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Claude Notes

Cargo

  • Do not commit an absolute [build].target-dir; hosted CI and published packages must use repo-local or runner-local paths.
  • Default: build into the checkout's own repo-local target/ directory (each worktree has its own; checkouts under /fast/projects/ are already on the fast disk, so this is both isolated and fast). No CARGO_TARGET_DIR override needed in the normal case.
  • If the repo-local target dir is locked/contended (another process holds the cargo build lock — "Blocking waiting for file lock on build directory" — or a concurrent agent owns the checkout), fall back to a cache target dir on the fast volume: CARGO_TARGET_DIR=/fast/cargo-target/<repo-or-worktree-name> (e.g. /fast/cargo-target/tracedecay-merge-check). Never place target dirs under /tmp, $HOME, or anywhere on the root disk.
  • Cargo-launched TraceDecay test data follows the active target dir: repo-local default → TRACEDECAY_DATA_DIR=target/test-profile/.tracedecay; fast-cache fallback → TRACEDECAY_DATA_DIR=<CARGO_TARGET_DIR>/test-profile/.tracedecay.
  • Run normal repo commands from the repo root: cargo check, cargo test, cargo test-all, cargo nextest run --workspace --no-fail-fast.
  • Toolchain caches (sccache, cargo registry) live under /fast/cache/ and need no per-agent changes.
  • CI is unchanged and keeps runner-local paths:
CARGO_TARGET_DIR="${RUNNER_TEMP:-/tmp}/tracedecay-cargo-target" \
TRACEDECAY_DATA_DIR="${RUNNER_TEMP:-/tmp}/tracedecay-test-profile/.tracedecay" \
cargo test-all