From 35aafb4eca5c6d059a0540c217ee4b3588953d7b Mon Sep 17 00:00:00 2001
From: Dustin Kirkland <kirkland@ubuntu.com>
Date: Tue, 23 Aug 2011 23:22:43 -0500
Subject: [PATCH] * usr/lib/byobu/.dirs:   - fix breakage when $TMUX is
 undefined

---
 debian/changelog    | 2 ++
 usr/lib/byobu/.dirs | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/debian/changelog b/debian/changelog
index 4582cea0..c1742374 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,8 @@ byobu (4.31) unreleased; urgency=low
     - fix bold color printing
   * usr/bin/byobu-janitor, usr/share/byobu/profiles/common:
     - deprecate backticks file, no longer needed
+  * usr/lib/byobu/.dirs:
+    - fix breakage when $TMUX is undefined
 
  -- Dustin Kirkland <kirkland@ubuntu.com>  Sun, 21 Aug 2011 21:12:43 -0700
 
diff --git a/usr/lib/byobu/.dirs b/usr/lib/byobu/.dirs
index 8964c790..646a3bee 100755
--- a/usr/lib/byobu/.dirs
+++ b/usr/lib/byobu/.dirs
@@ -44,7 +44,7 @@ if [ -d "$XDG_CACHE_HOME" ]; then
 elif [ -d "$SOCKETDIR/S-$USER" ]; then
 	# But for FAR better performance, use a tmpfs if available
 	export BYOBU_RUN_DIR="$SOCKETDIR/S-$USER/$PKG"
-elif [ -d "$(dirname $TMUX)" ]; then
+elif [ -n "$TMUX" ] && [ -d "$(dirname $TMUX)" ]; then
 	# Or perhaps try the tmux tmpdir
 	export BYOBU_RUN_DIR="$(dirname $TMUX)/$PKG"
 else