$ git clone -n https://github.com/xcp-ng-rpms/stunnel.git /var/lib/mock/v8.3-u-pcoval2-10437-28997/root/chroot_tmpdir/scmroot/stunnel
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10437-28997/root/chroot_tmpdir/scmroot/stunnel'...
$ git fetch origin b68b7210ed169ce6a38a206bcc42d14f94a18ba5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/stunnel
 * [new ref]         b68b7210ed169ce6a38a206bcc42d14f94a18ba5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b68b721 bump release for test build