diff --git a/src/libstore/build/worker.hh b/src/libstore/build/worker.hh index 8027c61b1..a54316343 100644 --- a/src/libstore/build/worker.hh +++ b/src/libstore/build/worker.hh @@ -1,127 +1,14 @@ #pragma once -#include "machines.hh" -#include "parsed-derivations.hh" +#include "types.hh" #include "lock.hh" #include "local-store.hh" - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include +#include "goal.hh" namespace nix { -using std::map; - - /* Forward definition. */ -class Worker; -struct HookInstance; - - -/* A pointer to a goal. */ -struct Goal; class DerivationGoal; -typedef std::shared_ptr GoalPtr; -typedef std::weak_ptr WeakGoalPtr; - -struct CompareGoalPtrs { - bool operator() (const GoalPtr & a, const GoalPtr & b) const; -}; - -/* Set of goals. */ -typedef set Goals; -typedef list WeakGoals; - -/* A map of paths to goals (and the other way around). */ -typedef std::map WeakGoalMap; - - - -struct Goal : public std::enable_shared_from_this -{ - typedef enum {ecBusy, ecSuccess, ecFailed, ecNoSubstituters, ecIncompleteClosure} ExitCode; - - /* Backlink to the worker. */ - Worker & worker; - - /* Goals that this goal is waiting for. */ - Goals waitees; - - /* Goals waiting for this one to finish. Must use weak pointers - here to prevent cycles. */ - WeakGoals waiters; - - /* Number of goals we are/were waiting for that have failed. */ - unsigned int nrFailed; - - /* Number of substitution goals we are/were waiting for that - failed because there are no substituters. */ - unsigned int nrNoSubstituters; - - /* Number of substitution goals we are/were waiting for that - failed because othey had unsubstitutable references. */ - unsigned int nrIncompleteClosure; - - /* Name of this goal for debugging purposes. */ - string name; - - /* Whether the goal is finished. */ - ExitCode exitCode; - - /* Exception containing an error message, if any. */ - std::optional ex; - - Goal(Worker & worker) : worker(worker) - { - nrFailed = nrNoSubstituters = nrIncompleteClosure = 0; - exitCode = ecBusy; - } - - virtual ~Goal() - { - trace("goal destroyed"); - } - - virtual void work() = 0; - - void addWaitee(GoalPtr waitee); - - virtual void waiteeDone(GoalPtr waitee, ExitCode result); - - virtual void handleChildOutput(int fd, const string & data) - { - abort(); - } - - virtual void handleEOF(int fd) - { - abort(); - } - - void trace(const FormatOrString & fs); - - string getName() - { - return name; - } - - /* Callback in case of a timeout. It should wake up its waiters, - get rid of any running child processes that are being monitored - by the worker (important!), etc. */ - virtual void timedOut(Error && ex) = 0; - - virtual string key() = 0; - - void amDone(ExitCode result, std::optional ex = {}); -}; typedef std::chrono::time_point steady_time_point; @@ -140,6 +27,8 @@ struct Child steady_time_point timeStarted; }; +/* Forward definition. */ +struct HookInstance; /* The worker class. */ class Worker @@ -303,482 +192,4 @@ public: } }; -typedef enum {rpAccept, rpDecline, rpPostpone} HookReply; - -class SubstitutionGoal; - -/* Unless we are repairing, we don't both to test validity and just assume it, - so the choices are `Absent` or `Valid`. */ -enum struct PathStatus { - Corrupt, - Absent, - Valid, -}; - -struct InitialOutputStatus { - StorePath path; - PathStatus status; - /* Valid in the store, and additionally non-corrupt if we are repairing */ - bool isValid() const { - return status == PathStatus::Valid; - } - /* Merely present, allowed to be corrupt */ - bool isPresent() const { - return status == PathStatus::Corrupt - || status == PathStatus::Valid; - } -}; - -struct InitialOutput { - bool wanted; - std::optional known; -}; - -class DerivationGoal : public Goal -{ -private: - /* Whether to use an on-disk .drv file. */ - bool useDerivation; - - /* The path of the derivation. */ - StorePath drvPath; - - /* The specific outputs that we need to build. Empty means all of - them. */ - StringSet wantedOutputs; - - /* Whether additional wanted outputs have been added. */ - bool needRestart = false; - - /* Whether to retry substituting the outputs after building the - inputs. */ - bool retrySubstitution; - - /* The derivation stored at drvPath. */ - std::unique_ptr drv; - - std::unique_ptr parsedDrv; - - /* The remainder is state held during the build. */ - - /* Locks on (fixed) output paths. */ - PathLocks outputLocks; - - /* All input paths (that is, the union of FS closures of the - immediate input paths). */ - StorePathSet inputPaths; - - std::map initialOutputs; - - /* User selected for running the builder. */ - std::unique_ptr buildUser; - - /* The process ID of the builder. */ - Pid pid; - - /* The temporary directory. */ - Path tmpDir; - - /* The path of the temporary directory in the sandbox. */ - Path tmpDirInSandbox; - - /* File descriptor for the log file. */ - AutoCloseFD fdLogFile; - std::shared_ptr logFileSink, logSink; - - /* Number of bytes received from the builder's stdout/stderr. */ - unsigned long logSize; - - /* The most recent log lines. */ - std::list logTail; - - std::string currentLogLine; - size_t currentLogLinePos = 0; // to handle carriage return - - std::string