From e3ab74e09f9f5b73a5efa046b4b8498487a9cdf5 Mon Sep 17 00:00:00 2001
From: georgevicbell <george_vic_bell@hotmail.com>
Date: Thu, 16 Jul 2015 21:06:03 -0400
Subject: [PATCH] Add Config struct for docker PTY

---
 builder/docker/communicator.go | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/builder/docker/communicator.go b/builder/docker/communicator.go
index 6fedf2769..56ea3b1d3 100644
--- a/builder/docker/communicator.go
+++ b/builder/docker/communicator.go
@@ -24,10 +24,14 @@ type Communicator struct {
 	HostDir      string
 	ContainerDir string
 	Version      *version.Version
-
+	config 	     *Config
 	lock sync.Mutex
 }
 
+type Config struct {
+	// Pty, if true, will request a pty from docker with -t
+	Pty bool
+}
 func (c *Communicator) Start(remote *packer.RemoteCmd) error {
 	// Create a temporary file to store the output. Because of a bug in
 	// Docker, sometimes all the output doesn't properly show up. This
@@ -45,7 +49,11 @@ func (c *Communicator) Start(remote *packer.RemoteCmd) error {
 
 	var cmd *exec.Cmd
 	if c.canExec() {
-		cmd = exec.Command("docker", "exec", "-i", c.ContainerId, "/bin/sh")
+		if c.config.Pty {
+			cmd = exec.Command("docker", "exec", "-i", "-t", c.ContainerId, "/bin/sh")
+		} else {
+			cmd = exec.Command("docker", "exec", "-i", c.ContainerId, "/bin/sh")
+		}
 	} else {
 		cmd = exec.Command("docker", "attach", c.ContainerId)
 	}