182 lines
6.3 KiB
Python
Executable file
182 lines
6.3 KiB
Python
Executable file
#!/usr/bin/env python
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# Copyright (C) 2021 Wes Barnett
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""Script for taking pre/post snapshots; run from pacman hooks."""
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from argparse import ArgumentParser
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from configparser import ConfigParser
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import json
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import logging
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from pathlib import Path
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import os
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import sys
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import tempfile
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logging.basicConfig(format="%(message)s", level=logging.INFO)
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class SnapperCmd:
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def __init__(self, config, snapshot_type, cleanup_algorithm, description="",
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nodbus=False, pre_number=None, userdata=""):
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self.cmd = ["snapper"]
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if nodbus:
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self.cmd.append("--no-dbus")
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self.cmd.extend([
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f"--config {config} create",
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f"--type {snapshot_type}",
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f"--cleanup-algorithm {cleanup_algorithm}",
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"--print-number"
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])
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if description:
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self.cmd.append(f"--description \"{description}\"")
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if userdata:
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self.cmd.append(f"--userdata \"{userdata}\"")
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if snapshot_type == "post":
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if pre_number is not None:
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self.cmd.append(f"--pre-number {pre_number}")
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else:
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raise ValueError("snapshot type specified as 'post' but no pre snapshot number passed.")
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def __call__(self):
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return os.popen(self.__str__()).read().rstrip("\n")
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def __str__(self):
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return " ".join(self.cmd)
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def get_snapper_configs(conf_file):
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"""Get the snapper configurations."""
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for line in conf_file.read_text().split("\n"):
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if line.startswith("SNAPPER_CONFIGS"):
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line = line.rstrip("\n").rstrip("\"").split("=")
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return line[1].lstrip("\"").split()
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def setup_config_parser(ini_file, parent_cmd, packages):
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"""Set up defaults for snap-pac configuration."""
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config = ConfigParser()
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config["DEFAULT"] = {
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"snapshot": False,
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"cleanup_algorithm": "number",
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"pre_description": parent_cmd,
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"post_description": " ".join(packages),
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"desc_limit": 72,
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"important_packages": [],
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"important_commands": [],
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"userdata": []
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}
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config["root"] = {
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"snapshot": True
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}
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config.read(ini_file)
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return config
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def get_description(snapshot_type, config, section):
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desc_limit = config.getint(section, "desc_limit")
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return config.get(section, f"{snapshot_type}_description")[:desc_limit]
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def get_pre_number(snapshot_type, prefile):
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if snapshot_type == "pre":
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pre_number = None
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else:
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try:
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pre_number = prefile.read_text()
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except FileNotFoundError:
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raise FileNotFoundError(f"prefile {prefile} not found. Ensure you have run the pre snapshot first.")
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else:
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prefile.unlink()
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return pre_number
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def check_important_commands(config, snapper_config, parent_cmd):
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important_commands = json.loads(config.get(snapper_config, "important_commands"))
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return parent_cmd in important_commands
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def check_important_packages(config, snapper_config, packages):
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important_packages = json.loads(config.get(snapper_config, "important_packages"))
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return any(x in important_packages for x in packages)
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def get_userdata(config, snapper_config, important):
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userdata = set(json.loads(config.get(snapper_config, "userdata")))
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if important:
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userdata.add("important=yes")
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return ",".join(sorted(list(userdata)))
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def check_skip():
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return os.getenv("SNAP_PAC_SKIP", "n").lower() in ["y", "yes", "true", "1"]
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if __name__ == "__main__":
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if check_skip():
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logging.warning("snapper snapshots skipped")
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quit()
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parser = ArgumentParser(description="Script for taking pre/post snapper snapshots. Used with pacman hooks.")
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parser.add_argument(dest="type", choices=["pre", "post"], help="snapper snapshot type")
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parser.add_argument(
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"--ini", dest="snap_pac_ini", type=Path,
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default=Path("/etc/snap-pac.ini"), help="snap-pac ini file path"
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)
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parser.add_argument(
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"--conf", dest="snapper_conf_file", type=Path,
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default=Path("/etc/conf.d/snapper"), help="snapper configuration file path"
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)
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args = parser.parse_args()
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snapshot_type = args.type
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snapper_conf_file = args.snapper_conf_file
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snap_pac_ini = args.snap_pac_ini
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parent_cmd = os.popen(f"ps -p {os.getppid()} -o args=").read().strip()
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packages = [line.rstrip("\n") for line in sys.stdin]
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config = setup_config_parser(snap_pac_ini, parent_cmd, packages)
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snapper_configs = get_snapper_configs(snapper_conf_file)
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chroot = os.stat("/") != os.stat("/proc/1/root/.")
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tmpdir = Path(tempfile.gettempdir())
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for snapper_config in snapper_configs:
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if snapper_config not in config:
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config.add_section(snapper_config)
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if config.getboolean(snapper_config, "snapshot"):
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prefile = tmpdir / f"snap-pac-pre_{snapper_config}"
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cleanup_algorithm = config.get(snapper_config, "cleanup_algorithm")
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description = get_description(snapshot_type, config, snapper_config)
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pre_number = get_pre_number(snapshot_type, prefile)
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important = (check_important_commands(config, snapper_config, parent_cmd) or
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check_important_packages(config, snapper_config, packages))
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userdata = get_userdata(config, snapper_config, important)
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snapper_cmd = SnapperCmd(snapper_config, snapshot_type, cleanup_algorithm,
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description, chroot, pre_number, userdata)
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num = snapper_cmd()
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logging.info(f"==> {snapper_config}: {num}")
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if snapshot_type == "pre":
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prefile.write_text(num)
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