英文:
Executing docker command using golang exec fails
问题
我正在使用cmd.go（见下文）执行一个docker命令，但是失败了。我按照以下步骤执行并得到以下错误。
go build
sudo ./cmd
输出：
docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m
2014/10/16 14:32:12 退出状态 1
另一方面，直接运行
sudo docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m
会得到正确的输出。
Hello World
这是cmd.go的代码。我该如何使其工作？谢谢！
package main
import (
"fmt"
"log"
"os/exec"
"strings"
)
func ExampleCmd_Output() {
//out, err := exec.Command("date", "--version").Output() // 这个可以工作
//out, err := exec.Command("docker", "--version").Output() // 这个可以工作
//out, err := exec.Command(cmd, "images").Output() // 即使是docker images命令也可以工作！
cmd := "docker"
cmdArgs := []string{"run", "-v", "~/exp/a.out:/a.out", "ubuntu:14.04", "/a.out", "-m", "10m"}
fmt.Println(cmd + " " + strings.Join(cmdArgs, " "))
out, err := exec.Command(cmd, cmdArgs...).Output()
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s", out)
}
func main() {
ExampleCmd_Output()
}
编辑：根据评论，我尝试执行命令"docker images"。如果我使用sudo运行可执行文件，它可以工作。也就是说，我现在在代码中使用以下行。
out, err := exec.Command(cmd, "images").Output()
在执行go build并运行"sudo ./cmd"之后，我得到了docker images命令的输出。然而，如果没有sudo，我仍然得到退出状态1。但是，即使使用sudo，使用上面的docker run命令，我也没有得到输出。
英文:
I am using cmd.go (see below) to execute a docker command but it fails. I do the following steps to execute and get the following error.
go build
sudo ./cmd
Output:
docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m
2014/10/16 14:32:12 exit status 1
On the other hand running directly as
sudo docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m
results in the correct output of a.out.
Hello World
This is the code of cmd.go. How can I get it to work? Thanks!
package main
import (
"fmt"
"log"
"os/exec"
"strings"
)
func ExampleCmd_Output() {
//out, err := exec.Command("date", "--version").Output() // This works
//out, err := exec.Command("docker", "--version").Output() // This works
//out, err := exec.Command(cmd, "images").Output() // Even docker images command works!
cmd := "docker"
cmdArgs := []string{"run", "-v", "~/exp/a.out:/a.out", "ubuntu:14.04", "/a.out", "-m", "10m"}
fmt.Println(cmd + " " + strings.Join(cmdArgs, " "))
out, err := exec.Command(cmd, cmdArgs...).Output()
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s", out)
}
func main() {
ExampleCmd_Output()
}
EDIT: After a comment, I tried executing the command "docker images". It works if I run the executable with sudo. That is, I am using the following line in the code now.
out, err := exec.Command(cmd, "images").Output()
After doing go build and running "sudo ./cmd", I get the output of docker images command. However, without sudo, I still get exit status 1. But with docker run command above even with sudo, I don't get an output.
答案1
得分: 25
感谢https://stackoverflow.com/questions/24095661/os-exec-sudo-command-in-go，现在我能够做我想做的事情了。
func main() {
cmdStr := "sudo docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m"
out, _ := exec.Command("/bin/sh", "-c", cmdStr).Output()
fmt.Printf("%s", out)
}
输出：
Hello World
英文:
Thanks to https://stackoverflow.com/questions/24095661/os-exec-sudo-command-in-go, I am now able to do what I want.
func main() {
cmdStr := "sudo docker run -v ~/exp/a.out:/a.out ubuntu:14.04 /a.out -m 10m"
out, _ := exec.Command("/bin/sh", "-c", cmdStr).Output()
fmt.Printf("%s", out)
}
Output:
Hello World
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