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# 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_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_decoding(enc):
if not enc:
enc = ''
enc = enc.lower().strip()
# Translate to a mime-type (or set of) that will be understood
# when decoding (for now we only support a limited set of known mime-types)
# See: http://tiny.cc/m4kahw
# See: http://www.iana.org/assignments/media-types/index.html
if enc in ['gz', 'gzip']:
# Should we assume that this is 'always' base64?
# Someone might of got lucky and not had to encode it?
return ['application/x-gzip']
if enc in ['gz+base64', 'gzip+base64', 'gz+b64', 'gzip+b64']:
return ['application/base64', 'application/x-gzip']
if enc in ['base64', 'b64']:
return ['application/base64']
if enc in ['base32', 'b32']:
return ['application/base32']
if enc in ['base16', 'b16']:
return ['application/base16']
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)
decodings = canonicalize_decoding(f_info.get('encoding'))
contents = decode_contents(f_info.get('content', ''), decodings)
(u, g) = util.extract_usergroup(f_info.get('owner'))
perms = safe_int(f_info.get('permissions'), DEFAULT_PERMS)
util.write_file(path, contents, mode=perms)
util.chownbyname(path, u, g)
def safe_int(text, default):
try:
return int(text)
except (TypeError, ValueError):
return default
def decode_contents(contents, decodings):
result = str(contents)
for enc in decodings:
if enc == 'application/x-gzip':
result = util.decomp_gzip(result, quiet=False)
elif enc == 'application/base64':
result = base64.b64decode(result)
elif enc == 'application/base32':
result = base64.b32decode(result)
elif enc == 'application/base16':
result = base64.b16decode(result)
elif enc == UNKNOWN_ENC:
pass
return result
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