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* `nix-store -qb' to query derivation environment bindings. Useful

Browse source 
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:
Eelco Dolstra 2005-02-07 14:32:44 +00:00
parent 450c358e20
commit fbc434ee4c
4 changed files with 60 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

6
src/libstore/gc.cc
View file

@ -60,7 +60,7 @@ void createSymlink(const Path & link, const Path & target, bool careful)
/* Remove the old symlink. */
if (pathExists(link)) {
if (careful && (!isLink(link) || !isStorePath(readLink(link))))
if (careful && (!isLink(link) || !isInStore(readLink(link))))
throw Error(format("cannot create symlink `%1%'; already exists") % link);
unlink(link.c_str());
}
@ -250,10 +250,10 @@ static void findRoots(const Path & path, bool recurseSymlinks,
string target = readLink(path);
Path target2 = absPath(target, dirOf(path));
if (isStorePath(target2)) {
if (isInStore(target2)) {
debug(format("found root `%1%' in `%2%'")
% target2 % path);
roots.insert(target2);
roots.insert(toStorePath(target2));
}
else if (recurseSymlinks) {

22
src/libstore/store.cc
View file

@ -176,12 +176,18 @@ void copyPath(const Path & src, const Path & dst)
}
bool isStorePath(const Path & path)
bool isInStore(const Path & path)
{
return path[0] == '/'
&& path.compare(0, nixStore.size(), nixStore) == 0
&& path.size() >= nixStore.size() + 2
&& path[nixStore.size()] == '/'
&& path[nixStore.size()] == '/';
}
bool isStorePath(const Path & path)
{
return isInStore(path)
&& path.find('/', nixStore.size() + 1) == Path::npos;
}
@ -193,6 +199,18 @@ void assertStorePath(const Path & path)
}
Path toStorePath(const Path & path)
{
if (!isInStore(path))
throw Error(format("path `%1%' is not in the Nix store") % path);
unsigned int slash = path.find('/', nixStore.size() + 1);
if (slash == Path::npos)
return path;
else
return Path(path, 0, slash);
}
void canonicalisePathMetaData(const Path & path)
{
checkInterrupt();

5
src/libstore/store.hh
View file

@ -63,8 +63,13 @@ void registerValidPath(const Transaction & txn,
/* Throw an exception if `path' is not directly in the Nix store. */
void assertStorePath(const Path & path);
bool isInStore(const Path & path);
bool isStorePath(const Path & path);
/* Chop off the parts after the top-level store name, e.g.,
/nix/store/abcd-foo/bar => /nix/store/abcd-foo. */
Path toStorePath(const Path & path);
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 0 (i.e.,

43
src/nix-store/main.cc
View file

@ -32,15 +32,15 @@ static Path findOutput(const Derivation & drv, string id)
}
static Path followSymlinks(Path & path)
static Path fixPath(Path path)
{
path = absPath(path);
while (!isStorePath(path)) {
if (!isLink(path)) return path;
while (!isInStore(path)) {
if (!isLink(path)) break;
string target = readLink(path);
path = absPath(target, dirOf(path));
}
return path;
return toStorePath(path);
}
@ -76,7 +76,7 @@ static void opRealise(Strings opFlags, Strings opArgs)
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
*i = followSymlinks(*i);
*i = fixPath(*i);
if (opArgs.size() > 1) {
PathSet drvPaths;
@ -162,19 +162,27 @@ static void printPathSet(const PathSet & paths)
static void opQuery(Strings opFlags, Strings opArgs)
{
enum { qOutputs, qRequisites, qReferences, qReferers,
qReferersClosure, qDeriver, qGraph } query = qOutputs;
qReferersClosure, qDeriver, qBinding, qGraph } query = qOutputs;
bool useOutput = false;
bool includeOutputs = false;
bool forceRealise = false;
string bindingName;
for (Strings::iterator i = opFlags.begin();
i != opFlags.end(); i++)
i != opFlags.end(); ++i)
if (*i == "--outputs") query = qOutputs;
else if (*i == "--requisites" || *i == "-R") query = qRequisites;
else if (*i == "--references") query = qReferences;
else if (*i == "--referers") query = qReferers;
else if (*i == "--referers-closure") query = qReferersClosure;
else if (*i == "--deriver" || *i == "-d") query = qDeriver;
else if (*i == "--binding" || *i == "-b") {
if (opArgs.size() == 0)
throw UsageError("expected binding name");
bindingName = opArgs.front();
opArgs.pop_front();
query = qBinding;
}
else if (*i == "--graph") query = qGraph;
else if (*i == "--use-output" || *i == "-u") useOutput = true;
else if (*i == "--force-realise" || *i == "-f") forceRealise = true;
@ -187,7 +195,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
*i = followSymlinks(*i);
*i = fixPath(*i);
if (forceRealise) realisePath(*i);
Derivation drv = derivationFromPath(*i);
cout << format("%1%\n") % findOutput(drv, "out");
@ -203,7 +211,7 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
*i = followSymlinks(*i);
*i = fixPath(*i);
Path path = maybeUseOutput(*i, useOutput, forceRealise);
if (query == qRequisites)
storePathRequisites(path, includeOutputs, paths);
@ -219,13 +227,26 @@ static void opQuery(Strings opFlags, Strings opArgs)
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
*i = followSymlinks(*i);
*i = fixPath(*i);
Path deriver = queryDeriver(noTxn, *i);
cout << format("%1%\n") %
(deriver == "" ? "unknown-deriver" : deriver);
}
break;
case qBinding:
for (Strings::iterator i = opArgs.begin();
i != opArgs.end(); i++)
{
*i = fixPath(*i);
Derivation drv = derivationFromPath(*i);
StringPairs::iterator j = drv.env.find(bindingName);
if (j == drv.env.end())
throw Error(format("derivation `%1%' has no environment binding named `%2%'")
% *i % bindingName);
cout << format("%1%\n") % j->second;
}
break;
#if 0
case qGraph: {