$ git clone -n https://github.com/xcp-ng-rpms/nut.git /var/lib/mock/v8.3-incoming-11312-29644/root/chroot_tmpdir/scmroot/nut
Cloning into '/var/lib/mock/v8.3-incoming-11312-29644/root/chroot_tmpdir/scmroot/nut'...
$ git fetch origin 62d626e0464e66e111541bbb1a7b62d760b0aee5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/nut
 * [new ref]         62d626e0464e66e111541bbb1a7b62d760b0aee5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62d626e Merge pull request #1 from xcp-ng-rpms/XCPNG-3059/8.3