$ git clone -n https://github.com/xcp-ng-rpms/iputils /var/lib/mock/v8.3-incoming-10660-29212/root/chroot_tmpdir/scmroot/iputils
Cloning into '/var/lib/mock/v8.3-incoming-10660-29212/root/chroot_tmpdir/scmroot/iputils'...
$ git fetch origin 9265ffac7103b12cfd7a98ae7f2a47c8436e9cdd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/iputils
 * [new ref]         9265ffac7103b12cfd7a98ae7f2a47c8436e9cdd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9265ffa Merge pull request #1 from xcp-ng-rpms/8.3-XS-1557