package client import ( "encoding/json" "fmt" "net/url" "time" "github.com/docker/docker/api/types" Cli "github.com/docker/docker/cli" flag "github.com/docker/docker/pkg/mflag" "github.com/docker/docker/pkg/timeutils" ) var validDrivers = map[string]bool{ "json-file": true, "journald": true, } // CmdLogs fetches the logs of a given container. // // docker logs [OPTIONS] CONTAINER func (cli *DockerCli) CmdLogs(args ...string) error { cmd := Cli.Subcmd("logs", []string{"CONTAINER"}, Cli.DockerCommands["logs"].Description, true) follow := cmd.Bool([]string{"f", "-follow"}, false, "Follow log output") since := cmd.String([]string{"-since"}, "", "Show logs since timestamp") times := cmd.Bool([]string{"t", "-timestamps"}, false, "Show timestamps") tail := cmd.String([]string{"-tail"}, "all", "Number of lines to show from the end of the logs") cmd.Require(flag.Exact, 1) cmd.ParseFlags(args, true) name := cmd.Arg(0) serverResp, err := cli.call("GET", "/containers/"+name+"/json", nil, nil) if err != nil { return err } var c types.ContainerJSON if err := json.NewDecoder(serverResp.body).Decode(&c); err != nil { return err } if !validDrivers[c.HostConfig.LogConfig.Type] { return fmt.Errorf("\"logs\" command is supported only for \"json-file\" and \"journald\" logging drivers (got: %s)", c.HostConfig.LogConfig.Type) } v := url.Values{} v.Set("stdout", "1") v.Set("stderr", "1") if *since != "" { ts, err := timeutils.GetTimestamp(*since, time.Now()) if err != nil { return err } v.Set("since", ts) } if *times { v.Set("timestamps", "1") } if *follow { v.Set("follow", "1") } v.Set("tail", *tail) sopts := &streamOpts{ rawTerminal: c.Config.Tty, out: cli.out, err: cli.err, } _, err = cli.stream("GET", "/containers/"+name+"/logs?"+v.Encode(), sopts) return err }