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{ lib, fetchgit, fetchzip }:
{ owner, repo, rev, name ? "source"
, fetchSubmodules ? false, private ? false
, githubBase ? "github.com", varPrefix ? null
, ... # For hash agility
}@args: assert private -> !fetchSubmodules;
let
baseUrl = "https://${githubBase}/${owner}/${repo}";
passthruAttrs = removeAttrs args [ "owner" "repo" "rev" "fetchSubmodules" "private" "githubBase" "varPrefix" ];
varBase = "NIX${if varPrefix == null then "" else "_${varPrefix}"}_GITHUB_PRIVATE_";
# We prefer fetchzip in cases we don't need submodules as the hash
# is more stable in that case.
fetcher = if fetchSubmodules then fetchgit else fetchzip;
privateAttrs = lib.optionalAttrs private {
netrcPhase = ''
if [ -z "''$${varBase}USERNAME" -o -z "''$${varBase}PASSWORD" ]; then
echo "Error: Private fetchFromGitHub requires the nix building process (nix-daemon in multi user mode) to have the ${varBase}USERNAME and ${varBase}PASSWORD env vars set." >&2
exit 1
fi
cat > netrc <<EOF
machine ${githubBase}
login ''$${varBase}USERNAME
password ''$${varBase}PASSWORD
EOF
'';
netrcImpureEnvVars = [ "${varBase}USERNAME" "${varBase}PASSWORD" ];
};
fetcherArgs = (if fetchSubmodules
then { inherit rev fetchSubmodules; url = "${baseUrl}.git"; }
else ({ url = "${baseUrl}/archive/${rev}.tar.gz"; } // privateAttrs)
) // passthruAttrs // { inherit name; };
in fetcher fetcherArgs // { meta.homepage = baseUrl; inherit rev; }
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