Heat templates for deploying OpenStack
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#!/usr/bin/env python
# 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 argparse
import collections
import datetime
import os
import re
import shutil
import subprocess
import sys
import yaml
from tempfile import mkdtemp
DEFAULT_THT_DIR = '/usr/share/openstack-tripleo-heat-templates'
NIC_CONFIG_REFERENCE = 'single-nic-vlans'
def parse_opts(argv):
parser = argparse.ArgumentParser(
description='Merge new NIC config template parameters into '
'existing NIC config template.')
parser.add_argument('-r', '--roles-data', metavar='ROLES_DATA',
help="Relative path to the roles_data.yaml file.",
default=('%s/roles_data.yaml') % DEFAULT_THT_DIR)
parser.add_argument('-n', '--network-data', metavar='NETWORK_DATA',
help="Relative path to the network_data.yaml file.",
default=('%s/network_data.yaml') % DEFAULT_THT_DIR)
parser.add_argument('--role-name', metavar='ROLE-NAME',
help="Name of the role the NIC config is used for.",
required=True)
parser.add_argument('-t', '--template', metavar='TEMPLATE_FILE',
help=("Existing NIC config template to merge "
"parameter too."),
required=True)
parser.add_argument('--tht-dir', metavar='THT_DIR',
help=("Path to tripleo-heat-templates (THT) "
"directory"),
default=DEFAULT_THT_DIR)
parser.add_argument('--discard-comments', metavar='DISCARD_COMMENTS',
help="Discard comments from the template. (The "
"scripts functions to keep YAML file comments in "
"place, does not work in all scenarios.)",
default=False)
opts = parser.parse_args(argv[1:])
return opts
# FIXME: This duplicates code from tools/yaml-nic-config-2-script.py, we should
# refactor to share the common code
def to_commented_yaml(filename):
""" Convert comments into 'comments<num>: ...' YAML """
out_str = ''
last_non_comment_spaces = ''
with open(filename, 'r') as f:
comment_count = 0
for line in f:
# skip blank line
if line.isspace():
continue
char_count = 0
spaces = ''
for char in line:
char_count += 1
if char == ' ':
spaces += ' '
next
elif char == '#':
comment_count += 1
comment = line[char_count:-1]
last_non_comment_spaces = spaces
out_str += "%scomment%i_%i: '%s'\n" % (
last_non_comment_spaces, comment_count, len(spaces),
comment)
break
else:
last_non_comment_spaces = spaces
out_str += line
# inline comments check
m = re.match(".*:.*#(.*)", line)
if m:
comment_count += 1
out_str += "%s inline_comment%i: '%s'\n" % (
last_non_comment_spaces, comment_count, m.group(1))
break
with open(filename, 'w') as f:
f.write(out_str)
return out_str
# FIXME: This duplicates code from tools/yaml-nic-config-2-script.py, we should
# refactor to share the common code
def to_normal_yaml(filename):
""" Convert back to normal #commented YAML"""
with open(filename, 'r') as f:
data = f.read()
out_str = ''
next_line_break = False
for line in data.split('\n'):
# get_input not supported by run-os-net-config.sh script
line = line.replace('get_input: ', '')
# Normal comments
m = re.match(" +comment[0-9]+_([0-9]+): '(.*)'.*", line)
# Inline comments
i = re.match(" +inline_comment[0-9]+: '(.*)'.*", line)
if m:
if next_line_break:
out_str += '\n'
next_line_break = False
for x in range(0, int(m.group(1))):
out_str += " "
out_str += "#%s\n" % m.group(2)
elif i:
out_str += " #%s\n" % i.group(1)
next_line_break = False
else:
if next_line_break:
out_str += '\n'
out_str += line
next_line_break = True
if next_line_break:
out_str += '\n'
with open(filename, 'w') as f:
f.write(out_str)
return out_str
# FIXME: Some of this duplicates code from build_endpoint_map.py, we should
# refactor to share the common code
class TemplateDumper(yaml.SafeDumper):
def represent_ordered_dict(self, data):
return self.represent_dict(data.items())
def description_presenter(self, data):
if not len(data) > 80:
return self.represent_scalar('tag:yaml.org,2002:str', data)
return self.represent_scalar('tag:yaml.org,2002:str', data, style='>')
