c1bd47035f
This implements file writing via cloud-config. It also * adjusts other code to have user/group parsing in util instead of in stages.py, * renames decomp_str to decomp_gzip since it is more meaningful when named that (as thats all it can decompress).
103 lines
3.5 KiB
Python
103 lines
3.5 KiB
Python
# vi: ts=4 expandtab
|
|
#
|
|
# Copyright (C) 2012 Yahoo! Inc.
|
|
#
|
|
# 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/>.
|
|
|
|
import base64
|
|
import os
|
|
|
|
from cloudinit import util
|
|
from cloudinit.settings import PER_INSTANCE
|
|
|
|
frequency = PER_INSTANCE
|
|
|
|
DEFAULT_OWNER = "root:root"
|
|
DEFAULT_PERMS = 0644
|
|
UNKNOWN_ENC = 'text/plain'
|
|
|
|
|
|
def handle(name, cfg, _cloud, log, _args):
|
|
files = cfg.get('write_files')
|
|
if not files:
|
|
log.debug(("Skipping module named %s,"
|
|
" no/empty 'write_files' key in configuration"), name)
|
|
return
|
|
write_files(name, files, log)
|
|
|
|
|
|
def canonicalize_extraction(encoding_type, log):
|
|
if not encoding_type:
|
|
encoding_type = ''
|
|
encoding_type = encoding_type.lower().strip()
|
|
if encoding_type in ['gz', 'gzip']:
|
|
return ['application/x-gzip']
|
|
if encoding_type in ['gz+base64', 'gzip+base64', 'gz+b64', 'gzip+b64']:
|
|
return ['application/base64', 'application/x-gzip']
|
|
# Yaml already encodes binary data as base64 if it is given to the
|
|
# yaml file as binary, so those will be automatically decoded for you.
|
|
# But the above b64 is just for people that are more 'comfortable'
|
|
# specifing it manually (which might be a possiblity)
|
|
if encoding_type in ['b64', 'base64']:
|
|
return ['application/base64']
|
|
if encoding_type:
|
|
log.warn("Unknown encoding type %s, assuming %s",
|
|
encoding_type, UNKNOWN_ENC)
|
|
return [UNKNOWN_ENC]
|
|
|
|
|
|
def write_files(name, files, log):
|
|
if not files:
|
|
return
|
|
|
|
for (i, f_info) in enumerate(files):
|
|
path = f_info.get('path')
|
|
if not path:
|
|
log.warn("No path provided to write for entry %s in module %s",
|
|
i + 1, name)
|
|
continue
|
|
path = os.path.abspath(path)
|
|
extractions = canonicalize_extraction(f_info.get('encoding'), log)
|
|
contents = extract_contents(f_info.get('content', ''), extractions)
|
|
(u, g) = util.extract_usergroup(f_info.get('owner', DEFAULT_OWNER))
|
|
perms = decode_perms(f_info.get('permissions'), DEFAULT_PERMS, log)
|
|
util.write_file(path, contents, mode=perms)
|
|
util.chownbyname(path, u, g)
|
|
|
|
|
|
def decode_perms(perm, default, log):
|
|
try:
|
|
if isinstance(perm, (int, long, float)):
|
|
# Just 'downcast' it (if a float)
|
|
return int(perm)
|
|
else:
|
|
# Force to string and try octal conversion
|
|
return int(str(perm), 8)
|
|
except (TypeError, ValueError):
|
|
log.warn("Undecodable permissions %s, assuming %s", perm, default)
|
|
return default
|
|
|
|
|
|
def extract_contents(contents, extraction_types):
|
|
result = str(contents)
|
|
for t in extraction_types:
|
|
if t == 'application/x-gzip':
|
|
result = util.decomp_gzip(result, quiet=False)
|
|
elif t == 'application/base64':
|
|
result = base64.b64decode(result)
|
|
elif t == UNKNOWN_ENC:
|
|
pass
|
|
return result
|