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apport.py	8.27 MB	View DL Edit
atomic_helper.py	2.79 MB	View DL Edit
cloud.py	3.71 MB	View DL Edit
dmi.py	7.86 MB	View DL Edit
event.py	2 MB	View DL Edit
features.py	4.87 MB	View DL Edit
gpg.py	7.99 MB	View DL Edit
helpers.py	16.16 MB	View DL Edit
importer.py	2.43 MB	View DL Edit
lifecycle.py	7.78 MB	View DL Edit
netinfo.py	24.02 MB	View DL Edit
performance.py	3.1 MB	View DL Edit
persistence.py	2.52 MB	View DL Edit
registry.py	1022 B	View DL Edit
safeyaml.py	10.11 MB	View DL Edit
settings.py	2.15 MB	View DL Edit
signal_handler.py	1.75 MB	View DL Edit
simpletable.py	1.93 MB	View DL Edit
socket.py	5.93 MB	View DL Edit
ssh_util.py	22.22 MB	View DL Edit
stages.py	41.53 MB	View DL Edit
subp.py	12.36 MB	View DL Edit
templater.py	7.8 MB	View DL Edit
temp_utils.py	2.94 MB	View DL Edit
type_utils.py	703 B	View DL Edit
url_helper.py	34.7 MB	View DL Edit
user_data.py	14.44 MB	View DL Edit
util.py	91.22 MB	View DL Edit
version.py	564 B	View DL Edit
warnings.py	3.76 MB	View DL Edit
__init__.py	0 B	View DL Edit

Edit file: /lib/python3.9/site-packages/cloudinit/atomic_helper.py

# This file is part of cloud-init. See LICENSE file for license information.

import json
import logging
import os
import stat
import tempfile
from base64 import b64decode, b64encode

from cloudinit import performance, util

_DEF_PERMS = 0o644
LOG = logging.getLogger(__name__)

@performance.timed("Base64 decoding")
def b64d(source):
    """base64 decode data

:param source: a bytes or str to decode
    :return: base64 as a decoded str if utf-8 encoded, otherwise bytes
    """
    decoded = b64decode(source)
    try:
        return decoded.decode("utf-8")
    except UnicodeDecodeError:
        return decoded

@performance.timed("Base64 encoding")
def b64e(source):
    """base64 encode data

:param source: a bytes or str to decode
    :return: base64 encoded str
    """
    if not isinstance(source, bytes):
        source = source.encode("utf-8")
    return b64encode(source).decode("utf-8")

def write_file(
    filename, content, mode=_DEF_PERMS, omode="wb", preserve_mode=False
):
    """open filename in mode omode, write content, set permissions to mode"""

with performance.Timed(f"Writing {filename}"):
        return _write_file(filename, content, mode, omode, preserve_mode)

def _write_file(
    filename, content, mode=_DEF_PERMS, omode="wb", preserve_mode=False
):
    if preserve_mode:
        try:
            file_stat = os.stat(filename)
            mode = stat.S_IMODE(file_stat.st_mode)
        except OSError:
            pass

tf = None
    try:
        dirname = os.path.dirname(filename)
        util.ensure_dir(dirname)
        tf = tempfile.NamedTemporaryFile(dir=dirname, delete=False, mode=omode)
        LOG.debug(
            "Atomically writing to file %s (via temporary file %s) - %s: [%o]"
            " %d bytes/chars",
            filename,
            tf.name,
            omode,
            mode,
            len(content),
        )
        tf.write(content)
        tf.close()
        os.chmod(tf.name, mode)
        os.rename(tf.name, filename)
    except Exception as e:
        if tf is not None:
            os.unlink(tf.name)
        raise e

def json_serialize_default(_obj):
    """Handler for types which aren't json serializable."""
    try:
        return "ci-b64:{0}".format(b64e(_obj))
    except AttributeError:
        return "Warning: redacted unserializable type {0}".format(type(_obj))

@performance.timed("Dumping json")
def json_dumps(data):
    """Return data in nicely formatted json."""
    return json.dumps(
        data,
        indent=1,
        sort_keys=True,
        separators=(",", ": "),
        default=json_serialize_default,
    )

def write_json(filename, data, mode=_DEF_PERMS):
    # dump json representation of data to file filename.
    return write_file(
        filename,
        json_dumps(data) + "\n",
        omode="w",
        mode=mode,
    )

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