$ git clone -n https://src.fedoraproject.org/rpms/python-mutatormath.git /var/lib/mock/f42-build-3487067-45834/root/chroot_tmpdir/scmroot/python-mutatormath
Cloning into '/var/lib/mock/f42-build-3487067-45834/root/chroot_tmpdir/scmroot/python-mutatormath'...
$ git fetch origin 41ffa19077b4c57356b710b79ab2b960a56cfaee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mutatormath
 * [new ref]         41ffa19077b4c57356b710b79ab2b960a56cfaee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 41ffa19 Orphaned for 6+ weeks