$ git clone -n https://github.com/xcp-ng-rpms/xcp-python-libs.git /var/lib/mock/v8.3-u-prebuild-9336-28088/root/chroot_tmpdir/scmroot/xcp-python-libs
Cloning into '/var/lib/mock/v8.3-u-prebuild-9336-28088/root/chroot_tmpdir/scmroot/xcp-python-libs'...
$ git fetch origin 326841e86be824a01b9d4b99962b3b48593bf5d4:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-python-libs
 * [new ref]         326841e86be824a01b9d4b99962b3b48593bf5d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 326841e bump release for test build