forked from lix-project/lix
858 lines
32 KiB
C++
858 lines
32 KiB
C++
#pragma once
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#include "realisation.hh"
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#include "path.hh"
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#include "hash.hh"
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#include "content-address.hh"
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#include "serialise.hh"
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#include "lru-cache.hh"
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#include "sync.hh"
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#include "globals.hh"
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#include "config.hh"
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#include "derivations.hh"
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#include "path-info.hh"
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#include <atomic>
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#include <limits>
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#include <map>
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#include <unordered_map>
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#include <unordered_set>
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#include <memory>
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#include <string>
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#include <chrono>
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#include <variant>
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namespace nix {
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/**
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* About the class hierarchy of the store implementations:
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*
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* Each store type `Foo` consists of two classes:
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*
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* 1. A class `FooConfig : virtual StoreConfig` that contains the configuration
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* for the store
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*
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* It should only contain members of type `const Setting<T>` (or subclasses
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* of it) and inherit the constructors of `StoreConfig`
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* (`using StoreConfig::StoreConfig`).
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*
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* 2. A class `Foo : virtual Store, virtual FooConfig` that contains the
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* implementation of the store.
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*
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* This class is expected to have a constructor `Foo(const Params & params)`
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* that calls `StoreConfig(params)` (otherwise you're gonna encounter an
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* `assertion failure` when trying to instantiate it).
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*
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* You can then register the new store using:
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*
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* ```
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* cpp static RegisterStoreImplementation<Foo, FooConfig> regStore;
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* ```
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*/
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MakeError(SubstError, Error);
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MakeError(BuildError, Error); // denotes a permanent build failure
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MakeError(InvalidPath, Error);
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MakeError(Unsupported, Error);
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MakeError(SubstituteGone, Error);
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MakeError(SubstituterDisabled, Error);
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MakeError(BadStorePath, Error);
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MakeError(InvalidStoreURI, Error);
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class FSAccessor;
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class NarInfoDiskCache;
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class Store;
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class JSONPlaceholder;
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enum CheckSigsFlag : bool { NoCheckSigs = false, CheckSigs = true };
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enum SubstituteFlag : bool { NoSubstitute = false, Substitute = true };
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enum AllowInvalidFlag : bool { DisallowInvalid = false, AllowInvalid = true };
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/* Magic header of exportPath() output (obsolete). */
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const uint32_t exportMagic = 0x4558494e;
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typedef std::unordered_map<StorePath, std::unordered_set<std::string>> Roots;
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struct GCOptions
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{
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/* Garbage collector operation:
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- `gcReturnLive': return the set of paths reachable from
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(i.e. in the closure of) the roots.
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- `gcReturnDead': return the set of paths not reachable from
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the roots.
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- `gcDeleteDead': actually delete the latter set.
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- `gcDeleteSpecific': delete the paths listed in
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`pathsToDelete', insofar as they are not reachable.
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*/
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typedef enum {
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gcReturnLive,
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gcReturnDead,
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gcDeleteDead,
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gcDeleteSpecific,
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} GCAction;
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GCAction action{gcDeleteDead};
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/* If `ignoreLiveness' is set, then reachability from the roots is
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ignored (dangerous!). However, the paths must still be
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unreferenced *within* the store (i.e., there can be no other
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store paths that depend on them). */
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bool ignoreLiveness{false};
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/* For `gcDeleteSpecific', the paths to delete. */
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StorePathSet pathsToDelete;
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/* Stop after at least `maxFreed' bytes have been freed. */
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uint64_t maxFreed{std::numeric_limits<uint64_t>::max()};
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};
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struct GCResults
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{
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/* Depending on the action, the GC roots, or the paths that would
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be or have been deleted. */
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PathSet paths;
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/* For `gcReturnDead', `gcDeleteDead' and `gcDeleteSpecific', the
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number of bytes that would be or was freed. */
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uint64_t bytesFreed = 0;
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};
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enum BuildMode { bmNormal, bmRepair, bmCheck };
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struct BuildResult
