$ git clone -n https://src.fedoraproject.org/rpms/kstart.git /var/lib/mock/f41-build-1052144-19246/root/chroot_tmpdir/scmroot/kstart
Cloning into '/var/lib/mock/f41-build-1052144-19246/root/chroot_tmpdir/scmroot/kstart'...
$ git fetch origin 3a0e28bddca1f4bf9dfb276a0c08927b5a94cde3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kstart
 * [new ref]         3a0e28bddca1f4bf9dfb276a0c08927b5a94cde3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a0e28b Eliminate use of obsolete %patchN syntax (#2283636)