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在 vanilla go 中,设置环境变量似乎很简单。该os库具有Setenv应该完成工作的功能。我在 cobra 命令中遇到了麻烦。有没有我遗漏的简单方法,或者目前不支持此功能?

我正在尝试做的示例:

package main

import (
    "fmt"
    "os"

    "github.com/spf13/cobra"
    "github.com/spf13/pflag"

    "k8s.io/cli-runtime/pkg/genericclioptions"
)

func main() {
    flags := pflag.NewFlagSet("ex-com", pflag.ExitOnError)
    pflag.CommandLine = flags

    root := newCmdEx(genericclioptions.IOStreams{In: os.Stdin, Out: os.Stdout, ErrOut: os.Stderr})
    if err := root.Execute(); err != nil {
        fmt.Fprintf(os.Stdout, "Error: %[1]s", err.Error())
        os.Exit(1)
    }
    os.Exit(0)
}

type ExOpOptions struct {
    configFlags genericclioptions.ConfigFlags
}

func NewExOpOptions(streams genericclioptions.IOStreams) *ExOpOptions {
    return &ExOpOptions{}
}

func newCmdEx(streams genericclioptions.IOStreams) *cobra.Command {
    o := NewExOpOptions(streams)

    cmd := &cobra.Command{
        RunE: func(c *cobra.Command, args []string) error {
            return o.Run()
        },
    }

    o.configFlags.AddFlags(cmd.Flags())

    return cmd
}

func (o *ExOpOptions) Run() error {
    return os.Setenv("THEBESTOFTIMES", "Sure it was.")
}

示例构建和测试脚本:

GO111MODULE="on" go build cmd/ex-com.go && \
   echo "First Print:" && \
   echo "$THEBESTOFTIMES" && \
   ./ex-com && \
   echo "Second Print:" && \
   echo "$THEBESTOFTIMES"

我希望输出看起来像这样(因为环境变量是在 go 代码的第 48 行设置的):

go: finding k8s.io/cli-runtime/pkg/genericclioptions latest
go: finding k8s.io/cli-runtime/pkg latest
go: finding k8s.io/cli-runtime latest
First Print:

Second Print:
Sure it was.

但目前它看起来像这样:

go: finding k8s.io/cli-runtime/pkg/genericclioptions latest
go: finding k8s.io/cli-runtime/pkg latest
go: finding k8s.io/cli-runtime latest
First Print:

Second Print:

4

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