mirror of
https://github.com/NixOS/nix
synced 2024-09-20 23:28:26 -04:00
05f0430de1
promise :-) This allows derivations to specify on *what* output paths of input derivations they are dependent. This helps to prevent unnecessary downloads. For instance, a build might be dependent on the `devel' and `lib' outputs of some library component, but not the `docs' output.
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
#include "build.hh"
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Derivation derivationFromPath(const Path & drvPath)
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{
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assertStorePath(drvPath);
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ensurePath(drvPath);
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ATerm t = ATreadFromNamedFile(drvPath.c_str());
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if (!t) throw Error(format("cannot read aterm from `%1%'") % drvPath);
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return parseDerivation(t);
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}
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void computeFSClosure(const Path & storePath,
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PathSet & paths)
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{
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if (paths.find(storePath) != paths.end()) return;
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paths.insert(storePath);
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PathSet references;
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queryReferences(storePath, references);
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for (PathSet::iterator i = references.begin();
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i != references.end(); ++i)
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computeFSClosure(*i, paths);
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}
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void storePathRequisites(const Path & storePath,
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bool includeOutputs, PathSet & paths)
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{
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checkInterrupt();
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if (paths.find(storePath) != paths.end()) return;
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if (isDerivation(storePath)) {
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paths.insert(storePath);
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Derivation drv = derivationFromPath(storePath);
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for (DerivationInputs::iterator i = drv.inputDrvs.begin();
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i != drv.inputDrvs.end(); ++i)
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/* !!! Maybe this is too strict, since it will include
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*all* output paths of the input derivation, not just
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the ones needed by this derivation. */
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storePathRequisites(i->first, includeOutputs, paths);
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for (PathSet::iterator i = drv.inputSrcs.begin();
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i != drv.inputSrcs.end(); ++i)
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storePathRequisites(*i, includeOutputs, paths);
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if (includeOutputs) {
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for (DerivationOutputs::iterator i = drv.outputs.begin();
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i != drv.outputs.end(); ++i)
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if (isValidPath(i->second.path))
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storePathRequisites(i->second.path, includeOutputs, paths);
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}
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}
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else {
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computeFSClosure(storePath, paths);
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}
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}
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