$ git clone -n https://github.com/xcp-ng-rpms/openssh.git /var/lib/mock/v8.3-incoming-8929-27873/root/chroot_tmpdir/scmroot/openssh
Cloning into '/var/lib/mock/v8.3-incoming-8929-27873/root/chroot_tmpdir/scmroot/openssh'...
$ git fetch origin b22bda91387254b34c7f58379f5ca7b25eb3e632:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/openssh
 * [new ref]         b22bda91387254b34c7f58379f5ca7b25eb3e632 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b22bda9 Security: Disable chacha20 algorithm, reintroduce curves, ciphers