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

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{stdenv, darcs, nix, cacert}:
{url, rev ? null, context ? null, md5 ? "", sha256 ? ""}:
if md5 != "" then
throw "fetchdarcs does not support md5 anymore, please use sha256"
else
stdenv.mkDerivation {
name = "fetchdarcs";
NIX_SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
builder = ./builder.sh;
buildInputs = [darcs];
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = sha256;
inherit url rev context;
}