sys.stdout.flush() crashes when closed

[anarcat]

if bup is called somewhat with a weird stdout, for example if redirected to /dev/null (iirc), it will crash with:

19:31 <anarcat>     sys.stdout.flush()
19:31 <anarcat> IOError: [Errno 9] Bad file descriptor
19:31 <anarcat>   File "/usr/lib/bup/cmd/bup-index", line 89, in update_index

this is of course related to #2.

here's a workaround:

diff --git a/cmd/index-cmd.py b/cmd/index-cmd.py
index b7fe8f1..3eedb31 100755
--- a/cmd/index-cmd.py
+++ b/cmd/index-cmd.py
@@ -87,7 +87,11 @@ def hashgen(name):
                                                  exclude_rxs=exclude_rxs):
         if opt.verbose>=2 or (opt.verbose==1 and stat.S_ISDIR(pst.st_mode)):
             sys.stdout.write('%s\n' % path)
-            sys.stdout.flush()
+            try:
+                sys.stdout.flush()
+            except IOError:
+               # probably stdout is closed, ignore
+               pass
             elapsed = time.time() - index_start
             paths_per_sec = total / elapsed if elapsed else 0
             qprogress('Indexing: %d (%d paths/s)\r' % (total, paths_per_sec))