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* Garbage collector: option `--max-freed' to stop after at least N

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bytes have been freed, `--max-links' to stop when the Nix store
  directory has fewer than N hard links (the latter being important
  for very large Nix stores on filesystems with a 32000 subdirectories
  limit).
This commit is contained in:
Eelco Dolstra 2008-06-18 14:20:16 +00:00
parent a8f3b02092
commit d3aa183beb
6 changed files with 47 additions and 12 deletions
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25
src/libstore/gc.cc
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@ -439,6 +439,9 @@ Paths topoSortPaths(const PathSet & paths)
}
struct GCLimitReached { };
void LocalStore::tryToDelete(const GCOptions & options, GCResults & results,
const PathSet & livePaths, const PathSet & tempRootsClosed, PathSet & done,
const Path & path)
@ -512,6 +515,21 @@ void LocalStore::tryToDelete(const GCOptions & options, GCResults & results,
results.bytesFreed += bytesFreed;
results.blocksFreed += blocksFreed;
if (results.bytesFreed > options.maxFreed) {
printMsg(lvlInfo, format("deleted more than %1% bytes; stopping") % options.maxFreed);
throw GCLimitReached();
}
if (options.maxLinks) {
struct stat st;
if (stat(nixStore.c_str(), &st) == -1)
throw SysError(format("statting `%1%'") % nixStore);
if (st.st_nlink < options.maxLinks) {
printMsg(lvlInfo, format("link count on the store has dropped below %1%; stopping") % options.maxLinks);
throw GCLimitReached();
}
}
#ifndef __CYGWIN__
if (fdLock != -1)
/* Write token to stale (deleted) lock file. */
@ -650,8 +668,11 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
: format("deleting garbage..."));
PathSet done;
foreach (PathSet::iterator, i, storePaths)
tryToDelete(options, results, livePaths, tempRootsClosed, done, *i);
try {
foreach (PathSet::iterator, i, storePaths)
tryToDelete(options, results, livePaths, tempRootsClosed, done, *i);
} catch (GCLimitReached & e) {
}
}