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{
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/* Note: don't remove status codes, and only add new status codes
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at the end of the list, to prevent client/server
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incompatibilities in the nix-store --serve protocol. */
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enum Status {
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Built = 0,
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Substituted,
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AlreadyValid,
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PermanentFailure,
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InputRejected,
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OutputRejected,
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TransientFailure, // possibly transient
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CachedFailure, // no longer used
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TimedOut,
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MiscFailure,
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DependencyFailed,
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LogLimitExceeded,
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NotDeterministic,
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} status = MiscFailure;
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std::string errorMsg;
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/* How many times this build was performed. */
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unsigned int timesBuilt = 0;
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/* If timesBuilt > 1, whether some builds did not produce the same
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result. (Note that 'isNonDeterministic = false' does not mean
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the build is deterministic, just that we don't have evidence of
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non-determinism.) */
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bool isNonDeterministic = false;
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/* The start/stop times of the build (or one of the rounds, if it
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was repeated). */
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time_t startTime = 0, stopTime = 0;
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bool success() {
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return status == Built || status == Substituted || status == AlreadyValid;
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}
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};
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struct StoreConfig : public Config
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{
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using Config::Config;
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StoreConfig() = delete;
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virtual ~StoreConfig() { }
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virtual const std::string name() = 0;
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const PathSetting storeDir_{this, false, settings.nixStore,
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"store", "path to the Nix store"};
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const Path storeDir = storeDir_;
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const Setting<int> pathInfoCacheSize{this, 65536, "path-info-cache-size", "size of the in-memory store path information cache"};
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const Setting<bool> isTrusted{this, false, "trusted", "whether paths from this store can be used as substitutes even when they lack trusted signatures"};
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Setting<int> priority{this, 0, "priority", "priority of this substituter (lower value means higher priority)"};
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Setting<bool> wantMassQuery{this, false, "want-mass-query", "whether this substituter can be queried efficiently for path validity"};
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Setting<StringSet> systemFeatures{this, settings.systemFeatures,
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"system-features",
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"Optional features that the system this store builds on implements (like \"kvm\")."};
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};
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class Store : public std::enable_shared_from_this<Store>, public virtual StoreConfig
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{
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public:
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typedef std::map<std::string, std::string> Params;
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protected:
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struct PathInfoCacheValue {
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// Time of cache entry creation or update
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std::chrono::time_point<std::chrono::steady_clock> time_point = std::chrono::steady_clock::now();
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// Null if missing
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std::shared_ptr<const ValidPathInfo> value;
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// Whether the value is valid as a cache entry. The path may not exist.
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bool isKnownNow();
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// Past tense, because a path can only be assumed to exists when
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// isKnownNow() && didExist()
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inline bool didExist() {
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return value != nullptr;
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}
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};
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struct State
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{
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// FIXME: fix key
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LRUCache<std::string, PathInfoCacheValue> pathInfoCache;
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};
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Sync<State> state;
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std::shared_ptr<NarInfoDiskCache> diskCache;
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Store(const Params & params);
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public:
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/**
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* Perform any necessary effectful operation to make the store up and
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* running
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*/
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virtual void init() {};
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virtual ~Store() { }
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virtual std::string getUri() = 0;
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StorePath parseStorePath(std::string_view path) const;
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std::optional<StorePath> maybeParseStorePath(std::string_view path) const;
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std::string printStorePath(const StorePath & path) const;
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// FIXME: remove
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StorePathSet parseStorePathSet(const PathSet & paths) const;
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PathSet printStorePathSet(const StorePathSet & path) const;
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/* Split a string specifying a derivation and a set of outputs
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(/nix/store/hash-foo!out1,out2,...) into the derivation path
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and the outputs. */
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StorePathWithOutputs parsePathWithOutputs(const string & s);
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/* Display a set of paths in human-readable form (i.e., between quotes
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and separated by commas). */
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std::string showPaths(const StorePathSet & paths);
