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Peter Wood 2bc9e91229 Refactor Plex Database Repair Logic

- Created a centralized database repair script (`plex-database-repair.sh`) to handle all database integrity checks and repairs for Plex Media Server.
- Updated the main Plex management script (`plex.sh`) to integrate the new repair functionality and fixed Unicode/ASCII display issues.
- Refactored the backup script (`backup-plex.sh`) to remove duplicate repair functions and ensure it utilizes the new repair script.
- Conducted thorough code validation and functional testing to ensure all scripts operate correctly with the new changes.
- Enhanced documentation for the new repair script, detailing usage, features, and integration points with other scripts.
- Fixed critical bugs related to WAL file handling and corrected typos in script options.

2025-06-21 06:30:07 -04:00

4.8 KiB

Raw Blame History

Plex Database Repair Utility

Overview

The plex-database-repair.sh script provides comprehensive database repair functionality for Plex Media Server. It has been extracted from the backup-plex.sh script to be reusable across multiple scripts in the Plex management suite.

Features

Database Integrity Verification: Uses Plex's custom SQLite binary for accurate integrity checking
WAL File Management: Properly handles Write-Ahead Logging files during repair operations
Multiple Repair Strategies:
1. SQL Dump/Restore approach with validation
2. Schema recreation with data recovery
3. Recovery from previous backups
Comprehensive Error Handling: Graceful recovery and rollback on failure
Ownership Preservation: Ensures proper file ownership for the plex user

Usage

Command Line Interface

# Check database integrity only
./plex-database-repair.sh check <database_file>

# Attempt to repair corrupted database
./plex-database-repair.sh repair <database_file>

# Force repair without prompts (for automation)
./plex-database-repair.sh force-repair <database_file>

Integration with Other Scripts

The repair script is designed to be called from other scripts:

# Source the script to use its functions
source /path/to/plex-database-repair.sh

# Use functions directly
check_database_integrity "/path/to/database.db"
repair_database "/path/to/database.db" false

Examples

Basic Integrity Check

./plex-database-repair.sh check "/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-in Support/Databases/com.plexapp.plugins.library.db"

Repair Corrupted Database

./plex-database-repair.sh repair "/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-in Support/Databases/com.plexapp.plugins.library.db"

Exit Codes

0: Success (database is healthy or successfully repaired)
1: Database has issues but repair failed
2: Critical error (cannot access database or repair tools)

Dependencies

Plex Media Server: Must be installed with the custom SQLite binary
Standard Unix tools: cp, mv, rm, chown, sync
sudo access: Required for accessing Plex files and changing ownership

Integration Points

plex.sh

The main Plex management script uses this repair utility for:

Pre-startup integrity checking
Manual database repair command (plex.sh repair)

backup-plex.sh

The backup script uses this utility for:

Pre-backup integrity verification
Automatic repair during backup process
Database corruption detection and handling

Technical Details

Repair Strategies

SQL Dump/Restore:
- Creates a complete SQL dump of the corrupted database
- Validates dump contains essential Plex tables
- Creates new database from validated dump
- Verifies integrity of repaired database
Schema Recreation:
- Extracts schema from corrupted database
- Creates new database with clean schema
- Attempts table-by-table data recovery
- Considers successful if 80% of tables recovered
Backup Recovery:
- Locates most recent valid backup
- Extracts and validates backup database
- Replaces corrupted database with backup version

WAL File Handling

The script properly manages SQLite Write-Ahead Logging files:

Prepare: Performs WAL checkpoint and creates backups
Cleanup: Removes WAL/SHM files and restores WAL mode
Restore: Restores WAL/SHM files if repair fails

Safety Measures

Creates pre-repair backups before any modifications
Uses atomic file operations where possible
Forces filesystem sync after critical operations
Preserves original database if all repair strategies fail
Ensures proper file ownership and permissions

Troubleshooting

Common Issues

Permission Denied: Ensure script has sudo access and Plex files are accessible
Plex SQLite Not Found: Verify Plex Media Server is properly installed
Insufficient Disk Space: Repair process requires significant temporary space
Service Access: Ensure Plex service can be stopped/started during repair

Recovery Options

If repair fails:

Check backup-plex.sh for recent backups
Examine corrupted database directories for recovery files
Consider manual database reconstruction using Plex tools
Contact Plex support for advanced recovery options

plex.sh: Main Plex service management
backup-plex.sh: Comprehensive backup solution
restore-plex.sh: Backup restoration utilities
validate-plex-backups.sh: Backup validation tools

Changelog

v1.0 (2025-06-18)

Initial extraction from backup-plex.sh
Added standalone command-line interface
Enhanced ownership preservation
Improved error handling and logging

4.8 KiB Raw Blame History