Adjust for the fact that Python 2.5 doesn't have collections.MutableSet.

[invirt/packages/python-afs.git] / afs / pts.py

diff --git a/afs/pts.py b/afs/pts.py
index cfbfb7d..f99bc8f 100644 (file)
--- a/afs/pts.py
+++ b/afs/pts.py
@@ -1,7 +1,12 @@
 import collections
-import _pts
+from afs import _pts
 
-class PTRelationSet(collections.MutableSet):
+try:
+    SetMixin = collections.MutableSet
+except AttributeError:
+    SetMixin = object
+
+class PTRelationSet(SetMixin):
     """Collection class for the groups/members of a PTEntry.
 
     This class, which acts like a set, is actually a view of the
@@ -45,7 +50,8 @@ class PTRelationSet(collections.MutableSet):
         Args:
             elt: The element to add.
         """
-        self._set.add(self._ent._pts.getEntry(elt))
+        if hasattr(self, '_set'):
+            self._set.add(self._ent._pts.getEntry(elt))
 
     def _discard(self, elt):
         """Remove a PTEntry to this instance's internal representation.
@@ -57,7 +63,8 @@ class PTRelationSet(collections.MutableSet):
         Args:
             elt: The element to discard.
         """
-        self._set.discard(self._ent._pts.getEntry(elt))
+        if hasattr(self, '_set'):
+            self._set.discard(self._ent._pts.getEntry(elt))
 
     def __len__(self):
         """Count the members/groups in this set.
@@ -165,6 +172,16 @@ class PTRelationSet(collections.MutableSet):
 
         self._discard(elt)
 
+    def remove(self, elt):
+        """Remove an entity from a group; it must already be a member.
+
+        If the entity is not a member, raise a KeyError.
+        """
+        if elt not in self:
+            raise KeyError(elt)
+
+        self.discard(elt)
+
 
 class PTEntry(object):
     """An entry in the AFS protection database.
@@ -248,6 +265,12 @@ class PTEntry(object):
         self._name = val
     name = property(_get_name, _set_name)
 
+    def _get_krbname(self):
+        return self._pts._AfsToKrb5(self.name)
+    def _set_krbname(self, val):
+        self.name = self._pts._Krb5ToAfs(val)
+    krbname = property(_get_krbname, _set_krbname)
+
     def _get_count(self):
         self._loadEntry()
         return self._count
@@ -354,6 +377,14 @@ class PTS(_pts.PTS):
         else:
             return PTEntry(self, id=ident)
 
+    def getEntryFromKrbname(self, ident):
+        """Retrieve a PTEntry matching a given Kerberos v5 principal.
+
+        getEntryFromKrb accepts a krb5 principal, converts it to the
+        equivalent AFS principal, and returns a PTEntry for that
+        principal."""
+        return self.getEntry(self._Krb5ToAfs(ident))
+
     def expire(self):
         """Flush the cache of PTEntry objects.