[linux-user-chroot] newnet: Improve docs some more

[Colin Walters <walters src gnome org>]

commit 976957b0067c17612dc889dbeb52d94cedfdcb31
Author: Colin Walters <walters verbum org>
Date:   Tue Mar 13 14:37:41 2012 -0400

    newnet: Improve docs some more
    
    Suggested by Owen Taylor <otaylor redhat com>

 README.newnet                  |   13 +++++++++++++
 src/linux-user-chroot-newnet.c |    2 +-
 2 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/README.newnet b/README.newnet
index 2c247ec..84ea79b 100644
--- a/README.newnet
+++ b/README.newnet
@@ -27,3 +27,16 @@ network namespace is very high - it does mean that e.g. one could make
 But most setuid programs *should* be carefully checking errors
 anyways.
 
+Building
+--------
+
+To enable building this helper, pass --enable-newnet-helper to
+configure.
+
+Running
+-------
+
+$ linux-user-chroot-newnet curl http://google.com
+curl: (6) Could not resolve host: google.com; Unknown error
+$ linux-user-chroot-newnet /bin/bash
+$ # you're now in a shell without networking
diff --git a/src/linux-user-chroot-newnet.c b/src/linux-user-chroot-newnet.c
index c08c51e..f8397d1 100644
--- a/src/linux-user-chroot-newnet.c
+++ b/src/linux-user-chroot-newnet.c
@@ -81,7 +81,7 @@ main (int      argc,
   argv++;
 
   if (argc < 1)
-    fatal ("PROGRAM argument must be specified");
+    fatal ("PROGRAM [ARGS]... Run PROGRAM in an isolated network namespace");
 
   program = argv[0];
   program_argv = argv;