$ git clone -n https://src.fedoraproject.org/rpms/octave-mcxlab.git /var/lib/mock/f40-build-1938618-25157/root/chroot_tmpdir/scmroot/octave-mcxlab
Cloning into '/var/lib/mock/f40-build-1938618-25157/root/chroot_tmpdir/scmroot/octave-mcxlab'...
$ git fetch origin c5b89f73778daae8fd719c4cd01b6d5e74991839:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/octave-mcxlab
 * [new ref]         c5b89f73778daae8fd719c4cd01b6d5e74991839 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5b89f7 feat: upload sources