e25fad691a
syncWithGC() to allow clients to register GC roots without needing write access to the global roots directory or the GC lock.
140 lines
4 KiB
C++
140 lines
4 KiB
C++
#ifndef __LOCAL_STORE_H
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#define __LOCAL_STORE_H
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#include <string>
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#include "store-api.hh"
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namespace nix {
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class Transaction;
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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 0.8. Version 3 is Nix 0.10 and
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up. */
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const int nixSchemaVersion = 3;
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extern string drvsLogDir;
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class LocalStore : public StoreAPI
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{
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public:
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/* Open the database environment. If `reserveSpace' is true, make
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sure that a big empty file exists in /nix/var/nix/db/reserved.
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If `reserveSpace' is false, delete this file if it exists. The
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idea is that on normal operation, the file exists; but when we
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run the garbage collector, it is deleted. This is to ensure
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that the garbage collector has a small amount of disk space
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available, which is required to open the Berkeley DB
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environment. */
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LocalStore(bool reserveSpace);
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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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Substitutes querySubstitutes(const Path & srcPath);
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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 addToStore(const Path & srcPath, bool fixed = false,
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bool recursive = false, string hashAlgo = "");
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Path addTextToStore(const string & suffix, const string & s,
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const PathSet & references);
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void buildDerivations(const PathSet & drvPaths);
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void ensurePath(const Path & path);
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void addTempRoot(const Path & path);
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void syncWithGC();
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};
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/* Get a transaction object. */
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void createStoreTransaction(Transaction & txn);
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/* Copy a path recursively. */
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void copyPath(const Path & src, const Path & dst);
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/* Register a substitute. */
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void registerSubstitute(const Transaction & txn,
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const Path & srcPath, const Substitute & sub);
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/* Deregister all substitutes. */
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void clearSubstitutes();
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/* Register the validity of a path, i.e., that `path' exists, that the
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paths referenced by it exists, and in the case of an output path of
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a derivation, that it has been produced by a succesful execution of
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the derivation (or something equivalent). Also register the hash
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of the file system contents of the path. The hash must be a
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SHA-256 hash. */
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void registerValidPath(const Transaction & txn,
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const Path & path, const Hash & hash, const PathSet & references,
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const Path & deriver);
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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 hash;
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PathSet references;
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};
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typedef list<ValidPathInfo> ValidPathInfos;
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void registerValidPaths(const Transaction & txn,
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const ValidPathInfos & infos);
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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 0 (i.e.,
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00:00:00 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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in a setuid Nix installation. */
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void canonicalisePathMetaData(const Path & path);
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/* Checks whether a path is valid. */
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bool isValidPathTxn(const Transaction & txn, const Path & path);
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/* Sets the set of outgoing FS references for a store path. Use with
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care! */
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void setReferences(const Transaction & txn, const Path & path,
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const PathSet & references);
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/* Sets the deriver of a store path. Use with care! */
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void setDeriver(const Transaction & txn, const Path & path,
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const Path & deriver);
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/* Query the deriver of a store path. Return the empty string if no
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deriver has been set. */
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Path queryDeriver(const Transaction & txn, const Path & path);
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/* Delete a value from the nixStore directory. */
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void deleteFromStore(const Path & path, unsigned long long & bytesFreed);
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void verifyStore(bool checkContents);
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}
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#endif /* !__LOCAL_STORE_H */
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