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# The MIT License (MIT)
#
# Copyright (c) 2016 Adam Schubert
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from __future__ import annotations
# /// script
# requires-python = ">=3.11"
# dependencies = [
# "cron-descriptor",
# ]
# ///
import re
from pathlib import Path
try:
from cron_descriptor import ExpressionDescriptor, Options
except ImportError:
print("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
print('\033[1mFailed to import cron_descriptor, maybe ? "pip install cron-descriptor ?"\033[0m')
print("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
raise
class CrontabReader:
"""Simple example reading /etc/contab"""
rex = re.compile(r"^(\S{1,3}\s+\S{1,3}\s+\S{1,3}\s+\S{1,3}\s+\S{1,3}).+$")
def __init__(self, cronfile: Path) -> None:
"""Initialize CrontabReader
Args:
cronfile: Path to cronfile
Returns:
None
"""
options = Options()
options.day_of_week_start_index_zero = False
options.use_24hour_time_format = True
with cronfile.open("r", encoding="utf-8") as f:
for line in f.readlines():
if parsed_line := self.parse_cron_line(line):
print(f"{parsed_line} -> {ExpressionDescriptor(parsed_line, options)}")
def parse_cron_line(self, line: str) -> str | None:
"""Parses crontab line and returns only starting time string
Args:
line: crontab line
Returns:
Time part of cron line or None
"""
if (stripped := line.strip()) and not stripped.startswith("#"):
rexres = self.rex.search(stripped)
if rexres:
return " ".join(rexres.group(1).split())
return None
if __name__ == "__main__":
CrontabReader(Path("/etc/crontab"))
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