Which log messages reveal a corrupted persistent.renpy file during Ren'Py deployment?

Identifying Persistence Corruption

Corruption of the persistent.renpy file is primarily revealed through Python-level exceptions during the engine's boot sequence. Because Ren'Py uses the pickle module for serialization, corruption typically manifests as failures to deserialize the binary data.

Critical Log Indicators

When a persistent.renpy file is truncated or contains invalid data, look for the following exceptions in traceback.txt or the console output:

• EOFError: Ran out of input: This is the most common indicator of a truncated file, often caused by a crash during a write operation or an interrupted deployment.
• _pickle.UnpicklingError: This indicates the file exists but contains data that does not conform to the pickle protocol, signaling binary corruption.
• AttributeError or ImportError: While not always "corruption" in the binary sense, these occur during persistence loading if the game's class definitions have changed significantly between versions, rendering the stored objects unreadable.

Analysis of Recovery Behavior

It is important to note that Ren'Py is designed to be resilient. If the engine encounters these errors during the load_persistent phase, it often catches the exception, logs the traceback, and silently initializes a fresh, empty persistence object. Consequently, the game may launch successfully, but the user will find all global flags and progress reset.

Verification and Recovery Steps

To confirm if persistence corruption is the cause of a deployment failure, follow these steps:

1. Check the traceback.txt file in the game's save directory (usually /game/saves or the OS-specific app data folder).
2. Search for the string renpy.game.python.load_persistent to see if the crash occurred during the persistence load cycle.
3. Verification Test: Move the persistent.renpy file to a backup location and restart the application. If the application boots normally, the file was corrupted.

Deployment Considerations

To increase robustness during updates, avoid manually modifying the persistence file via external scripts. If you are implementing an automated pipeline, you can add a pre-load check that validates the file size is greater than 0 bytes, though this will not detect internal binary corruption.

Diagnostic Detail Needed: Are you observing a complete application crash (CTD) or a successful launch with reset progress? This distinction determines whether the corruption is triggering a fatal engine error or a handled recovery.