$ git clone -n https://src.fedoraproject.org/rpms/knemo.git /var/lib/mock/f42-build-3384250-45084/root/chroot_tmpdir/scmroot/knemo
Cloning into '/var/lib/mock/f42-build-3384250-45084/root/chroot_tmpdir/scmroot/knemo'...
$ git fetch origin f30c504e5b36cdb01a034bd316603b1206116ea3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/knemo
 * [new ref]         f30c504e5b36cdb01a034bd316603b1206116ea3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f30c504 Orphaned for 6+ weeks