lix/src/libstore/local-store.hh
Eelco Dolstra 74033a844f * Add indirect root registration to the protocol so that unprivileged
processes can register indirect roots.  Of course, there is still
  the problem that the garbage collector can only read the targets of
  the indirect roots when it's running as root...
2006-12-04 23:29:16 +00:00

142 lines
4 KiB
C++

#ifndef __LOCAL_STORE_H
#define __LOCAL_STORE_H
#include <string>
#include "store-api.hh"
namespace nix {
class Transaction;
/* Nix store and database schema version. Version 1 (or 0) was Nix <=
0.7. Version 2 was Nix 0.8 and 0.8. Version 3 is Nix 0.10 and
up. */
const int nixSchemaVersion = 3;
extern string drvsLogDir;
class LocalStore : public StoreAPI
{
public:
/* Open the database environment. If `reserveSpace' is true, make
sure that a big empty file exists in /nix/var/nix/db/reserved.
If `reserveSpace' is false, delete this file if it exists. The
idea is that on normal operation, the file exists; but when we
run the garbage collector, it is deleted. This is to ensure
that the garbage collector has a small amount of disk space
available, which is required to open the Berkeley DB
environment. */
LocalStore(bool reserveSpace);
~LocalStore();
/* Implementations of abstract store API methods. */
bool isValidPath(const Path & path);
Substitutes querySubstitutes(const Path & srcPath);
Hash queryPathHash(const Path & path);
void queryReferences(const Path & path, PathSet & references);
void queryReferrers(const Path & path, PathSet & referrers);
Path addToStore(const Path & srcPath, bool fixed = false,
bool recursive = false, string hashAlgo = "");
Path addTextToStore(const string & suffix, const string & s,
const PathSet & references);
void buildDerivations(const PathSet & drvPaths);
void ensurePath(const Path & path);
void addTempRoot(const Path & path);
void addIndirectRoot(const Path & path);
void syncWithGC();
};
/* Get a transaction object. */
void createStoreTransaction(Transaction & txn);
/* Copy a path recursively. */
void copyPath(const Path & src, const Path & dst);
/* Register a substitute. */
void registerSubstitute(const Transaction & txn,
const Path & srcPath, const Substitute & sub);
/* Deregister all substitutes. */
void clearSubstitutes();
/* Register the validity of a path, i.e., that `path' exists, that the
paths referenced by it exists, and in the case of an output path of
a derivation, that it has been produced by a succesful execution of
the derivation (or something equivalent). Also register the hash
of the file system contents of the path. The hash must be a
SHA-256 hash. */
void registerValidPath(const Transaction & txn,
const Path & path, const Hash & hash, const PathSet & references,
const Path & deriver);
struct ValidPathInfo
{
Path path;
Path deriver;
Hash hash;
PathSet references;
};
typedef list<ValidPathInfo> ValidPathInfos;
void registerValidPaths(const Transaction & txn,
const ValidPathInfos & infos);
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 0 (i.e.,
00:00:00 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
in a setuid Nix installation. */
void canonicalisePathMetaData(const Path & path);
/* Checks whether a path is valid. */
bool isValidPathTxn(const Transaction & txn, const Path & path);
/* Sets the set of outgoing FS references for a store path. Use with
care! */
void setReferences(const Transaction & txn, const Path & path,
const PathSet & references);
/* Sets the deriver of a store path. Use with care! */
void setDeriver(const Transaction & txn, const Path & path,
const Path & deriver);
/* Query the deriver of a store path. Return the empty string if no
deriver has been set. */
Path queryDeriver(const Transaction & txn, const Path & path);
/* Delete a value from the nixStore directory. */
void deleteFromStore(const Path & path, unsigned long long & bytesFreed);
void verifyStore(bool checkContents);
}
#endif /* !__LOCAL_STORE_H */