$ git clone -n https://github.com/xcp-ng-rpms/ssmtp.git /var/lib/mock/v8.3-incoming-10057-28689/root/chroot_tmpdir/scmroot/ssmtp
Cloning into '/var/lib/mock/v8.3-incoming-10057-28689/root/chroot_tmpdir/scmroot/ssmtp'...
$ git fetch origin ea45dd6b375fde517420ddf4fa92dee36e9bd82d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ssmtp
 * [new ref]         ea45dd6b375fde517420ddf4fa92dee36e9bd82d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea45dd6 Update obsolete patch macro with autosetup