$ git clone -n https://github.com/xcp-ng-rpms/openssh.git /var/lib/mock/v8.3-incoming-10870-29365/root/chroot_tmpdir/scmroot/openssh
Cloning into '/var/lib/mock/v8.3-incoming-10870-29365/root/chroot_tmpdir/scmroot/openssh'...
$ git fetch origin 844ec183b6a54c35529ef802a0d5ff7a4cb405e2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/openssh
 * [new ref]         844ec183b6a54c35529ef802a0d5ff7a4cb405e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 844ec18 Add related announcement