Fix the PYTHONPATH bits of bug 436062 in a not-hacky way by using a script which can set up the path and then forward to the real script we're trying to run, r=ted

config/pythonpath.py

@@ -0,0 +1,40 @@
+"""
+Run a python script, adding extra directories to the python path.
+"""
+
+import sys, os
+
+def usage():
+    print >>sys.stderr, "pythonpath.py -I directory script.py [args...]"
+    sys.exit(150)
+
+paths = []
+
+while True:
+    try:
+        arg = sys.argv[1]
+    except IndexError:
+        usage()
+
+    if arg == '-I':
+        del sys.argv[1]
+        try:
+            path = sys.argv.pop(1)
+        except IndexError:
+            usage()
+
+        paths.append(path)
+        continue
+
+    if arg.startswith('-I'):
+        path = sys.argv.pop(1)[2:]
+        paths.append(path)
+        continue
+
+    break
+
+sys.argv.pop(0)
+script = sys.argv[0]
+
+sys.path[0:0] = [os.path.dirname(script)] + paths
+execfile(script, {'__name__': '__main__'})