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 jinja2
import os
import shutil
import six
import sys
import yaml
__tht_root_dir = os.path.dirname(os.path.dirname(__file__))
def parse_opts(argv):
parser = argparse.ArgumentParser(
description='Configure host network interfaces using a JSON'
' config file format.')
parser.add_argument('-p', '--base_path', metavar='BASE_PATH',
help="""base path of templates to process.""",
parser.add_argument('-r', '--roles-data', metavar='ROLES_DATA',
help="""relative path to the roles_data.yaml file.""",
help="""Enable safe mode (do not overwrite files).""",
parser.add_argument('-o', '--output-dir', metavar='OUTPUT_DIR',
help="""Output dir for all the templates""",
opts = parser.parse_args(argv[1:])
return opts
def _j2_render_to_file(j2_template, j2_data, outfile_name=None,
yaml_f = outfile_name or j2_template.replace('.j2.yaml', '.yaml')
print('rendering j2 template to file: %s' % outfile_name)
if not overwrite and os.path.exists(outfile_name):
print('ERROR: path already exists for file: %s' % outfile_name)
# Search for templates relative to the current template path first
template_base = os.path.dirname(yaml_f)
j2_loader = jinja2.loaders.FileSystemLoader([template_base, __tht_root_dir])
# Render the j2 template
template = jinja2.Environment(loader=j2_loader).from_string(
r_template = template.render(**j2_data)
except jinja2.exceptions.TemplateError as ex:
error_msg = ("Error rendering template %s : %s"
% (yaml_f, six.text_type(ex)))
raise Exception(error_msg)
with open(outfile_name, 'w') as out_f:
def process_templates(template_path, role_data_path, output_dir, overwrite):
with open(role_data_path) as role_data_file:
role_data = yaml.safe_load(role_data_file)
j2_excludes_path = os.path.join(template_path, 'j2_excludes.yaml')
with open(j2_excludes_path) as role_data_file:
j2_excludes = yaml.safe_load(role_data_file)
if output_dir and not os.path.isdir(output_dir):
if os.path.exists(output_dir):
raise RuntimeError('Output dir %s is not a directory' % output_dir)
role_names = [r.get('name') for r in role_data]
r_map = {}
for r in role_data:
r_map[r.get('name')] = r
excl_templates = ['%s/%s' % (template_path, e)
for e in j2_excludes.get('name')]
if os.path.isdir(template_path):
for subdir, dirs, files in os.walk(template_path):
# NOTE(flaper87): Ignore hidden dirs as we don't
# generate templates for those.
# Note the slice assigment for `dirs` is necessary
# because we need to modify the *elements* in the
# dirs list rather than the reference to the list.
# This way we'll make sure os.walk will iterate over
# the shrunk list. os.walk doesn't have an API for
# filtering dirs at this point.
dirs[:] = [d for d in dirs if not d[0] == '.']
files = [f for f in files if not f[0] == '.']
# NOTE(flaper87): We could have used shutil.copytree
# but it requires the dst dir to not be present. This
# approach is safer as it doesn't require us to delete
# the output_dir in advance and it allows for running
# the command multiple times with the same output_dir.
out_dir = subdir
if output_dir:
out_dir = os.path.join(output_dir, subdir)
if not os.path.exists(out_dir):
for f in files:
file_path = os.path.join(subdir, f)
# We do two templating passes here:
# 1. *.role.j2.yaml - we template just the role name
# and create multiple files (one per role)
# 2. *.j2.yaml - we template with all roles_data,
# and create one file common to all roles
if f.endswith('.role.j2.yaml'):
print("jinja2 rendering role template %s" % f)
with open(file_path) as j2_template:
template_data = j2_template.read()
print("jinja2 rendering roles %s" % ","
for role in role_names:
j2_data = {'role': role}
# (dprince) For the undercloud installer we don't
# want to have heat check nova/glance API's
if r_map[role].get('disable_constraints', False):
j2_data['disable_constraints'] = True
out_f = "-".join(
out_f_path = os.path.join(out_dir, out_f)
if not (out_f_path in excl_templates):
_j2_render_to_file(template_data, j2_data,
out_f_path, overwrite)
print('skipping rendering of %s' % out_f_path)
elif f.endswith('.j2.yaml'):
print("jinja2 rendering normal template %s" % f)
with open(file_path) as j2_template:
template_data = j2_template.read()
j2_data = {'roles': role_data}
out_f = os.path.basename(f).replace('.j2.yaml', '.yaml')
out_f_path = os.path.join(out_dir, out_f)
_j2_render_to_file(template_data, j2_data, out_f_path,
elif output_dir:
shutil.copy(os.path.join(subdir, f), out_dir)
print('Unexpected argument %s' % template_path)
opts = parse_opts(sys.argv)
role_data_path = os.path.join(opts.base_path, opts.roles_data)
process_templates(opts.base_path, role_data_path, opts.output_dir, (not opts.safe))