From d4ea33bf43834e2efe9d67fabbd3daabc6b5bb71 Mon Sep 17 00:00:00 2001
From: Michael Crosby <michael@crosbymichael.com>
Date: Fri, 11 Apr 2014 15:15:28 +0000
Subject: [PATCH] Move rest of console functions to pkg
 Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com>
 (github: crosbymichael)

---
 console/console.go | 14 ++++++++++++++
 nsinit/init.go     | 34 ++++++++--------------------------
 2 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/console/console.go b/console/console.go
index deee5441..05cd08a9 100644
--- a/console/console.go
+++ b/console/console.go
@@ -44,3 +44,17 @@ func Setup(rootfs, consolePath, mountLabel string) error {
 	}
 	return nil
 }
+
+func OpenAndDup(consolePath string) error {
+	slave, err := system.OpenTerminal(consolePath, syscall.O_RDWR)
+	if err != nil {
+		return fmt.Errorf("open terminal %s", err)
+	}
+	if err := system.Dup2(slave.Fd(), 0); err != nil {
+		return err
+	}
+	if err := system.Dup2(slave.Fd(), 1); err != nil {
+		return err
+	}
+	return system.Dup2(slave.Fd(), 2)
+}
diff --git a/nsinit/init.go b/nsinit/init.go
index 6e6b0e5a..9aac9a40 100644
--- a/nsinit/init.go
+++ b/nsinit/init.go
@@ -12,6 +12,7 @@ import (
 	"github.com/dotcloud/docker/pkg/label"
 	"github.com/dotcloud/docker/pkg/libcontainer"
 	"github.com/dotcloud/docker/pkg/libcontainer/capabilities"
+	"github.com/dotcloud/docker/pkg/libcontainer/console"
 	"github.com/dotcloud/docker/pkg/libcontainer/mount"
 	"github.com/dotcloud/docker/pkg/libcontainer/network"
 	"github.com/dotcloud/docker/pkg/libcontainer/security/apparmor"
@@ -22,7 +23,7 @@ import (
 
 // Init is the init process that first runs inside a new namespace to setup mounts, users, networking,
 // and other options required for the new container.
-func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, console string, syncPipe *SyncPipe, args []string) error {
+func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consolePath string, syncPipe *SyncPipe, args []string) error {
 	rootfs, err := utils.ResolveRootfs(uncleanRootfs)
 	if err != nil {
 		return err
@@ -38,20 +39,16 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
 	ns.logger.Println("received context from parent")
 	syncPipe.Close()
 
-	if console != "" {
-		ns.logger.Printf("setting up %s as console\n", console)
-		slave, err := system.OpenTerminal(console, syscall.O_RDWR)
-		if err != nil {
-			return fmt.Errorf("open terminal %s", err)
-		}
-		if err := dupSlave(slave); err != nil {
-			return fmt.Errorf("dup2 slave %s", err)
+	if consolePath != "" {
+		ns.logger.Printf("setting up %s as console\n", consolePath)
+		if err := console.OpenAndDup(consolePath); err != nil {
+			return err
 		}
 	}
 	if _, err := system.Setsid(); err != nil {
 		return fmt.Errorf("setsid %s", err)
 	}
-	if console != "" {
+	if consolePath != "" {
 		if err := system.Setctty(); err != nil {
 			return fmt.Errorf("setctty %s", err)
 		}
@@ -62,7 +59,7 @@ func (ns *linuxNs) Init(container *libcontainer.Container, uncleanRootfs, consol
 
 	label.Init()
 	ns.logger.Println("setup mount namespace")
-	if err := mount.InitializeMountNamespace(rootfs, console, container); err != nil {
+	if err := mount.InitializeMountNamespace(rootfs, consolePath, container); err != nil {
 		return fmt.Errorf("setup mount namespace %s", err)
 	}
 	if err := system.Sethostname(container.Hostname); err != nil {
@@ -116,21 +113,6 @@ func setupUser(container *libcontainer.Container) error {
 	return nil
 }
 
-// dupSlave dup2 the pty slave's fd into stdout and stdin and ensures that
-// the slave's fd is 0, or stdin
-func dupSlave(slave *os.File) error {
-	if err := system.Dup2(slave.Fd(), 0); err != nil {
-		return err
-	}
-	if err := system.Dup2(slave.Fd(), 1); err != nil {
-		return err
-	}
-	if err := system.Dup2(slave.Fd(), 2); err != nil {
-		return err
-	}
-	return nil
-}
-
 // setupVethNetwork uses the Network config if it is not nil to initialize
 // the new veth interface inside the container for use by changing the name to eth0
 // setting the MTU and IP address along with the default gateway