package client import ( "fmt" "io" "golang.org/x/net/context" Cli "github.com/docker/docker/cli" flag "github.com/docker/docker/pkg/mflag" "github.com/docker/docker/pkg/stdcopy" "github.com/docker/engine-api/types" ) 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) c, err := cli.client.ContainerInspect(context.Background(), name) if 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) } options := types.ContainerLogsOptions{ ShowStdout: true, ShowStderr: true, Since: *since, Timestamps: *times, Follow: *follow, Tail: *tail, } responseBody, err := cli.client.ContainerLogs(context.Background(), name, options) if err != nil { return err } defer responseBody.Close() if c.Config.Tty { _, err = io.Copy(cli.out, responseBody) } else { _, err = stdcopy.StdCopy(cli.out, cli.err, responseBody) } return err }