$ git clone -n https://github.com/xcp-ng-rpms/python.git /var/lib/mock/v8.3-u-pcoval2-10027-28674/root/chroot_tmpdir/scmroot/python
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10027-28674/root/chroot_tmpdir/scmroot/python'...
$ git fetch origin cdaf45d90786604bab8cdd842b086a4c5b8542c7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/python
 * [new ref]         cdaf45d90786604bab8cdd842b086a4c5b8542c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdaf45d bump release for test build