132 lines
3.8 KiB
Python
132 lines
3.8 KiB
Python
#!/usr/bin/python3
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"""
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.. moduleauthor:: Eric Torres
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Run a backup, creating a snapshot in the process.
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Command-Line Arguments
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======================
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-c, --use-checksums use rsync's checksum feature to detect file changes
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-d, --dry-run make this backup a dry run
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--debug show debug messages
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-n, --name name to give to the backup snapshot
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-p, --port port that ssh on the destination is listening on
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-s, --run-post-sync run sync syscall after backup
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-u, --umask umask value to use while running backup process
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-v, --verbose show info messages
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On each run of this script, a new snapshot is made and any unchanged
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files are hardlinked into the new snapshot.
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"""
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import argparse
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import logging
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import os
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import sys
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import rbackup.config.config_files as config
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import rbackup.script as script
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from rbackup.struct.repository import Repository
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# ========== Constants ==========
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LOGFORMAT = "==> %(levelname)s %(message)s"
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EXTRA_RSYNC_OPTS = {
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"dry_run": "--dry-run",
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"delete": "--delete-after",
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"checksum": "--checksum",
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"update": "--update",
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}
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# ----- Error Codes -----
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E_PERMISSION = 13
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# ========== Logging Setup ==========
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console_formatter = logging.Formatter(LOGFORMAT)
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syslog = logging.getLogger("rbackup")
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syslog.setLevel(logging.DEBUG)
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stdout_handler = logging.StreamHandler(sys.stdout)
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stdout_handler.setLevel(logging.INFO)
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stdout_handler.setFormatter(console_formatter)
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stdout_handler.addFilter(lambda record: record.levelno <= logging.INFO)
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stderr_handler = logging.StreamHandler(sys.stderr)
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stderr_handler.setLevel(logging.WARNING)
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stderr_handler.setFormatter(console_formatter)
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syslog.addHandler(stdout_handler)
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syslog.addHandler(stderr_handler)
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# ========== Functions ==========
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def parse_cmdline_arguments(**kwargs):
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"""Parse command line arguments passed to the script.
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All kwargs are passed to ArgumentParser.parse_args().
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:rtype: argparse.Namespace object
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"""
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"-c",
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"--use-checksums",
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action="store_const",
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dest="extra_rsync_opts",
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const=EXTRA_RSYNC_OPTS["checksum"],
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help="use rsync's checksumming feature to look for changed files",
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)
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parser.add_argument(
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"-d",
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"--dry-run",
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action="append_const",
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dest="extra_rsync_opts",
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const=EXTRA_RSYNC_OPTS["dry_run"],
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help="pass --dry-run to rsync",
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)
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parser.add_argument("--debug", action="store_true", help="log debug messages")
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parser.add_argument(
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"-n", "--name", default=None, help="name to give to the snapshot"
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)
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parser.add_argument(
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"-p", "--port", default=22, help="port that ssh on the destination is listening on"
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)
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parser.add_argument(
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"-s",
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"--run-post-sync",
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action="store_true",
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help="run sync operation after backup is complete",
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)
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parser.add_arguemnt(
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"-u", "--umask", type=int, default=None, help="umask value to use while running backup process"
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)
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parser.add_argument(
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"-v", "--verbose", action="store_true", help="log info messages"
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)
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parser.add_argument("repository", help="repository to back up to", metavar="repo")
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return parser.parse_args(**kwargs)
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# ========== Main Script ==========
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if __name__ == "__main__":
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args = parse_cmdline_arguments()
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try:
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parsed_config = config.parse_configfile()
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repo = Repository(args.repository)
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except PermissionError as e:
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syslog.critical(e)
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exit(E_PERMISSION)
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else:
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script.do_backup(repo, parsed_config, args)
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if args.verbose:
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stdout_handler.setLevel(logging.INFO)
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if args.debug:
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stdout_handler.setLevel(logging.DEBUG)
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if args.run_post_sync:
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syslog.info("Running sync operation")
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os.sync()
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