85 lines
2.4 KiB
Python
85 lines
2.4 KiB
Python
"""
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Module with backup functions.
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"""
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import logging
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import os
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import pathlib
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import shutil
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from datetime import datetime
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from typing import Optional
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import spqr.curateipsum.fs as fs
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BACKUP_ENT_FMT = "%y%m%d_%H%M"
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_lg = logging.getLogger(__name__)
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def _is_backup_entity(entity_path: pathlib.Path) -> bool:
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""" Check if entity_path is a single backup dir. """
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try:
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datetime.strptime(entity_path.name, BACKUP_ENT_FMT)
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return True
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except ValueError:
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return False
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def _get_latest_backup(backup_dir: pathlib.Path) -> Optional[pathlib.Path]:
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""" Returns path to latest backup created in backup_dir or None. """
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backups = sorted(os.listdir(backup_dir), reverse=True)
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for b_ent in backups:
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b_ent_abs = pathlib.Path(os.path.join(backup_dir, b_ent))
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if not _is_backup_entity(b_ent_abs):
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continue
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if not os.listdir(b_ent_abs):
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_lg.info("Removing empty backup entity: %s", b_ent_abs.name)
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_lg.debug("Removing directory %s", b_ent_abs)
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os.rmdir(b_ent_abs)
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continue
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return b_ent_abs
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return None
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def initiate_backup(sources, backup_dir: pathlib.Path, dry_run=False):
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""" Main backup function """
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cur_backup = pathlib.Path(
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os.path.join(backup_dir, datetime.now().strftime(BACKUP_ENT_FMT))
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)
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_lg.debug("Current backup dir: %s", cur_backup)
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latest_backup = _get_latest_backup(backup_dir)
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if cur_backup == latest_backup:
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_lg.warning(
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"Latest backup %s was created less than minute ago, exiting",
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latest_backup.name,
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)
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return
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if latest_backup is None:
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_lg.info("Creating empty directory for current backup: %s", cur_backup.name)
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os.mkdir(cur_backup)
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else:
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_lg.info(
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"Copying data from latest backup %s to current backup %s",
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latest_backup.name,
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cur_backup.name,
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)
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hl_res = fs.hardlink_dir(latest_backup, cur_backup)
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if not hl_res:
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_lg.error("Something went wrong during copying data from latest backup,"
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" removing created %s", cur_backup.name)
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shutil.rmtree(cur_backup, ignore_errors=True)
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return
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if dry_run:
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_lg.info("Dry-run, removing created backup: %s", cur_backup.name)
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shutil.rmtree(cur_backup, ignore_errors=True)
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else:
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_lg.info("Backup created: %s", cur_backup.name)
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