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exec.go
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exec.go
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package container
import (
"encoding/json"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"xwj/mydocker/log"
)
const (
ENV_EXEC_PID = "mydocker_pid"
ENV_EXEC_CMD = "mydocker_cmd"
)
// ExecContainer
// @Description: 创建子命令运行exec
// @param containerID
// @param commandAry
func ExecContainer(containerID string, commandAry []string) {
pid, err := getContainerPidByID(containerID)
if err != nil {
return
}
cmdStr := strings.Join(commandAry, " ")
log.Log.Infof("container pid %s", pid)
log.Log.Infof("command %s", cmdStr)
cmd := exec.Command("/proc/self/exe", "exec")
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
// 设置环境变量:进程号与执行命令
if err := os.Setenv(ENV_EXEC_PID, pid); err != nil {
log.LogErrorFrom("ExecContainer", "Setenv_ENV_EXEC_PID", err)
return
}
if err := os.Setenv(ENV_EXEC_CMD, cmdStr); err != nil {
log.LogErrorFrom("ExecContainer", "Setenv_ENV_EXEC_CMD", err)
return
}
if err := cmd.Run(); err != nil {
log.LogErrorFrom("ExecContainer", "Run", err)
return
}
}
// getContainerPidByID
// @Description: 根据容器ID获取其PID
// @param containerID
// @return string
// @return error
func getContainerPidByID(containerID string) (string, error) {
// 读取容器信息文件
containerInfoPath := filepath.Join(DefaultInfoLocation, containerID, ConfigName)
content, err := ioutil.ReadFile(containerInfoPath)
if err != nil {
log.LogErrorFrom("getContainerPidByID", "ReadFile", err)
return "", err
}
var containerInfo ContainerInfo
if err := json.Unmarshal(content, &containerInfo); err != nil {
log.LogErrorFrom("getContainerPidByID", "Unmarshal", err)
return "", err
}
return containerInfo.Pid, nil
}