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exec.go
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exec.go
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package main
import (
"fmt"
"github.com/sirupsen/logrus"
_ "github.com/yunfeiyang1916/cloud-docker/nsenter"
"io/ioutil"
"os"
"os/exec"
"strings"
)
const (
// EnvExecPID pid环境变量
EnvExecPID = "cloud_docker_pid"
// EnvExecCmd exec命令环境变量
EnvExecCmd = "cloud_docker_cmd"
)
func ExecContainer(containerName string, cmdArray []string) {
info, err := getContainerInfo(containerName)
if err != nil {
logrus.Errorf("ExecContainer getContainerInfoByName %s error %v", containerName, err)
return
}
// 把命令以空格为分隔符拼接成一个字符串,便于传递
cmdStr := strings.Join(cmdArray, " ")
logrus.Infof("container pid %s", info.Pid)
logrus.Infof("command %s", cmdStr)
// 克隆自己,执行exec命令
cmd := exec.Command("/proc/self/exe", "exec")
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
os.Setenv(EnvExecPID, info.Pid)
os.Setenv(EnvExecCmd, cmdStr)
envs := getEnvsByPid(info.Pid)
cmd.Env = append(os.Environ(), envs...)
if err = cmd.Run(); err != nil {
logrus.Errorf("exec container %s error %v", containerName, err)
}
}
// 获取指定进程的环境变量
func getEnvsByPid(pid string) []string {
path := fmt.Sprintf("/proc/%s/environ", pid)
buf, err := ioutil.ReadFile(path)
if err != nil {
logrus.Errorf("read file %s error %v", path, err)
return nil
}
// 多个环境变量中的分隔符是\u0000
envs := strings.Split(string(buf), "\u0000")
return envs
}