Do not raise exception when path already exists

Isi sdk will report error when the path to create already exists.
This change is to cache the error and not raise an exception.

src/isilon_hadoop_tools/directories.py

@@ -6,9 +6,9 @@
 import logging
 import posixpath
 
+import isilon_hadoop_tools.onefs
 from isilon_hadoop_tools import IsilonHadoopToolError
 
-
 __all__ = [
     # Exceptions
     'DirectoriesError',
@@ -62,7 +62,13 @@ def create_directories(self, directories, setup=None, mkdir=None, chmod=None, ch
         for directory in directories:
             path = posixpath.join(zone_hdfs, directory.path.lstrip(posixpath.sep))
             LOGGER.info("mkdir '%s%s'", zone_root, path)
-            (mkdir or self.onefs.mkdir)(path, directory.mode, zone=self.onefs_zone)
+            try:
+                (mkdir or self.onefs.mkdir)(path, directory.mode, zone=self.onefs_zone)
+            except isilon_hadoop_tools.onefs.APIError as exc:
+                if exc.dir_path_already_exists_error():
+                    LOGGER.warning("%s%s already exists. ", zone_root, path)
+                else:
+                    raise
             LOGGER.info("chmod '%o' '%s%s'", directory.mode, zone_root, path)
             (chmod or self.onefs.chmod)(path, directory.mode, zone=self.onefs_zone)
             LOGGER.info("chown '%s:%s' '%s%s'", directory.owner, directory.group, zone_root, path)

src/isilon_hadoop_tools/onefs.py

@@ -288,6 +288,8 @@ class APIError(_BaseAPIError):
     user_not_found_error_format = "Failed to find user for 'USER:{0}': No such user"
     user_unresolvable_error_format = "Could not resolve user {0}"
     zone_not_found_error_format = 'Access Zone "{0}" not found.'
+    dir_path_already_exists_error_format = \
+        'Unable to create directory as requested -- container already exists'
     # pylint: enable=invalid-name
 
     def __str__(self):
@@ -459,6 +461,14 @@ def zone_not_found_error(self, zone_name):
             )
         )
 
+    def dir_path_already_exists_error(self):
+        """Returns True if the exception contains a directory path already exist error."""
+        return any(
+            self.filtered_errors(
+                lambda error: error['message'] == self.dir_path_already_exists_error_format,
+            )
+        )
+
 
 class MissingLicenseError(OneFSError):
     """This Exception is raised when a license that is expected to exist cannot be found."""