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* Fix and simplify the garbage collector (it's still not concurrent,

Browse source 
though).  In particular it's now much easier to register a GC root.
  Just place a symlink to whatever store path it is that you want to
  keep in /nix/var/nix/gcroots.
This commit is contained in:
Eelco Dolstra 2005-01-27 15:21:29 +00:00
parent 59682e6188
commit c505702265
10 changed files with 124 additions and 109 deletions
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58
src/libstore/gc.cc
View file

@ -1,12 +1,68 @@
#include "globals.hh"
#include "gc.hh"
#include "build.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
void collectGarbage(const PathSet & roots, GCAction action,
PathSet & result)
{
result.clear();
/* !!! TODO: Acquire an exclusive lock on the gcroots directory.
This prevents the set of live paths from increasing after this
point. */
/* Determine the live paths which is just the closure of the
roots under the `references' relation. */
PathSet livePaths;
for (PathSet::const_iterator i = roots.begin(); i != roots.end(); ++i)
computeFSClosure(canonPath(*i), livePaths);
if (action == gcReturnLive) {
result = livePaths;
return;
}
/* !!! TODO: Try to acquire (without blocking) exclusive locks on
the files in the `pending' directory. Delete all files for
which we managed to acquire such a lock (since if we could get
such a lock, that means that the process that owned the file
has died). */
/* !!! TODO: Acquire shared locks on all files in the pending
directories. This prevents the set of pending paths from
increasing while we are garbage-collecting. Read the set of
pending paths from those files. */
/* Read the Nix store directory to find all currently existing
paths. */
Strings storeNames = readDirectory(nixStore);
for (Strings::iterator i = storeNames.begin(); i != storeNames.end(); ++i) {
Path path = canonPath(nixStore + "/" + *i);
if (livePaths.find(path) != livePaths.end()) {
debug(format("live path `%1%'") % path);
continue;
}
debug(format("dead path `%1%'") % path);
result.insert(path);
if (action == gcDeleteDead) {
printMsg(lvlInfo, format("deleting `%1%'") % path);
deleteFromStore(path);
}
}
}
#if 0
void followLivePaths(Path nePath, PathSet & live)
{