344 lines
9.5 KiB
C++
344 lines
9.5 KiB
C++
#pragma once
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#include <string>
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#include <unordered_set>
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#include "store-api.hh"
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#include "util.hh"
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#include "pathlocks.hh"
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class sqlite3;
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class sqlite3_stmt;
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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. */
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const int nixSchemaVersion = 7;
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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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struct RunningSubstituter
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{
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Path program;
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Pid pid;
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AutoCloseFD to, from, error;
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FdSource fromBuf;
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bool disabled;
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RunningSubstituter() : disabled(false) { };
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};
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/* Wrapper object to close the SQLite database automatically. */
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struct SQLite
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{
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sqlite3 * db;
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SQLite() { db = 0; }
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~SQLite();
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operator sqlite3 * () { return db; }
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};
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/* Wrapper object to create and destroy SQLite prepared statements. */
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struct SQLiteStmt
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{
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sqlite3 * db;
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sqlite3_stmt * stmt;
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unsigned int curArg;
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SQLiteStmt() { stmt = 0; }
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void create(sqlite3 * db, const string & s);
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void reset();
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~SQLiteStmt();
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operator sqlite3_stmt * () { return stmt; }
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void bind(const string & value);
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void bind(int value);
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void bind64(long long value);
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void bind();
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};
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class LocalStore : public StoreAPI
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{
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private:
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typedef std::map<Path, RunningSubstituter> RunningSubstituters;
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RunningSubstituters runningSubstituters;
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Path linksDir;
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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(bool reserveSpace = true);
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~LocalStore();
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/* Implementations of abstract store API methods. */
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bool isValidPath(const Path & path);
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PathSet queryValidPaths(const PathSet & paths);
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PathSet queryAllValidPaths();
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ValidPathInfo queryPathInfo(const Path & path);
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Hash queryPathHash(const Path & path);
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void queryReferences(const Path & path, PathSet & references);
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void queryReferrers(const Path & path, PathSet & referrers);
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Path queryDeriver(const Path & path);
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PathSet queryValidDerivers(const Path & path);
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PathSet queryDerivationOutputs(const Path & path);
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StringSet queryDerivationOutputNames(const Path & path);
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Path queryPathFromHashPart(const string & hashPart);
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PathSet querySubstitutablePaths(const PathSet & paths);
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void querySubstitutablePathInfos(const Path & substituter,
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PathSet & paths, SubstitutablePathInfos & infos);
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void querySubstitutablePathInfos(const PathSet & paths,
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SubstitutablePathInfos & infos);
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Path addToStore(const Path & srcPath,
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bool recursive = true, HashType hashAlgo = htSHA256,
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PathFilter & filter = defaultPathFilter, bool repair = false);
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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);
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void exportPath(const Path & path, bool sign,
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Sink & sink);
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Paths importPaths(bool requireSignature, Source & source);
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void buildPaths(const PathSet & paths, BuildMode buildMode);
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void ensurePath(const Path & path);
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void addTempRoot(const Path & path);
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void addIndirectRoot(const Path & path);
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void syncWithGC();
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Roots findRoots();
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void collectGarbage(const GCOptions & options, GCResults & results);
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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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/* Generic variant of the above method. */
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void optimiseStore();
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/* Optimise a single store path. */
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void optimisePath(const Path & path);
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/* Check the integrity of the Nix store. Returns true if errors
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remain. */
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bool verifyStore(bool checkContents, bool repair);
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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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/* Register that the build of a derivation with output `path' has
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failed. */
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void registerFailedPath(const Path & path);
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/* Query whether `path' previously failed to build. */
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bool hasPathFailed(const Path & path);
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PathSet queryFailedPaths();
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void clearFailedPaths(const PathSet & paths);
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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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/* Check whether the given valid path exists and has the right
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contents. */
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bool pathContentsGood(const Path & path);
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void markContentsGood(const Path & path);
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void setSubstituterEnv();
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private:
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Path schemaPath;
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/* Lock file used for upgrading. */
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AutoCloseFD globalLock;
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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 stmtRegisterFailedPath;
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SQLiteStmt stmtHasPathFailed;
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SQLiteStmt stmtQueryFailedPaths;
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SQLiteStmt stmtClearFailedPath;
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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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/* Cache for pathContentsGood(). */
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std::map<Path, bool> pathContentsGoodCache;
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bool didSetSubstituterEnv;
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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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int getSchema();
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void openDB(bool create);
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void makeStoreWritable();
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unsigned long long queryValidPathId(const Path & path);
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unsigned long long addValidPath(const ValidPathInfo & info, bool checkOutputs = true);
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void addReference(unsigned long long referrer, unsigned long long reference);
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void appendReferrer(const Path & from, const Path & to, bool lock);
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void rewriteReferrers(const Path & path, bool purge, PathSet referrers);
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void invalidatePath(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(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 removeUnusedLinks(const GCState & state);
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void startSubstituter(const Path & substituter,
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RunningSubstituter & runningSubstituter);
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string getLineFromSubstituter(RunningSubstituter & run);
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template<class T> T getIntLineFromSubstituter(RunningSubstituter & run);
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Path createTempDirInStore();
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Path importPath(bool requireSignature, 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_(const Path & path);
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void queryReferrers_(const Path & path, PathSet & referrers);
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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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