currentHookLine; - - /* Pipe for the builder's standard output/error. */ - Pipe builderOut; - - /* Pipe for synchronising updates to the builder namespaces. */ - Pipe userNamespaceSync; - - /* The mount namespace of the builder, used to add additional - paths to the sandbox as a result of recursive Nix calls. */ - AutoCloseFD sandboxMountNamespace; - - /* On Linux, whether we're doing the build in its own user - namespace. */ - bool usingUserNamespace = true; - - /* The build hook. */ - std::unique_ptr hook; - - /* Whether we're currently doing a chroot build. */ - bool useChroot = false; - - Path chrootRootDir; - - /* RAII object to delete the chroot directory. */ - std::shared_ptr autoDelChroot; - - /* The sort of derivation we are building. */ - DerivationType derivationType; - - /* Whether to run the build in a private network namespace. */ - bool privateNetwork = false; - - typedef void (DerivationGoal::*GoalState)(); - GoalState state; - - /* Stuff we need to pass to initChild(). */ - struct ChrootPath { - Path source; - bool optional; - ChrootPath(Path source = "", bool optional = false) - : source(source), optional(optional) - { } - }; - typedef map DirsInChroot; // maps target path to source path - DirsInChroot dirsInChroot; - - typedef map Environment; - Environment env; - -#if __APPLE__ - typedef string SandboxProfile; - SandboxProfile additionalSandboxProfile; -#endif - - /* Hash rewriting. */ - StringMap inputRewrites, outputRewrites; - typedef map RedirectedOutputs; - RedirectedOutputs redirectedOutputs; - - /* The outputs paths used during the build. - - - Input-addressed derivations or fixed content-addressed outputs are - sometimes built when some of their outputs already exist, and can not - be hidden via sandboxing. We use temporary locations instead and - rewrite after the build. Otherwise the regular predetermined paths are - put here. - - - Floating content-addressed derivations do not know their final build - output paths until the outputs are hashed, so random locations are - used, and then renamed. The randomness helps guard against hidden - self-references. - */ - OutputPathMap scratchOutputs; - - /* The final output paths of the build. - - - For input-addressed derivations, always the precomputed paths - - - For content-addressed derivations, calcuated from whatever the hash - ends up being. (Note that fixed outputs derivations that produce the - "wrong" output still install that data under its true content-address.) - */ - OutputPathMap finalOutputs; - - BuildMode buildMode; - - /* If we're repairing without a chroot, there may be outputs that - are valid but corrupt. So we redirect these outputs to - temporary paths. */ - StorePathSet redirectedBadOutputs; - - BuildResult result; - - /* The current round, if we're building multiple times. */ - size_t curRound = 1; - - size_t nrRounds; - - /* Path registration info from the previous round, if we're - building multiple times. Since this contains the hash, it - allows us to compare whether two rounds produced the same - result. */ - std::map prevInfos; - - uid_t sandboxUid() { return usingUserNamespace ? 1000 : buildUser->getUID(); } - gid_t sandboxGid() { return usingUserNamespace ? 100 : buildUser->getGID(); } - - const static Path homeDir; - - std::unique_ptr> mcExpectedBuilds, mcRunningBuilds; - - std::unique_ptr act; - - /* Activity that denotes waiting for a lock. */ - std::unique_ptr actLock; - - std::map builderActivities; - - /* The remote machine on which we're building. */ - std::string machineName; - - /* The recursive Nix daemon socket. */ - AutoCloseFD daemonSocket; - - /* The daemon main thread. */ - std::thread daemonThread; - - /* The daemon worker threads. */ - std::vector daemonWorkerThreads; - - /* Paths that were added via recursive Nix calls. */ - StorePathSet addedPaths; - - /* 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/' where - /nix/store/ 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 & 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> 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 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 subPath; - - /* The remaining substituters. */ - std::list> subs; - - /* The current substituter. */ - std::shared_ptr sub; - - /* Whether a substituter failed. */ - bool substituterFailed = false; - - /* Path info returned by the substituter's query info operation. */ - std::shared_ptr info; - - /* Pipe for the substituter's standard output. */ - Pipe outPipe; - - /* The substituter thread. */ - std::thread thr; - - std::promise 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> maintainExpectedSubstitutions, - maintainRunningSubstitutions, maintainExpectedNar, maintainExpectedDownload; - - typedef void (SubstitutionGoal::*GoalState)(); - GoalState state; - - /* Content address for recomputing store path */ - std::optional ca; - -public: - SubstitutionGoal(const StorePath & storePath, Worker & worker, RepairFlag repair = NoRepair, std::optional 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 activities; - - HookInstance(); - - ~HookInstance(); -}; - - -void addToWeakGoals(WeakGoals & goals, GoalPtr p); - }