http://jackxiang.com/index.php zh-cn http://jackxiang.com/post// jack <xdy108@126.com> Sun, 01 Oct 2017 13:57:25 +0000 http://jackxiang.com/post//
一、搞这玩意儿的原因：
root情况：
git config -l user.name=Administrator user.email=admin@example.com
xiangdong:
git config -l user.name=xiangdong user.email=xiangdong@justwinit.cn core.autocrlf=input
解决一个无论是root还是xiangdong的环境下，只需要执行下面我们搞的这个c语言生成的二进制文件就能一直只以向东的用户进行提交git，看起来扯淡，但还是有点用的，敲啥呢： gitpush ，和git push只是没有那个空格了。经实践证明是可行的，如下：


二、生产这个玩意的过程：
源码及Makefile和生成的二进制文件路径：
#tree -L 2 ../../gitpush/ ../../gitpush/ ├── bin │   └── gitpush └── src     ├── gitpush.c     └── Makefile

Makefile文件内容：
cat Makefile
gitpush:gitpush.c         gcc -g -o  gitpush -Wall gitpush.c         mv gitpush ../bin         chmod a+x ../bin/gitpush         cp -rf /usr/local/gitpush/src/gitpush.sh /etc/profile.d/gitpush.sh clean:         rm -rf gitpush             rm -rf /etc/profile.d/gitpush.sh
源代码：cat gitpush.c
#include <stdio.h>                                                                         #include <string.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> #include <stdarg.h> #include <sys/types.h> #include <pwd.h> int main() {         char curpath[80];         char forbidname[]="root";         char whoami[80];         char command[36000];         FILE *pPipe;         char psBuffer[36000];         struct passwd *pwd;         pwd = getpwuid(getuid());         //printf("当前登陆的用户名为：%s\n", pwd->pw_name);         strcpy(whoami,pwd->pw_name);         getcwd(curpath, sizeof(curpath));         //printf("current working directory : %s\n", curpath);         //printf("The UID is %d \n", getuid());         //strcpy(whoami,getlogin()); #要是先xiangdong登录，再sudo su -成root，值还是向东。         //printf("The login name is %s\n", getlogin());         //printf("The forbidlogin name is %s\n", forbidname);         if(0 == strcmp(forbidname,whoami)){//root，得提示一下换角色再Push                 printf("提醒：请小心，现在正在Root环境下面，立即切换到xiangdong用户并作提交。\n");                 snprintf(command,sizeof(command),"/usr/bin/sudo -i -u xiangdong -H cd %s && git push",curpath);         }else{             snprintf(command,sizeof(command),"cd %s && git push",curpath);         }         printf("执行:%s\n",command);         if( (pPipe = popen( command, "r" )) == NULL ){//执行脚本             printf("Excute Command Faild :%s",command);             exit( 1 );         }         while(!feof(pPipe))/* Read pipe until end of file. */         {             if(fgets(psBuffer, sizeof(psBuffer), pPipe) != NULL)             printf("%s",psBuffer);         }         pclose(pPipe);         return 1; }


最后，PATH路径：
cat /etc/profile.d/gitpush.sh
export PATH=$PATH:/usr/local/gitpush/bin

三、验证步骤阶段：
root下执行情况：
#gitpush
#gitpush
当前登陆的用户名为：root
current working directory : /home/xiangdong/shell
The UID is 0
The login name is xiangdong
The forbidlogin name is root
请小心，你现在正在Root环境下面，不过没关系，我给你切换到xiangdong用户并作提交。执行git push命令：/usr/bin/sudo -i -u xiangdong -H cd /home/xiangdong/shell && git push
Counting objects: 4, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 288 bytes, done.
Total 3 (delta 1), reused 1 (delta 0)
To git@gitlab.qr.justwinit.net:levooops/shell.git
   bd83c51..b400811  master -> master

xiangdong下面执行情况：
$gitpush
执行:cd /home/xiangdong/shell && git push
Counting objects: 5, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 277 bytes, done.
Total 3 (delta 1), reused 0 (delta 0)
To git@gitlab.qr.justwinit.net:levooops/shell.git
   b400811..0b19550  master -> master

成功Log:
$git log
commit 0b195507efa6278774d4f500a7086003d6744684
Author: xiangdong <xiangdong@justwinit.cn>
Date:   Sun Oct 1 23:15:32 2017 +0800

    加上README.md

commit b40081190bf020d49375a4117a181f00ea0a2503
Author: xiangdong <xiangdong@justwinit.cn>
Date:   Sun Oct 1 23:09:58 2017 +0800

    加上README.md

================================================================================
附录：
为什么 sudo cd 会报错 command not found:
https://www.starduster.me/2015/09/12/why-command-not-found-when-sudo-cd/

相关函数：get_current_dir_name, getwd, chdir
头文件：#include <unistd.h>
定义函数：char * getcwd(char * buf, size_t size);
函数说明：getcwd()会将当前的工作目录绝对路径复制到参数buf 所指的内存空间，参数size 为buf 的空间大小。
注：
1、在调用此函数时，buf 所指的内存空间要足够大。若工作目录绝对路径的字符串长度超过参数size 大小，则返回NULL，errno 的值则为ERANGE。
2、倘若参数buf 为NULL，getcwd()会依参数size 的大小自动配置内存(使用malloc())，如果参数size 也为0，则getcwd()会依工作目录绝对路径的字符串程度来决定所配置的内存大小，进程可以在使用完次字符串后利用free()来释放此空间。

返回值：执行成功则将结果复制到参数buf 所指的内存空间, 或是返回自动配置的字符串指针. 失败返回NULL,错误代码存于errno.

范例
#include <unistd.h> main() {     char buf[80];     getcwd(buf, sizeof(buf));     printf("current working directory : %s\n", buf); }

执行：
current working directory :/tmp

cat test_processname.cpp
#include <limits.h> #include <stdio.h> #include <string.h> #include <unistd.h> size_t get_executable_path( char* processdir,char* processname, size_t len) {         char* path_end;         if(readlink("/proc/self/exe", processdir,len) <=0)                 return -1;         path_end = strrchr(processdir,  '/');         if(path_end == NULL)                 return -1;         ++path_end;         strcpy(processname, path_end);         *path_end = '\0';         return (size_t)(path_end - processdir); } int main() {         char path[PATH_MAX];         char processname[1024];         get_executable_path(path, processname, sizeof(path));         printf("directory:%s\nprocessname:%s\n",path,processname);         char buf[80];         getcwd(buf, sizeof(buf));         printf("current working directory : %s\n", buf);         printf("The UID is %d \n", getuid());         printf("The login name is %s\n", getlogin()); }


g++ test_processname.cpp -o gitpush
mv /tmp/gp /usr/local/gitpush/gitpush

cat /etc/profile.d/gp.sh
export PATH=$PATH:/usr/local/gitpush

#gp
directory:/usr/local/gitpush/
processname:gp
current working directory : /root


./gitpush
directory:/tmp/
processname:gitpush
current working directory : /tmp
The UID is 0
The login name is xiangdong ]]> http://jackxiang.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 http://jackxiang.com/post//#blogcomment