Trim hook-instance.hh
This commit is contained in:
John Ericson
parent
10b749a156
commit
d585b4c54f
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@ -1,760 +1,10 @@
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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 "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 "logging.hh"
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#include "serialise.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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/* A mapping used to remember for each child process to what goal it
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belongs, and file descriptors for receiving log data and output
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path creation commands. */
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struct Child
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{
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WeakGoalPtr goal;
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Goal * goal2; // ugly hackery
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set<int> fds;
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bool respectTimeouts;
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bool inBuildSlot;
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steady_time_point lastOutput; /* time we last got output on stdout/stderr */
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steady_time_point timeStarted;
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};
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/* The worker class. */
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class Worker
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{
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private:
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/* Note: the worker should only have strong pointers to the
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top-level goals. */
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/* The top-level goals of the worker. */
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Goals topGoals;
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/* Goals that are ready to do some work. */
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WeakGoals awake;
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/* Goals waiting for a build slot. */
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WeakGoals wantingToBuild;
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/* Child processes currently running. */
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std::list<Child> children;
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/* Number of build slots occupied. This includes local builds and
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substitutions but not remote builds via the build hook. */
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unsigned int nrLocalBuilds;
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/* Maps used to prevent multiple instantiations of a goal for the
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same derivation / path. */
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WeakGoalMap derivationGoals;
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WeakGoalMap substitutionGoals;
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/* Goals waiting for busy paths to be unlocked. */
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WeakGoals waitingForAnyGoal;
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/* Goals sleeping for a few seconds (polling a lock). */
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WeakGoals waitingForAWhile;
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/* Last time the goals in `waitingForAWhile' where woken up. */
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steady_time_point lastWokenUp;
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/* Cache for pathContentsGood(). */
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std::map<StorePath, bool> pathContentsGoodCache;
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public:
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const Activity act;
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const Activity actDerivations;
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const Activity actSubstitutions;
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/* Set if at least one derivation had a BuildError (i.e. permanent
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failure). */
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bool permanentFailure;
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/* Set if at least one derivation had a timeout. */
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bool timedOut;
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/* Set if at least one derivation fails with a hash mismatch. */
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bool hashMismatch;
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/* Set if at least one derivation is not deterministic in check mode. */
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bool checkMismatch;
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LocalStore & store;
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std::unique_ptr<HookInstance> hook;
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uint64_t expectedBuilds = 0;
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uint64_t doneBuilds = 0;
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uint64_t failedBuilds = 0;
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uint64_t runningBuilds = 0;
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uint64_t expectedSubstitutions = 0;
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uint64_t doneSubstitutions = 0;
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uint64_t failedSubstitutions = 0;
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uint64_t runningSubstitutions = 0;
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uint64_t expectedDownloadSize = 0;
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uint64_t doneDownloadSize = 0;
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uint64_t expectedNarSize = 0;
