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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
# Copyright (C) 2016 Amazon.com, Inc. or its affiliates.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
# Author: Andrew Jorgensen <ajorgens@amazon.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

# noqa: E402

import collections
import logging
import re
import sys
from typing import Any

from jinja2 import TemplateSyntaxError

from cloudinit import performance
from cloudinit import type_utils as tu
from cloudinit import util
from cloudinit.atomic_helper import write_file

# After bionic EOL, mypy==1.0.0 will be able to type-analyse dynamic
# base types, substitute this by:
# JUndefined: typing.Type
JUndefined: Any
try:
    from jinja2 import DebugUndefined as _DebugUndefined
    from jinja2 import Template as JTemplate

    JINJA_AVAILABLE = True
    JUndefined = _DebugUndefined
except (ImportError, AttributeError):
    JINJA_AVAILABLE = False
    JUndefined = object

LOG = logging.getLogger(__name__)
MISSING_JINJA_PREFIX = "CI_MISSING_JINJA_VAR/"


class JinjaSyntaxParsingException(TemplateSyntaxError):
    def __init__(
        self,
        error: TemplateSyntaxError,
    ) -> None:
        super().__init__(
            error.message or "unknown syntax error",
            error.lineno,
            error.name,
            error.filename,
        )
        self.source = error.source

    def __str__(self):
        """Avoid jinja2.TemplateSyntaxError multi-line __str__ format."""
        return self.format_error_message(
            syntax_error=self.message,
            line_number=self.lineno,
            line_content=self.source.splitlines()[self.lineno - 2].strip(),
        )

    @staticmethod
    def format_error_message(
        syntax_error: str,
        line_number: str,
        line_content: str = "",
    ) -> str:
        """Avoid jinja2.TemplateSyntaxError multi-line __str__ format."""
        line_content = f": {line_content}" if line_content else ""
        return JinjaSyntaxParsingException.message_template.format(
            syntax_error=syntax_error,
            line_number=line_number,
            line_content=line_content,
        )

    message_template = (
        "Unable to parse Jinja template due to syntax error: "
        "{syntax_error} on line {line_number}{line_content}"
    )


# Mypy, and the PEP 484 ecosystem in general, does not support creating
# classes with dynamic base types: https://stackoverflow.com/a/59636248
class UndefinedJinjaVariable(JUndefined):
    """Class used to represent any undefined jinja template variable."""

    def __str__(self):
        return "%s%s" % (MISSING_JINJA_PREFIX, self._undefined_name)

    def __sub__(self, other):
        other = str(other).replace(MISSING_JINJA_PREFIX, "")
        raise TypeError(
            'Undefined jinja variable: "{this}-{other}". Jinja tried'
            ' subtraction. Perhaps you meant "{this}_{other}"?'.format(
                this=self._undefined_name, other=other
            )
        )


@performance.timed("Rendering basic template")
def basic_render(content, params):
    """This does simple replacement of bash variable like templates.

    It identifies patterns like ${a} or $a and can also identify patterns like
    ${a.b} or $a.b which will look for a key 'b' in the dictionary rooted
    by key 'a'.
    """

    def replacer(match):
        # Only 1 of the 2 groups will actually have a valid entry.
        name = match.group(1)
        if name is None:
            name = match.group(2)
        if name is None:
            raise RuntimeError("Match encountered but no valid group present")
        path = collections.deque(name.split("."))
        selected_params = params
        while len(path) > 1:
            key = path.popleft()
            if not isinstance(selected_params, dict):
                raise TypeError(
                    "Can not traverse into"
                    " non-dictionary '%s' of type %s while"
                    " looking for subkey '%s'"
                    % (selected_params, tu.obj_name(selected_params), key)
                )
            selected_params = selected_params[key]
        key = path.popleft()
        if not isinstance(selected_params, dict):
            raise TypeError(
                "Can not extract key '%s' from non-dictionary '%s' of type %s"
                % (key, selected_params, tu.obj_name(selected_params))
            )
        return str(selected_params[key])

    return re.sub(
        r"\$\{([A-Za-z0-9_.]+)\}|\$([A-Za-z0-9_.]+)", replacer, content
    )


