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daemon: optimizePath: Detect some .links corruptions. 

If automatic store optimisation is enabled, and a hard-linked file in
the store gets corrupted, then the corresponding .links entry will
also be corrupted. In that case, trying to repair with --repair or
--repair-path won't work, because the new "good" file will be replaced
by a hard link to the corrupted file. We can catch most of these cases
by doing a sanity-check on the file sizes.
This commit is contained in:
Eelco Dolstra 2015-11-09 20:48:09 +01:00 committed by Ludovic Courtès
parent 14fb686a21
commit e134baae77
1 changed files with 9 additions and 2 deletions
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11
nix/libstore/optimise-store.cc
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@ -120,7 +120,7 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
return;
}
/* This can still happen on top-level files */
/* This can still happen on top-level files. */
if (st.st_nlink > 1 && inodeHash.count(st.st_ino)) {
printMsg(lvlDebug, format("`%1%' is already linked, with %2% other file(s).") % path % (st.st_nlink - 2));
return;
@ -141,6 +141,7 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
/* Check if this is a known hash. */
Path linkPath = linksDir + "/" + printHash32(hash);
retry:
if (!pathExists(linkPath)) {
/* Nope, create a hard link in the links directory. */
if (link(path.c_str(), linkPath.c_str()) == 0) {
@ -164,7 +165,13 @@ void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path, InodeHa
return;
}
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % linkPath);
if (st.st_size != stLink.st_size) {
printMsg(lvlError, format("removing corrupted link ‘%1%’") % linkPath);
unlink(linkPath.c_str());
goto retry;
}
printMsg(lvlTalkative, format("linking ‘%1%’ to ‘%2%’") % path % linkPath);
/* Make the containing directory writable, but only if it's not
the store itself (we don't want or need to mess with its