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/* Return true if ‘path’ is in the Nix store (but not the Nix
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store itself). */
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bool isInStore(const Path & path) const;
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/* Return true if ‘path’ is a store path, i.e. a direct child of
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the Nix store. */
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bool isStorePath(std::string_view path) const;
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/* Split a path like /nix/store/<hash>-<name>/<bla> into
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/nix/store/<hash>-<name> and /<bla>. */
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std::pair<StorePath, Path> toStorePath(const Path & path) const;
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/* Follow symlinks until we end up with a path in the Nix store. */
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Path followLinksToStore(std::string_view path) const;
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/* Same as followLinksToStore(), but apply toStorePath() to the
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result. */
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StorePath followLinksToStorePath(std::string_view path) const;
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StorePathWithOutputs followLinksToStorePathWithOutputs(std::string_view path) const;
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/* Constructs a unique store path name. */
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StorePath makeStorePath(std::string_view type,
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std::string_view hash, std::string_view name) const;
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StorePath makeStorePath(std::string_view type,
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const Hash & hash, std::string_view name) const;
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StorePath makeOutputPath(std::string_view id,
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const Hash & hash, std::string_view name) const;
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StorePath makeFixedOutputPath(FileIngestionMethod method,
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const Hash & hash, std::string_view name,
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const StorePathSet & references = {},
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bool hasSelfReference = false) const;
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StorePath makeTextPath(std::string_view name, const Hash & hash,
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const StorePathSet & references = {}) const;
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StorePath makeFixedOutputPathFromCA(std::string_view name, ContentAddress ca,
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const StorePathSet & references = {},
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bool hasSelfReference = false) const;
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/* This is the preparatory part of addToStore(); it computes the
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store path to which srcPath is to be copied. Returns the store
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path and the cryptographic hash of the contents of srcPath. */
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std::pair<StorePath, Hash> computeStorePathForPath(std::string_view name,
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const Path & srcPath, FileIngestionMethod method = FileIngestionMethod::Recursive,
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HashType hashAlgo = htSHA256, PathFilter & filter = defaultPathFilter) const;
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/* Preparatory part of addTextToStore().
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!!! Computation of the path should take the references given to
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addTextToStore() into account, otherwise we have a (relatively
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minor) security hole: a caller can register a source file with
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bogus references. If there are too many references, the path may
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not be garbage collected when it has to be (not really a problem,
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the caller could create a root anyway), or it may be garbage
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collected when it shouldn't be (more serious).
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Hashing the references would solve this (bogus references would
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simply yield a different store path, so other users wouldn't be
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affected), but it has some backwards compatibility issues (the
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hashing scheme changes), so I'm not doing that for now. */
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StorePath computeStorePathForText(const string & name, const string & s,
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const StorePathSet & references) const;
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/* Check whether a path is valid. */
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bool isValidPath(const StorePath & path);
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protected:
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virtual bool isValidPathUncached(const StorePath & path);
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public:
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/* If requested, substitute missing paths. This
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implements nix-copy-closure's --use-substitutes
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flag. */
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void substitutePaths(const StorePathSet & paths);
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/* Query which of the given paths is valid. Optionally, try to
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substitute missing paths. */
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virtual StorePathSet queryValidPaths(const StorePathSet & paths,
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SubstituteFlag maybeSubstitute = NoSubstitute);
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/* Query the set of all valid paths. Note that for some store
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backends, the name part of store paths may be replaced by 'x'
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(i.e. you'll get /nix/store/<hash>-x rather than
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/nix/store/<hash>-<name>). Use queryPathInfo() to obtain the
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full store path. FIXME: should return a set of
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std::variant<StorePath, HashPart> to get rid of this hack. */
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virtual StorePathSet queryAllValidPaths()
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{ unsupported("queryAllValidPaths"); }
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constexpr static const char * MissingName = "x";
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/* Query information about a valid path. It is permitted to omit
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the name part of the store path. */
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ref<const ValidPathInfo> queryPathInfo(const StorePath & path);
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/* Asynchronous version of queryPathInfo(). */
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void queryPathInfo(const StorePath & path,
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Callback<ref<const ValidPathInfo>> callback) noexcept;
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protected:
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virtual void queryPathInfoUncached(const StorePath & path,
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Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept = 0;
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public:
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virtual std::optional<const Realisation> queryRealisation(const DrvOutput &) = 0;
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/* Queries the set of incoming FS references for a store path.