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uint64_t doneNarSize = 0;
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/* Whether to ask the build hook if it can build a derivation. If
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it answers with "decline-permanently", we don't try again. */
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bool tryBuildHook = true;
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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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/* derivation goal */
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private:
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std::shared_ptr<DerivationGoal> makeDerivationGoalCommon(
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const StorePath & drvPath, const StringSet & wantedOutputs,
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std::function<std::shared_ptr<DerivationGoal>()> mkDrvGoal);
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public:
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std::shared_ptr<DerivationGoal> makeDerivationGoal(
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const StorePath & drvPath,
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const StringSet & wantedOutputs, BuildMode buildMode = bmNormal);
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std::shared_ptr<DerivationGoal> makeBasicDerivationGoal(
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const StorePath & drvPath, const BasicDerivation & drv,
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const StringSet & wantedOutputs, BuildMode buildMode = bmNormal);
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/* substitution goal */
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GoalPtr makeSubstitutionGoal(const StorePath & storePath, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
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/* Remove a dead goal. */
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void removeGoal(GoalPtr goal);
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/* Wake up a goal (i.e., there is something for it to do). */
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void wakeUp(GoalPtr goal);
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/* Return the number of local build and substitution processes
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currently running (but not remote builds via the build
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hook). */
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unsigned int getNrLocalBuilds();
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/* Registers a running child process. `inBuildSlot' means that
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the process counts towards the jobs limit. */
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void childStarted(GoalPtr goal, const set<int> & fds,
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bool inBuildSlot, bool respectTimeouts);
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/* Unregisters a running child process. `wakeSleepers' should be
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false if there is no sense in waking up goals that are sleeping
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because they can't run yet (e.g., there is no free build slot,
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or the hook would still say `postpone'). */
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void childTerminated(Goal * goal, bool wakeSleepers = true);
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/* Put `goal' to sleep until a build slot becomes available (which
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might be right away). */
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void waitForBuildSlot(GoalPtr goal);
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/* Wait for any goal to finish. Pretty indiscriminate way to
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wait for some resource that some other goal is holding. */
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void waitForAnyGoal(GoalPtr goal);
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/* Wait for a few seconds and then retry this goal. Used when
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waiting for a lock held by another process. This kind of
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polling is inefficient, but POSIX doesn't really provide a way
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to wait for multiple locks in the main select() loop. */
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void waitForAWhile(GoalPtr goal);
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/* Loop until the specified top-level goals have finished. */
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void run(const Goals & topGoals);
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/* Wait for input to become available. */
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void waitForInput();
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unsigned int exitStatus();
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/* Check whether the given valid path exists and has the right
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contents. */
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bool pathContentsGood(const StorePath & path);
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void markContentsGood(const StorePath & path);
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void updateProgress()
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{
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actDerivations.progress(doneBuilds, expectedBuilds + doneBuilds, runningBuilds, failedBuilds);
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actSubstitutions.progress(doneSubstitutions, expectedSubstitutions + doneSubstitutions, runningSubstitutions, failedSubstitutions);
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act.setExpected(actFileTransfer, expectedDownloadSize + doneDownloadSize);
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act.setExpected(actCopyPath, expectedNarSize + doneNarSize);
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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
