daily-fix: guard detached repo-root HEAD
kind: infra#wf-fix#wf-fix-fp:2207d7f784a5#daily-auto-filed
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Overview / Motivation
Auto-filed by the /daily three-route problem sweep (2026-06-30), route 2 (behavior/logic change → independent review pipeline).
Goal
Extend guard_repo_root_branch.sh to also refuse operations that would leave the repo-root HEAD detached (mirror the branch-switch guard), so a concurrent git worktree add --detach/bad recovery cannot detach the shared root.
Workflow gap
- Bug observed: When the repo-root main worktree is left with a detached HEAD, the task_workflow repo-root resolver crashes ('main worktree HEAD is detached; re-attach to main'), killing any task.py/self-report call in that session; the guard hook covers branch-SWITCH but not leaving HEAD detached.
- Evidence: 2026-06-30 (session_progress_report.py crash). Source: /daily miner batch 00.
- Confidence (emitter): medium
Scope / surfaces
- Primary target:
scripts/guard_repo_root_branch.sh - Grep the workflow surface for the pattern before editing and update every hit; list them in the plan.
Constraints / invariants
- Workflow-surface / code fix per the target; keep ruff + workflow_lint + the relevant tests green.
- The planner may deflect with a reasoned no-change report if the gap is already closed on main.
Provenance
- workflow_fix_target: scripts/guard_repo_root_branch.sh
- fingerprint: 2207d7f784a5
- source: /daily route-2 (2026-06-30)
Activity