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Make "nix-build -A <derivation>.<output>" do the right thing

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For example, given a derivation with outputs "out", "man" and "bin":

  $ nix-build -A pkg

produces ./result pointing to the "out" output;

  $ nix-build -A pkg.man

produces ./result-man pointing to the "man" output;

  $ nix-build -A pkg.all

produces ./result, ./result-man and ./result-bin;

  $ nix-build -A pkg.all -A pkg2

produces ./result, ./result-man, ./result-bin and ./result-2.
This commit is contained in:
Eelco Dolstra 2012-11-26 15:39:10 +01:00
parent a3d6585c5a
commit 46a369ad95
10 changed files with 106 additions and 20 deletions
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20
src/nix-store/nix-store.cc
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@ -60,13 +60,21 @@ static Path useDeriver(Path path)
other paths it means ensure their validity. */
static PathSet realisePath(const Path & path, bool build = true)
{
if (isDerivation(path)) {
DrvPathWithOutputs p = parseDrvPathWithOutputs(path);
if (isDerivation(p.first)) {
if (build) store->buildPaths(singleton<PathSet>(path));
Derivation drv = derivationFromPath(*store, path);
Derivation drv = derivationFromPath(*store, p.first);
rootNr++;
if (p.second.empty())
foreach (DerivationOutputs::iterator, i, drv.outputs) p.second.insert(i->first);
PathSet outputs;
foreach (DerivationOutputs::iterator, i, drv.outputs) {
foreach (StringSet::iterator, j, p.second) {
DerivationOutputs::iterator i = drv.outputs.find(*j);
if (i == drv.outputs.end())
throw Error(format("derivation `%1%' does not have an output named `%2%'") % p.first % *j);
Path outPath = i->second.path;
if (gcRoot == "")
printGCWarning();
@ -103,8 +111,10 @@ static void opRealise(Strings opFlags, Strings opArgs)
else throw UsageError(format("unknown flag `%1%'") % *i);
Paths paths;
foreach (Strings::iterator, i, opArgs)
paths.push_back(followLinksToStorePath(*i));
foreach (Strings::iterator, i, opArgs) {
DrvPathWithOutputs p = parseDrvPathWithOutputs(*i);
paths.push_back(makeDrvPathWithOutputs(followLinksToStorePath(p.first), p.second));
}
unsigned long long downloadSize, narSize;
PathSet willBuild, willSubstitute, unknown;