$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f41-build-847147-163762/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f41-build-847147-163762/root/chroot_tmpdir/scmroot/libguestfs'...
$ git fetch origin 74d78169356abfc72105485d4e4af29d27fb80ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libguestfs
 * [new ref]         74d78169356abfc72105485d4e4af29d27fb80ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74d7816 New upstream development version 1.53.6