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

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{stdenv, git}:
{url, rev ? "HEAD", md5 ? "", sha256 ? "", depth ? 1}:
stdenv.mkDerivation {
name = "git-export";
builder = ./builder.sh;
buildInputs = [git];
outputHashAlgo = if sha256 == "" then "md5" else "sha256";
outputHashMode = "recursive";
outputHash = if sha256 == "" then md5 else sha256;
inherit url rev depth;
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"
];
}