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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__)
MERGE_HEADER = 'Merge-Type'
DEF_MERGERS = mergers.default_mergers()
class CloudConfigPartHandler(handlers.Handler):
def __init__(self, paths, **_kwargs):
handlers.Handler.__init__(self, PER_ALWAYS, version=3)
self.cloud_buf = None
self.cloud_fn = paths.get_ipath("cloud_config")
self.file_names = []
self.mergers = [DEF_MERGERS]
def list_types(self):
return [
handlers.type_from_starts_with("#cloud-config"),
]
def _write_cloud_config(self):
if not self.cloud_fn:
return
# Capture which files we merged from...
file_lines = []
if self.file_names:
file_lines.append("# from %s files" % (len(self.file_names)))
for fn in self.file_names:
file_lines.append("# %s" % (fn))
file_lines.append("")
if self.cloud_buf is not None:
# Something was actually gathered....
lines = [
"#cloud-config",
'',
]
lines.extend(file_lines)
lines.append(util.yaml_dumps(self.cloud_buf))
else:
lines = []
util.write_file(self.cloud_fn, "\n".join(lines), 0600)
def _extract_mergers(self, payload, headers):
merge_header_headers = ''
for h in [MERGE_HEADER, 'X-%s' % (MERGE_HEADER)]:
tmp_h = headers.get(h, '')
if tmp_h:
merge_header_headers = tmp_h
break
# 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.
payload_yaml = util.load_yaml(payload)
mergers_yaml = mergers.dict_extract_mergers(payload_yaml)
mergers_header = mergers.string_extract_mergers(merge_header_headers)
all_mergers = []
all_mergers.extend(mergers_yaml)
all_mergers.extend(mergers_header)
if not all_mergers:
all_mergers = DEF_MERGERS
return all_mergers
def _merge_part(self, payload, headers):
next_mergers = self._extract_mergers(payload, headers)
# Use the merger list from the last call, since it is the one
# that will be defining how to merge with the next payload.
curr_mergers = list(self.mergers[-1])
LOG.debug("Merging by applying %s", curr_mergers)
self.mergers.append(next_mergers)
merger = mergers.construct(curr_mergers)
if self.cloud_buf is None:
# First time through, merge with an empty dict...
self.cloud_buf = {}
self.cloud_buf = merger.merge(self.cloud_buf,
util.load_yaml(payload))
def _reset(self):
self.file_names = []
self.cloud_buf = None
self.mergers = [DEF_MERGERS]
def handle_part(self, _data, ctype, filename, # pylint: disable=W0221
payload, _frequency, headers): # pylint: disable=W0613
if ctype == handlers.CONTENT_START:
self._reset()
return
if ctype == handlers.CONTENT_END:
self._write_cloud_config()
self._reset()
return
try:
self._merge_part(payload, headers)
self.file_names.append(filename)
except:
util.logexc(LOG, "Failed at merging in cloud config part from %s",
filename)
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