[linux]跨发行版运行二进制

需求点：客户不接受docker部署，服务编译环境无法和客户环境对齐，需要找到办法兼容

方案：mock整套ld/so，不依赖客户环境的基础组件

 

 

1. 正常编译，编译后拷贝整套so

#!/bin/bash
ABS_PATH=`pwd`
echo "start copy system runtime libs, right path: ${ABS_PATH}"

ldd_output=$(ldd ../exec)

echo "$ldd_output" | while read -r line; do
  fields=($(echo "$line" | awk '{print $NF, $(NF-1)}'))
  if [ "${#fields[@]}" -eq 2 ] && [ -e "${fields[1]}" ] && [[ "${fields[1]}" != "/rtc_transcode"* ]] ; then
    echo "cp valid so: [${fields[1]}] to [output/lib]"
    cp ${fields[1]} ../output/lib
  fi
done

cp ../local_record_deps/patchelf ../output/bin/

chmod 777 ../output/lib/*

 

2. 发行版 patchelf 作为辅助产物打包，运行前更改ld为编译环境的ld

/output/bin/patchelf --set-interpreter /output/lib/ld-linux-x86-64.so.2 /output/bin/toutiao.videoarch.rtc_transcode

更改前
root@n37-009-198:/data00/build# readelf -aW a.out | grep -iE "interpreter"
      [Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]

更改后 
[root@c211b21fb421 bin]# readelf -aW ./exec | grep -iE "interpreter"
      [Requesting program interpreter: /output/lib/ld-linux-x86-64.so.2]

 

3. 优化

仅首次运行需要调整