Module cache 

Skip-if-unchanged cache helpers: content-hash markers, a cross-process build lock, and directory utilities.

Functions

clear_directory

Remove and recreate a directory.

dir_has_content

Whether a directory exists and contains at least one entry.

file_hash

Compute a fast, position-weighted hash of a file’s contents.

marker_matches

Whether a marker file exists and its contents equal expected_hash.

with_lock

Run f while holding an exclusive cross-process lock on lock_path.

write_marker

Write hash to a marker file.