forked from lix-project/lix
* `nix-store -qb' to query derivation environment bindings. Useful
for finding build-time dependencies (possibly after a build). E.g., $ nix-store -qb aterm $(nix-store -qd $(which strc)) /nix/store/jw7c7s65n1gwhxpn35j9rgcci6ilzxym-aterm-2.3.1 * Arguments to nix-store can be files within store objects, e.g., /nix/store/jw7c...-aterm-2.3.1/bin/baffle. * Idem for garbage collector roots.
This commit is contained in:
parent
450c358e20
commit
fbc434ee4c
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@ -60,7 +60,7 @@ void createSymlink(const Path & link, const Path & target, bool careful)
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/* Remove the old symlink. */
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if (pathExists(link)) {
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if (careful && (!isLink(link) || !isStorePath(readLink(link))))
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if (careful && (!isLink(link) || !isInStore(readLink(link))))
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throw Error(format("cannot create symlink `%1%'; already exists") % link);
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unlink(link.c_str());
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}
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@ -250,10 +250,10 @@ static void findRoots(const Path & path, bool recurseSymlinks,
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string target = readLink(path);
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Path target2 = absPath(target, dirOf(path));
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if (isStorePath(target2)) {
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if (isInStore(target2)) {
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debug(format("found root `%1%' in `%2%'")
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% target2 % path);
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roots.insert(target2);
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roots.insert(toStorePath(target2));
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}
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else if (recurseSymlinks) {
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@ -176,12 +176,18 @@ void copyPath(const Path & src, const Path & dst)
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}
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bool isStorePath(const Path & path)
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bool isInStore(const Path & path)
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{
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return path[0] == '/'
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&& path.compare(0, nixStore.size(), nixStore) == 0
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&& path.size() >= nixStore.size() + 2
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&& path[nixStore.size()] == '/'
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&& path[nixStore.size()] == '/';
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}
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bool isStorePath(const Path & path)
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{
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return isInStore(path)
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&& path.find('/', nixStore.size() + 1) == Path::npos;
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}
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@ -193,6 +199,18 @@ void assertStorePath(const Path & path)
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}
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Path toStorePath(const Path & path)
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{
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if (!isInStore(path))
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throw Error(format("path `%1%' is not in the Nix store") % path);
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unsigned int slash = path.find('/', nixStore.size() + 1);
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if (slash == Path::npos)
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return path;
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else
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return Path(path, 0, slash);
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}
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void canonicalisePathMetaData(const Path & path)
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{
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checkInterrupt();
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@ -63,8 +63,13 @@ void registerValidPath(const Transaction & txn,
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/* Throw an exception if `path' is not directly in the Nix store. */
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void assertStorePath(const Path & path);
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bool isInStore(const Path & path);
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bool isStorePath(const Path & path);
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/* Chop off the parts after the top-level store name, e.g.,
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/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
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Path toStorePath(const Path & path);
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/* "Fix", or canonicalise, the meta-data of the files in a store path
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after it has been built. In particular:
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- the last modification date on each file is set to 0 (i.e.,
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@ -32,15 +32,15 @@ static Path findOutput(const Derivation & drv, string id)
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}
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static Path followSymlinks(Path & path)
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static Path fixPath(Path path)
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{
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path = absPath(path);
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while (!isStorePath(path)) {
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if (!isLink(path)) return path;
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while (!isInStore(path)) {
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if (!isLink(path)) break;
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string target = readLink(path);
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path = absPath(target, dirOf(path));
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}
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return path;
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return toStorePath(path);
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}
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@ -76,7 +76,7 @@ static void opRealise(Strings opFlags, Strings opArgs)
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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*i = followSymlinks(*i);
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*i = fixPath(*i);
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if (opArgs.size() > 1) {
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PathSet drvPaths;
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@ -162,19 +162,27 @@ static void printPathSet(const PathSet & paths)
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static void opQuery(Strings opFlags, Strings opArgs)
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{
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enum { qOutputs, qRequisites, qReferences, qReferers,
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qReferersClosure, qDeriver, qGraph } query = qOutputs;
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qReferersClosure, qDeriver, qBinding, qGraph } query = qOutputs;
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bool useOutput = false;
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bool includeOutputs = false;
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bool forceRealise = false;
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string bindingName;
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for (Strings::iterator i = opFlags.begin();
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i != opFlags.end(); i++)
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i != opFlags.end(); ++i)
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if (*i == "--outputs") query = qOutputs;
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else if (*i == "--requisites" || *i == "-R") query = qRequisites;
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else if (*i == "--references") query = qReferences;
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else if (*i == "--referers") query = qReferers;
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else if (*i == "--referers-closure") query = qReferersClosure;
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else if (*i == "--deriver" || *i == "-d") query = qDeriver;
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else if (*i == "--binding" || *i == "-b") {
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if (opArgs.size() == 0)
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throw UsageError("expected binding name");
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bindingName = opArgs.front();
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opArgs.pop_front();
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query = qBinding;
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}
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else if (*i == "--graph") query = qGraph;
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else if (*i == "--use-output" || *i == "-u") useOutput = true;
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else if (*i == "--force-realise" || *i == "-f") forceRealise = true;
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@ -187,7 +195,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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*i = followSymlinks(*i);
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*i = fixPath(*i);
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if (forceRealise) realisePath(*i);
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Derivation drv = derivationFromPath(*i);
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cout << format("%1%\n") % findOutput(drv, "out");
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@ -203,7 +211,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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*i = followSymlinks(*i);
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*i = fixPath(*i);
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Path path = maybeUseOutput(*i, useOutput, forceRealise);
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if (query == qRequisites)
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storePathRequisites(path, includeOutputs, paths);
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@ -219,13 +227,26 @@ static void opQuery(Strings opFlags, Strings opArgs)
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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*i = followSymlinks(*i);
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*i = fixPath(*i);
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Path deriver = queryDeriver(noTxn, *i);
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cout << format("%1%\n") %
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(deriver == "" ? "unknown-deriver" : deriver);
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}
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break;
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case qBinding:
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for (Strings::iterator i = opArgs.begin();
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i != opArgs.end(); i++)
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{
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*i = fixPath(*i);
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Derivation drv = derivationFromPath(*i);
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StringPairs::iterator j = drv.env.find(bindingName);
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if (j == drv.env.end())
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throw Error(format("derivation `%1%' has no environment binding named `%2%'")
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% *i % bindingName);
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cout << format("%1%\n") % j->second;
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}
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break;
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#if 0
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case qGraph: {
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