Add vagrant init guide script

dev.md

@@ -9,7 +9,13 @@
 1. The `vagrant up` command starts the VM and runs `provision.sh` as user `root`.  The `provision.sh` installs Docker and minikube and pulls related Docker images.  It also generates a `start.sh`.  Users should run `vagrant ssh` and execute `start.sh` inside the VM as user `vagrant`.  The `start.sh` starts minikube, deploys Argo/Tekton, and run all the services in the VM.
 1. Every time we edit the `provison.sh`, we can run `vagrant provision` to rerun `provision.sh` as root.  This rerun would see the previously installed software.  So `provision.sh` contains some `if..else` structures to skip reinstalling software.
 1. To suspend the VM, run `vagrant halt`.  You can run `vagrant up` later to resume it.
-1. To completely destroy the VM and re-provision it, run `vagrant reload`.
+1. To completely destroy the VM and re-provision it, run `vagrant destroy` and `vagrant up`.
+
+We have provided an install shell script for you to get an easy initialization.  You can run it with:
+```bash
+./install.sh [inchina]
+```
+It will guide you to setup the vagrant environment.  Especially, for developers in China, you may add the `inchina` param to download the ubuntu box for vagrant beforehand.  After the initialization, you will have a virtual machine named `playground_default...` in VirtualBox which is already provisioned.  You may follow the direction of the output to get things done.
 
 ### For Releaser
 
@@ -41,5 +47,5 @@ Or, if s/he has an AWS or Google Cloud account, s/he could upload the `.ova` fil
 Anyway, given a running VM, the end-user can run the following command to connect to it:
 
 ```bash
-sqlflow -server=my-vm.aws.com:3306
+sqlflow --sqlflow_server=my-vm.aws.com:50051
 ```

install.bash

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# Copyright 2020 The SQLFlow Authors. All rights reserved.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+
+if [[ "$1" == "inchina" ]]; then
+  export WE_ARE_IN_CHINA=true
+fi
+
+echo
+echo "Welcome to SQLFlow playground!"
+echo
+
+if ! which vagrant >/dev/null; then
+  echo "Install vagrant first, please refer to https://www.vagrantup.com/downloads.html"
+  echo
+  echo "If you are using macOS, the operation system may prevent you from installing the web-downloaded package, you can try use brew to install vagrant. like:"
+  echo "brew cask install vagrant"
+  echo
+  echo "Fix this and re-run this script again please!"
+  exit 0
+fi
+
+if [[ -n "$(vagrant global-status --prune | grep -o 'playground')" ]]; then
+  echo "It seems you have already installed our playground, exiting..."
+  exit 0
+fi
+
+if [[ "$WE_ARE_IN_CHINA" ]]; then
+  if [[ -z "$(vagrant box list | grep -o ubuntu/bionic64)" ]]; then
+    echo "Download ubuntu box beforehand..."
+    mkdir -p downloads
+    # try with https://mirrors.ustc.edu.cn/ if below not work
+    wget -c -nv --show-progress -O downloads/ubuntu-bionic64.box "https://mirrors.ustc.edu.cn/ubuntu-cloud-images/bionic/current/bionic-server-cloudimg-amd64-vagrant.box"
+    vagrant box add ubuntu/bionic64 downloads/ubuntu-bionic64.box
+  fi
+fi
+
+echo "Start and provision the playgound now..."
+vagrant up
+