updatecheck.fileSystemItemExists(item) now returns true when given a path to a symlink if the symlink exists but the item it points to does not. Previously it returned false if the target was missing.

git-svn-id: http://munki.googlecode.com/svn/trunk@1105 a4e17f2e-e282-11dd-95e1-755cbddbdd66

code/client/munkilib/updatecheck.py

@@ -465,13 +465,15 @@ def filesystemItemExists(item):
                 (or there is no checksum)
     Returns -1 if the filesystem item exists but the checksum does not match.
 
-
+    Broken symlinks are OK; we're testing for the existence of the symlink,
+    not the item it points to.
+    
     Raises munkicommon.Error is there's a problem with the input.
     """
     if 'path' in item:
         filepath = item['path']
         munkicommon.display_debug1('Checking existence of %s...' % filepath)
-        if os.path.exists(filepath):
+        if os.path.lexists(filepath):
             munkicommon.display_debug2('\tExists.')
             if 'md5checksum' in item:
                 storedchecksum = item['md5checksum']