$ git clone -n https://src.fedoraproject.org/rpms/gkrellm-top.git /var/lib/mock/f41-build-1285026-23248/root/chroot_tmpdir/scmroot/gkrellm-top
Cloning into '/var/lib/mock/f41-build-1285026-23248/root/chroot_tmpdir/scmroot/gkrellm-top'...
$ git fetch origin 5c7dd11e81e80370827cfbb841b8aabd006009c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gkrellm-top
 * [new ref]         5c7dd11e81e80370827cfbb841b8aabd006009c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c7dd11 Eliminate use of obsolete %patchN syntax (#2283636)