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The result is not cleared. */
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virtual void queryReferrers(const StorePath & path, StorePathSet & referrers)
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{ unsupported("queryReferrers"); }
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/* Return all currently valid derivations that have `path' as an
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output. (Note that the result of `queryDeriver()' is the
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derivation that was actually used to produce `path', which may
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not exist anymore.) */
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virtual StorePathSet queryValidDerivers(const StorePath & path) { return {}; };
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/* Query the outputs of the derivation denoted by `path'. */
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virtual StorePathSet queryDerivationOutputs(const StorePath & path);
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/* Query the mapping outputName => outputPath for the given derivation. All
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outputs are mentioned so ones mising the mapping are mapped to
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`std::nullopt`. */
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virtual std::map<std::string, std::optional<StorePath>> queryPartialDerivationOutputMap(const StorePath & path);
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/*
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* Similar to `queryPartialDerivationOutputMap`, but doesn't try to resolve
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* the derivation
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*/
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virtual std::map<std::string, std::optional<StorePath>> queryDerivationOutputMapNoResolve(const StorePath & path);
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/* Query the mapping outputName=>outputPath for the given derivation.
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Assume every output has a mapping and throw an exception otherwise. */
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OutputPathMap queryDerivationOutputMap(const StorePath & path);
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/* Query the full store path given the hash part of a valid store
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path, or empty if the path doesn't exist. */
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virtual std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) = 0;
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/* Query which of the given paths have substitutes. */
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virtual StorePathSet querySubstitutablePaths(const StorePathSet & paths) { return {}; };
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/* Query substitute info (i.e. references, derivers and download
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sizes) of a map of paths to their optional ca values. If a path
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does not have substitute info, it's omitted from the resulting
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‘infos’ map. */
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virtual void querySubstitutablePathInfos(const StorePathCAMap & paths,
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SubstitutablePathInfos & infos) { return; };
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/* Import a path into the store. */
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virtual void addToStore(const ValidPathInfo & info, Source & narSource,
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RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs) = 0;
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/* Copy the contents of a path to the store and register the
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validity the resulting path. The resulting path is returned.
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The function object `filter' can be used to exclude files (see
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libutil/archive.hh). */
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virtual StorePath addToStore(const string & name, const Path & srcPath,
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FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256,
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PathFilter & filter = defaultPathFilter, RepairFlag repair = NoRepair);
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/* Copy the contents of a path to the store and register the
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validity the resulting path, using a constant amount of
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memory. */
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ValidPathInfo addToStoreSlow(std::string_view name, const Path & srcPath,
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FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256,
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std::optional<Hash> expectedCAHash = {});
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/* Like addToStore(), but the contents of the path are contained
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in `dump', which is either a NAR serialisation (if recursive ==
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true) or simply the contents of a regular file (if recursive ==
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false).
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`dump` may be drained */
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// FIXME: remove?
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virtual StorePath addToStoreFromDump(Source & dump, const string & name,
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FileIngestionMethod method = FileIngestionMethod::Recursive, HashType hashAlgo = htSHA256, RepairFlag repair = NoRepair)
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{ unsupported("addToStoreFromDump"); }
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/* Like addToStore, but the contents written to the output path is
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a regular file containing the given string. */
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virtual StorePath addTextToStore(const string & name, const string & s,
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const StorePathSet & references, RepairFlag repair = NoRepair) = 0;
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/**
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* Add a mapping indicating that `deriver!outputName` maps to the output path
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* `output`.
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*
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* This is redundant for known-input-addressed and fixed-output derivations
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* as this information is already present in the drv file, but necessary for
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* floating-ca derivations and their dependencies as there's no way to
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* retrieve this information otherwise.
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*/
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virtual void registerDrvOutput(const Realisation & output)
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{ unsupported("registerDrvOutput"); }
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/* Write a NAR dump of a store path. */
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virtual void narFromPath(const StorePath & path, Sink & sink) = 0;
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/* For each path, if it's a derivation, build it. Building a
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derivation means ensuring that the output paths are valid. If
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they are already valid, this is a no-op. Otherwise, validity
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can be reached in two ways. First, if the output paths is
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substitutable, then build the path that way. Second, the
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output paths can be created by running the builder, after
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recursively building any sub-derivations. For inputs that are
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not derivations, substitute them. */
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virtual void buildPaths(
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const std::vector<StorePathWithOutputs> & paths,
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BuildMode buildMode = bmNormal);
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/* Build a single non-materialized derivation (i.e. not from an
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on-disk .drv file).
