nixpkgs/pkgs/build-support/fetchegg/default.nix

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# Fetches a chicken egg from henrietta using `chicken-install -r'
# See: http://wiki.call-cc.org/chicken-projects/egg-index-4.html
{ stdenvNoCC, chicken }:
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{ name, version, md5 ? "", sha256 ? "" }:
if md5 != "" then
throw "fetchegg does not support md5 anymore, please use sha256"
else
stdenvNoCC.mkDerivation {
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name = "chicken-${name}-export-${version}";
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builder = ./builder.sh;
nativeBuildInputs = [ chicken ];
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outputHashAlgo = "sha256";
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outputHashMode = "recursive";
outputHash = sha256;
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inherit version;
eggName = name;
impureEnvVars = stdenvNoCC.lib.fetchers.proxyImpureEnvVars;
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}