在后端生产环境中,为了方便定位问题,我们需要根据一个binary文件获取其对应的git信息,包括编译出该binary所用的代码分支、commitid、时间戳、commit message等。但是随着代码版本的升级,这些git信息也会随之变化。有没有办法在每次编译binary的时候,将git信息动态注入到其中呢?答案是有!
7 F0 D9 R/ Y& ]* z; u 创建以下几个文件,创建头文件version.hh,内容如下,其中声明了表示git信息的数据结构:
& f* t# N+ P* a& t9 X#pragma once
#include <string>
namespace my_app
{
struct Version
{
static const std::string GIT_SHA1;
static const std::string GIT_BRANCH;
static const std::string GIT_DATE;
static const std::string GIT_COMMIT_SUBJECT;
};
} 创建模板文件,version.cc.in,其中定义了Version中静态变量的值。其中@XX@表示该变量通过cmake注入:
5 r) t$ W+ t8 G#include "version.hh"
5 p0 o) o; N& t' S#include "version.hh"
using namespace my_app;
const std::string Version::GIT_SHA1 = "@GIT_SHA1@";
const std::string Version::GIT_BRANCH = "@GIT_BRANCH@";
const std::string Version::GIT_DATE = "@GIT_DATE@";
const std::string Version::GIT_COMMIT_SUBJECT = "@GIT_COMMIT_SUBJECT@"; 创建main.cc3 }6 h U, j6 _, ^# w8 R1 H5 o
#include <iostream>
#include "version.hh"
using namespace my_app;
int main() {
std::cout << "building sha1: " << Version::GIT_SHA1 << std::endl;
std::cout << "building branch: " << Version::GIT_BRANCH << std::endl;
std::cout << "building date: " << Version::GIT_DATE << std::endl;
std::cout << "building commit subject: " << Version::GIT_COMMIT_SUBJECT << std::endl;
return 0; 创建CMakeLists.txt. Q+ |, ?' T% L: I: M, z8 c
cmake_minimum_required(VERSION 3.5)
project (inject_git)
set(GIT_EXECUTABLE /usr/bin/git)
# 执行git rev-parse HEAD, 生成commitid, 将结果保存于变量GIT_SHA1
execute_process(COMMAND
"${GIT_EXECUTABLE}" rev-parse HEAD
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE GIT_SHA1
ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
# 执行git rev-parse --abbrev-ref HEAD, 生成branch name, 将结果保存于变量GIT_BRANCH
execute_process(COMMAND
"${GIT_EXECUTABLE}" rev-parse --abbrev-ref HEAD
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE GIT_BRANCH
ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
# 执行git log -1 --format=%ad --date=local, 生成提交日期, 将结果保存于变量GIT_DATE
execute_process(COMMAND
"${GIT_EXECUTABLE}" log -1 --format=%ad --date=local
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE GIT_DATE
ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
# 执行git log -1 --format=%s, 生成提交日志, 将结果保存于变量GIT_COMMIT_SUBJECT
execute_process(COMMAND
"${GIT_EXECUTABLE}" log -1 --format=%s
WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
OUTPUT_VARIABLE GIT_COMMIT_SUBJECT
ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
# 上述变量初始化后,将其注入到模板文件version.cc.in中,生成version.cc
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/version.cc.in" "${CMAKE_CURRENT_BINARY_DIR}/version.cc" @ONLY)
set(SOURCES
main.cc
version.cc
)
# 由version.cc和main.cc生成二进制
add_executable(inject_git ${SOURCES}) 二进制文件执行结果如下:1 D% c# O( H, A4 [# I' g
$ ./inject_git + ~$ T+ v$ f" j" u0 {+ Z
building sha1: 74b25fc30d18001f72ec0cf0495165441df40a09
9 m. X/ [% x3 G! Ebuilding branch: master
1 m1 A* P3 A6 ?3 h* ebuilding date: Fri May 28 14:49:16 2021
8 t7 s; D, g' }4 E* r0 obuilding commit subject: add again |