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

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{stdenv, mercurial, nix}: {name ? null, url, tag ? null, md5 ? null, sha256 ? null}:
# TODO: statically check if mercurial as the https support if the url starts woth https.
stdenv.mkDerivation {
name = "hg-archive" + (if name != null then "-${name}" else "");
builder = ./builder.sh;
buildInputs = [mercurial];
# Nix <= 0.7 compatibility.
id = md5;
outputHashAlgo = if md5 != null then "md5" else "sha256";
outputHashMode = "recursive";
outputHash = if md5 != null then md5 else sha256;
inherit url tag;
preferLocalBuild = true;
}