool optional = false)
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: source(source), optional(optional)
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{ }
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};
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typedef map<Path, ChrootPath> DirsInChroot; // maps target path to source path
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DirsInChroot dirsInChroot;
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typedef map<string, string> Environment;
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Environment env;
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#if __APPLE__
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typedef string SandboxProfile;
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SandboxProfile additionalSandboxProfile;
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#endif
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/* Hash rewriting. */
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StringMap inputRewrites, outputRewrites;
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typedef map<StorePath, StorePath> RedirectedOutputs;
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RedirectedOutputs redirectedOutputs;
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/* The outputs paths used during the build.
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- Input-addressed derivations or fixed content-addressed outputs are
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sometimes built when some of their outputs already exist, and can not
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be hidden via sandboxing. We use temporary locations instead and
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rewrite after the build. Otherwise the regular predetermined paths are
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put here.
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- Floating content-addressed derivations do not know their final build
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output paths until the outputs are hashed, so random locations are
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used, and then renamed. The randomness helps guard against hidden
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self-references.
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*/
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OutputPathMap scratchOutputs;
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/* The final output paths of the build.
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- For input-addressed derivations, always the precomputed paths
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- For content-addressed derivations, calcuated from whatever the hash
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ends up being. (Note that fixed outputs derivations that produce the
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"wrong" output still install that data under its true content-address.)
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*/
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OutputPathMap finalOutputs;
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BuildMode buildMode;
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/* If we're repairing without a chroot, there may be outputs that
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are valid but corrupt. So we redirect these outputs to
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temporary paths. */
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StorePathSet redirectedBadOutputs;
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BuildResult result;
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/* The current round, if we're building multiple times. */
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size_t curRound = 1;
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size_t nrRounds;
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/* Path registration info from the previous round, if we're
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building multiple times. Since this contains the hash, it
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allows us to compare whether two rounds produced the same
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result. */
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std::map<Path, ValidPathInfo> prevInfos;
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uid_t sandboxUid() { return usingUserNamespace ? 1000 : buildUser->getUID(); }
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gid_t sandboxGid() { return usingUserNamespace ? 100 : buildUser->getGID(); }
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const static Path homeDir;
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std::unique_ptr<MaintainCount<uint64_t>> mcExpectedBuilds, mcRunningBuilds;
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std::unique_ptr<Activity> act;
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/* Activity that denotes waiting for a lock. */
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std::unique_ptr<Activity> actLock;
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std::map<ActivityId, Activity> builderActivities;
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/* The remote machine on which we're building. */
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std::string machineName;
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/* The recursive Nix daemon socket. */
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AutoCloseFD daemonSocket;
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/* The daemon main thread. */
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std::thread daemonThread;
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/* The daemon worker threads. */
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std::vector<std::thread> daemonWorkerThreads;
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/* Paths that were added via recursive Nix calls. */
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StorePathSet addedPaths;
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/* Recursive Nix calls are only allowed to build or realize paths
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in the original input closure or added via a recursive Nix call
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(so e.g. you can't do 'nix-store -r /nix/store/<bla>' where
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/nix/store/<bla> is some arbitrary path in a binary cache). */
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bool isAllowed(const StorePath & path)
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{
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return inputPaths.count(path) || addedPaths.count(path);
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}
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friend struct RestrictedStore;
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public:
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DerivationGoal(const StorePath & drvPath,
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const StringSet & wantedOutputs, Worker & worker,
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BuildMode buildMode = bmNormal);
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DerivationGoal(const StorePath & drvPath, const BasicDerivation & drv,
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const StringSet & wantedOutputs, Worker & worker,
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BuildMode buildMode = bmNormal);
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~DerivationGoal();
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/* Whether we need to perform hash rewriting if there are valid output paths. */
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bool needsHashRewrite();
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void timedOut(Error && ex) override;
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string key() override
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{
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/* Ensure that derivations get built in order of their name,
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i.e. a derivation named "aardvark" always comes before
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"baboon". And substitution goals always happen before
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derivation goals (due to "b$"). */
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return "b$" + std::string(drvPath.name()) + "$" + worker.store.printStorePath(drvPath);
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}
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void work() override;
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StorePath getDrvPath()
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{
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return drvPath;
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}
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/* Add wanted outputs to an already existing derivation goal. */
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void addWantedOutputs(const StringSet & outputs);
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BuildResult getResult() { return result; }
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private:
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/* The states. */
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void getDerivation();
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void loadDerivation();
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void haveDerivation();
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void outputsSubstitutionTried();
