Add warning message if pyxattr is below version 0.2.2.

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@958 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/CHANGELOG

 New in v1.2.3 (????/??/??)
 ---------------------------
 
+Add warning message if pyxattr is below version 0.2.2. (Andrew Ferguson)
+
 Add "Stale NFS file handle" (ESTALE) to the list of recoverable errors. Thanks
 to Guillaume Vachon for reporting the issue. (Andrew Ferguson)
 

trunk/rdiff-backup/rdiff_backup/fs_abilities.py

@@ -363,6 +363,16 @@ class FSAbilities:
 			self.eas = 0
 			return
 
+		try:
+			ver = xattr.__version__
+		except AttributeError:
+			ver = 'unknown'
+		if ver < '0.2.2' or ver == 'unknown':
+			log.Log("Warning: Your version of pyxattr (%s) has broken support "
+					"for extended\nattributes on symlinks. If you choose not "
+					"to upgrade to a more recent version,\nyou may see many "
+					"warning messages from listattr().\n" % (ver,), 3)
+
 		try:
 			xattr.listxattr(rp.path)
 			if write: