lunaphied/lix
0
0
Fork 0
forked from lix-project/lix
Code Pull requests Activity
lix/src/libstore/gc.hh

27 lines
1.1 KiB
C++
Raw Normal View History

* Put the garbage collector in nix-store: operation `--gc', suboperations `--print-live', `--print-dead', and `--delete'. The roots are not determined by nix-store; they are read from standard input. This is to make it easy to customise what the roots are. The collector now no longer fails when store expressions are missing (which legally happens when using substitutes). It never tries to fetch paths through substitutes. TODO: acquire a global lock on the store while garbage collecting. * Removed `nix-store --delete'.
2004-08-25 11:43:49 +00:00
#ifndef __GC_H
#define __GC_H
* Renamed `normalise.cc' -> `build.cc', `storeexprs.cc' -> `derivations.cc', etc. * Store the SHA-256 content hash of store paths in the database after they have been built/added. This is so that we can check whether the store has been messed with (a la `rpm --verify'). * When registering path validity, verify that the closure property holds.
2005-01-19 16:39:47 +00:00
#include "util.hh"
* Put the garbage collector in nix-store: operation `--gc', suboperations `--print-live', `--print-dead', and `--delete'. The roots are not determined by nix-store; they are read from standard input. This is to make it easy to customise what the roots are. The collector now no longer fails when store expressions are missing (which legally happens when using substitutes). It never tries to fetch paths through substitutes. TODO: acquire a global lock on the store while garbage collecting. * Removed `nix-store --delete'.
2004-08-25 11:43:49 +00:00
/* Determine the set of "live" store paths, given a set of root store
expressions. The live store paths are those that are reachable
from the roots. The roots are reachable by definition. Any path
mentioned in a reachable store expression is also reachable. If a
derivation store expression is reachable, then its successor (if it
exists) if also reachable. It is not an error for store
expressions not to exist (since this can happen on derivation store
expressions, for instance, due to the substitute mechanism), but
successor links are followed even for non-existant derivations. */
PathSet findLivePaths(const Paths & roots);
/* Given a set of "live" store paths, determine the set of "dead"
store paths (which are simply all store paths that are not in the
* `--min-age' flag in nix-store and nix-collect-garbage to only delete unreachable paths that haven't been used for N hours. For instance, `nix-collect-garbage --min-age 168' only deletes paths that haven't been accessed in the last week. This is useful for instance in the build farm where many derivations can be shared between consecutive builds, and we wouldn't want a garbage collect to throw them all away. We could of course register them as roots, but then we'd to unregister them at some point, which would be a pain to manage. The `--min-age' flag gives us a sort of MRU caching scheme. BUG: this really shouldn't be in gc.cc since that violates mechanism/policy separation.
2004-08-25 16:54:08 +00:00
live set). The value `minAge' specifies the minimum age in seconds
for an unreachable file to be considered dead (0 meaning that any
unreachable file is dead). */
PathSet findDeadPaths(const PathSet & live, time_t minAge);
* Put the garbage collector in nix-store: operation `--gc', suboperations `--print-live', `--print-dead', and `--delete'. The roots are not determined by nix-store; they are read from standard input. This is to make it easy to customise what the roots are. The collector now no longer fails when store expressions are missing (which legally happens when using substitutes). It never tries to fetch paths through substitutes. TODO: acquire a global lock on the store while garbage collecting. * Removed `nix-store --delete'.
2004-08-25 11:43:49 +00:00
#endif /* !__GC_H */
Copy permalink