$ git clone -n https://src.fedoraproject.org/rpms/kf5-knewstuff.git /var/lib/mock/f40-build-2292641-56149/root/chroot_tmpdir/scmroot/kf5-knewstuff
Cloning into '/var/lib/mock/f40-build-2292641-56149/root/chroot_tmpdir/scmroot/kf5-knewstuff'...
$ git fetch origin 74285ce75d42de62e1cf1b1ec29831769021025d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-knewstuff
 * [new ref]         74285ce75d42de62e1cf1b1ec29831769021025d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74285ce Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild