Some cleanup around logs

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

libcontainer/apparmor/apparmor.go

@@ -1,42 +1,29 @@
 package apparmor
 
 import (
-	"errors"
 	"fmt"
 	"io/ioutil"
-	"log"
 	"os"
 )
 
-var AppArmorEnabled bool
-
-var (
-	ErrAppArmorDisabled = errors.New("Error: AppArmor is not enabled on this system")
-)
-
-func init() {
+func IsEnabled() bool {
 	buf, err := ioutil.ReadFile("/sys/module/apparmor/parameters/enabled")
-	AppArmorEnabled = err == nil && len(buf) > 1 && buf[0] == 'Y'
+	return err == nil && len(buf) > 1 && buf[0] == 'Y'
 }
 
 func ApplyProfile(pid int, name string) error {
-	if !AppArmorEnabled {
-		return ErrAppArmorDisabled
+	if !IsEnabled() || name == "" {
+		return nil
 	}
 
 	f, err := os.OpenFile(fmt.Sprintf("/proc/%d/attr/current", pid), os.O_WRONLY, 0)
 	if err != nil {
-		log.Printf("error open: %s\n", err)
 		return err
 	}
 	defer f.Close()
 
 	if _, err := fmt.Fprintf(f, "changeprofile %s", name); err != nil {
-		log.Printf("changeprofile %s", name)
-		log.Printf("Error write: %s\n", err)
 		return err
-	} else {
-		log.Printf("Write success!")
 	}
 	return nil
 }

libcontainer/nsinit/init.go

@@ -32,8 +32,6 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
 	syncPipe.Close()
 
 	if console != "" {
-		// close pipes so that we can replace it with the pty
-		//		closeStdPipes()
 		slave, err := system.OpenTerminal(console, syscall.O_RDWR)
 		if err != nil {
 			return fmt.Errorf("open terminal %s", err)
@@ -51,10 +49,10 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
 		}
 	}
 
-	/*
-		if err := system.ParentDeathSignal(); err != nil {
-			return fmt.Errorf("parent death signal %s", err)
-		}
+	/* this is commented out so that we get the current Ghost functionality
+	if err := system.ParentDeathSignal(); err != nil {
+		return fmt.Errorf("parent death signal %s", err)
+	}
 	*/
 
 	if err := setupNewMountNamespace(rootfs, console, container.ReadonlyFs); err != nil {
@@ -62,9 +60,7 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
 	}
 
 	if err := apparmor.ApplyProfile(os.Getpid(), container.Context["apparmor_profile"]); err != nil {
-		if err != apparmor.ErrAppArmorDisabled {
-			return err
-		}
+		return err
 	}
 
 	if err := setupNetwork(container, context); err != nil {