588 lines
20 KiB
C++
588 lines
20 KiB
C++
#pragma once
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#include "hash.hh"
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#include "serialise.hh"
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#include "crypto.hh"
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#include "lru-cache.hh"
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#include "sync.hh"
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#include <atomic>
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#include <limits>
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#include <map>
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#include <memory>
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#include <string>
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namespace nix {
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/* Size of the hash part of store paths, in base-32 characters. */
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const size_t storePathHashLen = 32; // i.e. 160 bits
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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::map<Path, Path> 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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PathSet pathsToDelete;
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/* Stop after at least `maxFreed' bytes have been freed. */
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unsigned long long maxFreed{std::numeric_limits<unsigned long long>::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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unsigned long long bytesFreed;
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GCResults()
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{
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bytesFreed = 0;
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}
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};
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struct SubstitutablePathInfo
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{
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Path deriver;
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PathSet references;
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unsigned long long downloadSize; /* 0 = unknown or inapplicable */
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unsigned long long narSize; /* 0 = unknown */
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};
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typedef std::map<Path, SubstitutablePathInfo> SubstitutablePathInfos;
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struct ValidPathInfo
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{
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Path path;
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Path deriver;
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Hash narHash;
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PathSet references;
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time_t registrationTime = 0;
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uint64_t narSize = 0; // 0 = unknown
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uint64_t id; // internal use only
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/* Whether the path is ultimately trusted, that is, it was built
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locally or is content-addressable (e.g. added via addToStore()
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or the result of a fixed-output derivation). */
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bool ultimate = false;
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StringSet sigs; // note: not necessarily verified
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bool operator == (const ValidPathInfo & i) const
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{
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return
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path == i.path
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&& narHash == i.narHash
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&& references == i.references;
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}
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/* Return a fingerprint of the store path to be used in binary
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cache signatures. It contains the store path, the base-32
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SHA-256 hash of the NAR serialisation of the path, the size of
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the NAR, and the sorted references. The size field is strictly
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speaking superfluous, but might prevent endless/excessive data
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attacks. */
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std::string fingerprint() const;
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void sign(const SecretKey & secretKey);
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/* Return the number of signatures on this .narinfo that were
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produced by one of the specified keys. */
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unsigned int checkSignatures(const PublicKeys & publicKeys) const;
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/* Verify a single signature. */
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bool checkSignature(const PublicKeys & publicKeys, const std::string & sig) const;
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Strings shortRefs() const;
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virtual ~ValidPathInfo() { }
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};
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typedef list<ValidPathInfo> ValidPathInfos;
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enum BuildMode { bmNormal, bmRepair, bmCheck, bmHash };
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struct BuildResult
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{
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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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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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//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 BasicDerivation;
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struct Derivation;
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class FSAccessor;
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class NarInfoDiskCache;
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class Store : public std::enable_shared_from_this<Store>
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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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const Path storeDir;
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protected:
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struct State
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{
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LRUCache<std::string, std::shared_ptr<ValidPathInfo>> pathInfoCache{64 * 1024};
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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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virtual ~Store() { }
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virtual std::string getUri() = 0;
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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(const Path & path) const;
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/* Throw an exception if ‘path’ is not a store path. */
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void assertStorePath(const Path & path) const;
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/* Chop off the parts after the top-level store name, e.g.,
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/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
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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(const Path & path) const;
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/* Same as followLinksToStore(), but apply toStorePath() to the
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result. */
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Path followLinksToStorePath(const Path & path) const;
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/* Constructs a unique store path name. */
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Path makeStorePath(const string & type,
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const Hash & hash, const string & name) const;
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Path makeOutputPath(const string & id,
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const Hash & hash, const string & name) const;
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Path makeFixedOutputPath(bool recursive,
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HashType hashAlgo, Hash hash, string name) const;
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/* This is the preparatory part of addToStore() and
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addToStoreFixed(); it computes the store path to which srcPath
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is to be copied. Returns the store path and the cryptographic
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hash of the contents of srcPath. */
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std::pair<Path, Hash> computeStorePathForPath(const Path & srcPath,
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bool recursive = true, HashType hashAlgo = htSHA256,
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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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Path computeStorePathForText(const string & name, const string & s,
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const PathSet & references) const;
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/* Check whether a path is valid. */
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bool isValidPath(const Path & path);
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protected:
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virtual bool isValidPathUncached(const Path & path) = 0;
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public:
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/* Query which of the given paths is valid. */
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virtual PathSet queryValidPaths(const PathSet & paths) = 0;
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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 omitted
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(i.e. you'll get /nix/store/<hash> rather than
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/nix/store/<hash>-<name>). Use queryPathInfo() to obtain the
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full store path. */
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virtual PathSet queryAllValidPaths() = 0;
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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 Path & path);
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protected:
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virtual std::shared_ptr<ValidPathInfo> queryPathInfoUncached(const Path & path) = 0;
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public:
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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 Path & path,
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PathSet & referrers) = 0;
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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 PathSet queryValidDerivers(const Path & path) = 0;
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/* Query the outputs of the derivation denoted by `path'. */
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virtual PathSet queryDerivationOutputs(const Path & path) = 0;
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/* Query the output names of the derivation denoted by `path'. */
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virtual StringSet queryDerivationOutputNames(const Path & path) = 0;
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/* Query the full store path given the hash part of a valid store
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path, or "" if the path doesn't exist. */
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virtual Path queryPathFromHashPart(const string & hashPart) = 0;
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/* Query which of the given paths have substitutes. */
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virtual PathSet querySubstitutablePaths(const PathSet & paths) = 0;
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/* Query substitute info (i.e. references, derivers and download
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sizes) of a set of paths. If a path does not have substitute
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info, it's omitted from the resulting ‘infos’ map. */
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virtual void querySubstitutablePathInfos(const PathSet & paths,
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SubstitutablePathInfos & infos) = 0;
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virtual bool wantMassQuery() { return false; }
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/* Import a path into the store. */
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virtual void addToStore(const ValidPathInfo & info, const std::string & nar,
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bool repair = false, bool dontCheckSigs = false) = 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 Path addToStore(const string & name, const Path & srcPath,
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bool recursive = true, HashType hashAlgo = htSHA256,
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PathFilter & filter = defaultPathFilter, bool repair = false) = 0;
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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 Path addTextToStore(const string & name, const string & s,
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const PathSet & references, bool repair = false) = 0;
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/* Write a NAR dump of a store path. */
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virtual void narFromPath(const Path & 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(const PathSet & paths, BuildMode buildMode = bmNormal) = 0;
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/* Build a single non-materialized derivation (i.e. not from an
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on-disk .drv file). Note that ‘drvPath’ is only used for
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informational purposes. */
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virtual BuildResult buildDerivation(const Path & drvPath, const BasicDerivation & drv,
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BuildMode buildMode = bmNormal) = 0;
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/* Ensure that a path is valid. If it is not currently valid, it
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may be made valid by running a substitute (if defined for the
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path). */
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virtual void ensurePath(const Path & path) = 0;
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/* Add a store path as a temporary root of the garbage collector.
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The root disappears as soon as we exit. */
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virtual void addTempRoot(const Path & path) = 0;
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/* Add an indirect root, which is merely a symlink to `path' from
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/nix/var/nix/gcroots/auto/<hash of `path'>. `path' is supposed
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to be a symlink to a store path. The garbage collector will
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automatically remove the indirect root when it finds that
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`path' has disappeared. */
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virtual void addIndirectRoot(const Path & path) = 0;
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/* Register a permanent GC root. */
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Path addPermRoot(const Path & storePath,
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const Path & gcRoot, bool indirect, bool allowOutsideRootsDir = false);
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/* Acquire the global GC lock, then immediately release it. This
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function must be called after registering a new permanent root,
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but before exiting. Otherwise, it is possible that a running
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garbage collector doesn't see the new root and deletes the
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stuff we've just built. By acquiring the lock briefly, we
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ensure that either:
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- The collector is already running, and so we block until the
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collector is finished. The collector will know about our
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*temporary* locks, which should include whatever it is we
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want to register as a permanent lock.
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- The collector isn't running, or it's just started but hasn't
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acquired the GC lock yet. In that case we get and release
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the lock right away, then exit. The collector scans the
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permanent root and sees our's.
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In either case the permanent root is seen by the collector. */
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virtual void syncWithGC() = 0;
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/* Find the roots of the garbage collector. Each root is a pair
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(link, storepath) where `link' is the path of the symlink
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outside of the Nix store that point to `storePath'. */
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virtual Roots findRoots() = 0;
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/* Perform a garbage collection. */
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virtual void collectGarbage(const GCOptions & options, GCResults & results) = 0;
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/* Return a string representing information about the path that
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can be loaded into the database using `nix-store --load-db' or
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`nix-store --register-validity'. */
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string makeValidityRegistration(const PathSet & paths,
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bool showDerivers, bool showHash);
