Changes the run_tests.sh and /tools/install_venv.py scripts to be

more user-friendly and not depend on PIP while not in the virtual
environment.

tools/install_venv.py

@@ -1,3 +1,23 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2010 United States Government as represented by the
+# Administrator of the National Aeronautics and Space Administration.
+# All Rights Reserved.
+#
+# Copyright 2010 OpenStack, LLC
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
 """
 Installation script for Nova's development virtualenv
 """
@@ -12,15 +32,15 @@ VENV = os.path.join(ROOT, '.nova-venv')
 PIP_REQUIRES = os.path.join(ROOT, 'tools', 'pip-requires')
 TWISTED_NOVA='http://nova.openstack.org/Twisted-10.0.0Nova.tar.gz'
 
-
 def die(message, *args):
   print >>sys.stderr, message % args
   sys.exit(1)
 
 
 def run_command(cmd, redirect_output=True, error_ok=False):
-  # Useful for debugging:
-  #print >>sys.stderr, ' '.join(cmd)
+  """Runs a command in an out-of-process shell, returning the
+  output of that command
+  """
   if redirect_output:
     stdout = subprocess.PIPE
   else:
@@ -33,32 +53,44 @@ def run_command(cmd, redirect_output=True, error_ok=False):
   return output
 
 
+HAS_EASY_INSTALL = bool(run_command(['which', 'easy_install']).strip())
+HAS_VIRTUALENV = bool(run_command(['which', 'virtualenv']).strip())
+
+
 def check_dependencies():
-  """Make sure pip and virtualenv are on the path."""
-  print 'Checking for pip...',
-  if not run_command(['which', 'pip']).strip():
-    die('ERROR: pip not found.\n\nNova development requires pip,'
-        ' please install it using your favorite package management tool')
-  print 'done.'
+  """Make sure virtualenv is in the path."""
 
   print 'Checking for virtualenv...',
-  if not run_command(['which', 'virtualenv']).strip():
-    die('ERROR: virtualenv not found.\n\nNova development requires virtualenv,'
-        ' please install it using your favorite package management tool')
+  if not HAS_VIRTUALENV:
+    print 'not found.'
+    # Try installing it via easy_install...
+    if HAS_EASY_INSTALL:
+      print 'Installing virtualenv via easy_install...',
+      if not run_command(['which', 'easy_install']):
+        die('ERROR: virtualenv not found.\n\nNova development requires virtualenv,'
+            ' please install it using your favorite package management tool')
+      print 'done.'
   print 'done.'
 
 
 def create_virtualenv(venv=VENV):
+  """Creates the virtual environment and installs PIP only into the
+  virtual environment
+  """
   print 'Creating venv...',
   run_command(['virtualenv', '-q', '--no-site-packages', VENV])
   print 'done.'
+  print 'Installing pip in virtualenv...',
+  if not run_command(['tools/with_venv.sh', 'easy_install', 'pip']).strip():
+    die("Failed to install pip.")
+  print 'done.'
 
 
 def install_dependencies(venv=VENV):
   print 'Installing dependencies with pip (this can take a while)...'
-  run_command(['pip', 'install', '-E', venv, '-r', PIP_REQUIRES],
+  run_command(['tools/with_venv.sh', 'pip', 'install', '-E', venv, '-r', PIP_REQUIRES],
               redirect_output=False)
-  run_command(['pip', 'install', '-E', venv, TWISTED_NOVA],
+  run_command(['tools/with_venv.sh', 'pip', 'install', '-E', venv, TWISTED_NOVA],
               redirect_output=False)