From 622a8d725626f60ea97e8915277fdc81d46a0e89 Mon Sep 17 00:00:00 2001
From: Ding Xiang Fei <dingxiangfei2009@gmail.com>
Date: Wed, 23 May 2018 15:32:57 +0800
Subject: [PATCH] pin protoc to 3.5.1

---
 install_protobuf.sh | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/install_protobuf.sh b/install_protobuf.sh
index 5491ce8..0a1432a 100644
--- a/install_protobuf.sh
+++ b/install_protobuf.sh
@@ -1,8 +1,22 @@
 #!/usr/bin/bash
 set -e
 
-if [ ! -d "$HOME/protobuf/lib" ]; then
-    wget https://github.com/google/protobuf/archive/v3.5.1.tar.gz
-    tar -xzvf v3.5.1.tar.gz
-    cd protobuf-3.5.1 && ./autogen.sh && ./configure --prefix=$HOME/protobuf && make && make install
+check_protoc_version () {
+    version="libprotoc $1"
+    PROTOC="$HOME/protobuf/bin/protoc"
+    if [ -f $PROTOC ]; then
+        this_version=`$PROTOC --version`
+        return `[ "$version" = "$this_version" ]`
+    else
+        return 1
+    fi
+}
+
+if check_protoc_version '3.5.1'; then
+    echo protoc version 3.5.1 detected.
+    exit
 fi
+
+wget https://github.com/google/protobuf/archive/v3.5.1.tar.gz
+tar -xzvf v3.5.1.tar.gz
+cd protobuf-3.5.1 && ./autogen.sh && ./configure --prefix=$HOME/protobuf && make && make install