nix-scripts/artiq/pkgs/artiq-version.nix

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{ stdenv, git, fetchgit }:
let
artiq-version = stdenv.mkDerivation {
name = "artiq-version";
src = import ./artiq-src.nix { inherit fetchgit; };
buildPhase = ''
REV=`${git}/bin/git rev-parse HEAD`
'';
installPhase = ''
echo -n 5e.`cut -c1-8 <<< $REV` > $out
'';
};
in
builtins.readFile artiq-version