$ git clone -n https://src.fedoraproject.org/rpms/opus.git /var/lib/mock/f41-build-847454-163983/root/chroot_tmpdir/scmroot/opus
Cloning into '/var/lib/mock/f41-build-847454-163983/root/chroot_tmpdir/scmroot/opus'...
$ git fetch origin 79d83a16b6d7d81b8df066cddbd07b8cf7644a55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opus
 * [new ref]         79d83a16b6d7d81b8df066cddbd07b8cf7644a55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79d83a1 Update to 1.5.2