$ git clone -n https://src.fedoraproject.org/rpms/kblocks.git /var/lib/mock/f40-build-2237198-53533/root/chroot_tmpdir/scmroot/kblocks
Cloning into '/var/lib/mock/f40-build-2237198-53533/root/chroot_tmpdir/scmroot/kblocks'...
$ git fetch origin f753540b80eb8d10048314ed582d56b8c7b5be44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kblocks
 * [new ref]         f753540b80eb8d10048314ed582d56b8c7b5be44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f753540 24.01.90