apply_isolation previously mutated docker-compose.local.yml and
local-ports.json in-place with .iso-bak backups. If the process crashed
the originals stayed corrupted with +200 port offsets, breaking all
subsequent showcase commands.
Now writes modified copies to a temp directory and overrides
COMPOSE_FILE/PORTS_FILE shell variables so downstream code reads from
the overlay. Originals are never touched. restore_isolation just removes
the temp dir.
Also replaces hardcoded +200 port offset with atomic mkdir-based slot
allocation. Two parallel --isolate runs now get different port ranges
(slot 0 = +200, slot 1 = +400, etc.) instead of colliding on the same
ports. Container names include the slot number for collision-free Docker
naming. Stale slots from crashed runs are reclaimed via PID liveness
checks and a 2-hour age fallback.
TS harness files (config.ts, lifecycle.ts, doctor.ts) honor
LOCAL_PORTS_FILE env var so they read offset ports from the temp overlay.
When passed to `showcase test`, creates an isolated Docker Compose
project with offset ports (+200) and renamed containers, allowing
multiple agents/sessions to run showcase tests simultaneously without
container conflicts.
Usage:
showcase test agno --d5 --isolate # auto-names isolate-<PID>
showcase test agno --d5 --isolate d5verify # explicit name
Jordan Ritter