$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f41-build-811821-147589/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f41-build-811821-147589/root/chroot_tmpdir/scmroot/libguestfs'...
$ git fetch origin 608cf467fa82274230770a5eec8e3c282199c457:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libguestfs
 * [new ref]         608cf467fa82274230770a5eec8e3c282199c457 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 608cf46 Re-enable perl in RHEL, needed for virt-win-reg.