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* New command `nix-store --optimise' to reduce Nix store disk space

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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).
This commit is contained in:
Eelco Dolstra 2007-10-09 22:14:27 +00:00
parent 27a0662828
commit a8629de827
5 changed files with 188 additions and 99 deletions
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18
src/libstore/local-store.hh
View file

@ -21,6 +21,20 @@ 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:
@ -83,6 +97,10 @@ public:
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);
};