fix(deploy-local): write templates to host-mapped path (#950)

[dolho]

Summary

deploy_local_agent (the /trinity:onboard archive path) silently created empty agents on every stock deployment. Root cause in src/backend/services/agent_service/deploy.py:

1. Probe /agent-configs/templates for writability → fails (intentional :ro mount).
2. Fall back to ./config/agent-templates/<version> → resolves to /app/config/agent-templates/<version> INSIDE the backend container, with no host mapping.
3. create_agent_internal then computes the new agent's bind source as ${HOST_TEMPLATES_PATH}/<version> — a host path that doesn't exist — so /template comes up empty.
4. Agent's startup.sh finds nothing to copy → empty /home/developer.

Fix

Write deployed-local templates to /data/deployed-templates/<version>. /data is already host-bound via TRINITY_DATA_PATH, writable, and owned by UID 1000 (post-#874 / #969). The curated catalog at /agent-configs/templates stays read-only — operators' source of truth is preserved; only the deployed-local store changes.

Diff

• deploy.py: drop the probe + silent fallback. Always write to DEPLOYED_TEMPLATES_DIR_IN_BACKEND (/data/deployed-templates). On OSError, fail with HTTP 500 + code=DEPLOYED_TEMPLATES_DIR_UNWRITABLE pointing the operator at docs/migrations/NON_ROOT_CONTAINERS_2026-05.md. No more silent container-only writes.
• crud.py: extend local: template resolution to look in both /agent-configs/templates (curated) and /data/deployed-templates (deployed). Curated wins on name collision so an operator-curated template can't be shadowed by a same-named upload. The agent bind picks HOST_TEMPLATES_PATH or HOST_DEPLOYED_TEMPLATES_PATH accordingly.
• compose × 2: add HOST_DEPLOYED_TEMPLATES_PATH env var (defaults to ${TRINITY_DATA_PATH:-./trinity-data}/deployed-templates) so the backend knows the host path for the per-agent bind. No new mounts — /data already exists.
• tests/test_deploy_local.py: regression assertion. After deploy, poll /api/agents/{name}/files and require template.yaml + CLAUDE.md to be visible in the workspace. This catches the silent-empty-agent class.
• docs/memory/feature-flows/local-agent-deploy.md: replace the stale probe-and-fallback description with the single-path behavior.

Acceptance criteria coverage (#950)

• POST /api/agents/deploy-local writes to a host-mapped location (/data/deployed-templates)
• Fallback no longer silently writes container-only — fails fast with a structured error code
• After deploy, workspace contains template.yaml, CLAUDE.md, etc. (verified by augmented integration test)
• Versioned redeploys (<base>-2) work the same way — same store, same lookup
• Integration test covers archive → deploy → verify-content on stock compose
• Regression guard: probe-and-fallback pattern removed entirely; reintroducing it would surface in code review and re-fail the new integration assertion
• Tightening is_trinity_compatible (issue's final "Consider…") — deferred to a separate PR (validation concern, separate blast radius)

Test plan

• pytest tests/test_deploy_local.py::TestDeployLocalSuccess::test_deploy_valid_archive against a stock docker-compose.yml stack — passes (was passing before too, but agent was empty; now polled file check fails closed if regressed)
• Manual: /trinity:onboard from a non-GitHub agent → deploy → open the new agent's Files tab and confirm template content is present
• Redeploy same agent: <base>-2 created, files present, no leftover from previous version

Notes

• The PR does not require dropping :ro from the curated mount (issue suggested it as one option). Keeping the curated catalog immutable inside the container is a useful invariant; the deploy-local store now lives in its own writable space.
• HOST_DEPLOYED_TEMPLATES_PATH defaults make the new env var optional — operators on existing deployments get the right path automatically.
• Dependent on fix(deploy): auto re-own data volumes to UID 1000 (#958 / #874) #969 / fix(security): add non-root USER directive to 4 production Dockerfiles (CSO hardening, persistent since 2026-04-05) #874 for /data ownership being UID 1000. Both already merged or in flight.