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‘drvPath’ is used to deduplicate worker goals so it is imperative that
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is correct. That said, it doesn't literally need to be store path that
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would be calculated from writing this derivation to the store: it is OK
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if it instead is that of a Derivation which would resolve to this (by
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taking the outputs of it's input derivations and adding them as input
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sources) such that the build time referenceable-paths are the same.
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In the input-addressed case, we usually *do* use an "original"
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unresolved derivations's path, as that is what will be used in the
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`buildPaths` case. Also, the input-addressed output paths are verified
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only by that contents of that specific unresolved derivation, so it is
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nice to keep that information around so if the original derivation is
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ever obtained later, it can be verified whether the trusted user in fact
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used the proper output path.
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In the content-addressed case, we want to always use the
|
||
resolved drv path calculated from the provided derivation. This serves
|
||
two purposes:
|
||
|
||
- It keeps the operation trustless, by ruling out a maliciously
|
||
invalid drv path corresponding to a non-resolution-equivalent
|
||
derivation.
|
||
|
||
- For the floating case in particular, it ensures that the derivation
|
||
to output mapping respects the resolution equivalence relation, so
|
||
one cannot choose different resolution-equivalent derivations to
|
||
subvert dependency coherence (i.e. the property that one doesn't end
|
||
up with multiple different versions of dependencies without
|
||
explicitly choosing to allow it).
|
||
*/
|
||
virtual BuildResult buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
|
||
BuildMode buildMode = bmNormal) = 0;
|
||
|
||
/* Ensure that a path is valid. If it is not currently valid, it
|
||
may be made valid by running a substitute (if defined for the
|
||
path). */
|
||
virtual void ensurePath(const StorePath & path) = 0;
|
||
|
||
/* Add a store path as a temporary root of the garbage collector.
|
||
The root disappears as soon as we exit. */
|
||
virtual void addTempRoot(const StorePath & path)
|
||
{ unsupported("addTempRoot"); }
|
||
|
||
/* Add an indirect root, which is merely a symlink to `path' from
|
||
/nix/var/nix/gcroots/auto/<hash of `path'>. `path' is supposed
|
||
to be a symlink to a store path. The garbage collector will
|
||
automatically remove the indirect root when it finds that
|
||
`path' has disappeared. */
|
||
virtual void addIndirectRoot(const Path & path)
|
||
{ unsupported("addIndirectRoot"); }
|
||
|
||
/* Acquire the global GC lock, then immediately release it. This
|
||
function must be called after registering a new permanent root,
|
||
but before exiting. Otherwise, it is possible that a running
|
||
garbage collector doesn't see the new root and deletes the
|
||
stuff we've just built. By acquiring the lock briefly, we
|
||
ensure that either:
|
||
|
||
- The collector is already running, and so we block until the
|
||
collector is finished. The collector will know about our
|
||
*temporary* locks, which should include whatever it is we
|
||
want to register as a permanent lock.
|
||
|
||
- The collector isn't running, or it's just started but hasn't
|
||
acquired the GC lock yet. In that case we get and release
|
||
the lock right away, then exit. The collector scans the
|
||
permanent root and sees ours.
