[PATCH] tuna: Fix cgroup process run without a terminal

[Leah Leshchinsky]

When process not run with terminal, no column information will be
available through 'stty' command.

Set default width to 80 to account for this condition.

Signed-off-by: Leah Leshchinsky <lleshchi(a)redhat.com&gt;

---
target branch: getopt
pull from: [e-mail]:lleshchi/tuna.git
branch: getopt_format
commit: 4a27664a3e2584e76b336084951933559ab58c34

diff --git a/tuna-cmd.py b/tuna-cmd.py
index 54dc567..42aa326 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -353,10 +353,15 @@ def ps_show(ps, affect_children, thread_list, cpu_list,
     ps_list.sort()
 
     # Width of terminal in columns
-    columns = None
-    if cgroups:
-        _, columns = os.popen('stty size', 'r').read().split()
 
+    columns = 80
+    if cgroups:
+        try:
+            # This can fail if not running on a term, default to 80 in that case
+            with os.popen('stty size', 'r') as p:
+                _, columns = p.read().split()
+        except:
+            pass
     for pid in ps_list:
         ps_show_thread(pid, affect_children, ps, has_ctxt_switch_info,
                        sock_inodes, sock_inode_re, cgroups, columns, compact)
-- 
2.38.1