$ git clone -n https://github.com/xcp-ng-rpms/stunnel.git /var/lib/mock/v8.3-incoming-10144-28716/root/chroot_tmpdir/scmroot/stunnel
Cloning into '/var/lib/mock/v8.3-incoming-10144-28716/root/chroot_tmpdir/scmroot/stunnel'...
$ git fetch origin cc18d928ef45a13d2bebd045b08f098cbd658a54:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/stunnel
 * [new ref]         cc18d928ef45a13d2bebd045b08f098cbd658a54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc18d92 Import stunnel-5.60-5.xs8.src.rpm