$ git clone -n https://github.com/xcp-ng-rpms/ldns.git /var/lib/mock/v8.3-u-pcoval2-10551-29106/root/chroot_tmpdir/scmroot/ldns
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10551-29106/root/chroot_tmpdir/scmroot/ldns'...
$ git fetch origin d4c4db46211cc552e4376fd4d341e1a76727a222:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ldns
 * [new ref]         d4c4db46211cc552e4376fd4d341e1a76727a222 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4c4db4 bump release for test build