$ git clone -n https://src.fedoraproject.org/rpms/cbmc.git /var/lib/mock/f40-build-793185-138800/root/chroot_tmpdir/scmroot/cbmc
Cloning into '/var/lib/mock/f40-build-793185-138800/root/chroot_tmpdir/scmroot/cbmc'...
$ git fetch origin 54983a8e24f9ff20ea7a6a2022c6154b431228ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cbmc
 * [new ref]         54983a8e24f9ff20ea7a6a2022c6154b431228ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54983a8 fix FTBFS on Rawhide