package system import ( "context" "fmt" "os" "text/template" "github.com/containers/podman/v2/cmd/podman/parse" "github.com/containers/podman/v2/cmd/podman/registry" "github.com/containers/podman/v2/cmd/podman/validate" "github.com/containers/podman/v2/libpod/events" "github.com/containers/podman/v2/pkg/domain/entities" "github.com/pkg/errors" "github.com/spf13/cobra" ) var ( eventsDescription = `Monitor podman events. By default, streaming mode is used, printing new events as they occur. Previous events can be listed via --since and --until.` eventsCommand = &cobra.Command{ Use: "events", Args: validate.NoArgs, Short: "Show podman events", Long: eventsDescription, RunE: eventsCmd, Example: `podman events podman events --filter event=create podman events --format {{.Image}} podman events --since 1h30s`, } ) var ( eventOptions entities.EventsOptions eventFormat string ) func init() { registry.Commands = append(registry.Commands, registry.CliCommand{ Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode}, Command: eventsCommand, }) flags := eventsCommand.Flags() flags.StringArrayVar(&eventOptions.Filter, "filter", []string{}, "filter output") flags.StringVar(&eventFormat, "format", "", "format the output using a Go template") flags.BoolVar(&eventOptions.Stream, "stream", true, "stream new events; for testing only") flags.StringVar(&eventOptions.Since, "since", "", "show all events created since timestamp") flags.StringVar(&eventOptions.Until, "until", "", "show all events until timestamp") _ = flags.MarkHidden("stream") } func eventsCmd(cmd *cobra.Command, _ []string) error { if len(eventOptions.Since) > 0 || len(eventOptions.Until) > 0 { eventOptions.FromStart = true } eventChannel := make(chan *events.Event, 1) eventOptions.EventChan = eventChannel errChannel := make(chan error) var ( tmpl *template.Template doJSON bool ) if cmd.Flags().Changed("format") { doJSON = parse.MatchesJSONFormat(eventFormat) if !doJSON { var err error tmpl, err = template.New("events").Parse(eventFormat) if err != nil { return err } } } go func() { err := registry.ContainerEngine().Events(context.Background(), eventOptions) errChannel <- err }() for event := range eventChannel { switch { case event == nil: // no-op case doJSON: jsonStr, err := event.ToJSONString() if err != nil { return errors.Wrapf(err, "unable to format json") } fmt.Println(jsonStr) case cmd.Flags().Changed("format"): if err := tmpl.Execute(os.Stdout, event); err != nil { return err } fmt.Println("") default: fmt.Println(event.ToHumanReadable()) } } return <-errChannel }