$ git clone -n https://github.com/xcp-ng-rpms/ldns.git /var/lib/mock/v8.3-u-pcoval1-9967-28640/root/chroot_tmpdir/scmroot/ldns
Cloning into '/var/lib/mock/v8.3-u-pcoval1-9967-28640/root/chroot_tmpdir/scmroot/ldns'...
$ git fetch origin 5457bb4110f28c9d42b46eac5b60794110a56b64:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ldns
 * [new ref]         5457bb4110f28c9d42b46eac5b60794110a56b64 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5457bb4 bump release for test build