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