|
||
|
||
In either case the permanent root is seen by the collector. */
|
||
virtual void syncWithGC() { };
|
||
|
||
/* Find the roots of the garbage collector. Each root is a pair
|
||
(link, storepath) where `link' is the path of the symlink
|
||
outside of the Nix store that point to `storePath'. If
|
||
'censor' is true, privacy-sensitive information about roots
|
||
found in /proc is censored. */
|
||
virtual Roots findRoots(bool censor)
|
||
{ unsupported("findRoots"); }
|
||
|
||
/* Perform a garbage collection. */
|
||
virtual void collectGarbage(const GCOptions & options, GCResults & results)
|
||
{ unsupported("collectGarbage"); }
|
||
|
||
/* Return a string representing information about the path that
|
||
can be loaded into the database using `nix-store --load-db' or
|
||
`nix-store --register-validity'. */
|
||
string makeValidityRegistration(const StorePathSet & paths,
|
||
bool showDerivers, bool showHash);
|
||
|
||
/* Write a JSON representation of store path metadata, such as the
|
||
hash and the references. If ‘includeImpureInfo’ is true,
|
||
variable elements such as the registration time are
|
||
included. If ‘showClosureSize’ is true, the closure size of
|
||
each path is included. */
|
||
void pathInfoToJSON(JSONPlaceholder & jsonOut, const StorePathSet & storePaths,
|
||
bool includeImpureInfo, bool showClosureSize,
|
||
Base hashBase = Base32,
|
||
AllowInvalidFlag allowInvalid = DisallowInvalid);
|
||
|
||
/* Return the size of the closure of the specified path, that is,
|
||
the sum of the size of the NAR serialisation of each path in
|
||
the closure. */
|
||
std::pair<uint64_t, uint64_t> getClosureSize(const StorePath & storePath);
|
||
|
||
/* Optimise the disk space usage of the Nix store by hard-linking files
|
||
with the same contents. */
|
||
virtual void optimiseStore() { };
|
||
|
||
/* Check the integrity of the Nix store. Returns true if errors
|
||
remain. */
|
||
virtual bool verifyStore(bool checkContents, RepairFlag repair = NoRepair) { return false; };
|
||
|
||
/* Return an object to access files in the Nix store. */
|
||
virtual ref<FSAccessor> getFSAccessor()
|
||
{ unsupported("getFSAccessor"); }
|
||
|
||
/* Repair the contents of the given path by redownloading it using
|
||
a substituter (if available). */
|
||
virtual void repairPath(const StorePath & path)
|
||
{ unsupported("repairPath"); }
|
||
|
||
/* Add signatures to the specified store path. The signatures are
|
||
not verified. */
|
||
virtual void addSignatures(const StorePath & storePath, const StringSet & sigs)
|
||
{ unsupported("addSignatures"); }
|
||
|
||
/* Utility functions. */
|
||
|
||
/* Read a derivation, after ensuring its existence through
|
||
ensurePath(). */
|
||
Derivation derivationFromPath(const StorePath & drvPath);
|
||
|
||
/* Read a derivation (which must already be valid). */
|
||
Derivation readDerivation(const StorePath & drvPath);
|
||
|
||
/* Read a derivation from a potentially invalid path. */
|
||
Derivation readInvalidDerivation(const StorePath & drvPath);
|
||
|
||
/* Place in `out' the set of all store paths in the file system
|
||
closure of `storePath'; that is, all paths than can be directly
|
||
or indirectly reached from it. `out' is not cleared. If
|
||
`flipDirection' is true, the set of paths that can reach
|
||
`storePath' is returned; that is, the closures under the
|
||
`referrers' relation instead of the `references' relation is
|
||
returned. */
|
||
virtual void computeFSClosure(const StorePathSet & paths,
|
||
StorePathSet & out, bool flipDirection = false,
|
||
bool includeOutputs = false, bool includeDerivers = false);
|
||
|
||
void computeFSClosure(const StorePath & path,
|
||
StorePathSet & out, bool flipDirection = false,
|
||
bool includeOutputs = false, bool includeDerivers = false);
|
||
|
||
/* Given a set of paths that are to be built, return the set of
|
||
derivations that will be built, and the set of output paths
|
||
that will be substituted. */
|
||
virtual void queryMissing(const std::vector<StorePathWithOutputs> & targets,
|
||
StorePathSet & willBuild, StorePathSet & willSubstitute, StorePathSet & unknown,
|
||
uint64_t & downloadSize, uint64_t & narSize);
|
||
|
||
/* Sort a set of paths topologically under the references
