builder/amazon/chroot: quote commands and pass through a shell [GH-581]

CHANGELOG.md

@@ -14,6 +14,7 @@ IMPROVEMENTS:
 
 BUG FIXES:
 
+* builder/amazon/chroot: Chroot commands work with shell provisioners. [GH-581]
 * builder/vmware: VMX modifications are now case-insensitive. [GH-608]
 
 ## 0.3.11 (November 4, 2013)

builder/amazon/chroot/communicator.go

@@ -21,7 +21,7 @@ type Communicator struct {
 
 func (c *Communicator) Start(cmd *packer.RemoteCmd) error {
 	command, err := c.CmdWrapper(
-		fmt.Sprintf("chroot %s %s", c.Chroot, cmd.Command))
+		fmt.Sprintf("chroot %s /bin/sh -c \"%s\"", c.Chroot, cmd.Command))
 	if err != nil {
 		return err
 	}