package main import ( "os" "time" "github.com/containers/libpod/cmd/podman/cliconfig" "github.com/containers/libpod/cmd/podman/libpodruntime" "github.com/containers/libpod/libpod" "github.com/containers/libpod/pkg/logs" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/spf13/cobra" ) var ( logsCommand cliconfig.LogsValues logsDescription = "The podman logs command batch-retrieves whatever logs are present for a container at the time of execution. This does not guarantee execution" + "order when combined with podman run (i.e. your run may not have generated any logs at the time you execute podman logs" _logsCommand = &cobra.Command{ Use: "logs", Short: "Fetch the logs of a container", Long: logsDescription, RunE: func(cmd *cobra.Command, args []string) error { logsCommand.InputArgs = args logsCommand.GlobalFlags = MainGlobalOpts return logsCmd(&logsCommand) }, Example: `podman logs ctrID podman logs --tail 2 mywebserver podman logs --follow=true --since 10m ctrID`, } ) func init() { logsCommand.Command = _logsCommand logsCommand.SetUsageTemplate(UsageTemplate()) flags := logsCommand.Flags() flags.BoolVar(&logsCommand.Details, "details", false, "Show extra details provided to the logs") flags.BoolVarP(&logsCommand.Follow, "follow", "f", false, "Follow log output. The default is false") flags.BoolVarP(&logsCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of") flags.StringVar(&logsCommand.Since, "since", "", "Show logs since TIMESTAMP") flags.Uint64Var(&logsCommand.Tail, "tail", 0, "Output the specified number of LINES at the end of the logs. Defaults to 0, which prints all lines") flags.BoolVarP(&logsCommand.Timestamps, "timestamps", "t", false, "Output the timestamps in the log") flags.MarkHidden("details") flags.SetInterspersed(false) markFlagHiddenForRemoteClient("latest", flags) } func logsCmd(c *cliconfig.LogsValues) error { var ctr *libpod.Container var err error runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand) if err != nil { return errors.Wrapf(err, "could not get runtime") } defer runtime.Shutdown(false) args := c.InputArgs if len(args) != 1 && !c.Latest { return errors.Errorf("'podman logs' requires exactly one container name/ID") } sinceTime := time.Time{} if c.Flag("since").Changed { // parse time, error out if something is wrong since, err := parseInputTime(c.Since) if err != nil { return errors.Wrapf(err, "could not parse time: %q", c.Since) } sinceTime = since } opts := &logs.LogOptions{ Details: c.Details, Follow: c.Follow, Since: sinceTime, Tail: c.Tail, Timestamps: c.Timestamps, } if c.Latest { ctr, err = runtime.GetLatestContainer() } else { ctr, err = runtime.LookupContainer(args[0]) } if err != nil { return err } logPath := ctr.LogPath() state, err := ctr.State() if err != nil { return err } // If the log file does not exist yet and the container is in the // Configured state, it has never been started before and no logs exist // Exit cleanly in this case if _, err := os.Stat(logPath); err != nil { if state == libpod.ContainerStateConfigured { logrus.Debugf("Container has not been started, no logs exist yet") return nil } } return logs.ReadLogs(logPath, ctr, opts) } // parseInputTime takes the users input and to determine if it is valid and // returns a time format and error. The input is compared to known time formats // or a duration which implies no-duration func parseInputTime(inputTime string) (time.Time, error) { timeFormats := []string{time.RFC3339Nano, time.RFC3339, "2006-01-02T15:04:05", "2006-01-02T15:04:05.999999999", "2006-01-02Z07:00", "2006-01-02"} // iterate the supported time formats for _, tf := range timeFormats { t, err := time.Parse(tf, inputTime) if err == nil { return t, nil } } // input might be a duration duration, err := time.ParseDuration(inputTime) if err != nil { return time.Time{}, errors.Errorf("unable to interpret time value") } return time.Now().Add(-duration), nil }