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void gaveUpOnSubstitution();
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void closureRepaired();
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void inputsRealised();
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void tryToBuild();
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void tryLocalBuild();
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void buildDone();
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void resolvedFinished();
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/* Is the build hook willing to perform the build? */
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HookReply tryBuildHook();
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/* Start building a derivation. */
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void startBuilder();
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/* Fill in the environment for the builder. */
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void initEnv();
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/* Setup tmp dir location. */
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void initTmpDir();
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/* Write a JSON file containing the derivation attributes. */
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void writeStructuredAttrs();
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void startDaemon();
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void stopDaemon();
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/* Add 'path' to the set of paths that may be referenced by the
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outputs, and make it appear in the sandbox. */
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void addDependency(const StorePath & path);
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/* Make a file owned by the builder. */
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void chownToBuilder(const Path & path);
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/* Run the builder's process. */
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void runChild();
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friend int childEntry(void *);
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/* Check that the derivation outputs all exist and register them
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as valid. */
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void registerOutputs();
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/* Check that an output meets the requirements specified by the
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'outputChecks' attribute (or the legacy
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'{allowed,disallowed}{References,Requisites}' attributes). */
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void checkOutputs(const std::map<std::string, ValidPathInfo> & outputs);
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/* Open a log file and a pipe to it. */
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Path openLogFile();
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/* Close the log file. */
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void closeLogFile();
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/* Delete the temporary directory, if we have one. */
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void deleteTmpDir(bool force);
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/* Callback used by the worker to write to the log. */
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void handleChildOutput(int fd, const string & data) override;
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void handleEOF(int fd) override;
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void flushLine();
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/* Wrappers around the corresponding Store methods that first consult the
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derivation. This is currently needed because when there is no drv file
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there also is no DB entry. */
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std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap();
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OutputPathMap queryDerivationOutputMap();
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/* Return the set of (in)valid paths. */
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void checkPathValidity();
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/* Forcibly kill the child process, if any. */
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void killChild();
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/* Create alternative path calculated from but distinct from the
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input, so we can avoid overwriting outputs (or other store paths)
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that already exist. */
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StorePath makeFallbackPath(const StorePath & path);
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/* Make a path to another based on the output name along with the
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derivation hash. */
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/* FIXME add option to randomize, so we can audit whether our
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rewrites caught everything */
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StorePath makeFallbackPath(std::string_view outputName);
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void repairClosure();
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void started();
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void done(
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BuildResult::Status status,
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std::optional<Error> ex = {});
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StorePathSet exportReferences(const StorePathSet & storePaths);
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};
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class SubstitutionGoal : public Goal
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{
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friend class Worker;
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private:
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/* The store path that should be realised through a substitute. */
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StorePath storePath;
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/* The path the substituter refers to the path as. This will be
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* different when the stores have different names. */
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std::optional<StorePath> subPath;
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/* The remaining substituters. */
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std::list<ref<Store>> subs;
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/* The current substituter. */
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std::shared_ptr<Store> sub;
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/* Whether a substituter failed. */
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bool substituterFailed = false;
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/* Path info returned by the substituter's query info operation. */
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std::shared_ptr<const ValidPathInfo> info;
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/* Pipe for the substituter's standard output. */
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Pipe outPipe;
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/* The substituter thread. */
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std::thread thr;
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std::promise<void> promise;
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/* Whether to try to repair a valid path. */
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RepairFlag repair;
|
||||
|
||||
/* Location where we're downloading the substitute. Differs from
|
||||
storePath when doing a repair. */
|
||||
Path destPath;
|
||||
|
||||
std::unique_ptr<MaintainCount<uint64_t>> maintainExpectedSubstitutions,
|
||||
maintainRunningSubstitutions, maintainExpectedNar, maintainExpectedDownload;
|
||||
|
||||
typedef void (SubstitutionGoal::*GoalState)();
|
||||
GoalState state;
|
||||
|
||||
/* Content address for recomputing store path */
|
||||
std::optional<ContentAddress> ca;
|
||||
|
||||
public:
|
||||
SubstitutionGoal(const StorePath & storePath, Worker & worker, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
|
||||
~SubstitutionGoal();
|
||||
|
||||
void timedOut(Error && ex) override { abort(); };
|
||||
|
||||
string key() override
|
||||
{
|
||||
/* "a$" ensures substitution goals happen before derivation
|
||||
goals. */
|
||||
return "a$" + std::string(storePath.name()) + "$" + worker.store.printStorePath(storePath);
|
||||
}
|
||||
|
||||
void work() override;
|
||||
|
||||
/* 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) override;
|
||||
void handleEOF(int fd) override;
|
||||
|
||||
StorePath getStorePath() { return storePath; }
|
||||
};
|
||||
|
||||
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;
|
||||
|
||||
FdSink sink;
|
||||
|
||||
std::map<ActivityId, Activity> activities;
|
||||
|
||||
HookInstance();
|
||||
|
||||
~HookInstance();
|
||||
};
|
||||
|
||||
|
||||
void addToWeakGoals(WeakGoals & goals, GoalPtr p);
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue