$ git clone -n https://github.com/xcp-ng-rpms/rsync.git /var/lib/mock/v8.3-u-pcoval2-9913-28614/root/chroot_tmpdir/scmroot/rsync
Cloning into '/var/lib/mock/v8.3-u-pcoval2-9913-28614/root/chroot_tmpdir/scmroot/rsync'...
$ git fetch origin e342a6d31203ffdd31199afedc4634d9d11960cd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/rsync
 * [new ref]         e342a6d31203ffdd31199afedc4634d9d11960cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e342a6d bump release for test build