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Migrates an old cache database file from the 'rmfuse' directory to the 'rmcl' directory in the XDG cache home location.

Purpose

This function handles backward compatibility by automatically migrating the cache database from the old 'rmfuse' directory structure to the new 'rmcl' directory structure. It checks if the old cache file exists and the new one doesn't, then moves the old file to the new location, creating necessary parent directories. This ensures users don't lose their cached data when upgrading from an older version of the software.

Source Code

def _fix_old_cache_dir():
    # 2/14/2021 -- We had been using the 'rmfuse' cache directory since
    # early development.  Let's use rmcl instead.  But we'll move the
    # existing DB over, if it exists and the new one doesn't.
    old_cache_file = xdg_cache_home() / 'rmfuse' / 'filedata.db'
    if old_cache_file.exists() and not CACHE_FILE.exists():
        CACHE_FILE.parent.mkdir(parents=True, exist_ok=True)
        old_cache_file.rename(CACHE_FILE)

Return Value

This function returns None. It performs a side effect of moving a file from one location to another if certain conditions are met.

Dependencies

• xdg

Required Imports

from xdg import xdg_cache_home

Usage Example

from pathlib import Path
from xdg import xdg_cache_home

# Define CACHE_FILE constant (required for the function to work)
CACHE_FILE = xdg_cache_home() / 'rmcl' / 'filedata.db'

def _fix_old_cache_dir():
    old_cache_file = xdg_cache_home() / 'rmfuse' / 'filedata.db'
    if old_cache_file.exists() and not CACHE_FILE.exists():
        CACHE_FILE.parent.mkdir(parents=True, exist_ok=True)
        old_cache_file.rename(CACHE_FILE)

# Call the function during application initialization
_fix_old_cache_dir()

Best Practices

• This function should be called once during application initialization before any cache operations
• Ensure CACHE_FILE is defined as a module-level constant before calling this function
• The function is idempotent - safe to call multiple times as it only acts when conditions are met
• This is a one-time migration function that can be removed in future versions after sufficient time has passed
• The function silently does nothing if the old cache doesn't exist or the new cache already exists
• Requires appropriate file system permissions to create directories and move files

Tags

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