$ git clone -n https://src.fedoraproject.org/rpms/xcalib.git /var/lib/mock/f41-build-726070-13125/root/chroot_tmpdir/scmroot/xcalib
Cloning into '/var/lib/mock/f41-build-726070-13125/root/chroot_tmpdir/scmroot/xcalib'...
$ git fetch origin 164ea9676c369cb2a7e1aee06d2e385322db3180:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xcalib
 * [new ref]         164ea9676c369cb2a7e1aee06d2e385322db3180 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 164ea96 Eliminate use of obsolete %patchN syntax (#2283636)