Imports of package chroot

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/dotcloud/docker/execdriver
github.com/dotcloud/docker/pkg/mount
osPackage os provides a platform-independent interface to operating system functionality.
os/execPackage exec runs external commands.
syscallPackage syscall contains an interface to the low-level operating system primitives.