Add a patch for python eventlet, when using install_venv.py (see FAQ # 1485)

tools/eventlet-patch

@@ -0,0 +1,24 @@
+# HG changeset patch
+# User Soren Hansen <soren@linux2go.dk>
+# Date 1297678255 -3600
+# Node ID 4c846d555010bb5a91ab4da78dfe596451313742
+# Parent  5b7e9946c79f005c028eb63207cf5eb7bb21d1c3
+Don't attempt to wrap GreenPipes in GreenPipe
+
+If the os module is monkeypatched, Python's standard subprocess module
+will return greenio.GreenPipe instances for Popen objects' stdin, stdout,
+and stderr attributes. However, eventlet.green.subprocess tries to wrap
+these attributes in another greenio.GreenPipe, which GreenPipe refuses.
+
+diff -r 5b7e9946c79f -r 4c846d555010 eventlet/green/subprocess.py
+--- a/eventlet/green/subprocess.py	Sat Feb 05 13:05:05 2011 -0800
++++ b/eventlet/green/subprocess.py	Mon Feb 14 11:10:55 2011 +0100
+@@ -27,7 +27,7 @@
+             # eventlet.processes.Process.run() method.
+             for attr in "stdin", "stdout", "stderr":
+                 pipe = getattr(self, attr)
+-                if pipe is not None:
++                if pipe is not None and not type(pipe) == greenio.GreenPipe:
+                     wrapped_pipe = greenio.GreenPipe(pipe, pipe.mode, bufsize)
+                     setattr(self, attr, wrapped_pipe)
+         __init__.__doc__ = subprocess_orig.Popen.__init__.__doc__

tools/install_venv.py

@@ -103,6 +103,12 @@ def install_dependencies(venv=VENV):
   pthfile = os.path.join(venv, "lib", "python2.6", "site-packages", "nova.pth")
   f = open(pthfile, 'w')
   f.write("%s\n" % ROOT)
+  # Patch eventlet (see FAQ # 1485)
+  patchsrc = os.path.join(ROOT, 'tools', 'eventlet-patch')
+  patchfile = os.path.join(venv, "lib", "python2.6", "site-packages", "eventlet",
+                          "green", "subprocess.py")
+  patch_cmd = "patch %s %s" % (patchfile, patchsrc)
+  os.system(patch_cmd)
 
 
 def print_help():