Cleanup from CR.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

daemon.go

@@ -1,11 +1,5 @@
 package main
 
-import (
-	"os"
-	"os/exec"
-	"syscall"
-)
-
 const daemonBinary = "dockerd"
 
 // DaemonProxy acts as a cli.Handler to proxy calls to the daemon binary
@@ -15,29 +9,3 @@ type DaemonProxy struct{}
 func NewDaemonProxy() DaemonProxy {
 	return DaemonProxy{}
 }
-
-// CmdDaemon execs dockerd with the same flags
-// TODO: add a deprecation warning?
-func (p DaemonProxy) CmdDaemon(args ...string) error {
-	args = stripDaemonArg(os.Args[1:])
-
-	binaryAbsPath, err := exec.LookPath(daemonBinary)
-	if err != nil {
-		return err
-	}
-
-	return syscall.Exec(
-		binaryAbsPath,
-		append([]string{daemonBinary}, args...),
-		os.Environ())
-}
-
-// stripDaemonArg removes the `daemon` argument from the list
-func stripDaemonArg(args []string) []string {
-	for i, arg := range args {
-		if arg == "daemon" {
-			return append(args[:i], args[i+1:]...)
-		}
-	}
-	return args
-}

daemon_unix.go

@@ -0,0 +1,37 @@
+// +build !windows
+
+package main
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+// CmdDaemon execs dockerd with the same flags
+// TODO: add a deprecation warning?
+func (p DaemonProxy) CmdDaemon(args ...string) error {
+	// Use os.Args[1:] so that "global" args are passed to dockerd
+	args = stripDaemonArg(os.Args[1:])
+
+	// TODO: check dirname args[0] first
+	binaryAbsPath, err := exec.LookPath(daemonBinary)
+	if err != nil {
+		return err
+	}
+
+	return syscall.Exec(
+		binaryAbsPath,
+		append([]string{daemonBinary}, args...),
+		os.Environ())
+}
+
+// stripDaemonArg removes the `daemon` argument from the list
+func stripDaemonArg(args []string) []string {
+	for i, arg := range args {
+		if arg == "daemon" {
+			return append(args[:i], args[i+1:]...)
+		}
+	}
+	return args
+}

daemon_windows.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"fmt"
+)
+
+// CmdDaemon reports on an error on windows, because there is no exec
+func (p DaemonProxy) CmdDaemon(args ...string) error {
+	return fmt.Errorf(
+		"`docker daemon` does not exist on windows. Please run `dockerd` directly")
+}

daemon_windows_test.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestCmdDaemon(t *testing.T) {
+	proxy := NewDaemonProxy()
+	err := proxy.CmdDaemon("--help")
+	if err == nil {
+		t.Fatal("Expected CmdDaemon to fail in Windows.")
+	}
+
+	if !strings.Contains(err.Error(), "Please run `dockerd`") {
+		t.Fatalf("Expected an error about running dockerd, got %s", err)
+	}
+}

docker.go

@@ -9,16 +9,11 @@ import (
 	"github.com/docker/docker/cli"
 	"github.com/docker/docker/dockerversion"
 	flag "github.com/docker/docker/pkg/mflag"
-	"github.com/docker/docker/pkg/reexec"
 	"github.com/docker/docker/pkg/term"
 	"github.com/docker/docker/utils"
 )
 
 func main() {
-	if reexec.Init() {
-		return
-	}
-
 	// Set terminal emulation based on platform as required.
 	stdin, stdout, stderr := term.StdStreams()