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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from cloudinit import handlers
from cloudinit import log as logging
from cloudinit import mergers
from cloudinit import util
from cloudinit.settings import (PER_ALWAYS)
LOG = logging.getLogger(__name__)
DEF_MERGE_TYPE = "list+dict+str"
MERGE_HEADER = 'Merge-Type'
class CloudConfigPartHandler(handlers.Handler):
def __init__(self, paths, **_kwargs):
handlers.Handler.__init__(self, PER_ALWAYS, version=3)
self.cloud_buf = {}
self.cloud_fn = paths.get_ipath("cloud_config")
def list_types(self):
return [
handlers.type_from_starts_with("#cloud-config"),
]
def _write_cloud_config(self, buf):
if not self.cloud_fn:
return
# Write the combined & merged dictionary/yaml out
lines = ["#cloud-config", util.yaml_dumps(self.cloud_buf)]
util.write_file(self.cloud_fn, "\n".join(lines), 0600)
def _merge_header_extract(self, payload_yaml):
merge_header_yaml = ''
for k in [MERGE_HEADER, MERGE_HEADER.lower(),
MERGE_HEADER.lower().replace("-", "_")]:
if k in payload_yaml:
merge_header_yaml = str(payload_yaml[k])
break
return merge_header_yaml
def _merge_part(self, payload, headers, filename):
merge_header_headers = headers.get(MERGE_HEADER, '')
try:
payload_y = util.load_yaml(payload)
merge_how = ''
# Select either the merge-type from the content
# or the merge type from the headers or default to our own set
# if neither exists (or is empty) from the later
merge_header_yaml = self._merge_header_extract(payload_y)
for merge_i in [merge_header_yaml, merge_header_headers]:
merge_i = merge_i.strip().lower()
if merge_i:
merge_how = merge_i
break
if not merge_how:
merge_how = DEF_MERGE_TYPE
merger = mergers.construct(merge_how)
self.cloud_buf = merger.merge(self.cloud_buf, payload_y)
except:
util.logexc(LOG, "Failed at merging in cloud config part from %s",
filename)
def handle_part(self, _data, ctype, filename, payload, _freq, headers):
if ctype == handlers.CONTENT_START:
self.cloud_buf = {}
return
if ctype == handlers.CONTENT_END:
self._write_cloud_config(self.cloud_buf)
self.cloud_buf = {}
return
self._merge_part(payload, headers, filename)
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