$ git clone -n https://src.fedoraproject.org/rpms/rpc2.git /var/lib/mock/f41-build-775104-13519/root/chroot_tmpdir/scmroot/rpc2
Cloning into '/var/lib/mock/f41-build-775104-13519/root/chroot_tmpdir/scmroot/rpc2'...
$ git fetch origin ec99533abbf3617b4ebf98fb040f5b04e3a3fad0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpc2
 * [new ref]         ec99533abbf3617b4ebf98fb040f5b04e3a3fad0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec99533 Eliminate use of obsolete %patchN syntax (#2283636)