|
||
relation. If p refers to q, then p precedes q in this list. */
|
||
StorePaths topoSortPaths(const StorePathSet & paths);
|
||
|
||
/* Export multiple paths in the format expected by ‘nix-store
|
||
--import’. */
|
||
void exportPaths(const StorePathSet & paths, Sink & sink);
|
||
|
||
void exportPath(const StorePath & path, Sink & sink);
|
||
|
||
/* Import a sequence of NAR dumps created by exportPaths() into
|
||
the Nix store. Optionally, the contents of the NARs are
|
||
preloaded into the specified FS accessor to speed up subsequent
|
||
access. */
|
||
StorePaths importPaths(Source & source, CheckSigsFlag checkSigs = CheckSigs);
|
||
|
||
struct Stats
|
||
{
|
||
std::atomic<uint64_t> narInfoRead{0};
|
||
std::atomic<uint64_t> narInfoReadAverted{0};
|
||
std::atomic<uint64_t> narInfoMissing{0};
|
||
std::atomic<uint64_t> narInfoWrite{0};
|
||
std::atomic<uint64_t> pathInfoCacheSize{0};
|
||
std::atomic<uint64_t> narRead{0};
|
||
std::atomic<uint64_t> narReadBytes{0};
|
||
std::atomic<uint64_t> narReadCompressedBytes{0};
|
||
std::atomic<uint64_t> narWrite{0};
|
||
std::atomic<uint64_t> narWriteAverted{0};
|
||
std::atomic<uint64_t> narWriteBytes{0};
|
||
std::atomic<uint64_t> narWriteCompressedBytes{0};
|
||
std::atomic<uint64_t> narWriteCompressionTimeMs{0};
|
||
};
|
||
|
||
const Stats & getStats();
|
||
|
||
/* Return the build log of the specified store path, if available,
|
||
or null otherwise. */
|
||
virtual std::shared_ptr<std::string> getBuildLog(const StorePath & path)
|
||
{ return nullptr; }
|
||
|
||
/* Hack to allow long-running processes like hydra-queue-runner to
|
||
occasionally flush their path info cache. */
|
||
void clearPathInfoCache()
|
||
{
|
||
state.lock()->pathInfoCache.clear();
|
||
}
|
||
|
||
/* Establish a connection to the store, for store types that have
|
||
a notion of connection. Otherwise this is a no-op. */
|
||
virtual void connect() { };
|
||
|
||
/* Get the protocol version of this store or it's connection. */
|
||
virtual unsigned int getProtocol()
|
||
{
|
||
return 0;
|
||
};
|
||
|
||
virtual Path toRealPath(const Path & storePath)
|
||
{
|
||
return storePath;
|
||
}
|
||
|
||
Path toRealPath(const StorePath & storePath)
|
||
{
|
||
return toRealPath(printStorePath(storePath));
|
||
}
|
||
|
||
virtual void createUser(const std::string & userName, uid_t userId)
|
||
{ }
|
||
|
||
protected:
|
||
|
||
Stats stats;
|
||
|
||
/* Unsupported methods. */
|
||
[[noreturn]] void unsupported(const std::string & op)
|
||
{
|
||
throw Unsupported("operation '%s' is not supported by store '%s'", op, getUri());
|
||
}
|
||
|
||
};
|
||
|
||
|
||
/* Copy a path from one store to another. */
|
||
void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
|
||
const StorePath & storePath, RepairFlag repair = NoRepair, CheckSigsFlag checkSigs = CheckSigs);
|
||
|
||
|
||
/* Copy store paths from one store to another. The paths may be copied
|
||
in parallel. They are copied in a topologically sorted order (i.e.
|
||
if A is a reference of B, then A is copied before B), but the set
|
||
of store paths is not automatically closed; use copyClosure() for
|
||
that. Returns a map of what each path was copied to the dstStore
|
||
as. */
|
||
std::map<StorePath, StorePath> copyPaths(ref<Store> srcStore, ref<Store> dstStore,
|
||
const StorePathSet & storePaths,
|
||
RepairFlag repair = NoRepair,
|
||
CheckSigsFlag checkSigs = CheckSigs,
|
||
SubstituteFlag substitute = NoSubstitute);
|
||
|
||
|
||
/* Copy the closure of the specified paths from one store to another. */
|
||
void copyClosure(ref<Store> srcStore, ref<Store> dstStore,
|
||
const StorePathSet & storePaths,
|
||
RepairFlag repair = NoRepair,
|
||
CheckSigsFlag checkSigs = CheckSigs,
|
||
SubstituteFlag substitute = NoSubstitute);
|
||
|
||
|
||
/* Remove the temporary roots file for this process. Any temporary
|
||
root becomes garbage after this point unless it has been registered
|
||
as a (permanent) root. */
|
||
void removeTempRoots();
|
||
|
||
|
||
/* Return a Store object to access the Nix store denoted by
|
||
‘uri’ (slight misnomer...). Supported values are:
|
||
|
||
* ‘local’: The Nix store in /nix/store and database in
|
||
/nix/var/nix/db, accessed directly.
