From e186e384f4fb11158b448d94f37aaf2a3ed6b45e Mon Sep 17 00:00:00 2001
From: Ronald Oussoren <ronaldoussoren@mac.com>
Date: Fri, 23 Jul 2010 11:54:59 +0000
Subject: Fix for issue 7895. Avoid crashing the interpreter when calling
 platform.mac_ver after calling os.fork by reading from a system configuration
 file instead of using OSX APIs.

---
 Lib/platform.py | 61 ++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 50 insertions(+), 11 deletions(-)

(limited to 'Lib/platform.py')

diff --git a/Lib/platform.py b/Lib/platform.py
index 0aa6afe5cc..75f92af006 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -724,27 +724,19 @@ def _bcd2str(bcd):
 
     return hex(bcd)[2:]
 
-def mac_ver(release='',versioninfo=('','',''),machine=''):
-
-    """ Get MacOS version information and return it as tuple (release,
-        versioninfo, machine) with versioninfo being a tuple (version,
-        dev_stage, non_release_version).
-
-        Entries which cannot be determined are set to the paramter values
-        which default to ''. All tuple entries are strings.
-
+def _mac_ver_gestalt():
+    """
         Thanks to Mark R. Levinson for mailing documentation links and
         code examples for this function. Documentation for the
         gestalt() API is available online at:
 
            http://www.rgaros.nl/gestalt/
-
     """
     # Check whether the version info module is available
     try:
         import _gestalt
     except ImportError:
-        return release,versioninfo,machine
+        return None
     # Get the infos
     sysv, sysa = _mac_ver_lookup(('sysv','sysa'))
     # Decode the infos
@@ -768,6 +760,53 @@ def mac_ver(release='',versioninfo=('','',''),machine=''):
         machine = {0x1: '68k',
                    0x2: 'PowerPC',
                    0xa: 'i386'}.get(sysa,'')
+
+    return release,versioninfo,machine
+
+def _mac_ver_xml():
+    fn = '/System/Library/CoreServices/SystemVersion.plist'
+    if not os.path.exists(fn):
+        return None
+
+    try:
+        import plistlib
+    except ImportError:
+        return None
+
+    pl = plistlib.readPlist(fn)
+    release = pl['ProductVersion']
+    versioninfo=('', '', '')
+    machine = os.uname()[4]
+    if machine == 'ppc':
+        # for compatibility with the gestalt based code
+        machine = 'PowerPC'
+
+    return release,versioninfo,machine
+
+
+def mac_ver(release='',versioninfo=('','',''),machine=''):
+
+    """ Get MacOS version information and return it as tuple (release,
+        versioninfo, machine) with versioninfo being a tuple (version,
+        dev_stage, non_release_version).
+
+        Entries which cannot be determined are set to the paramter values
+        which default to ''. All tuple entries are strings.
+    """
+
+    # First try reading the information from an XML file which should
+    # always be present
+    info = _mac_ver_xml()
+    if info is not None:
+        return info
+
+    # If that doesn't work for some reason fall back to reading the
+    # information using gestalt calls.
+    info = _mac_ver_gestalt()
+    if info is not None:
+        return info
+
+    # If that also doesn't work return the default values
     return release,versioninfo,machine
 
 def _java_getprop(name,default):
-- 
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