Merged revisions 85386-85387,85389 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r85386 | victor.stinner | 2010-10-13 00:23:23 +0200 (mer., 13 oct. 2010) | 3 lines

  Issue #6612: Fix site and sysconfig to catch os.getcwd() error, eg. if the
  current directory was deleted.
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  r85387 | victor.stinner | 2010-10-13 00:26:08 +0200 (mer., 13 oct. 2010) | 2 lines

  #6612: add the author of the patch (W. Trevor King)
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  r85389 | victor.stinner | 2010-10-13 00:42:37 +0200 (mer., 13 oct. 2010) | 2 lines

  NEWS: Move #6612 to Library section
........

1 files changed, 18 insertions, 7 deletions

diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
index b8880f5355..5d5d5c0100 100644
--- a/Lib/sysconfig.py
+++ b/Lib/sysconfig.py
@@ -93,21 +93,28 @@ _PREFIX = os.path.normpath(sys.prefix)
 _EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
 _CONFIG_VARS = None
 _USER_BASE = None
+
+def _safe_realpath(path):
+    try:
+        return realpath(path)
+    except OSError:
+        return path
+
 if sys.executable:
-    _PROJECT_BASE = os.path.dirname(realpath(sys.executable))
+    _PROJECT_BASE = os.path.dirname(_safe_realpath(sys.executable))
 else:
     # sys.executable can be empty if argv[0] has been changed and Python is
     # unable to retrieve the real program name
-    _PROJECT_BASE = realpath(os.getcwd())
+    _PROJECT_BASE = _safe_realpath(os.getcwd())
 
 if os.name == "nt" and "pcbuild" in _PROJECT_BASE[-8:].lower():
-    _PROJECT_BASE = realpath(os.path.join(_PROJECT_BASE, pardir))
+    _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir))
 # PC/VS7.1
 if os.name == "nt" and "\\pc\\v" in _PROJECT_BASE[-10:].lower():
-    _PROJECT_BASE = realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
+    _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
 # PC/AMD64
 if os.name == "nt" and "\\pcbuild\\amd64" in _PROJECT_BASE[-14:].lower():
-    _PROJECT_BASE = realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
+    _PROJECT_BASE = _safe_realpath(os.path.join(_PROJECT_BASE, pardir, pardir))
 
 def is_python_build():
     for fn in ("Setup.dist", "Setup.local"):
@@ -319,7 +326,7 @@ def _init_non_posix(vars):
     vars['SO'] = '.pyd'
     vars['EXE'] = '.exe'
     vars['VERSION'] = _PY_VERSION_SHORT_NO_DOT
-    vars['BINDIR'] = os.path.dirname(realpath(sys.executable))
+    vars['BINDIR'] = os.path.dirname(_safe_realpath(sys.executable))
 
 #
 # public APIs
@@ -439,8 +446,12 @@ def get_config_vars(*args):
         # from a different directory.
         if _PYTHON_BUILD and os.name == "posix":
             base = _PROJECT_BASE
+            try:
+                cwd = os.getcwd()
+            except OSError:
+                cwd = None
             if (not os.path.isabs(_CONFIG_VARS['srcdir']) and
-                base != os.getcwd()):
+                base != cwd):
                 # srcdir is relative and we are not in the same directory
                 # as the executable. Assume executable is in the build
                 # directory and make srcdir absolute.