$ git clone -n https://src.fedoraproject.org/rpms/fragments.git /var/lib/mock/f38-build-side-42-init-devel-978708-28986/root/chroot_tmpdir/scmroot/fragments
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-978708-28986/root/chroot_tmpdir/scmroot/fragments'...
$ git fetch origin e6607d7a535f339cc270de503ffb75af2a40ea9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fragments
 * [new ref]         e6607d7a535f339cc270de503ffb75af2a40ea9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6607d7 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild