test of viper and glog combination

main.go

package main
  
import (
        "flag"
        "fmt"

        "github.com/golang/glog"
        "github.com/spf13/cobra"
        "github.com/spf13/pflag"
        "github.com/spf13/viper"
)

var (
        RootCmd = &cobra.Command{
                Use: "test",
                Run: func(cmd *cobra.Command, args []string) {
                        glog.Infof("glog info level")
                        fmt.Printf("get a value from viper: %s\n", viper.GetString("viper-test"))
                },
        }
)

func init() {
        pflag.CommandLine.AddGoFlagSet(flag.CommandLine)

        // For https://github.com/kubernetes/kubernetes/issues/17162#issuecomment-225596212
        flag.CommandLine.Parse([]string{})

        RootCmd.PersistentFlags().String("viper-test", "foo", "some flag for viper test")
        viper.BindPFlag("viper-test", RootCmd.PersistentFlags().Lookup("viper-test"))
}

func main() {
        RootCmd.Execute()
}

/*
$ go run main.go -h
Usage:
  test [flags]

Flags:
      --alsologtostderr                  log to standard error as well as files
  -h, --help                             help for test
      --log_backtrace_at traceLocation   when logging hits line file:N, emit a stack trace (default :0)
      --log_dir string                   If non-empty, write log files in this directory
      --logtostderr                      log to standard error instead of files
      --stderrthreshold severity         logs at or above this threshold go to stderr (default 2)
  -v, --v Level                          log level for V logs
      --viper-test string                some flag for viper test (default "foo")
      --vmodule moduleSpec               comma-separated list of pattern=N settings for file-filtered logging


$ go run main.go --viper-test=bar --stderrthreshold=info
I1126 14:24:55.255628    1150 main.go:17] glog info level
get a value from viper: bar
*/