$ git clone -n https://src.fedoraproject.org/rpms/trellis.git /var/lib/mock/f42-build-868675-176222/root/chroot_tmpdir/scmroot/trellis
Cloning into '/var/lib/mock/f42-build-868675-176222/root/chroot_tmpdir/scmroot/trellis'...
$ git fetch origin 932cabad46c1e2db7f2d9cabe0eaba98934889af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/trellis
 * [new ref]         932cabad46c1e2db7f2d9cabe0eaba98934889af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 932caba update to newer snapshot