|
||||
in the original input closure or added via a recursive Nix call
|
||||
(so e.g. you can't do 'nix-store -r /nix/store/<bla>' where
|
||||
/nix/store/<bla> is some arbitrary path in a binary cache). */
|
||||
bool isAllowed(const StorePath & path)
|
||||
{
|
||||
return inputPaths.count(path) || addedPaths.count(path);
|
||||
}
|
||||
|
||||
friend struct RestrictedStore;
|
||||
|
||||
public:
|
||||
DerivationGoal(const StorePath & drvPath,
|
||||
const StringSet & wantedOutputs, Worker & worker,
|
||||
BuildMode buildMode = bmNormal);
|
||||
DerivationGoal(const StorePath & drvPath, const BasicDerivation & drv,
|
||||
const StringSet & wantedOutputs, Worker & worker,
|
||||
BuildMode buildMode = bmNormal);
|
||||
~DerivationGoal();
|
||||
|
||||
/* Whether we need to perform hash rewriting if there are valid output paths. */
|
||||
bool needsHashRewrite();
|
||||
|
||||
void timedOut(Error && ex) override;
|
||||
|
||||
string key() override
|
||||
{
|
||||
/* Ensure that derivations get built in order of their name,
|
||||
i.e. a derivation named "aardvark" always comes before
|
||||
"baboon". And substitution goals always happen before
|
||||
derivation goals (due to "b$"). */
|
||||
return "b$" + std::string(drvPath.name()) + "$" + worker.store.printStorePath(drvPath);
|
||||
}
|
||||
|
||||
void work() override;
|
||||
|
||||
StorePath getDrvPath()
|
||||
{
|
||||
return drvPath;
|
||||
}
|
||||
|
||||
/* Add wanted outputs to an already existing derivation goal. */
|
||||
void addWantedOutputs(const StringSet & outputs);
|
||||
|
||||
BuildResult getResult() { return result; }
|
||||
|
||||
private:
|
||||
/* The states. */
|
||||
void getDerivation();
|
||||
void loadDerivation();
|
||||
void haveDerivation();
|
||||
void outputsSubstitutionTried();
|
||||
void gaveUpOnSubstitution();
|
||||
void closureRepaired();
|
||||
void inputsRealised();
|
||||
void tryToBuild();
|
||||
void tryLocalBuild();
|
||||
void buildDone();
|
||||
|
||||
void resolvedFinished();
|
||||
|
||||
/* Is the build hook willing to perform the build? */
|
||||
HookReply tryBuildHook();
|
||||
|
||||
/* Start building a derivation. */
|
||||
void startBuilder();
|
||||
|
||||
/* Fill in the environment for the builder. */
|
||||
void initEnv();
|
||||
|
||||
/* Setup tmp dir location. */
|
||||
void initTmpDir();
|
||||
|
||||
/* Write a JSON file containing the derivation attributes. */
|
||||
void writeStructuredAttrs();
|
||||
|
||||
void startDaemon();
|
||||
|
||||
void stopDaemon();
|
||||
|
||||
/* Add 'path' to the set of paths that may be referenced by the
|
||||
outputs, and make it appear in the sandbox. */
|
||||
void addDependency(const StorePath & path);
|
||||
|
||||
/* Make a file owned by the builder. */
|
||||
void chownToBuilder(const Path & path);
|
||||
|
||||
/* Run the builder's process. */
|
||||
void runChild();
|
||||
|
||||
friend int childEntry(void *);
|
||||
|
||||
/* Check that the derivation outputs all exist and register them
|
||||
as valid. */
|
||||
void registerOutputs();
|
||||
|
||||
/* Check that an output meets the requirements specified by the
|
||||
'outputChecks' attribute (or the legacy
|
||||
'{allowed,disallowed}{References,Requisites}' attributes). */
|
||||
void checkOutputs(const std::map<std::string, ValidPathInfo> & outputs);
|
||||
|
||||
/* Open a log file and a pipe to it. */
|
||||
Path openLogFile();
|
||||
|
||||
/* Close the log file. */
|
||||
void closeLogFile();
|
||||
|
||||
/* Delete the temporary directory, if we have one. */
|
||||
void deleteTmpDir(bool force);
|
||||
|
||||
/* Callback used by the worker to write to the log. */
|
||||
void handleChildOutput(int fd, const string & data) override;
|
||||
void handleEOF(int fd) override;
|
||||
void flushLine();
|
||||
|
||||
/* Wrappers around the corresponding Store methods that first consult the
|
||||
derivation. This is currently needed because when there is no drv file
|
||||
there also is no DB entry. */
|
||||
std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap();
|
||||
OutputPathMap queryDerivationOutputMap();
|
||||
|
||||
/* Return the set of (in)valid paths. */
|
||||
void checkPathValidity();
|
||||
|
||||
/* Forcibly kill the child process, if any. */
|
||||
void killChild();
|
||||
|
||||
/* Create alternative path calculated from but distinct from the
|
||||
input, so we can avoid overwriting outputs (or other store paths)
|
||||
that already exist. */
|
||||
StorePath makeFallbackPath(const StorePath & path);
|
||||
/* Make a path to another based on the output name along with the
|
||||
derivation hash. */
|
||||
/* FIXME add option to randomize, so we can audit whether our
|
||||
rewrites caught everything */
|
||||
StorePath makeFallbackPath(std::string_view outputName);
|
||||
|
||||
void repairClosure();
|
||||
|
||||
void started();
|
||||
|
||||
void done(
|
||||
BuildResult::Status status,
|
||||
std::optional<Error> ex = {});
|
||||
|
||||
StorePathSet exportReferences(const StorePathSet & storePaths);
|
||||
};
|
||||
|
||||
class SubstitutionGoal : public Goal
|
||||
{
|
||||
friend class Worker;
|
||||
|
||||
private:
|
||||
/* The store path that should be realised through a substitute. */
|
||||
StorePath storePath;
|
||||
|
||||
/* The path the substituter refers to the path as. This will be
|
||||
* different when the stores have different names. */
|
||||
std::optional<StorePath> subPath;
|
||||
|
||||
/* The remaining substituters. */
|
||||
std::list<ref<Store>> subs;
|
||||
|
||||
/* The current substituter. */
|
||||
std::shared_ptr<Store> sub;
|
||||
|
||||
/* Whether a substituter failed. */
|
||||
bool substituterFailed = false;
|
||||
|
||||
/* Path info returned by the substituter's query info operation. */
|
||||
std::shared_ptr<const ValidPathInfo> info;
|
||||
|
||||
/* Pipe for the substituter's standard output. */
|
||||
Pipe outPipe;
|
||||
|
||||
/* The substituter thread. */
|
||||
std::thread thr;
|
||||
|
||||
std::promise<void> promise;
|
||||
|
||||
/* Whether to try to repair a valid path. */
|
||||
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. */
|
||||
|
|
@ -778,7 +28,4 @@ struct HookInstance
|
|||
~HookInstance();
|
||||
};
|
||||
|
||||
|
||||
void addToWeakGoals(WeakGoals & goals, GoalPtr p);
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue