274 lines
8.0 KiB
C++
274 lines
8.0 KiB
C++
#pragma once
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#include "sqlite.hh"
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#include "pathlocks.hh"
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#include "store-api.hh"
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#include "sync.hh"
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#include "util.hh"
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#include <string>
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#include <unordered_set>
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namespace nix {
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/* Nix store and database schema version. Version 1 (or 0) was Nix <=
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0.7. Version 2 was Nix 0.8 and 0.9. Version 3 is Nix 0.10.
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Version 4 is Nix 0.11. Version 5 is Nix 0.12-0.16. Version 6 is
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Nix 1.0. Version 7 is Nix 1.3. Version 9 is 1.12. */
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const int nixSchemaVersion = 9;
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extern string drvsLogDir;
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struct Derivation;
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struct OptimiseStats
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{
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unsigned long filesLinked;
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unsigned long long bytesFreed;
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unsigned long long blocksFreed;
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OptimiseStats()
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{
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filesLinked = 0;
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bytesFreed = blocksFreed = 0;
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}
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};
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class LocalStore : public LocalFSStore
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{
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private:
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/* Lock file used for upgrading. */
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AutoCloseFD globalLock;
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struct State
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{
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/* The SQLite database object. */
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SQLite db;
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/* Some precompiled SQLite statements. */
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SQLiteStmt stmtRegisterValidPath;
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SQLiteStmt stmtUpdatePathInfo;
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SQLiteStmt stmtAddReference;
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SQLiteStmt stmtQueryPathInfo;
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SQLiteStmt stmtQueryReferences;
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SQLiteStmt stmtQueryReferrers;
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SQLiteStmt stmtInvalidatePath;
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SQLiteStmt stmtAddDerivationOutput;
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SQLiteStmt stmtQueryValidDerivers;
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SQLiteStmt stmtQueryDerivationOutputs;
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SQLiteStmt stmtQueryPathFromHashPart;
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SQLiteStmt stmtQueryValidPaths;
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/* The file to which we write our temporary roots. */
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Path fnTempRoots;
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AutoCloseFD fdTempRoots;
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};
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Sync<State, std::recursive_mutex> _state;
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const Path linksDir;
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const Path reservedPath;
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const Path schemaPath;
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public:
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/* Initialise the local store, upgrading the schema if
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necessary. */
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LocalStore();
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~LocalStore();
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/* Implementations of abstract store API methods. */
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std::string getUri() override;
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bool isValidPathUncached(const Path & path) override;
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PathSet queryValidPaths(const PathSet & paths) override;
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PathSet queryAllValidPaths() override;
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std::shared_ptr<ValidPathInfo> queryPathInfoUncached(const Path & path) override;
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void queryReferrers(const Path & path, PathSet & referrers) override;
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PathSet queryValidDerivers(const Path & path) override;
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PathSet queryDerivationOutputs(const Path & path) override;
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StringSet queryDerivationOutputNames(const Path & path) override;
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Path queryPathFromHashPart(const string & hashPart) override;
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PathSet querySubstitutablePaths(const PathSet & paths) override;
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void querySubstitutablePathInfos(const PathSet & paths,
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SubstitutablePathInfos & infos) override;
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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) override;
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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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Path addToStoreFromDump(const string & dump, const string & name,
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bool recursive = true, HashType hashAlgo = htSHA256, bool repair = false);
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Path addTextToStore(const string & name, const string & s,
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const PathSet & references, bool repair = false) override;
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void exportPath(const Path & path, Sink & sink) override;
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Paths importPaths(Source & source,
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std::shared_ptr<FSAccessor> accessor) override;
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void buildPaths(const PathSet & paths, BuildMode buildMode) override;
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BuildResult buildDerivation(const Path & drvPath, const BasicDerivation & drv,
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BuildMode buildMode) override;
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void ensurePath(const Path & path) override;
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void addTempRoot(const Path & path) override;
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void addIndirectRoot(const Path & path) override;
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void syncWithGC() override;
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Roots findRoots() override;
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void collectGarbage(const GCOptions & options, GCResults & results) override;
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/* Optimise the disk space usage of the Nix store by hard-linking
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files with the same contents. */
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void optimiseStore(OptimiseStats & stats);
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void optimiseStore() override;
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/* Optimise a single store path. */
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void optimisePath(const Path & path);
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bool verifyStore(bool checkContents, bool repair) override;
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/* Register the validity of a path, i.e., that `path' exists, that
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the paths referenced by it exists, and in the case of an output
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path of a derivation, that it has been produced by a successful
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execution of the derivation (or something equivalent). Also
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register the hash of the file system contents of the path. The
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hash must be a SHA-256 hash. */
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void registerValidPath(const ValidPathInfo & info);
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void registerValidPaths(const ValidPathInfos & infos);
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void vacuumDB();
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/* Repair the contents of the given path by redownloading it using
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a substituter (if available). */
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void repairPath(const Path & path);
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void addSignatures(const Path & storePath, const StringSet & sigs) override;
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static bool haveWriteAccess();
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private:
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int getSchema();
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void openDB(State & state, bool create);
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void makeStoreWritable();
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uint64_t queryValidPathId(State & state, const Path & path);
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uint64_t addValidPath(State & state, const ValidPathInfo & info, bool checkOutputs = true);
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void invalidatePath(State & state, const Path & path);
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/* Delete a path from the Nix store. */
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void invalidatePathChecked(const Path & path);
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void verifyPath(const Path & path, const PathSet & store,
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PathSet & done, PathSet & validPaths, bool repair, bool & errors);
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void updatePathInfo(State & state, const ValidPathInfo & info);
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void upgradeStore6();
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void upgradeStore7();
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PathSet queryValidPathsOld();
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ValidPathInfo queryPathInfoOld(const Path & path);
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struct GCState;
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void deleteGarbage(GCState & state, const Path & path);
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void tryToDelete(GCState & state, const Path & path);
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bool canReachRoot(GCState & state, PathSet & visited, const Path & path);
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void deletePathRecursive(GCState & state, const Path & path);
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bool isActiveTempFile(const GCState & state,
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const Path & path, const string & suffix);
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int openGCLock(LockType lockType);
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void findRoots(const Path & path, unsigned char type, Roots & roots);
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void findRuntimeRoots(PathSet & roots);
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void removeUnusedLinks(const GCState & state);
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Path createTempDirInStore();
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Path importPath(Source & source);
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void checkDerivationOutputs(const Path & drvPath, const Derivation & drv);
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typedef std::unordered_set<ino_t> InodeHash;
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InodeHash loadInodeHash();
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Strings readDirectoryIgnoringInodes(const Path & path, const InodeHash & inodeHash);
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void optimisePath_(OptimiseStats & stats, const Path & path, InodeHash & inodeHash);
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// Internal versions that are not wrapped in retry_sqlite.
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bool isValidPath_(State & state, const Path & path);
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void queryReferrers(State & state, const Path & path, PathSet & referrers);
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/* Add signatures to a ValidPathInfo using the secret keys
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specified by the ‘secret-key-files’ option. */
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void signPathInfo(ValidPathInfo & info);
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friend class DerivationGoal;
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};
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typedef std::pair<dev_t, ino_t> Inode;
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typedef set<Inode> InodesSeen;
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/* "Fix", or canonicalise, the meta-data of the files in a store path
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after it has been built. In particular:
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- the last modification date on each file is set to 1 (i.e.,
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00:00:01 1/1/1970 UTC)
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- the permissions are set of 444 or 555 (i.e., read-only with or
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without execute permission; setuid bits etc. are cleared)
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- the owner and group are set to the Nix user and group, if we're
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running as root. */
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void canonicalisePathMetaData(const Path & path, uid_t fromUid, InodesSeen & inodesSeen);
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void canonicalisePathMetaData(const Path & path, uid_t fromUid);
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void canonicaliseTimestampAndPermissions(const Path & path);
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MakeError(PathInUse, Error);
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}
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