如何在 Go 中使用 os/exec 以不同使用者身分執行外部命令？

import (
    "fmt"
    "os/exec"
    "syscall"
    "strconv"
    "user"
)

func RunExternalCommandAsUser(username, command string, args ...string) error {
    // Lookup the user by name
    u, err := user.Lookup(username)
    if err != nil {
        return fmt.Errorf("failed to lookup user %s: %v", username, err)
    }

    // Convert the UID to an integer
    uid, err := strconv.Atoi(u.Uid)
    if err != nil {
        return fmt.Errorf("failed to convert UID to integer: %v", err)
    }

    // Create a new command object
    cmd := exec.Command(command, args...)

    // Set the SysProcAttr field with the Credential struct
    cmd.SysProcAttr = &syscall.SysProcAttr{
        Credential: &syscall.Credential{Uid: uid, Gid: -1}, // -1 indicates to keep the current group
    }

    // Execute the command
    err = cmd.Run()
    if err != nil {
        return fmt.Errorf("failed to execute command: %v", err)
    }

    return nil
}