forked from lix-project/lix
a8629de827
usage by finding identical files in the store and hard-linking them to each other. It typically reduces the size of the store by something like 25-35%. This is what the optimise-store.pl script did, but the new command is faster and more correct (it's safe wrt garbage collection and concurrent builds).
177 lines
5 KiB
C++
177 lines
5 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 0.9. Version 3 is Nix 0.10.
|
|
Version 4 is Nix 0.11. */
|
|
const int nixSchemaVersion = 4;
|
|
|
|
|
|
extern string drvsLogDir;
|
|
|
|
|
|
struct OptimiseStats
|
|
{
|
|
unsigned long totalFiles;
|
|
unsigned long sameContents;
|
|
unsigned long filesLinked;
|
|
unsigned long long bytesFreed;
|
|
OptimiseStats()
|
|
{
|
|
totalFiles = sameContents = filesLinked = 0;
|
|
bytesFreed = 0;
|
|
}
|
|
};
|
|
|
|
|
|
class LocalStore : public StoreAPI
|
|
{
|
|
private:
|
|
bool substitutablePathsLoaded;
|
|
PathSet substitutablePaths;
|
|
|
|
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);
|
|
|
|
Hash queryPathHash(const Path & path);
|
|
|
|
void queryReferences(const Path & path, PathSet & references);
|
|
|
|
void queryReferrers(const Path & path, PathSet & referrers);
|
|
|
|
Path queryDeriver(const Path & path);
|
|
|
|
PathSet querySubstitutablePaths();
|
|
|
|
bool hasSubstitutes(const Path & path);
|
|
|
|
Path addToStore(const Path & srcPath, bool fixed = false,
|
|
bool recursive = false, string hashAlgo = "",
|
|
PathFilter & filter = defaultPathFilter);
|
|
|
|
Path addTextToStore(const string & suffix, const string & s,
|
|
const PathSet & references);
|
|
|
|
void exportPath(const Path & path, bool sign,
|
|
Sink & sink);
|
|
|
|
Path importPath(bool requireSignature, Source & source);
|
|
|
|
void buildDerivations(const PathSet & drvPaths);
|
|
|
|
void ensurePath(const Path & path);
|
|
|
|
void addTempRoot(const Path & path);
|
|
|
|
void addIndirectRoot(const Path & path);
|
|
|
|
void syncWithGC();
|
|
|
|
Roots findRoots();
|
|
|
|
void collectGarbage(GCAction action, const PathSet & pathsToDelete,
|
|
bool ignoreLiveness, PathSet & result, unsigned long long & bytesFreed);
|
|
|
|
/* Optimise the disk space usage of the Nix store by hard-linking
|
|
files with the same contents. */
|
|
void optimiseStore(bool dryRun, OptimiseStats & stats);
|
|
};
|
|
|
|
|
|
/* Get a transaction object. */
|
|
void createStoreTransaction(Transaction & txn);
|
|
|
|
/* Copy a path recursively. */
|
|
void copyPath(const Path & src, const Path & dst);
|
|
|
|
/* 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);
|
|
|
|
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);
|
|
|
|
/* Delete a value from the nixStore directory. */
|
|
void deleteFromStore(const Path & path, unsigned long long & bytesFreed);
|
|
|
|
MakeError(PathInUse, Error);
|
|
|
|
void verifyStore(bool checkContents);
|
|
|
|
/* Whether we are in build users mode. */
|
|
bool haveBuildUsers();
|
|
|
|
/* Whether we are root. */
|
|
bool amPrivileged();
|
|
|
|
/* Recursively change the ownership of `path' to the current uid. */
|
|
void getOwnership(const Path & path);
|
|
|
|
/* Like deletePath(), but changes the ownership of `path' using the
|
|
setuid wrapper if necessary (and possible). */
|
|
void deletePathWrapped(const Path & path,
|
|
unsigned long long & bytesFreed);
|
|
|
|
void deletePathWrapped(const Path & path);
|
|
|
|
}
|
|
|
|
|
|
#endif /* !__LOCAL_STORE_H */
|