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* nix-store --optimise: flag "--dry-run" to just query what the disk

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savings would be.
This commit is contained in:
Eelco Dolstra 2007-10-10 13:43:04 +00:00
parent a8629de827
commit 315183f194
2 changed files with 24 additions and 16 deletions
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33
src/libstore/local-store.cc
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@ -1016,25 +1016,30 @@ static void hashAndLink(bool dryRun, HashToPath & hashToPath,
return;
}
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % prevPath.first);
if (!dryRun) {
printMsg(lvlTalkative, format("linking `%1%' to `%2%'") % path % prevPath.first);
Path tempLink = (format("%1%.tmp-%2%-%3%")
% path % getpid() % rand()).str();
Path tempLink = (format("%1%.tmp-%2%-%3%")
% path % getpid() % rand()).str();
toggleWritable(dirOf(path), true);
toggleWritable(dirOf(path), true);
if (link(prevPath.first.c_str(), tempLink.c_str()) == -1)
throw SysError(format("cannot link `%1%' to `%2%'")
% tempLink % prevPath.first);
if (link(prevPath.first.c_str(), tempLink.c_str()) == -1)
throw SysError(format("cannot link `%1%' to `%2%'")
% tempLink % prevPath.first);
/* Atomically replace the old file with the new hard link. */
if (rename(tempLink.c_str(), path.c_str()) == -1)
throw SysError(format("cannot rename `%1%' to `%2%'")
% tempLink % path);
/* Atomically replace the old file with the new hard link. */
if (rename(tempLink.c_str(), path.c_str()) == -1)
throw SysError(format("cannot rename `%1%' to `%2%'")
% tempLink % path);
/* Make the directory read-only again and reset its timestamp
back to 0. */
_canonicalisePathMetaData(dirOf(path), false);
/* Make the directory read-only again and reset its
timestamp back to 0. */
_canonicalisePathMetaData(dirOf(path), false);
} else
printMsg(lvlTalkative, format("would link `%1%' to `%2%'") % path % prevPath.first);
stats.filesLinked++;
stats.bytesFreed += st.st_size;