build: enable Lake artifact caching - #246
Merged
Merged
Conversation
ejgallego
marked this pull request as ready for review
August 30, 2026 22:37
ejgallego
force-pushed
the
codex/lake-artifact-cache
branch
from
August 30, 2026 22:48
d2632b0 to
5b1b2c1
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This PR enables the Lake local artifact cache for Beam builds and restores cached outputs into the ordinary .lake/build layout, so repeated builds and task worktrees can reuse unchanged compilation artifacts without changing wrapper or installer paths. CI keeps the mutable artifact cache separate from elan and package caches, restores it for every Lean job, and uses beam-fast as the sole writer per OS and commit; restricted automation can redirect LAKE_CACHE_DIR, while save/checkpoint fixtures continue disabling the cache to preserve replay coverage.