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BUGGY_CACHE_PURGING.md

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Buggy Cache Purging

This document should not affect most users unless finding that the Rust build cache stops working.

Running bolt up or bolt check may frequently rebuild services if there is a problem with the Bolt generation code. These problems are usually not obvious.

Cause

Two factors can cause this:

  • Bolt frequently regenerates files (e.g. lib/bolt/core/src/tasks/gen.rs)
  • Rivet services often use build.rs scripts that can trigger rebuilds

Solution

Run this command:

CARGO_LOG=cargo::core::compiler::fingerprint=info bolt check

Search the logs for lines starting with stale:. This is what is causing a rebuild.

If this is a file generated by Bolt, ensure that Bolt is using write_if_different when writing the file.

If the file is JSON and uses a HashMap, then try encoding the file using cjson for a deterministic output.