$ git clone -n https://github.com/xcp-ng-rpms/vmfs6-tools.git /var/lib/mock/v8.3-incoming-9119-27948/root/chroot_tmpdir/scmroot/vmfs6-tools
Cloning into '/var/lib/mock/v8.3-incoming-9119-27948/root/chroot_tmpdir/scmroot/vmfs6-tools'...
$ git fetch origin cf57a0609c47172674e90bf2641dfa005f4f1e72:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/vmfs6-tools
 * [new ref]         cf57a0609c47172674e90bf2641dfa005f4f1e72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf57a06 Adjust package for XCP-ng 8.3