$ git clone -n https://src.fedoraproject.org/rpms/marble.git /var/lib/mock/f42-build-side-1-3569477-46747/root/chroot_tmpdir/scmroot/marble
Cloning into '/var/lib/mock/f42-build-side-1-3569477-46747/root/chroot_tmpdir/scmroot/marble'...
$ git fetch origin 313806decf8982696a56ef84605212bdf653c543:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/marble
 * [new ref]         313806decf8982696a56ef84605212bdf653c543 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 313806d 25.04.2