$ git clone -n https://src.fedoraproject.org/rpms/mirrormagic.git /var/lib/mock/f40-build-2613314-64061/root/chroot_tmpdir/scmroot/mirrormagic
Cloning into '/var/lib/mock/f40-build-2613314-64061/root/chroot_tmpdir/scmroot/mirrormagic'...
$ git fetch origin 29d827b2fd4bc37507c48fc5a0b140e0499b149e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mirrormagic
 * [new ref]         29d827b2fd4bc37507c48fc5a0b140e0499b149e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29d827b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild