103 lines
3.5 KiB
Python
103 lines
3.5 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2012 Yahoo! Inc.
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#
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import base64
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import os
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from cloudinit.settings import PER_INSTANCE
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from cloudinit import util
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frequency = PER_INSTANCE
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DEFAULT_OWNER = "root:root"
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DEFAULT_PERMS = 0644
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UNKNOWN_ENC = 'text/plain'
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def handle(name, cfg, _cloud, log, _args):
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files = cfg.get('write_files')
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if not files:
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log.debug(("Skipping module named %s,"
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" no/empty 'write_files' key in configuration"), name)
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return
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write_files(name, files, log)
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def canonicalize_extraction(encoding_type, log):
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if not encoding_type:
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encoding_type = ''
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encoding_type = encoding_type.lower().strip()
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if encoding_type in ['gz', 'gzip']:
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return ['application/x-gzip']
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if encoding_type in ['gz+base64', 'gzip+base64', 'gz+b64', 'gzip+b64']:
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return ['application/base64', 'application/x-gzip']
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# Yaml already encodes binary data as base64 if it is given to the
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# yaml file as binary, so those will be automatically decoded for you.
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# But the above b64 is just for people that are more 'comfortable'
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# specifing it manually (which might be a possiblity)
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if encoding_type in ['b64', 'base64']:
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return ['application/base64']
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if encoding_type:
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log.warn("Unknown encoding type %s, assuming %s",
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encoding_type, UNKNOWN_ENC)
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return [UNKNOWN_ENC]
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def write_files(name, files, log):
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if not files:
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return
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for (i, f_info) in enumerate(files):
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path = f_info.get('path')
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if not path:
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log.warn("No path provided to write for entry %s in module %s",
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i + 1, name)
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continue
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path = os.path.abspath(path)
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extractions = canonicalize_extraction(f_info.get('encoding'), log)
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contents = extract_contents(f_info.get('content', ''), extractions)
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(u, g) = util.extract_usergroup(f_info.get('owner', DEFAULT_OWNER))
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perms = decode_perms(f_info.get('permissions'), DEFAULT_PERMS, log)
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util.write_file(path, contents, mode=perms)
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util.chownbyname(path, u, g)
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def decode_perms(perm, default, log):
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try:
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if isinstance(perm, (int, long, float)):
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# Just 'downcast' it (if a float)
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return int(perm)
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else:
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# Force to string and try octal conversion
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return int(str(perm), 8)
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except (TypeError, ValueError):
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log.warn("Undecodable permissions %s, assuming %s", perm, default)
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return default
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def extract_contents(contents, extraction_types):
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result = str(contents)
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for t in extraction_types:
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if t == 'application/x-gzip':
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result = util.decomp_gzip(result, quiet=False)
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elif t == 'application/base64':
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result = base64.b64decode(result)
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elif t == UNKNOWN_ENC:
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pass
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return result
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