$ git clone -n https://src.fedoraproject.org/rpms/cfdg-fe.git /var/lib/mock/f40-build-791253-137272/root/chroot_tmpdir/scmroot/cfdg-fe
Cloning into '/var/lib/mock/f40-build-791253-137272/root/chroot_tmpdir/scmroot/cfdg-fe'...
$ git fetch origin 6c6c04140c750e4183c10d57cdbfea1cc23b6e2d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cfdg-fe
 * [new ref]         6c6c04140c750e4183c10d57cdbfea1cc23b6e2d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c6c041 Patch for FTBFS