DockerCLI/cli-plugins/examples/helloworld/main.go

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package main
import (
"context"
"fmt"
"os"
"github.com/docker/cli/cli-plugins/manager"
"github.com/docker/cli/cli-plugins/plugin"
"github.com/docker/cli/cli/command"
"github.com/spf13/cobra"
)
func main() {
plugin.Run(func(dockerCli command.Cli) *cobra.Command {
goodbye := &cobra.Command{
Use: "goodbye",
Short: "Say Goodbye instead of Hello",
Run: func(cmd *cobra.Command, _ []string) {
fmt.Fprintln(dockerCli.Out(), "Goodbye World!")
},
}
apiversion := &cobra.Command{
Use: "apiversion",
Short: "Print the API version of the server",
RunE: func(_ *cobra.Command, _ []string) error {
cli := dockerCli.Client()
ping, err := cli.Ping(context.Background())
if err != nil {
return err
}
fmt.Println(ping.APIVersion)
return nil
},
}
exitStatus2 := &cobra.Command{
Use: "exitstatus2",
Short: "Exit with status 2",
RunE: func(_ *cobra.Command, _ []string) error {
fmt.Fprintln(dockerCli.Err(), "Exiting with error status 2")
os.Exit(2)
return nil
},
}
var (
who, context string
preRun, debug bool
)
cmd := &cobra.Command{
Use: "helloworld",
Short: "A basic Hello World plugin for tests",
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
if err := plugin.PersistentPreRunE(cmd, args); err != nil {
return err
}
if preRun {
fmt.Fprintf(dockerCli.Err(), "Plugin PersistentPreRunE called")
}
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
if debug {
fmt.Fprintf(dockerCli.Err(), "Plugin debug mode enabled")
}
switch context {
case "Christmas":
fmt.Fprintf(dockerCli.Out(), "Merry Christmas!\n")
return nil
case "":
// nothing
}
if who == "" {
who, _ = dockerCli.ConfigFile().PluginConfig("helloworld", "who")
}
if who == "" {
who = "World"
}
fmt.Fprintf(dockerCli.Out(), "Hello %s!\n", who)
dockerCli.ConfigFile().SetPluginConfig("helloworld", "lastwho", who)
return dockerCli.ConfigFile().Save()
},
}
flags := cmd.Flags()
flags.StringVar(&who, "who", "", "Who are we addressing?")
flags.BoolVar(&preRun, "pre-run", false, "Log from prerun hook")
// These are intended to deliberately clash with the CLIs own top
// level arguments.
flags.BoolVarP(&debug, "debug", "D", false, "Enable debug")
flags.StringVarP(&context, "context", "c", "", "Is it Christmas?")
cmd.AddCommand(goodbye, apiversion, exitStatus2)
return cmd
},
manager.Metadata{
SchemaVersion: "0.1.0",
Vendor: "Docker Inc.",
Version: "testing",
Experimental: os.Getenv("HELLO_EXPERIMENTAL") != "",
})
}