lib.attrsets.getFirstOutput

Get the first of the outputs provided by the package, or the default. This function is alligned with _overrideFirst() from the multiple-outputs.sh setup hook. Like getOutput, the function is idempotent.

Inputs

outputs

1. Function argument

pkg

2. Function argument

Type

getFirstOutput :: [String] -> Derivation -> Derivation

Examples

"${getFirstOutput [ "include" "dev" ] pkgs.openssl}"
=> "/nix/store/00000000000000000000000000000000-openssl-1.0.1r-dev"

Noogle detected

• lib.getFirstOutput

getFirstOutput =
    candidates: pkg:
    let
      outputs = builtins.filter (name: hasAttr name pkg) candidates;
      output = builtins.head outputs;
    in
    if pkg.outputSpecified or false || outputs == [ ] then pkg else pkg.${output};