$ git clone -n https://src.fedoraproject.org/rpms/git-xcleaner.git /var/lib/mock/f41-build-side-1-2637558-26328/root/chroot_tmpdir/scmroot/git-xcleaner
Cloning into '/var/lib/mock/f41-build-side-1-2637558-26328/root/chroot_tmpdir/scmroot/git-xcleaner'...
$ git fetch origin cb5777af80fcaae99eb0f7c34fb553f964912300:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git-xcleaner
 * [new ref]         cb5777af80fcaae99eb0f7c34fb553f964912300 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb5777a convert GPLv2 license to SPDX