def detect_template(text):
    def jinja_render(content, params):
        # keep_trailing_newline is in jinja2 2.7+, not 2.6
        add = "\n" if content.endswith("\n") else ""
        try:
            with performance.Timed("Rendering jinja2 template"):
                return (
                    JTemplate(
                        content,
                        undefined=UndefinedJinjaVariable,
                        trim_blocks=True,
                        extensions=["jinja2.ext.do"],
                    ).render(**params)
                    + add
                )
        except TemplateSyntaxError as template_syntax_error:
            template_syntax_error.lineno += 1
            raise JinjaSyntaxParsingException(
                error=template_syntax_error,
            ) from template_syntax_error
        except Exception as unknown_error:
            raise unknown_error from unknown_error

    if text.find("\n") != -1:
        ident, rest = text.split("\n", 1)  # remove the first line
    else:
        ident = text
        rest = ""
    type_match = re.match(r"##\s*template:(.*)", ident, re.I)
    if not type_match:
        return ("basic", basic_render, text)
    else:
        template_type = type_match.group(1).lower().strip()
        if template_type not in ("jinja", "basic"):
            raise ValueError(
                "Unknown template rendering type '%s' requested"
                % template_type
            )
        if template_type == "jinja" and not JINJA_AVAILABLE:
            LOG.warning(
                "Jinja not available as the selected renderer for"
                " desired template, reverting to the basic renderer."
            )
            return ("basic", basic_render, rest)
        elif template_type == "jinja" and JINJA_AVAILABLE:
            return ("jinja", jinja_render, rest)
        # Only thing left over is the basic renderer (it is always available).
        return ("basic", basic_render, rest)


def render_from_file(fn, params):
    if not params:
        params = {}
    template_type, renderer, content = detect_template(util.load_text_file(fn))
    LOG.debug("Rendering content of '%s' using renderer %s", fn, template_type)
    return renderer(content, params)


def render_to_file(fn, outfn, params, mode=0o644):
    contents = render_from_file(fn, params)
    util.write_file(outfn, contents, mode=mode)


def render_string(content, params):
    """Render string"""
    if not params:
        params = {}
    _template_type, renderer, content = detect_template(content)
    return renderer(content, params)


def render_template(variant, template, output, is_yaml, prefix=None):
    contents = util.load_text_file(template)
    tpl_params = {"variant": variant, "prefix": prefix}
    contents = (render_string(contents, tpl_params)).rstrip() + "\n"
    if is_yaml:
        out = util.load_yaml(contents, default=True)
        if not out:
            raise RuntimeError(
                "Cannot render template file %s - invalid yaml." % template
            )
    if output == "-":
        sys.stdout.write(contents)
    else:
        write_file(output, contents, omode="w")

Filemanager

DIR : / usr/ lib/ python3/ dist-packages/ cloudinit/
Name Type Size Permission Actions
__pycache__ Folder 0755
analyze Folder 0755
cmd Folder 0755
config Folder 0755
distros Folder 0755
filters Folder 0755
handlers Folder 0755
log Folder 0755
mergers Folder 0755
net Folder 0755
reporting Folder 0755
sources Folder 0755
__init__.py File 0 B 0644
apport.py File 8.3 KB 0644
atomic_helper.py File 2.79 KB 0644
cloud.py File 3.22 KB 0644
dmi.py File 7.81 KB 0644
event.py File 2 KB 0644
features.py File 5.63 KB 0644
gpg.py File 7.99 KB 0644
helpers.py File 16.16 KB 0644
importer.py File 2.43 KB 0644
lifecycle.py File 7.79 KB 0644
netinfo.py File 24.07 KB 0644
performance.py File 3.1 KB 0644
persistence.py File 2.52 KB 0644
registry.py File 1022 B 0644
safeyaml.py File 10.11 KB 0644
settings.py File 2.12 KB 0644
signal_handler.py File 2.96 KB 0644
simpletable.py File 1.93 KB 0644
socket.py File 6.04 KB 0644
ssh_util.py File 22.44 KB 0644
stages.py File 41.53 KB 0644
subp.py File 12.36 KB 0644
temp_utils.py File 2.94 KB 0644
templater.py File 7.74 KB 0644
type_utils.py File 703 B 0644
url_helper.py File 38.18 KB 0644
user_data.py File 14.44 KB 0644
util.py File 90.51 KB 0644
version.py File 564 B 0644
warnings.py File 3.76 KB 0644

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