From 0dc82f0bc334c529977a873bcc243f46379cfbc8 Mon Sep 17 00:00:00 2001
From: rusty-snake <41237666+rusty-snake@users.noreply.github.com>
Date: Fri, 4 Jun 2021 07:59:09 +0200
Subject: Better error message for jail_prober.py cli usage

Curerently sys.argv is accessed without checks, resulting in an
IndexError:
```
Traceback (most recent call last):
  File "/home/rusty-snake/Projects/firejail/contrib/jail_prober.py", line 205, in <module>
    main()
  File "/home/rusty-snake/Projects/firejail/contrib/jail_prober.py", line 170, in main
    profile_path = sys.argv[1]
IndexError: list index out of range
```

This commit catches this IndexError and prints a more helpfull message
instaed:
```
USAGE: jail_prober.py <PROFILE-PATH> <PROGRAM>
```
---
 contrib/jail_prober.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'contrib')

diff --git a/contrib/jail_prober.py b/contrib/jail_prober.py
index 95e299624..f89f97ac4 100755
--- a/contrib/jail_prober.py
+++ b/contrib/jail_prober.py
@@ -164,8 +164,12 @@ def run_firejail(program, all_args):
 
 
 def main():
-    profile_path = sys.argv[1]
-    program = sys.argv[2]
+    try:
+        profile_path = sys.argv[1]
+        program = sys.argv[2]
+    except IndexError:
+        print('USAGE: jail_prober.py <PROFILE-PATH> <PROGRAM>')
+        sys.exit()
     # Quick error check and extract arguments
     check_params(profile_path)
     profile = get_args(profile_path)
-- 
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