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

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