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/* Optimise the disk space usage of the Nix store by hard-linking files
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with the same contents. */
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virtual void optimiseStore() = 0;
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/* Check the integrity of the Nix store. Returns true if errors
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remain. */
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virtual bool verifyStore(bool checkContents, bool repair) = 0;
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/* Return an object to access files in the Nix store. */
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virtual ref<FSAccessor> getFSAccessor() = 0;
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/* Add signatures to the specified store path. The signatures are
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not verified. */
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virtual void addSignatures(const Path & storePath, const StringSet & sigs) = 0;
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/* Utility functions. */
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/* Read a derivation, after ensuring its existence through
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ensurePath(). */
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Derivation derivationFromPath(const Path & drvPath);
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/* Place in `paths' the set of all store paths in the file system
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closure of `storePath'; that is, all paths than can be directly
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or indirectly reached from it. `paths' is not cleared. If
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`flipDirection' is true, the set of paths that can reach
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`storePath' is returned; that is, the closures under the
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`referrers' relation instead of the `references' relation is
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returned. */
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void computeFSClosure(const Path & path,
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PathSet & paths, bool flipDirection = false,
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bool includeOutputs = false, bool includeDerivers = false);
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/* Given a set of paths that are to be built, return the set of
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derivations that will be built, and the set of output paths
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that will be substituted. */
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void queryMissing(const PathSet & targets,
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PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
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unsigned long long & downloadSize, unsigned long long & narSize);
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/* Sort a set of paths topologically under the references
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relation. If p refers to q, then p preceeds q in this list. */
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Paths topoSortPaths(const PathSet & paths);
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/* Export multiple paths in the format expected by ‘nix-store
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--import’. */
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void exportPaths(const Paths & paths, Sink & sink);
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void exportPath(const Path & path, Sink & sink);
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/* Import a sequence of NAR dumps created by exportPaths() into
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the Nix store. Optionally, the contents of the NARs are
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preloaded into the specified FS accessor to speed up subsequent
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access. */
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Paths importPaths(Source & source, std::shared_ptr<FSAccessor> accessor,
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bool dontCheckSigs = false);
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struct Stats
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{
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std::atomic<uint64_t> narInfoRead{0};
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std::atomic<uint64_t> narInfoReadAverted{0};
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std::atomic<uint64_t> narInfoMissing{0};
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std::atomic<uint64_t> narInfoWrite{0};
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std::atomic<uint64_t> pathInfoCacheSize{0};
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std::atomic<uint64_t> narRead{0};
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std::atomic<uint64_t> narReadBytes{0};
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std::atomic<uint64_t> narReadCompressedBytes{0};
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std::atomic<uint64_t> narWrite{0};
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std::atomic<uint64_t> narWriteAverted{0};
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std::atomic<uint64_t> narWriteBytes{0};
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std::atomic<uint64_t> narWriteCompressedBytes{0};
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std::atomic<uint64_t> narWriteCompressionTimeMs{0};
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};
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const Stats & getStats();
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protected:
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Stats stats;
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};
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class LocalFSStore : public Store
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{
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protected:
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using Store::Store;
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public:
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void narFromPath(const Path & path, Sink & sink) override;
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ref<FSAccessor> getFSAccessor() override;
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};
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/* Extract the name part of the given store path. */
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string storePathToName(const Path & path);
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/* Extract the hash part of the given store path. */
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string storePathToHash(const Path & path);
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/* Check whether ‘name’ is a valid store path name part, i.e. contains
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only the characters [a-zA-Z0-9\+\-\.\_\?\=] and doesn't start with
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a dot. */
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void checkStoreName(const string & name);
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/* Copy a path from one store to another. */
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void copyStorePath(ref<Store> srcStore, ref<Store> dstStore,
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const Path & storePath, bool repair = false);
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/* Remove the temporary roots file for this process. Any temporary
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root becomes garbage after this point unless it has been registered
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as a (permanent) root. */
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void removeTempRoots();
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/* Return a Store object to access the Nix store denoted by
|
||
‘uri’ (slight misnomer...). Supported values are:
|
||
|
||
* ‘direct’: 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.
|
||
|
||
* ‘file://<path>’: A binary cache stored in <path>.
|
||
|
||
If ‘uri’ is empty, it defaults to ‘direct’ or ‘daemon’ depending on
|
||
whether the user has write access to the local Nix store/database.
|
||
set to true *unless* you're going to collect garbage. */
|
||
ref<Store> openStoreAt(const std::string & uri);
|
||
|
||
|
||
/* Open the store indicated by the ‘NIX_REMOTE’ environment variable. */
|
||
ref<Store> openStore();
|
||
|
||
|
||
/* Return the default substituter stores, defined by the
|
||
‘substituters’ option and various legacy options like
|
||
‘binary-caches’. */
|
||
std::list<ref<Store>> getDefaultSubstituters();
|
||
|
||
|
||
/* Store implementation registration. */
|
||
typedef std::function<std::shared_ptr<Store>(
|
||
const std::string & uri, const Store::Params & params)> OpenStore;
|
||
|
||
struct RegisterStoreImplementation
|
||
{
|
||
typedef std::vector<OpenStore> Implementations;
|
||
static Implementations * implementations;
|
||
|
||
RegisterStoreImplementation(OpenStore fun)
|
||
{
|
||
if (!implementations) implementations = new Implementations;
|
||
implementations->push_back(fun);
|
||
}
|
||
};
|
||
|
||
|
||
|
||
/* Display a set of paths in human-readable form (i.e., between quotes
|
||
and separated by commas). */
|
||
string showPaths(const PathSet & paths);
|
||
|
||
|
||
ValidPathInfo decodeValidPathInfo(std::istream & str,
|
||
bool hashGiven = false);
|
||
|
||
|
||
MakeError(SubstError, Error)
|
||
MakeError(BuildError, Error) /* denotes a permanent build failure */
|
||
MakeError(InvalidPath, Error)
|
||
|
||
|
||
}
|