$ git clone -n https://src.fedoraproject.org/rpms/vkroots.git /var/lib/mock/f40-build-798024-141648/root/chroot_tmpdir/scmroot/vkroots
Cloning into '/var/lib/mock/f40-build-798024-141648/root/chroot_tmpdir/scmroot/vkroots'...
$ git fetch origin 616086b21d11b3de195fc9e4dc607cb79ce2f025:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vkroots
 * [new ref]         616086b21d11b3de195fc9e4dc607cb79ce2f025 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 616086b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild