remove client-side for supported logging drivers

The `docker logs` command performed a
client-side check if the container's
logging driver was supported.

Now that we allow the client to connect
to both "older" and "newer" daemon versions,
this check is best done daemon-side.

This patch remove the check on the client
side, and leaves validation to the daemon,
which should be the source of truth.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 8246c49498
Component: cli

components/cli/command/container/logs.go

@@ -1,7 +1,6 @@
 package container
 
 import (
-	"fmt"
 	"io"
 
 	"golang.org/x/net/context"
@@ -13,11 +12,6 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var validDrivers = map[string]bool{
-	"json-file": true,
-	"journald":  true,
-}
-
 type logsOptions struct {
 	follow     bool
 	since      string
@@ -54,15 +48,6 @@ func NewLogsCommand(dockerCli *command.DockerCli) *cobra.Command {
 func runLogs(dockerCli *command.DockerCli, opts *logsOptions) error {
 	ctx := context.Background()
 
-	c, err := dockerCli.Client().ContainerInspect(ctx, opts.container)
-	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,
@@ -78,6 +63,11 @@ func runLogs(dockerCli *command.DockerCli, opts *logsOptions) error {
 	}
 	defer responseBody.Close()
 
+	c, err := dockerCli.Client().ContainerInspect(ctx, opts.container)
+	if err != nil {
+		return err
+	}
+
 	if c.Config.Tty {
 		_, err = io.Copy(dockerCli.Out(), responseBody)
 	} else {