Injects the current sys.path into `lint.py` subprocess env

This allows installing pylint in a buildout setup and *see* the eggs in the
buildout.  Since buildout modifies the installed scripts (like epyling) by
prepending and assignment to ``sys.path[0:0]`` all the eggs, we need to make
sure those path are the ones seen by pylint.

1 files changed, 24 insertions, 3 deletions

diff --git a/epylint.py b/epylint.py
index 24baa61e9..13449b2e4 100755
--- a/epylint.py
+++ b/epylint.py
@@ -83,7 +83,18 @@ def lint(filename, options=None):
     options = options or ['--disable=C,R,I']
     cmd = [sys.executable, lint_path] + options + ['--msg-template',
             '{path}:{line}: [{symbol}, {obj}] {msg}', '-r', 'n', child_path]
-    process = Popen(cmd, stdout=PIPE, cwd=parent_path, universal_newlines=True)
+    # Extracts the environment PYTHONPATH and appends the current sys.path to
+    # those.
+    env = dict(os.environ)
+    pythonpath = env.get('PYTHONPATH', '')
+    currentpaths = os.pathsep.join(sys.path)
+    if pythonpath:
+        pythonpath += os.pathsep + currentpaths
+    else:
+        pythonpath = currentpaths
+    env['PYTHONPATH'] = pythonpath
+    process = Popen(cmd, stdout=PIPE, cwd=parent_path, env=env,
+                    universal_newlines=True)
 
     # The parseable line format is '%(path)s:%(line)s: [%(sigle)s%(obj)s] %(msg)s'
     # NOTE: This would be cleaner if we added an Emacs reporter to pylint.reporters.text ..
@@ -157,9 +168,20 @@ def py_run(command_options='', return_std=False, stdout=None, stderr=None,
             stderr = PIPE
         else:
             stderr = sys.stderr
+    # Extracts the environment PYTHONPATH and appends the current sys.path to
+    # those.
+    env = dict(os.environ)
+    pythonpath = env.get('PYTHONPATH', '')
+    currentpaths = os.pathsep.join(sys.path)
+    if pythonpath:
+        pythonpath += os.pathsep + currentpaths
+    else:
+        pythonpath = currentpaths
+    env['PYTHONPATH'] = pythonpath
+
     # Call pylint in a subprocess
     p = Popen(command_line, shell=True, stdout=stdout, stderr=stderr,
-              universal_newlines=True)
+              env=env, universal_newlines=True)
     p.wait()
     # Return standart output and error
     if return_std:
@@ -179,4 +201,3 @@ def Run():
 
 if __name__ == '__main__':
     Run()
-