$ git clone -n https://src.fedoraproject.org/rpms/xca.git /var/lib/mock/f40-build-1292832-23380/root/chroot_tmpdir/scmroot/xca
Cloning into '/var/lib/mock/f40-build-1292832-23380/root/chroot_tmpdir/scmroot/xca'...
$ git fetch origin 91fa1a80c5660e869d3047de662030c0eb143a29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xca
 * [new ref]         91fa1a80c5660e869d3047de662030c0eb143a29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91fa1a8 Fix application icon.