$ git clone -n https://src.fedoraproject.org/rpms/veccore.git /var/lib/mock/f40-build-2647423-66701/root/chroot_tmpdir/scmroot/veccore
Cloning into '/var/lib/mock/f40-build-2647423-66701/root/chroot_tmpdir/scmroot/veccore'...
$ git fetch origin cf3400faaa23bd5688e0ce9d32c4d4a9cc1e4a2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/veccore
 * [new ref]         cf3400faaa23bd5688e0ce9d32c4d4a9cc1e4a2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf3400f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild