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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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11
src/libstore/store.cc
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@ -363,9 +363,9 @@ void registerSubstitute(const Transaction & txn,
}
Substitutes querySubstitutes(const Path & srcPath)
Substitutes querySubstitutes(const Transaction & txn, const Path & srcPath)
{
return readSubstitutes(noTxn, srcPath);
return readSubstitutes(txn, srcPath);
}
@ -411,6 +411,13 @@ static void invalidatePath(const Path & path, Transaction & txn)
debug(format("unregistering path `%1%'") % path);
nixDB.delPair(txn, dbValidPaths, path);
/* Clear the `references' entry for this path, as well as the
inverse `referers' entries; but only if there are no
substitutes for this path. This maintains the cleanup
invariant. */
if (querySubstitutes(txn, path).size() == 0)
setReferences(txn, path, PathSet());
}