$ git clone -n https://github.com/xcp-ng-rpms/ldns.git /var/lib/mock/v8.3-incoming-10628-29182/root/chroot_tmpdir/scmroot/ldns
Cloning into '/var/lib/mock/v8.3-incoming-10628-29182/root/chroot_tmpdir/scmroot/ldns'...
$ git fetch origin 6dca54feea52b25dc483782ed2a1bae1811abad2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ldns
 * [new ref]         6dca54feea52b25dc483782ed2a1bae1811abad2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6dca54f Merge pull request #2 from xcp-ng-rpms/pcoval/review/master