Add regression tests for client debug flag.

- Add client debug info to the `docker info` command.

Signed-off-by: David Calavera <david.calavera@gmail.com>

api/client/info.go

@@ -7,6 +7,7 @@ import (
 	Cli "github.com/docker/docker/cli"
 	"github.com/docker/docker/pkg/ioutils"
 	flag "github.com/docker/docker/pkg/mflag"
+	"github.com/docker/docker/utils"
 	"github.com/docker/go-units"
 )
 
@@ -73,8 +74,10 @@ func (cli *DockerCli) CmdInfo(args ...string) error {
 	ioutils.FprintfIfNotEmpty(cli.out, "Name: %s\n", info.Name)
 	ioutils.FprintfIfNotEmpty(cli.out, "ID: %s\n", info.ID)
 
+	fmt.Fprintf(cli.out, "Debug mode (client): %v\n", utils.IsDebugEnabled())
+	fmt.Fprintf(cli.out, "Debug mode (server): %v\n", info.Debug)
+
 	if info.Debug {
-		fmt.Fprintf(cli.out, "Debug mode (server): %v\n", info.Debug)
 		fmt.Fprintf(cli.out, " File Descriptors: %d\n", info.NFd)
 		fmt.Fprintf(cli.out, " Goroutines: %d\n", info.NGoroutines)
 		fmt.Fprintf(cli.out, " System Time: %s\n", info.SystemTime)

docker/client_test.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/docker/docker/utils"
+)
+
+func TestClientDebugEnabled(t *testing.T) {
+	defer utils.DisableDebug()
+
+	clientFlags.Common.FlagSet.Parse([]string{"-D"})
+	clientFlags.PostParse()
+
+	if os.Getenv("DEBUG") != "1" {
+		t.Fatal("expected debug enabled, got false")
+	}
+	if logrus.GetLevel() != logrus.DebugLevel {
+		t.Fatalf("expected logrus debug level, got %v", logrus.GetLevel())
+	}
+}

integration-cli/docker_cli_daemon_test.go

@@ -2095,3 +2095,24 @@ func (s *DockerDaemonSuite) TestDaemonStartWithoutColors(c *check.C) {
 	newD.Stop()
 	c.Assert(b.String(), check.Not(checker.Contains), infoLog)
 }
+
+func (s *DockerDaemonSuite) TestDaemonDebugLog(c *check.C) {
+	testRequires(c, DaemonIsLinux)
+	newD := NewDaemon(c)
+
+	debugLog := "\x1b[37mDEBU\x1b"
+
+	p, tty, err := pty.Open()
+	c.Assert(err, checker.IsNil)
+	defer func() {
+		tty.Close()
+		p.Close()
+	}()
+
+	b := bytes.NewBuffer(nil)
+	go io.Copy(b, p)
+
+	newD.StartWithLogFile(tty, "--debug")
+	newD.Stop()
+	c.Assert(b.String(), checker.Contains, debugLog)
+}

integration-cli/docker_cli_info_test.go

@@ -146,3 +146,22 @@ func (s *DockerSuite) TestInfoDisplaysStoppedContainers(c *check.C) {
 	c.Assert(out, checker.Contains, fmt.Sprintf(" Paused: %d\n", 0))
 	c.Assert(out, checker.Contains, fmt.Sprintf(" Stopped: %d\n", 1))
 }
+
+func (s *DockerSuite) TestInfoDebug(c *check.C) {
+	testRequires(c, SameHostDaemon, DaemonIsLinux)
+
+	d := NewDaemon(c)
+	err := d.Start("--debug")
+	c.Assert(err, checker.IsNil)
+	defer d.Stop()
+
+	out, err := d.Cmd("--debug", "info")
+	c.Assert(err, checker.IsNil)
+	c.Assert(out, checker.Contains, "Debug mode (client): true\n")
+	c.Assert(out, checker.Contains, "Debug mode (server): true\n")
+	c.Assert(out, checker.Contains, "File Descriptors")
+	c.Assert(out, checker.Contains, "Goroutines")
+	c.Assert(out, checker.Contains, "System Time")
+	c.Assert(out, checker.Contains, "EventsListeners")
+	c.Assert(out, checker.Contains, "Docker Root Dir")
+}

utils/debug_test.go

@@ -0,0 +1,43 @@
+package utils
+
+import (
+	"os"
+	"testing"
+
+	"github.com/Sirupsen/logrus"
+)
+
+func TestEnableDebug(t *testing.T) {
+	defer func() {
+		os.Setenv("DEBUG", "")
+		logrus.SetLevel(logrus.InfoLevel)
+	}()
+	EnableDebug()
+	if os.Getenv("DEBUG") != "1" {
+		t.Fatalf("expected DEBUG=1, got %s\n", os.Getenv("DEBUG"))
+	}
+	if logrus.GetLevel() != logrus.DebugLevel {
+		t.Fatalf("expected log level %v, got %v\n", logrus.DebugLevel, logrus.GetLevel())
+	}
+}
+
+func TestDisableDebug(t *testing.T) {
+	DisableDebug()
+	if os.Getenv("DEBUG") != "" {
+		t.Fatalf("expected DEBUG=\"\", got %s\n", os.Getenv("DEBUG"))
+	}
+	if logrus.GetLevel() != logrus.InfoLevel {
+		t.Fatalf("expected log level %v, got %v\n", logrus.InfoLevel, logrus.GetLevel())
+	}
+}
+
+func TestDebugEnabled(t *testing.T) {
+	EnableDebug()
+	if !IsDebugEnabled() {
+		t.Fatal("expected debug enabled, got false")
+	}
+	DisableDebug()
+	if IsDebugEnabled() {
+		t.Fatal("expected debug disabled, got true")
+	}
+}