$ git clone -n https://src.fedoraproject.org/rpms/krfb.git /var/lib/mock/f40-build-1919853-25097/root/chroot_tmpdir/scmroot/krfb
Cloning into '/var/lib/mock/f40-build-1919853-25097/root/chroot_tmpdir/scmroot/krfb'...
$ git fetch origin a134cf7ac019862adcef710318fdad4206b5822e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/krfb
 * [new ref]         a134cf7ac019862adcef710318fdad4206b5822e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a134cf7 Merge branch 'rawhide' into f40