$ git clone -n https://github.com/xcp-ng-rpms/nbd /var/lib/mock/v8.3-incoming-10967-29394/root/chroot_tmpdir/scmroot/nbd
Cloning into '/var/lib/mock/v8.3-incoming-10967-29394/root/chroot_tmpdir/scmroot/nbd'...
$ git fetch origin 82e4c241697f6b351e17f8879d070bd67972daa2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/nbd
 * [new ref]         82e4c241697f6b351e17f8879d070bd67972daa2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82e4c24 Merge branch 'XS-8.3' into XCPNG-2698/master