Merge branch 'develop' into mplegendre-multi_pkgsrc_roots

Conflicts:
	lib/spack/spack/cmd/create.py
	lib/spack/spack/cmd/extensions.py
	lib/spack/spack/cmd/fetch.py
	lib/spack/spack/cmd/uninstall.py
	lib/spack/spack/config.py
	lib/spack/spack/database.py
	lib/spack/spack/directory_layout.py
	lib/spack/spack/packages.py
	lib/spack/spack/spec.py

bin/spack

@@ -7,7 +7,7 @@
 # Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
 # LLNL-CODE-647188
 #
-# For details, see https://scalability-llnl.github.io/spack
+# For details, see https://github.com/llnl/spack
 # Please also see the LICENSE file for our notice and the LGPL.
 #
 # This program is free software; you can redistribute it and/or modify
@@ -38,6 +38,23 @@ SPACK_PREFIX = os.path.dirname(os.path.dirname(SPACK_FILE))
 # Allow spack libs to be imported in our scripts
 SPACK_LIB_PATH = os.path.join(SPACK_PREFIX, "lib", "spack")
 sys.path.insert(0, SPACK_LIB_PATH)
+SPACK_EXTERNAL_LIBS = os.path.join(SPACK_LIB_PATH, "external")
+sys.path.insert(0, SPACK_EXTERNAL_LIBS)
+
+# Quick and dirty check to clean orphaned .pyc files left over from
+# previous revisions.  These files were present in earlier versions of
+# Spack, were removed, but shadow system modules that Spack still
+# imports.  If we leave them, Spack will fail in mysterious ways.
+# TODO: more elegant solution for orphaned pyc files.
+orphaned_pyc_files = [os.path.join(SPACK_EXTERNAL_LIBS, n)
+                      for n in ('functools.pyc', 'ordereddict.pyc')]
+for pyc_file in orphaned_pyc_files:
+    if not os.path.exists(pyc_file):
+        continue
+    try:
+        os.remove(pyc_file)
+    except OSError as e:
+        print "WARNING: Spack may fail mysteriously. Couldn't remove orphaned .pyc file: %s" % pyc
 
 # If there is no working directory, use the spack prefix.
 try:
@@ -72,6 +89,8 @@ spec expressions:
 
 parser.add_argument('-d', '--debug', action='store_true',
                     help="Write out debug logs during compile")
+parser.add_argument('-D', '--pdb', action='store_true',
+                    help="Run spack under the pdb debugger")
 parser.add_argument('-k', '--insecure', action='store_true',
                     help="Do not check ssl certificates when downloading.")
 parser.add_argument('-m', '--mock', action='store_true',
@@ -131,7 +150,7 @@ def main():
         sys.stderr.write('\n')
         tty.die("Keyboard interrupt.")
 
-    # Allow commands to return values if they want to exit with some ohter code.
+    # Allow commands to return values if they want to exit with some other code.
     if return_val is None:
         sys.exit(0)
     elif isinstance(return_val, int):
@@ -142,5 +161,8 @@ def main():
 if args.profile:
     import cProfile
     cProfile.run('main()', sort='tottime')
+elif args.pdb:
+    import pdb
+    pdb.run('main()')
 else:
     main()