From f27e6dec95533cbc2c2e1a83b4b0e3ca18097cc8 Mon Sep 17 00:00:00 2001
From: Michael Marsh <mmarsh@cs.umd.edu>
Date: Mon, 19 Feb 2018 08:38:42 -0500
Subject: [PATCH] check inputs
---
netem.py | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/netem.py b/netem.py
index 249cdc7..6ae0d66 100755
--- a/netem.py
+++ b/netem.py
@@ -28,11 +28,19 @@ parser.add_argument('-L', '--loss',
args = parser.parse_args()
+if args.device is None:
+ print STDERR, 'You must specify a device with --device.'
+ exit 1
+if args.namespace is None:
+ print STDERR, 'You must specify a network namespace with --namespace.'
+ exit 1
+
# Enable network emulation on the device.
cmd = ["sudo", "/sbin/ip",
"netns", "exec", args.namespace,
"tc", "qdisc", "change", "dev", args.device, "root",
"netem"]
+
if args.delay is not None:
cmd.append("delay")
cmd.append(str(args.delay))
--
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