[PATCH] gitk: catch mkdtemp errors

[David Aguilar <davvid@gmail.com>]

105b5d3fbb1c00bb0aeaf9d3e0fbe26a7b1993fc introduced a dependency
on mkdtemp, which is not available on Windows.

Use the original temporary directory behavior when mkdtemp fails.
This makes the code use mkdtemp when available and gracefully
fallback to the existing behavior when it is not available.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: David Aguilar <davvid@gmail.com>
---
 gitk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gitk b/gitk
index 41e5071..9237830 100755
--- a/gitk
+++ b/gitk
@@ -3504,7 +3504,9 @@ proc gitknewtmpdir {} {
 	    set tmpdir $gitdir
 	}
 	set gitktmpformat [file join $tmpdir ".gitk-tmp.XXXXXX"]
-	set gitktmpdir [exec mktemp -d $gitktmpformat]
+	if {[catch {set gitktmpdir [exec mktemp -d $gitktmpformat]}]} {
+	    set gitktmpdir [file join $gitdir [format ".gitk-tmp.%s" [pid]]]
+	}
 	if {[catch {file mkdir $gitktmpdir} err]} {
 	    error_popup "[mc "Error creating temporary directory %s:" $gitktmpdir] $err"
 	    unset gitktmpdir
-- 
2.0.0.257.g75cc6c6