linux下protobuf 下载并cmake编译安装全过程脚本

#!/bin/bash

shell_folder=$(cd "$(dirname "$0")";pwd)
pushd $shell_folder
#如果指定的文件/文件夹存在则删除，删除失败则中止脚本
remove_if_exist(){
    if [ $# -eq 1 ]
    then
        if [ -e $1 ]
        then
            rm $1 -fr
            if [ ! $? -eq 0 ]
            then
                exit -1
            fi
        fi
        return 0
    else 
        echo invalid argument:
        echo $*
        exit -1
    fi
}
exit_on_error(){
  if [ ! $? -eq 0 ]
  then
    exit -1
  fi
}
# 如果文件存在且checksum与$2指定的md5相等则返回 1,否则返回0
# $1 待检查的文件路径
# $2 md5校验码
need_download(){
  if [ $# -eq 2 ]
    then
      if [ -f $1 ]; then
        echo "File already exists. Checking md5..."
        os=`uname -s`
        if [ "$os" = "Linux" ]; then
          checksum=`md5sum $1 | awk '{ print $1 }'`
        elif [ "$os" = "Darwin" ]; then
          checksum=`cat $1 | md5`
        fi
        if [ "$checksum" = "$2" ]; then
          echo "Checksum is correct. No need to download $1."
          return 1
        else
          echo "Checksum is incorrect. Need to download again $1"                
        fi
    else
      return 0
    fi
  else 
    echo invalid argument:
    echo $*
    exit -1
  fi
}
# 从github上下载源码,如果本地不存在指定的zip包，或md5校验码不匹配则从github下载
# $1 项目名称
# $2 版本号
# $3 zip文件的md5
# $4 项目所有者名称
# $5 zip包文件名前缀
download_from_github(){
  if [ $# -eq 5 ]
  then
    project_folder="$1-$2"
    project_package="$project_folder.zip"
    if need_download $project_package $3
    then
      echo "(下载源码)downloading $1 $2 source"
      wget --no-check-certificate https://github.com/$4/$1/archive/$5$2.zip -O $project_package
      exit_on_error
    fi
    remove_if_exist $project_folder
    unzip $project_package
    exit_on_error
  else
    echo invalid argument:
    echo $*
    exit -1
  fi
}

download_from_github "protobuf" "3.3.1" "9377e414994fa6165ecb58a41cca3b40" "google" "v"

popd

#!/bin/bash
GXX_PATH="-DCMAKE_BUILD_TYPE:STRING=RELEASE"
INSTALL_FOLDER=$(dirname $(readlink -f $0))/release/protobuf_linux_x86_64
pushd protobuf-3.3.1
echo INSTALL_FOLDER:$INSTALL_FOLDER
if [ -d build.gcc ]
then 
    rm -fr build.gcc/*
else 
    mkdir build.gcc
fi
pushd build.gcc
cmake ../cmake $GXX_PATH -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALL_FOLDER  -Dprotobuf_BUILD_TESTS=off
# 编译并安装protobuf到指定的文件夹
make install
popd
rm -fr build.gcc
popd