1+ """
2+ Backup and Restore Module
3+ Provides secure backup and restore functionality with CRC32 checksum verification.
4+
5+ Descriptions taken from:
6+ Not yet.
7+ """
8+
9+ class _checkError (Exception ):
10+ """Custom exception for backup check failures"""
11+
12+ def __init__ (self , value : str ):
13+ """
14+ :param value: Error description
15+ """
16+ def __str__ (self ) -> str :
17+ """Returns string representation of the error
18+
19+ :return: Error description string
20+ """
21+
22+ def bak_update (file : str , data : any ) -> int :
23+ """Updates or creates a backup file with checksum verification
24+
25+ :param file: File path to update (auto-prefixed with '/' if needed)
26+ :param data: Data to store (dict for new files, any type for existing)
27+ :return:
28+ 0 - Success
29+ -1 - Invalid input or file exists
30+ -2 - Flag check failed
31+ -3 - Backup disabled
32+ -5 - Operation failed
33+
34+ Process:
35+ 1. Mounts secure backup filesystem
36+ 2. Creates primary file if missing
37+ 3. Copies file to backup location
38+ 4. Updates checksums for both files
39+ """
40+
41+ def bak_file (file : str ) -> any :
42+ """Retrieves a file from backup storage
43+
44+ :param file: File path to retrieve (auto-prefixed with '/' if needed)
45+ :return:
46+ File content on success
47+ -1 - File not found
48+ -2 - Flag check failed
49+ -3 - Backup disabled
50+ -4 - Checksum mismatch
51+ -5 - Operation failed
52+ -6 - Copy failed
53+
54+ Process:
55+ 1. Mounts secure backup filesystem
56+ 2. Copies backup file to primary location
57+ 3. Verifies checksums
58+ """
59+
60+ def main () -> None :
61+ """Main backup restore procedure
62+
63+ Automatically performs:
64+ 1. Checks backup restore flag
65+ 2. Compares CRC32 checksums
66+ 3. Restores mismatched files from backup
67+ 4. Updates checksum database
68+
69+ Note: Runs automatically on module import
70+ """
71+
72+ def _get_backup_restore_flag () -> bool :
73+ """Internal: Gets backup enable flag (not for direct use)
74+
75+ :return: True if backup enabled, False otherwise
76+ """
77+
78+ def _check () -> str :
79+ """Internal: Validates backup flag file (not for direct use)
80+
81+ :return: JSON content of flag file
82+ :raises _checkError: If file missing or empty
83+ """
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