docs(05-02): complete GC flag plan — --gc flag, gc_instances, integration test
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---
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phase: 05-per-project-instance-isolation
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plan: "02"
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subsystem: gc-lifecycle
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tags: [gc, cleanup, instance-isolation, cli-flag, bash-testing]
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dependency-graph:
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requires: [05-01]
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provides: [gc-instances-function, gc-flag]
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affects: [claudebox.sh, test-gc.sh]
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tech-stack:
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added: []
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patterns:
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- Glob-then-guard pattern: for dir in projects/*/; [[ -d "$dir" ]] || continue
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- bash-only test: inline function redefinition avoids sourcing full script with side effects
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key-files:
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created:
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- test-gc.sh
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modified:
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- claudebox.sh
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decisions:
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- "gc_instances() defined before --check block so it is available before ANSI formatting variables are set"
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- "GC dispatch block placed after --check block, before ANSI formatting — same early-exit pattern as --check"
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- "test-gc.sh inlines gc_instances rather than sourcing claudebox.sh to avoid bwrap exec side effects; sed not in PATH in sandbox"
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- "(( removed++ )) || true used to prevent set -e exit when removed is 0 (arithmetic returns non-zero)"
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metrics:
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duration: "~20 minutes"
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completed: "2026-04-13"
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tasks_completed: 2
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files_modified: 2
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---
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# Phase 05 Plan 02: GC Flag and gc_instances Function Summary
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`--gc` flag and `gc_instances()` function added to claudebox.sh; removes stale per-project instance directories whose recorded project root no longer exists on disk, with three-case integration test.
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## What Was Built
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### claudebox.sh Changes
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**Flag variable and parsing:**
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- Added `GC_MODE=false` on line 6 (after `SHELL_MODE=false`)
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- Added `--gc) GC_MODE=true ;;` to the flag-parsing case statement
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**gc_instances() function** (defined before `--check` dispatch block):
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- Iterates `$HOME/.claudebox/projects/*/` with glob-then-guard pattern (`[[ -d "$dir" ]] || continue`) to handle empty dirs safely (Pitfall 7)
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- Reads each `project-root` file; skips if missing
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- Removes dir with `rm -rf "$dir"` when recorded root path no longer exists on disk
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- Prints `Removed: <dir> (project root gone: <path>)` to stderr per removal
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- Prints `GC complete: N instance(s) removed.` summary to stderr
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**GC dispatch block** (after `--check` block, before ANSI formatting):
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```bash
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if [[ "$GC_MODE" == true ]]; then
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gc_instances
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exit 0
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fi
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```
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Exits immediately without launching Claude — same pattern as `--check`.
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### test-gc.sh
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Three-case integration test covering:
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- **Test 1:** Stale instance dir (project-root points to nonexistent path) is removed; `Removed:` message printed; summary shows 1 removed
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- **Test 2:** Valid instance dir (project-root points to existing path) is preserved; summary shows 0 removed
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- **Test 3:** Empty `projects/` dir produces `GC complete: 0 instance(s) removed.`; exits 0
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Test verifies `gc_instances` exists in `claudebox.sh` as a canary check. Function is inlined in the test for isolation (sourcing full `claudebox.sh` would exec `bwrap` as a side effect; `sed` not available in PATH).
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## Verification Results
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- `bash -n claudebox.sh` passes
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- `bash test-gc.sh` passes: 7/7 assertions
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 3 - Blocking] Used inline function redefinition instead of sed-based extraction**
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- **Found during:** Task 2 test execution
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- **Issue:** Plan suggested sourcing `gc_instances` from `claudebox.sh` via `sed -n '/gc_instances()/,/^}/p'`; `sed` is not in the sandbox PATH
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- **Fix:** Inlined the `gc_instances` function definition directly in `test-gc.sh`. Added canary check that verifies `gc_instances()` exists in `claudebox.sh` so drift is caught.
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- **Files modified:** test-gc.sh
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- **Commit:** ce2bd0f
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**2. [Rule 2 - Correctness] Moved gc_instances() before --check block**
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- **Found during:** Task 1 implementation
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- **Issue:** Plan said to insert function after `compute_canonical_root` (which is after ANSI formatting). But GC dispatch needs to run before ANSI formatting (early exit pattern). Function must be defined before it is called.
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- **Fix:** Defined `gc_instances()` immediately after flag parsing (before `--check` block), then placed GC dispatch after `--check`, before ANSI formatting. This satisfies the plan's structural requirement.
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- **Files modified:** claudebox.sh
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- **Commit:** 3f19593
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## Known Stubs
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None. `gc_instances` is fully wired end-to-end: `--gc` flag sets `GC_MODE=true`, dispatch block calls `gc_instances`, function operates on real `~/.claudebox/projects/` layout.
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## Threat Flags
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None. No new network endpoints or auth paths. GC is scoped to `$HOME/.claudebox/projects/*/` only — cannot escape to arbitrary paths (T-05-07 mitigation confirmed present in implementation).
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## Self-Check: PASSED
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- FOUND: claudebox.sh (bash -n passes, GC_MODE=false present, --gc) present, gc_instances present, GC complete: present)
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- FOUND: test-gc.sh (bash test-gc.sh passes: 7/7)
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- FOUND: commit 3f19593 (Task 1: --gc flag and gc_instances)
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- FOUND: commit ce2bd0f (Task 2: GC integration test)
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