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Directory : /lib/python3/dist-packages/cloudinit/handlers/

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Current File : /lib/python3/dist-packages/cloudinit/handlers/shell_script_by_frequency.py

import os

from cloudinit import log, util
from cloudinit.handlers import Handler
from cloudinit.settings import PER_ALWAYS, PER_INSTANCE, PER_ONCE

LOG = log.getLogger(__name__)

# cloudinit/settings.py defines PER_*** frequency constants. It makes sense to
# use them here, instead of hardcodes, and map them to the 'per-***' frequency-
# specific folders in /v/l/c/scripts. It might make sense to expose this at a
# higher level or in a more general module -- eg maybe in cloudinit/settings.py
# itself -- but for now it's here.
path_map = {
    PER_ALWAYS: "per-boot",
    PER_INSTANCE: "per-instance",
    PER_ONCE: "per-once",
}


def get_mime_type_by_frequency(freq):
    mime_type = f"text/x-shellscript-{path_map[freq]}"
    return mime_type


def get_script_folder_by_frequency(freq, scripts_dir):
    """Return the frequency-specific subfolder for a given frequency constant
    and parent folder."""
    freqPath = path_map[freq]
    folder = os.path.join(scripts_dir, freqPath)
    return folder


def write_script_by_frequency(script_path, payload, frequency, scripts_dir):
    """Given a filename, a payload, a frequency, and a scripts folder, write
    the payload to the correct frequency-specific path"""
    filename = os.path.basename(script_path)
    filename = util.clean_filename(filename)
    folder = get_script_folder_by_frequency(frequency, scripts_dir)
    path = os.path.join(folder, filename)
    payload = util.dos2unix(payload)
    util.write_file(path, payload, 0o700)


class ShellScriptByFreqPartHandler(Handler):
    """Common base class for the frequency-specific script handlers."""

    def __init__(self, script_frequency, paths, **_kwargs):
        Handler.__init__(self, PER_ALWAYS)
        self.prefixes = [get_mime_type_by_frequency(script_frequency)]
        self.script_frequency = script_frequency
        self.scripts_dir = paths.get_cpath("scripts")
        if "script_path" in _kwargs:
            self.scripts_dir = paths.get_cpath(_kwargs["script_path"])

    def handle_part(self, data, ctype, script_path, payload, frequency):
        if script_path is not None:
            filename = os.path.basename(script_path)
            filename = util.clean_filename(filename)
            write_script_by_frequency(
                script_path, payload, self.script_frequency, self.scripts_dir
            )

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