$ git clone -n https://src.fedoraproject.org/rpms/gsim85.git /var/lib/mock/f41-build-1028421-18355/root/chroot_tmpdir/scmroot/gsim85
Cloning into '/var/lib/mock/f41-build-1028421-18355/root/chroot_tmpdir/scmroot/gsim85'...
$ git fetch origin b8b8226fb63ec66968afa7f09055e9fab8543313:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gsim85
 * [new ref]         b8b8226fb63ec66968afa7f09055e9fab8543313 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8b8226 Eliminate use of obsolete %patchN syntax (#2283636)