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| author | Nikolay Amiantov <ab@fmap.me> | 2016-04-14 18:13:50 +0300 |
|---|---|---|
| committer | Nikolay Amiantov <ab@fmap.me> | 2016-04-25 13:22:41 +0300 |
| commit | 7d3e75827bc20d50a3b9172ed8891e5bffb30c93 (patch) | |
| tree | a778c5829a8e3945dec00cbc570bc6c204c11855 /lib/attrsets.nix | |
| parent | 5f3987f44f81d2ca7bae266cdb1b26bd6d50b6c8 (diff) | |
getOutput function: init
Diffstat (limited to 'lib/attrsets.nix')
| -rw-r--r-- | lib/attrsets.nix | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/attrsets.nix b/lib/attrsets.nix index 4161fa546c8f..9104ff35d194 100644 --- a/lib/attrsets.nix +++ b/lib/attrsets.nix @@ -438,6 +438,18 @@ rec { overrideExisting = old: new: old // listToAttrs (map (attr: nameValuePair attr (attrByPath [attr] old.${attr} new)) (attrNames old)); + /* Get a package output. + If no output is found, fallback to `.out` and then to the default. + + Example: + getOutput "dev" pkgs.openssl + => "/nix/store/9rz8gxhzf8sw4kf2j2f1grr49w8zx5vj-openssl-1.0.1r-dev" + */ + getOutput = output: pkg: + if pkg.outputUnspecified or false + then pkg.${output} or pkg.out or pkg + else pkg; + /*** deprecated stuff ***/ |