[project @ Arch-1:robey@lag.net--2003-public%secsh--dev--1.0--patch-150]

when combining stderr with stdout on a channel, merge the buffers too
when turning on combine-stderr mode on a channel, grab the channel lock and
feed any existing stderr buffer into the normal buffer.  this should help
applications (and my unit tests) avoid races between data coming in over
stderr and setting combine-stderr.

_send_eof is now slightly safer too, although i don't think that really fixed
anything.  it just makes me feel better.

paramiko/channel.py

@@ -371,8 +371,19 @@ class Channel (object):
         
         @since: 1.1
         """
-        old = self.combine_stderr
-        self.combine_stderr = combine
+        data = ''
+        self.lock.acquire()
+        try:
+            old = self.combine_stderr
+            self.combine_stderr = combine
+            if combine and not old:
+                # copy old stderr buffer into primary buffer
+                data = self.in_stderr_buffer
+                self.in_stderr_buffer = ''
+        finally:
+            self.lock.release()
+        if len(data) > 0:
+            self._feed(data)
         return old
 
     
@@ -762,8 +773,8 @@ class Channel (object):
         used to simulate an open FD, but I haven't figured out how to make
         pipes enter non-blocking mode on Windows yet.
         """
+        self.lock.acquire()
         try:
-            self.lock.acquire()
             if self.pipe_rfd != None:
                 return self.pipe_rfd
             # create the pipe and feed in any existing data
@@ -793,7 +804,11 @@ class Channel (object):
             # feign "read" shutdown
             self.eof_received = 1
         if (how == 1) or (how == 2):
-            self._send_eof()
+            self.lock.acquire()
+            try:
+                self._send_eof()
+            finally:
+                self.lock.release()
     
     def shutdown_read(self):
         """
@@ -963,7 +978,7 @@ class Channel (object):
         self.lock.acquire()
         try:
             if not self.eof_received:
-                self.eof_received = 1
+                self.eof_received = True
                 self.in_buffer_cv.notifyAll()
                 self.in_stderr_buffer_cv.notifyAll()
                 if self.pipe_wfd != None:
@@ -999,13 +1014,14 @@ class Channel (object):
         self.out_buffer_cv.notifyAll()
 
     def _send_eof(self):
+        # you are holding the lock.
         if self.eof_sent:
             return
         m = Message()
         m.add_byte(chr(MSG_CHANNEL_EOF))
         m.add_int(self.remote_chanid)
         self.transport._send_user_message(m)
-        self.eof_sent = 1
+        self.eof_sent = True
         self._log(DEBUG, 'EOF sent')
         return