#!/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 sys import yaml def parse_opts(argv): parser = argparse.ArgumentParser( description='Convert to new NIC config templates with ' 'OS::Heat::Value resources.') parser.add_argument('-t', '--template', metavar='TEMPLATE_FILE', help=("Existing NIC config template to conver."), required=True) 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 def to_commented_yaml(filename): """Convert comments into 'comments: ...' 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 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 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='>') class TemplateLoader(yaml.SafeLoader): def construct_mapping(self, node): self.flatten_mapping(node) return collections.OrderedDict(self.construct_pairs(node)) TemplateDumper.add_representer(str, TemplateDumper.description_presenter) TemplateDumper.add_representer(bytes, TemplateDumper.description_presenter) TemplateDumper.add_representer(collections.OrderedDict, TemplateDumper.represent_ordered_dict) TemplateLoader.add_constructor(yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, TemplateLoader.construct_mapping) def write_template(template, filename=None): with open(filename, 'w') as f: yaml.dump(template, f, TemplateDumper, width=120, default_flow_style=False) def validate_template(template): if not os.path.exists(template): raise RuntimeError('Template not provided.') if not os.path.isfile(template): raise RuntimeError('Template %s is not a file.') pass def backup_template(template): extension = datetime.datetime.now().strftime('%Y%m%d%H%M%S') backup_filename = os.path.realpath(template) + '.' + extension if os.path.exists(backup_filename): raise RuntimeError('Backupe file: %s already exists. Aborting!' % backup_filename) shutil.copyfile(template, backup_filename) print('The original template was saved as: %s' % backup_filename) def needs_conversion(): with open(OPTS.template, 'r') as f: template = yaml.load(f.read(), Loader=TemplateLoader) net_config_res = template['resources'].get('OsNetConfigImpl') if (net_config_res and net_config_res[ 'type'] == 'OS::Heat::SoftwareConfig'): backup_template(OPTS.template) if not OPTS.discard_comments: # Convert comments '# ...' into 'comments: ...' # is not lost when loading the data. to_commented_yaml(OPTS.template) return True return False def convert_to_heat_value_resource(): if needs_conversion(): with open(OPTS.template, 'r') as f: template = yaml.load(f.read(), Loader=TemplateLoader) net_config_res = template['resources']['OsNetConfigImpl'] net_config_res_props = net_config_res['properties'] # set the type to OS::Heat::Value net_config_res['type'] = 'OS::Heat::Value' del net_config_res_props['group'] old_config = net_config_res_props['config'] new_config = old_config['str_replace']['params']['$network_config'] del net_config_res_props['config'] net_config_res_props['value'] = new_config outputs = template['outputs'] del outputs['OS::stack_id'] outputs['config'] = {} outputs['config']['value'] = 'get_attr[OsNetConfigImpl, value]' write_template(template, filename=OPTS.template) if not OPTS.discard_comments: # Convert previously converted comments, 'comments: ...' # YAML back to normal #commented YAML to_normal_yaml(OPTS.template) print('The update template was saved as: %s' % OPTS.template) else: print('Template does not need conversion: %s' % OPTS.template) OPTS = parse_opts(sys.argv) convert_to_heat_value_resource()