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nixpkgs/pkgs/build-support/fetchegg/default.nix
2014-10-13 23:29:27 +02:00

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Nix

# Fetches a chicken egg from henrietta using `chicken-install -r'
# See: http://wiki.call-cc.org/chicken-projects/egg-index-4.html
{ stdenv, chicken }:
{ name, version, md5 ? "", sha256 ? "" }:
stdenv.mkDerivation {
name = "chicken-${name}-export";
builder = ./builder.sh;
buildInputs = [ chicken ];
outputHashAlgo = if sha256 == "" then "md5" else "sha256";
outputHashMode = "recursive";
outputHash = if sha256 == "" then md5 else sha256;
inherit version;
eggName = name;
impureEnvVars = [
# We borrow these environment variables from the caller to allow
# easy proxy configuration. This is impure, but a fixed-output
# derivation like fetchurl is allowed to do so since its result is
# by definition pure.
"http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
];
}