[Python-checkins] r83084 - in python/branches/release31-maint: Lib/platform.py Lib/test/test_platform.py Misc/NEWS

ronald.oussoren python-checkins at python.org
Fri Jul 23 14:36:59 CEST 2010


Author: ronald.oussoren
Date: Fri Jul 23 14:36:59 2010
New Revision: 83084

Log:
Merged revisions 83075 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r83075 | ronald.oussoren | 2010-07-23 12:54:59 +0100 (Fri, 23 Jul 2010) | 5 lines
  
  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.
........


Modified:
   python/branches/release31-maint/   (props changed)
   python/branches/release31-maint/Lib/platform.py
   python/branches/release31-maint/Lib/test/test_platform.py
   python/branches/release31-maint/Misc/NEWS

Modified: python/branches/release31-maint/Lib/platform.py
==============================================================================
--- python/branches/release31-maint/Lib/platform.py	(original)
+++ python/branches/release31-maint/Lib/platform.py	Fri Jul 23 14:36:59 2010
@@ -696,27 +696,19 @@
 
     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
@@ -740,6 +732,53 @@
         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):

Modified: python/branches/release31-maint/Lib/test/test_platform.py
==============================================================================
--- python/branches/release31-maint/Lib/test/test_platform.py	(original)
+++ python/branches/release31-maint/Lib/test/test_platform.py	Fri Jul 23 14:36:59 2010
@@ -167,6 +167,25 @@
             else:
                 self.assertEquals(res[2], 'PowerPC')
 
+
+    @unittest.skipUnless(sys.platform == 'darwin', "OSX only test")
+    def test_mac_ver_with_fork(self):
+        # Issue7895: platform.mac_ver() crashes when using fork without exec
+        #
+        # This test checks that the fix for that issue works.
+        #
+        pid = os.fork()
+        if pid == 0:
+            # child
+            info = platform.mac_ver()
+            os._exit(0)
+
+        else:
+            # parent
+            cpid, sts = os.waitpid(pid, 0)
+            self.assertEquals(cpid, pid)
+            self.assertEquals(sts, 0)
+
     def test_dist(self):
         res = platform.dist()
 

Modified: python/branches/release31-maint/Misc/NEWS
==============================================================================
--- python/branches/release31-maint/Misc/NEWS	(original)
+++ python/branches/release31-maint/Misc/NEWS	Fri Jul 23 14:36:59 2010
@@ -78,6 +78,8 @@
 Library
 -------
 
+- Issue #7895: platform.mac_ver() no longer crashes after calling os.fork()
+
 - Issue #9323: Fixed a bug in trace.py that resulted in loosing the
   name of the script being traced.  Patch by Eli Bendersky.
 


More information about the Python-checkins mailing list