无法在 Alpine 容器中使用 os.exec 通过 shell 运行 kubectl 命令

Question

我正在尝试从我的容器中运行一些 kubectl 命令。package mainimport (    "fmt"    "os/exec")    op, err := GetPods("test-containers", "qa")    if err != nil {        fmt.Printf("\nError: %v", err)    }    fmt.Printf(op)func GetPods(name, namespace string) (podName string, err error) {    fmt.Println("Get pod names ....")    cmd := "kubectl get pods -n " + namespace + " -o wide | grep " + name + " | awk '{print $1}' "    cmnd, err := exec.Command("sh", "-c", cmd).Output()    if err != nil {        fmt.Println("Failed to find pod name." + string(cmnd))    }    podName = string(cmnd)    return}我的多级 Dockerfile 基于 Alpine3.6 并安装了 kubectl 二进制文件。FROM alpine:3.6RUN apk add --update curl wget ca-certificates unzip python py-pip openssl bash && \    apk --update add openssh-client && \    apk --update add --virtual build-dependencies python-dev libffi-dev openssl-dev build-base && \    apk add --no-cache --upgrade bash && \    pip install --upgrade pip cffi && \    pip install awscli && \    wget  https://storage.googleapis.com/kubernetes-release/release/v1.15.1/bin/linux/amd64/kubectl && \    chmod u+x kubectl && mv kubectl /bin/kubectl && \    apk del build-dependencies && \    rm -rf /var/cache/apk/*ENV HOME=/go/app/WORKDIR /go/appCOPY --from=go-container-build /go/app/ .ENTRYPOINT ["bash"]当我将容器作为 pod 运行并尝试执行命令时；我总是遇到以下错误：cmd:  kubectl -n qa get pods -o wide | grep test-containers | awk '{print $1}'Failed to find pod name.exit status 2/bin/sh: illegal option -我也尝试过使用 os.exec.Command() exec.Command("/bin/sh", "-c", cmd)，exec.Command("/bin/bash", "-c", cmd)但我遇到了类似的错误。Failed to find pod name.exit status 2/bin/sh: illegal option -我也直接试过cmnd := exec.Command(cmd)；但我得到了错误：Failed to find pod name.fork/exec kubectl -n qa get pods -o wide | grep test-containers | awk '{print $1}':executable file not found in $PATH我已经在容器中安装了 bash，当我直接在容器 shell 上运行命令时，我总是得到输出。

Answer 1

/bin/sh: 非法选项 -

是因为-carg 解析器将其解释为/bin/sh "- "- 具有讽刺意味的是（？）您的golang代码段是正确的，但是您粘贴的代码部分和问题的症结显示了错误的语法

无需涉及busybox或其他任何东西，就可以轻松地重现这一点

package main

import (

    "fmt"

    "os/exec"

)

func main() {

    // c, err := exec.Command("/bin/sh", "-c", "echo -n hello | grep lo").Output()

    c, err := exec.Command("/bin/sh", "-c ", "echo -n hello | grep lo").Output()

    if err != nil {

        ee := err.(*exec.ExitError)

        panic(fmt.Errorf("c is %q and err is %q and stderr is %q", string(c), err, string(ee.Stderr)))

    }

    fmt.Println("OK")

}

结果，panic: c is "" and err is "exit status 2" and stderr is "/bin/sh: - : invalid option\n如果交换注释行，它会打印OK