forked from lix-project/lix
Automatically optimise the Nix store when a new path is added
Auto-optimisation is enabled by default. It can be turned off by setting auto-optimise-store to false in nix.conf.
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564fb7d9fa
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6193105710
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@ -338,6 +338,19 @@ build-use-chroot = /dev /proc /bin</programlisting>
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</varlistentry>
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<varlistentry><term><literal>auto-optimise-store</literal></term>
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<listitem><para>If set to <literal>true</literal> (the default),
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Nix automatically detects files in the store that have identical
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contents, and replaces them with hard links to a single copy.
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This saves disk space. If set to <literal>false</literal>, you
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can still run <command>nix-store --optimise</command> to get rid
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of duplicate files.</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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@ -2093,6 +2093,8 @@ void DerivationGoal::computeClosure()
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if (allowed.find(*i) == allowed.end())
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throw BuildError(format("output is not allowed to refer to path `%1%'") % *i);
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}
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worker.store.optimisePath(path); // FIXME: combine with scanForReferences()
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}
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/* Register each output path as valid, and register the sets of
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@ -2546,6 +2548,8 @@ void SubstitutionGoal::finished()
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HashResult hash = hashPath(htSHA256, storePath);
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worker.store.optimisePath(storePath); // FIXME: combine with hashPath()
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ValidPathInfo info2;
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info2.path = storePath;
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info2.hash = hash.first;
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@ -209,6 +209,7 @@ LocalStore::LocalStore(bool reserveSpace)
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/* Create missing state directories if they don't already exist. */
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createDirs(nixStore);
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createDirs(linksDir = nixStore + "/.links");
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Path profilesDir = nixStateDir + "/profiles";
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createDirs(nixStateDir + "/profiles");
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createDirs(nixStateDir + "/temproots");
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@ -1117,6 +1118,8 @@ Path LocalStore::addToStoreFromDump(const string & dump, const string & name,
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} else
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hash = hashPath(htSHA256, dstPath);
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optimisePath(dstPath); // FIXME: combine with hashPath()
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ValidPathInfo info;
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info.path = dstPath;
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info.hash = hash.first;
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@ -1171,6 +1174,8 @@ Path LocalStore::addTextToStore(const string & name, const string & s,
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HashResult hash = hashPath(htSHA256, dstPath);
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optimisePath(dstPath);
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ValidPathInfo info;
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info.path = dstPath;
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info.hash = hash.first;
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@ -1406,6 +1411,8 @@ Path LocalStore::importPath(bool requireSignature, Source & source)
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here. */
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HashResult hash = hashPath(htSHA256, dstPath);
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optimisePath(dstPath); // FIXME: combine with hashPath()
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ValidPathInfo info;
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info.path = dstPath;
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info.hash = hash.first;
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@ -86,6 +86,8 @@ private:
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typedef std::map<Path, RunningSubstituter> RunningSubstituters;
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RunningSubstituters runningSubstituters;
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Path linksDir;
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public:
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/* Initialise the local store, upgrading the schema if
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@ -169,6 +171,9 @@ public:
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files with the same contents. */
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void optimiseStore(OptimiseStats & stats);
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/* Optimise a single store path. */
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void optimisePath(const Path & path);
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/* Check the integrity of the Nix store. */
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void verifyStore(bool checkContents);
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@ -267,6 +272,8 @@ private:
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Path importPath(bool requireSignature, Source & source);
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void checkDerivationOutputs(const Path & drvPath, const Derivation & drv);
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void optimisePath_(OptimiseStats & stats, const Path & path);
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};
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@ -49,10 +49,7 @@ struct MakeImmutable
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};
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const string linksDir = ".links";
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static void hashAndLink(OptimiseStats & stats, const Path & path)
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void LocalStore::optimisePath_(OptimiseStats & stats, const Path & path)
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{
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struct stat st;
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if (lstat(path.c_str(), &st))
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@ -61,7 +58,7 @@ static void hashAndLink(OptimiseStats & stats, const Path & path)
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if (S_ISDIR(st.st_mode)) {
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Strings names = readDirectory(path);
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foreach (Strings::iterator, i, names)
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hashAndLink(stats, path + "/" + *i);
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optimisePath_(stats, path + "/" + *i);
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return;
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}
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@ -91,7 +88,7 @@ static void hashAndLink(OptimiseStats & stats, const Path & path)
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printMsg(lvlDebug, format("`%1%' has hash `%2%'") % path % printHash(hash));
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/* Check if this is a known hash. */
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Path linkPath = nixStore + "/" + linksDir + "/" + printHash32(hash);
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Path linkPath = linksDir + "/" + printHash32(hash);
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if (!pathExists(linkPath)) {
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/* Nope, create a hard link in the links directory. */
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@ -177,15 +174,22 @@ static void hashAndLink(OptimiseStats & stats, const Path & path)
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void LocalStore::optimiseStore(OptimiseStats & stats)
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{
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createDirs(nixStore + "/" + linksDir);
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PathSet paths = queryValidPaths();
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foreach (PathSet::iterator, i, paths) {
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addTempRoot(*i);
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if (!isValidPath(*i)) continue; /* path was GC'ed, probably */
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startNest(nest, lvlChatty, format("hashing files in `%1%'") % *i);
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hashAndLink(stats, *i);
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optimisePath_(stats, *i);
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}
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}
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void LocalStore::optimisePath(const Path & path)
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{
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if (queryBoolSetting("auto-optimise-store", true)) {
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OptimiseStats stats;
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optimisePath_(stats, path);
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}
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}
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