Add data validation tool

Simple command line tool to check data intended to bareon. It uses data
validation API provided by data-drivers in same manner as data-drivers
do during "regular" call of bareon.

Change-Id: I2a8950178839c13d8ebcc72cacba203b4bfe37c5

bareon/cmd/validator.py

@@ -0,0 +1,83 @@
+#    Copyright 2016 Mirantis, Inc.
+#    Copyright 2016 Cray Inc.  All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import json
+import sys
+
+from oslo.config import cfg
+
+from bareon import errors
+from bareon.utils import utils
+from bareon import version
+
+
+cli_opts = [
+    cfg.StrOpt(
+        'data_driver', default='ironic',
+        help='Data driver'
+    ),
+    cfg.StrOpt(
+        'input_data_file', positional=True, default='-',
+        help='Path to deployment config'
+    )
+]
+
+CONF = cfg.ConfigOpts()
+
+
+def worker():
+    CONF.register_cli_opts(cli_opts)
+    CONF(sys.argv[1:], project='fuel-agent',
+         version=version.version_info.release_string())
+
+    stream = None
+    try:
+        if CONF.input_data_file == '-':
+            stream = sys.stdin
+        else:
+            stream = open(CONF.input_data_file, 'rt')
+        data = json.load(stream)
+        stream.close()
+    except IOError as e:
+        raise OperationFailed('Unable to read input data {!r}: {} - {}'.format(
+            stream, e.filename, e))
+    except (TypeError, ValueError) as e:
+        raise OperationFailed('Unable to decode input data: {}'.format(e))
+
+    cls = utils.get_data_driver(CONF.data_driver)
+    try:
+        cls.validate_data(data)
+    except errors.WrongInputDataError as e:
+        message = [
+            'Validation failure\n\n',
+            e.message]
+        raise OperationFailed(''.join(message))
+
+
+def main():
+    try:
+        worker()
+    except OperationFailed as e:
+        sys.stderr.write('{}'.format(e))
+        sys.stderr.write('\n')
+        return 1
+
+
+class OperationFailed(Exception):
+    pass
+
+
+if __name__ == '__main__':
+    sys.exit(main())

bareon/drivers/data/base.py

@@ -20,6 +20,7 @@ import pkg_resources
 import six
 
 import bareon.drivers.data
+import bareon.errors
 
 
 @six.add_metaclass(abc.ABCMeta)
@@ -30,6 +31,10 @@ class BaseDataDriver(object):
     methods for getting object schemes, etc.
     """
 
+    # Can be used by clients outside of bareon package. Client who loads
+    # data-driver via stevedore
+    exc = bareon.errors
+
     data_validation_schema = None
 
     def __init__(self, data):

bareon/errors.py

@@ -31,10 +31,10 @@ class InputDataSchemaValidationError(WrongInputDataError):
     def __init__(self, defects):
         human_readable_defects = []
         for idx, d in enumerate(defects):
-            path = [''] + list(d.path)
+            path = list(d.path)
             path = '/'.join((str(x) for x in path))
             human_readable_defects.append(
-                '#{} ({}): {}'.format(idx, path, d.message))
+                '{:>2} (/{}): {}'.format('#{}'.format(idx), path, d.message))
 
         indent = ' ' * 4
         separator = '\n{}'.format(indent)

setup.cfg

@@ -25,6 +25,7 @@ console_scripts =
     bareon-build-image = bareon.cmd.agent:build_image
     bareon-ironic-callback = bareon.cmd.ironic_callback:main
     bareon-mkbootstrap = bareon.cmd.agent:mkbootstrap
+    bareon-data-validator = bareon.cmd.validator:main
 
 bareon.drivers.data =
     nailgun = bareon.drivers.data.nailgun:Nailgun