$ git clone -n https://src.fedoraproject.org/rpms/frozen.git /var/lib/mock/f40-build-2438023-60873/root/chroot_tmpdir/scmroot/frozen
Cloning into '/var/lib/mock/f40-build-2438023-60873/root/chroot_tmpdir/scmroot/frozen'...
$ git fetch origin 5cb5f70adb72b751d8be6aa0ebe8381887b31b36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/frozen
 * [new ref]         5cb5f70adb72b751d8be6aa0ebe8381887b31b36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cb5f70 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild