$ git clone -n https://src.fedoraproject.org/rpms/libason.git /var/lib/mock/f41-build-1045105-19054/root/chroot_tmpdir/scmroot/libason
Cloning into '/var/lib/mock/f41-build-1045105-19054/root/chroot_tmpdir/scmroot/libason'...
$ git fetch origin 8a99573a73ad13ea51b3f5d5880b89f481bb8771:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libason
 * [new ref]         8a99573a73ad13ea51b3f5d5880b89f481bb8771 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a99573 Eliminate use of obsolete %patchN syntax (#2283636)