$ git clone -n https://src.fedoraproject.org/rpms/krfb.git /var/lib/mock/f39-build-1663810-40694/root/chroot_tmpdir/scmroot/krfb
Cloning into '/var/lib/mock/f39-build-1663810-40694/root/chroot_tmpdir/scmroot/krfb'...
$ git fetch origin 30c79ee52bc6a1999b2a2252325291702dcc9820:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/krfb
 * [new ref]         30c79ee52bc6a1999b2a2252325291702dcc9820 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 30c79ee 23.08.2