$ git clone -n https://src.fedoraproject.org/rpms/kf6-kbookmarks.git /var/lib/mock/f40-build-2357220-60307/root/chroot_tmpdir/scmroot/kf6-kbookmarks
Cloning into '/var/lib/mock/f40-build-2357220-60307/root/chroot_tmpdir/scmroot/kf6-kbookmarks'...
$ git fetch origin be5d08fc4297f26d7e4c9daf5d4468ef7ad2a64a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kbookmarks
 * [new ref]         be5d08fc4297f26d7e4c9daf5d4468ef7ad2a64a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be5d08f 5.249.0