$ git clone -n https://github.com/xcp-ng-rpms/xcp-python-libs.git /var/lib/mock/v8.3-u-prebuild-9334-28088/root/chroot_tmpdir/scmroot/xcp-python-libs
Cloning into '/var/lib/mock/v8.3-u-prebuild-9334-28088/root/chroot_tmpdir/scmroot/xcp-python-libs'...
$ git fetch origin ef676803e87b69f7e38e30cf6bf1b823b8841480:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-python-libs
 * [new ref]         ef676803e87b69f7e38e30cf6bf1b823b8841480 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef67680 bump release for test build