tvl-depot/corepkgs/derivation.nix
Eelco Dolstra 46a369ad95 Make "nix-build -A <derivation>.<output>" do the right thing
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.
2012-11-26 15:39:10 +01:00

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/* This is the implementation of the derivation builtin function.
It's actually a wrapper around the derivationStrict primop. */
drvAttrs @ { outputs ? [ "out" ], ... }:
let
strict = derivationStrict drvAttrs;
commonAttrs = drvAttrs // (builtins.listToAttrs outputsList) //
{ all = map (x: x.value) outputsList;
inherit drvAttrs;
};
outputToAttrListElement = outputName:
{ name = outputName;
value = commonAttrs // {
outPath = builtins.getAttr outputName strict;
drvPath = strict.drvPath;
type = "derivation";
inherit outputName;
};
};
outputsList = map outputToAttrListElement outputs;
in (builtins.head outputsList).value