100 lines
3.0 KiB
Python
100 lines
3.0 KiB
Python
# Copyright (C) 2013 Yahoo! Inc.
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# Copyright (C) 2014 Canonical, Ltd
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#
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# Author: Joshua Harlow <harlowja@yahoo-inc.com>
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# Author: Dustin Kirkland <kirkland@ubuntu.com>
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# Author: Scott Moser <scott.moser@canonical.com>
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#
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# This file is part of cloud-init. See LICENSE file for license information.
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"""Seed Random: Provide random seed data"""
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import base64
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import logging
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from io import BytesIO
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from cloudinit import subp, util
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from cloudinit.cloud import Cloud
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from cloudinit.config import Config
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from cloudinit.config.schema import MetaSchema
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from cloudinit.distros import ALL_DISTROS
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from cloudinit.settings import PER_INSTANCE
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LOG = logging.getLogger(__name__)
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meta: MetaSchema = {
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"id": "cc_seed_random",
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"distros": [ALL_DISTROS],
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"frequency": PER_INSTANCE,
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"activate_by_schema_keys": [],
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}
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def _decode(data, encoding=None):
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if not data:
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return b""
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if not encoding or encoding.lower() in ["raw"]:
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return util.encode_text(data)
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elif encoding.lower() in ["base64", "b64"]:
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return base64.b64decode(data)
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elif encoding.lower() in ["gzip", "gz"]:
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return util.decomp_gzip(data, quiet=False, decode=None)
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else:
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raise IOError("Unknown random_seed encoding: %s" % (encoding))
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def handle_random_seed_command(command, required, update_env):
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if not command and required:
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raise ValueError("no command found but required=true")
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elif not command:
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LOG.debug("no command provided")
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return
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cmd = command[0]
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if not subp.which(cmd):
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if required:
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raise ValueError(
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"command '{cmd}' not found but required=true".format(cmd=cmd)
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)
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else:
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LOG.debug("command '%s' not found for seed_command", cmd)
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return
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subp.subp(command, update_env=update_env, capture=False)
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def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
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mycfg = cfg.get("random_seed", {})
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seed_path = mycfg.get("file", "/dev/urandom")
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seed_data = mycfg.get("data", b"")
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seed_buf = BytesIO()
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if seed_data:
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seed_buf.write(_decode(seed_data, encoding=mycfg.get("encoding")))
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# 'random_seed' is set up by Azure datasource, and comes already in
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# openstack meta_data.json
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metadata = cloud.datasource.metadata
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if metadata and "random_seed" in metadata:
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seed_buf.write(util.encode_text(metadata["random_seed"]))
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seed_data = seed_buf.getvalue()
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if len(seed_data):
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LOG.debug(
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"%s: adding %s bytes of random seed entropy to %s",
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name,
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len(seed_data),
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seed_path,
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)
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util.append_file(seed_path, seed_data)
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command = mycfg.get("command", None)
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req = mycfg.get("command_required", False)
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try:
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handle_random_seed_command(
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command=command,
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required=req,
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update_env={"RANDOM_SEED_FILE": seed_path},
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)
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except ValueError as e:
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LOG.warning("handling random command [%s] failed: %s", command, e)
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raise e
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