$ git clone -n https://src.fedoraproject.org/rpms/derrick.git /var/lib/mock/f40-build-1166922-21657/root/chroot_tmpdir/scmroot/derrick
Cloning into '/var/lib/mock/f40-build-1166922-21657/root/chroot_tmpdir/scmroot/derrick'...
$ git fetch origin 6eeaa0092d1bd5c4a04cd7a17d9c4e9c35f9bf30:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/derrick
 * [new ref]         6eeaa0092d1bd5c4a04cd7a17d9c4e9c35f9bf30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6eeaa00 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild