$ git clone -n https://github.com/xcp-ng-rpms/openssh.git /var/lib/mock/v8.3-u-pcoval2-10386-28948/root/chroot_tmpdir/scmroot/openssh
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10386-28948/root/chroot_tmpdir/scmroot/openssh'...
$ git fetch origin b4d70a505ca6951105a12e250485c73ad450b390:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/openssh
 * [new ref]         b4d70a505ca6951105a12e250485c73ad450b390 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4d70a5 bump release for test build