$ git clone -n https://src.fedoraproject.org/rpms/gsm.git /var/lib/mock/f41-build-1028416-18355/root/chroot_tmpdir/scmroot/gsm
Cloning into '/var/lib/mock/f41-build-1028416-18355/root/chroot_tmpdir/scmroot/gsm'...
$ git fetch origin a659f212585ec35be97180c98e90dcefc69eef7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gsm
 * [new ref]         a659f212585ec35be97180c98e90dcefc69eef7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a659f21 Eliminate use of obsolete %patchN syntax (#2283636)