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

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{ lib, stdenvNoCC, mercurial }:
{ name ? null
, url
, rev ? null
, md5 ? null
, sha256 ? null
, hash ? null
, fetchSubrepos ? false
, preferLocalBuild ? true }:
if md5 != null then
throw "fetchhg does not support md5 anymore, please use sha256 or hash"
else if hash != null && sha256 != null then
throw "Only one of sha256 or hash can be set"
else
# TODO: statically check if mercurial as the https support if the url starts woth https.
stdenvNoCC.mkDerivation {
name = "hg-archive" + (lib.optionalString (name != null) "-${name}");
builder = ./builder.sh;
nativeBuildInputs = [mercurial];
impureEnvVars = lib.fetchers.proxyImpureEnvVars;
subrepoClause = lib.optionalString fetchSubrepos "S";
outputHashAlgo = if hash != null then null else "sha256";
outputHashMode = "recursive";
outputHash = if hash != null then
hash
else if sha256 != null then
sha256
else
lib.fakeSha256;
inherit url rev;
inherit preferLocalBuild;
}