$ git clone -n https://github.com/xcp-ng-rpms/bind /var/lib/mock/v8.3-incoming-10653-29207/root/chroot_tmpdir/scmroot/bind
Cloning into '/var/lib/mock/v8.3-incoming-10653-29207/root/chroot_tmpdir/scmroot/bind'...
$ git fetch origin 742a17e301d5ac665fbf8a0ffae5f11c399c3ef5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/bind
 * [new ref]         742a17e301d5ac665fbf8a0ffae5f11c399c3ef5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 742a17e Merge pull request #1 from xcp-ng-rpms/8.3-XS-1557