Add a netstat per container

From: Daniel Lezcano <dlezcano@fr.ibm.com>

Added the ability to do netstat from outside of the container to see
network resources used by the container.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>

src/lxc/Makefile.am

@@ -43,6 +43,7 @@ liblxc_la_LDFLAGS = -release @PACKAGE_VERSION@
 bin_SCRIPTS = \
 	lxc-ps \
 	lxc-ls \
+	lxc-netstat \
 	lxc-checkconfig
 
 bin_PROGRAMS = \

src/lxc/lxc-netstat.in

@@ -0,0 +1,39 @@
+#!/bin/bash
+# set -ex
+
+prefix=@prefix@
+lxcpath=@localstatedir@/lxc
+
+if [ ! -r $lxcpath ]; then
+    exit 0
+fi
+
+if [ $# -eq  0 ]; then
+    echo "usage: $0 -n <name>"
+    exit 1
+fi
+
+for i in $*; do
+    case $i in
+	-n)
+	    name=$2; shift 2;;
+    esac
+done
+
+if [ -z "$name" ]; then
+    echo "usage: $0 -n <name>"
+    exit 1
+fi
+
+if [ ! -d $lxcpath/$name ]; then
+    echo "'$name' does not exists"
+    exit 1
+fi
+
+if [ ! -f $lxcpath/$name/init ]; then
+    exit 0
+fi
+
+initpid=$(cat $lxcpath/$name/init)
+
+mount --bind /proc/$initpid/net /proc/$$/net && exec netstat $*