137 lines
4.7 KiB
Python
Executable file
137 lines
4.7 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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"""
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Script for taking pre/post snapshots; run from pacman hooks.
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"""
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from argparse import ArgumentParser
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from configparser import ConfigParser
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import logging
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import os
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import sys
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logging.basicConfig(format="%(message)s", level=logging.INFO)
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def create_snapper_cmd(preorpost, config, section, prefile):
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"""Populate the snapper command."""
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try:
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chroot = os.stat("/") != os.stat("/proc/1/root/.")
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except PermissionError:
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logging.warning("Unable to detect if in chroot. Run script as root.")
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chroot = False
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snapper_cmd = ["snapper"]
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if chroot:
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snapper_cmd.append("--no-dbus")
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snapper_cmd.append(f"--config {section} create")
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snapper_cmd.append(f"--type {preorpost}")
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snapper_cmd.append(f"--cleanup-algorithm {config.get(section, 'cleanup_algorithm')}")
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snapper_cmd.append("--print-number")
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desc_limit = config.getint(section, "desc_limit")
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if preorpost == "pre":
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snapper_cmd.append(f"--description {config.get(section, 'pre_description')[:desc_limit]}")
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else:
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snapper_cmd.append(f"--description {config.get(section, 'post_description')[:desc_limit]}")
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with open(prefile, "r") as f:
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pre_number = f.read().rstrip("\n")
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snapper_cmd.append(f"--pre-number {pre_number}")
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os.remove(prefile)
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return snapper_cmd
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def do_snapshot(preorpost, cmd, prefile):
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"""Run the actual snapper command and save snapshot number if pre snapshot."""
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num = os.popen(" ".join(cmd)).read().rstrip("\n")
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if preorpost == "pre":
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with open(prefile, "w") as f:
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f.write(num)
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return num
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def get_snapper_configs(conf_file):
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"""Get the snapper configurations."""
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with open(conf_file, "r") as f:
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for line in f:
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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": "".join(["\"", parent_cmd, "\""]),
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"post_description": "".join(["\"", packages, "\""]),
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"desc_limit": 72
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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 main(snap_pac_ini, snapper_conf_file, args):
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if os.getenv("SNAP_PAC_SKIP", "n") in ["y", "Y", "yes", "Yes", "YES"]:
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return False
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parent_cmd = os.popen(f"ps -p {os.getppid()} -o args=").read().strip()
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packages = " ".join([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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for c in snapper_configs:
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if c not in config:
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config.add_section(c)
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logging.debug(f"{c = }")
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if config.getboolean(c, "snapshot"):
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prefile = f"/tmp/snap-pac-pre_{c}"
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logging.debug(f"{prefile = }")
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try:
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snapper_cmd = create_snapper_cmd(args.preorpost, config, c, prefile)
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logging.debug(f"{snapper_cmd = }")
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except FileNotFoundError:
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logging.error(f"Error: File containing pre snapshot number not found for \"{c}\" configuration.")
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else:
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num = do_snapshot(args.preorpost, snapper_cmd, prefile)
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logging.info(f"==> {c}: {num}")
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return True
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if __name__ == "__main__":
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snap_pac_ini = "/etc/snap-pac.ini"
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logging.debug(f"{snap_pac_ini = }")
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snapper_conf_file = "/etc/conf.d/snapper"
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logging.debug(f"{snapper_conf_file = }")
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parser = ArgumentParser()
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parser.add_argument(dest="preorpost")
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args = parser.parse_args()
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if args.preorpost not in ["pre", "post"]:
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raise ValueError("preorpost must be 'pre' or 'post'")
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main(snap_pac_ini, snapper_conf_file, args)
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