$ git clone -n https://github.com/xcp-ng-rpms/xcp-featured.git /var/lib/mock/v8.3-incoming-9789-28504/root/chroot_tmpdir/scmroot/xcp-featured
Cloning into '/var/lib/mock/v8.3-incoming-9789-28504/root/chroot_tmpdir/scmroot/xcp-featured'...
$ git fetch origin 76353ba458f8a3ce12dd7e934defb105636b669e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-featured
 * [new ref]         76353ba458f8a3ce12dd7e934defb105636b669e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76353ba Rebuild for xapi-25.33.1-2.1.xcpng8.3 (#9)