# FIXME: This duplicates code from tools/yaml-nic-config-2-script.py, we should
# refactor to share the common code
# We load mappings into OrderedDict to preserve their order
class TemplateLoader(yaml.SafeLoader):
def construct_mapping(self, node):
self.flatten_mapping(node)
return collections.OrderedDict(self.construct_pairs(node))
if sys.version_info.major >= 3:
TemplateDumper.add_representer(str, TemplateDumper.description_presenter)
TemplateDumper.add_representer(bytes,
TemplateDumper.description_presenter)
else:
TemplateDumper.add_representer(str, TemplateDumper.description_presenter)
TemplateDumper.add_representer(unicode,
TemplateDumper.description_presenter)
TemplateDumper.add_representer(collections.OrderedDict,
TemplateDumper.represent_ordered_dict)
TemplateLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG,
TemplateLoader.construct_mapping)
# FIXME: This duplicates code from tools/yaml-nic-config-2-script.py, we should
# refactor to share the common code
def write_template(template, filename=None):
with open(filename, 'w') as f:
yaml.dump(template, f, TemplateDumper, width=120,
default_flow_style=False)
def process_templates_and_get_reference_parameters():
temp_dir = mkdtemp(dir='/tmp')
executable = OPTS.tht_dir + '/tools/process-templates.py'
cmd = [executable,
'--roles-data ' + OPTS.roles_data,
'--base_path ' + OPTS.tht_dir,
'--network-data ' + OPTS.network_data,
'--output-dir ' + temp_dir]
child = subprocess.Popen(' '.join(cmd), shell=True, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, universal_newlines=True)
out, err = child.communicate()
if not child.returncode == 0:
raise RuntimeError('Error processing templates: %s' % err)
# If deprecated_nic_config_names is set for role the deprecated name must
# be used when loading the reference file.
with open(OPTS.roles_data) as roles_data_file:
roles_data = yaml.safe_load(roles_data_file)
try:
nic_config_name = next((x.get('deprecated_nic_config_name',
OPTS.role_name.lower() + '.yaml')
for x in roles_data
if x['name'] == OPTS.role_name))
except StopIteration:
raise RuntimeError('The role: {role_name} is not defined in roles '
'data file: {roles_data_file}'.format(
role_name=OPTS.role_name, roles_data_file=OPTS.roles_data))
refernce_file = '/'.join([temp_dir, 'network/config', NIC_CONFIG_REFERENCE,
nic_config_name])
with open(refernce_file) as reference:
reference_template = yaml.safe_load(reference)
reference_params = reference_template['parameters']
shutil.rmtree(temp_dir)
return reference_params
def validate_template():
if not os.path.exists(OPTS.template):
raise RuntimeError('Template not provided.')
if not os.path.isfile(OPTS.template):
raise RuntimeError('Template %s is not a file.')
pass
def backup_template():
extension = datetime.datetime.now().strftime('%Y%m%d%H%M%S')
backup_filename = os.path.realpath(OPTS.template) + '.' + extension
if os.path.exists(backup_filename):
raise RuntimeError('Backupe file: %s already exists. Aborting!'
% backup_filename)
shutil.copyfile(OPTS.template, backup_filename)
print('The original template was saved as: %s' % backup_filename)
def merge_from_processed(reference_params):
template = yaml.load(open(OPTS.template).read(), Loader=TemplateLoader)
for param in reference_params:
if param not in template['parameters']:
template['parameters'][param] = reference_params[param]
write_template(template, filename=OPTS.template)
print('The update template was saved as: %s' % OPTS.template)
OPTS = parse_opts(sys.argv)
validate_template()
backup_template()
if not OPTS.discard_comments:
# Convert comments '# ...' into 'comments<num>: ...' YAML so that the info
# is not lost when loading the data.
to_commented_yaml(OPTS.template)
reference_params = process_templates_and_get_reference_parameters()
merge_from_processed(reference_params)
if not OPTS.discard_comments:
# Convert previously converted comments, 'comments<num>: ...' YAML back to
# normal #commented YAML
to_normal_yaml(OPTS.template)