$ git clone -n https://src.fedoraproject.org/rpms/cogl.git /var/lib/mock/f42-build-side-1-3533141-46342/root/chroot_tmpdir/scmroot/cogl
Cloning into '/var/lib/mock/f42-build-side-1-3533141-46342/root/chroot_tmpdir/scmroot/cogl'...
$ git fetch origin b716258eef9a2d11d24fc8f98bfc0390968c7466:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cogl
 * [new ref]         b716258eef9a2d11d24fc8f98bfc0390968c7466 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b716258 Fix documentation for tests subpackage