$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v8.3-u-pcoval1-9730-28440/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-u-pcoval1-9730-28440/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin b0c429d8c753d32da01ba33594b1091bfeb8cb4d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         b0c429d8c753d32da01ba33594b1091bfeb8cb4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0c429d bump release for test build