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optimiseStore(): Use a content-addressed file store in /nix/store/.links

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optimiseStore() now creates persistent, content-addressed hard links
in /nix/store/.links.  For instance, if it encounters a file P with
hash H, it will create a hard link

  P' = /nix/store/.link/<H>

to P if P' doesn't already exist; if P' exist, then P is replaced by a
hard link to P'.  This is better than the previous in-memory map,
because it had the tendency to unnecessarily replace hard links with a
hard link to whatever happened to be the first file with a given hash
it encountered.  It also allows on-the-fly, incremental optimisation.
This commit is contained in:
Eelco Dolstra 2012-07-23 12:08:34 -04:00
parent ed59bf7a18
commit 564fb7d9fa
3 changed files with 109 additions and 114 deletions
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10
src/nix-store/nix-store.cc
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@ -746,18 +746,12 @@ static void showOptimiseStats(OptimiseStats & stats)
files with the same contents. */
static void opOptimise(Strings opFlags, Strings opArgs)
{
if (!opArgs.empty())
if (!opArgs.empty() || !opFlags.empty())
throw UsageError("no arguments expected");
bool dryRun = false;
foreach (Strings::iterator, i, opFlags)
if (*i == "--dry-run") dryRun = true;
else throw UsageError(format("unknown flag `%1%'") % *i);
OptimiseStats stats;
try {
ensureLocalStore().optimiseStore(dryRun, stats);
ensureLocalStore().optimiseStore(stats);
} catch (...) {
showOptimiseStats(stats);
throw;