Fix listDirectory.

pym/cl_utils.py

@@ -767,16 +767,26 @@ def getFilesCount(directory):
                           os.walk(directory)),[]))
     return 0
 
-def listDirectory(directory):
+def listDirectory(directory,findCycle=None):
     """Get files from directory, if it exists"""
-    if os.path.exists(directory) and \
-        os.access(directory,os.R_OK) and \
-        (stat.S_ISDIR(os.lstat(directory)[stat.ST_MODE]) or
-         (stat.S_ISLNK(os.lstat(directory)[stat.ST_MODE]) and
-          stat.S_ISDIR(os.lstat(os.readlink(directory))[stat.ST_MODE]))):
-        return os.listdir(directory)
-    else:
-        return []
+    try:
+        if os.path.exists(directory) and \
+            os.access(directory,os.R_OK) and \
+            stat.S_ISDIR(os.lstat(directory)[stat.ST_MODE]):
+            return os.listdir(directory)
+        elif stat.S_ISLNK(os.lstat(directory)[stat.ST_MODE]):
+            realfile = os.path.join(os.path.dirname(directory),
+                    os.readlink(directory))
+            if not findCycle:
+                findCycle = [directory]
+            else:
+                if realfile in findCycle:
+                    return []
+                findCycle.append(directory)
+            return listDirectory(realfile,findCycle)
+    except OSError:
+            pass
+    return []
 
 def detectDeviceForPartition(dev):
     """Detect parent device for partition by /sys/block (sysfs)"""