$ git clone -n https://src.fedoraproject.org/rpms/frozen.git /var/lib/mock/f40-build-2245273-53757/root/chroot_tmpdir/scmroot/frozen
Cloning into '/var/lib/mock/f40-build-2245273-53757/root/chroot_tmpdir/scmroot/frozen'...
$ git fetch origin 725cb8bf9314129b691c383f6e66bf353495dc1e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frozen
 * [new ref]         725cb8bf9314129b691c383f6e66bf353495dc1e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 725cb8b Fix error of find_package(frozen) in CMake