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Only substitute wanted outputs of a derivation

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If a derivation has multiple outputs, then we only want to download
those outputs that are actuallty needed.  So if we do "nix-build -A
openssl.man", then only the "man" output should be downloaded.
Likewise if another package depends on ${openssl.man}.

The tricky part is that different derivations can depend on different
outputs of a given derivation, so we may need to restart the
corresponding derivation goal if that happens.
This commit is contained in:
Eelco Dolstra 2012-11-26 17:15:09 +01:00
parent 46a369ad95
commit 8d8d47abd2
4 changed files with 78 additions and 22 deletions
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4
src/libstore/derivations.hh
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@ -85,7 +85,9 @@ extern DrvHashes drvHashes;
typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);
Path makeDrvPathWithOutputs(const Path & drvPath, std::set<string> outputs);
Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs);
bool wantOutput(const string & output, const std::set<string> & wanted);
}