$ git clone -n https://github.com/xcp-ng-rpms/python.git /var/lib/mock/v8.3-u-pcoval2-10396-28958/root/chroot_tmpdir/scmroot/python
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10396-28958/root/chroot_tmpdir/scmroot/python'...
$ git fetch origin c72d333830609340133786003ae80ff340c71371:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/python
 * [new ref]         c72d333830609340133786003ae80ff340c71371 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c72d333 bump release for test build