Cas Central Git Store

CAS keeps a central Git store for incremental fetches

CAS now keeps one bare Git repository per remote URL inside its store, under ~/.cache/terragrunt/cas/store/git/ on Linux by default. See Storage for where this lives on macOS and Windows. On a cache miss, Terragrunt fetches just the requested ref into that repository instead of running a fresh shallow clone into a temporary directory. Repeated misses against the same remote reuse the existing pack files, so fetching a second ref from the same repository transfers only the new objects.

Concurrent Terragrunt runs against the same remote URL share one fetch instead of cloning in parallel; later runs reuse what the first one transferred. If the shared fetch hangs or fails, Terragrunt logs a warning and falls back to a temporary clone so cloning still succeeds.

You can reclaim space at any time by deleting the git/ subdirectory:

rm -rf ~/.cache/terragrunt/cas/store/git