$ git clone -n https://github.com/xcp-ng-rpms/openssh /var/lib/mock/v8.3-incoming-10635-29187/root/chroot_tmpdir/scmroot/openssh
Cloning into '/var/lib/mock/v8.3-incoming-10635-29187/root/chroot_tmpdir/scmroot/openssh'...
$ git fetch origin 6c766438fd6b47c0aa1597d05afbe3021407fe50:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/openssh
 * [new ref]         6c766438fd6b47c0aa1597d05afbe3021407fe50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c76643 Merge pull request #10 from xcp-ng-rpms/pcoval/review/master