|
||
|
||
* ‘daemon’: The Nix store accessed via a Unix domain socket
|
||
connection to nix-daemon.
|
||
|
||
* ‘unix://<path>’: The Nix store accessed via a Unix domain socket
|
||
connection to nix-daemon, with the socket located at <path>.
|
||
|
||
* ‘auto’ or ‘’: Equivalent to ‘local’ or ‘daemon’ depending on
|
||
whether the user has write access to the local Nix
|
||
store/database.
|
||
|
||
* ‘file://<path>’: A binary cache stored in <path>.
|
||
|
||
* ‘https://<path>’: A binary cache accessed via HTTP.
|
||
|
||
* ‘s3://<path>’: A writable binary cache stored on Amazon's Simple
|
||
Storage Service.
|
||
|
||
* ‘ssh://[user@]<host>’: A remote Nix store accessed by running
|
||
‘nix-store --serve’ via SSH.
|
||
|
||
You can pass parameters to the store implementation by appending
|
||
‘?key=value&key=value&...’ to the URI.
|
||
*/
|
||
ref<Store> openStore(const std::string & uri = settings.storeUri.get(),
|
||
const Store::Params & extraParams = Store::Params());
|
||
|
||
|
||
/* Return the default substituter stores, defined by the
|
||
‘substituters’ option and various legacy options. */
|
||
std::list<ref<Store>> getDefaultSubstituters();
|
||
|
||
struct StoreFactory
|
||
{
|
||
std::set<std::string> uriSchemes;
|
||
std::function<std::shared_ptr<Store> (const std::string & scheme, const std::string & uri, const Store::Params & params)> create;
|
||
std::function<std::shared_ptr<StoreConfig> ()> getConfig;
|
||
};
|
||
|
||
struct Implementations
|
||
{
|
||
static std::vector<StoreFactory> * registered;
|
||
|
||
template<typename T, typename TConfig>
|
||
static void add()
|
||
{
|
||
if (!registered) registered = new std::vector<StoreFactory>();
|
||
StoreFactory factory{
|
||
.uriSchemes = T::uriSchemes(),
|
||
.create =
|
||
([](const std::string & scheme, const std::string & uri, const Store::Params & params)
|
||
-> std::shared_ptr<Store>
|
||
{ return std::make_shared<T>(scheme, uri, params); }),
|
||
.getConfig =
|
||
([]()
|
||
-> std::shared_ptr<StoreConfig>
|
||
{ return std::make_shared<TConfig>(StringMap({})); })
|
||
};
|
||
registered->push_back(factory);
|
||
}
|
||
};
|
||
|
||
template<typename T, typename TConfig>
|
||
struct RegisterStoreImplementation
|
||
{
|
||
RegisterStoreImplementation()
|
||
{
|
||
Implementations::add<T, TConfig>();
|
||
}
|
||
};
|
||
|
||
|
||
/* Display a set of paths in human-readable form (i.e., between quotes
|
||
and separated by commas). */
|
||
string showPaths(const PathSet & paths);
|
||
|
||
|
||
std::optional<ValidPathInfo> decodeValidPathInfo(
|
||
const Store & store,
|
||
std::istream & str,
|
||
std::optional<HashResult> hashGiven = std::nullopt);
|
||
|
||
/* Split URI into protocol+hierarchy part and its parameter set. */
|
||
std::pair<std::string, Store::Params> splitUriAndParams(const std::string & uri);
|
||
|
||
std::optional<ContentAddress> getDerivationCA(const BasicDerivation & drv);
|
||
|
||
}
|