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

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# You can specify some extra mirrors and a cache DB via options
{stdenv, monotone, defaultDBMirrors ? [], cacheDB ? "./mtn-checkout.db"}:
# dbs is a list of strings
# each is an url for sync
# selector is mtn selector, like h:org.example.branch
#
{name ? "mtn-checkout", dbs ? [], sha256
, selector ? "h:" + branch, branch}:
stdenv.mkDerivation {
builder = ./builder.sh;
nativeBuildInputs = [monotone];
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = sha256;
dbs = defaultDBMirrors ++ dbs;
inherit branch cacheDB name selector;
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"
];
}