$ git clone -n https://src.fedoraproject.org/rpms/xmvn.git /var/lib/mock/f41-build-2410034-25459/root/chroot_tmpdir/scmroot/xmvn
Cloning into '/var/lib/mock/f41-build-2410034-25459/root/chroot_tmpdir/scmroot/xmvn'...
$ git fetch origin e6bc8079258c8b331283ca26df82d01a03a6a994:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmvn
 * [new ref]         e6bc8079258c8b331283ca26df82d01a03a6a994 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6bc807 Port to commons-compress 1.27