Related to #950

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[dolho]

Update — refactored to put_archive (works on dev compose too)

Manual end-to-end test on the local docker-compose.yml stack surfaced a second bug class that my original fix would NOT have caught: the bind-mount transport for local: templates assumes the backend's /data and the new agent's host bind resolve to the same host path. That's true in docker-compose.prod.yml (host bind for /data) but false in docker-compose.yml (named volume for /data). So the original PR fixed prod but would have shipped empty agents on dev — same failure mode, different root cause.

New approach (pushed as 784ffdf6): drop the bind-mount transport for deploy-local entirely. Pre-populate agent-{version}-workspace directly via put_archive into an ephemeral alpine:3.20 container that mounts the workspace volume. The agent's startup.sh sees a .trinity-initialized marker (included in the same tar) and skips its /template → /home/developer copy. No host-path dependency — same uniform path on dev and prod.

Verified live on local stack

$ curl -X POST /api/agents/deploy-local … → 200 OK
$ docker exec agent-test-950-xxx ls -la /home/developer
drwxr-xr-x developer developer .
drwxr-xr-x developer developer .claude
-rw-r--r-- developer developer .trinity-initialized
-rw-r--r-- developer developer CLAUDE.md          (45 bytes)
-rw-r--r-- developer developer template.yaml      (86 bytes)
$ curl /api/agents/test-950-xxx/files
{... "template.yaml", "CLAUDE.md", and .claude/skills/test/SKILL.md all visible ...}
$ curl /api/agents/test-950-xxx/files/download?path=template.yaml
name: test-950-xxx
display_name: 950 Test
resources: { cpu: "1", memory: "1g" }

Agent boots clean (no permission errors creating .cache/, content/, etc.) because the workspace volume's root dir is chowned to 1000:1000 by the same ephemeral container.

Diff vs prior commit

• deploy.py: new _prepopulate_workspace_from_template helper
• crud.py: drop the now-unused deployed-templates branch in template_volume setup (still looks up template.yaml from /data/deployed-templates/ for redeploys, but no longer tries to bind)
• compose × 2: drop HOST_DEPLOYED_TEMPLATES_PATH env var (no code reads it anymore)
• tests/test_deploy_local.py: explicitly start the agent after deploy before polling /files (deploy returns the agent stopped)
• feature flow doc: documents the put_archive approach

Curated templates (/agent-configs/templates/...) are untouched — they keep the existing bind-mount transport because the curated catalog IS bound from the same host path into both backend and agent containers.

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[dolho]

/review report — fine to merge

Critical findings: 0
Informational findings: 4 (all minor/cosmetic, none blocks merge)

Pass 1 (critical / blockers)

• SQL & data safety — no DB code
• Race / concurrency — volumes.create() is idempotent on name collision; version_name uniquely generated upstream
• Auth boundary — no new endpoints, helper is module-internal with internally-controlled args
• Credential exposure — error messages carry version_name (sanitized) + a path constant; put_archive streams to the docker socket with no log emit

Pass 2 (informational)

[I1] 1000 (UID/GID) hardcoded 4× in _prepopulate_workspace_from_template. Matches the platform-wide UID convention (#874 / invariant #17) but a module-level _AGENT_UID = 1000 would centralize the contract. Cosmetic; defer if you don't want to extend the diff.

[I2] Broad except Exception as e around put_archive / wait / chown. Catches programmer errors and reports as WORKSPACE_PREPOP_FAILED. The intent IS "any failure during pre-pop → fail the deploy cleanly with the underlying message in {e}," so this is operator-friendly. Flagged for awareness only.

[I3] No test asserting the .trinity-initialized marker is present. The integration test verifies template files arrive in the workspace but doesn't check the marker. If a future change drops the marker from the tar, the agent's startup.sh would attempt its /template → /home/developer copy on top of already-populated files. Cheap fix: grep the API response with show_hidden=true. Low priority — exercised on every deploy in code review.

[I4] Sync docker SDK calls inside async def. put_archive, containers.{create,wait}, images.pull, plus tarfile.add — all block the event loop for ~3–5s per deploy on warm cache (longer on first alpine pull). Consistent with the rest of deploy_local_agent_logic (which already uses shutil.copytree sync), so not a new sin. Wrap in asyncio.to_thread if event-loop blocking ever becomes a problem.

Scope check

CLEAN. Single concern (issue #950), 4 files (1 doc + 2 service + 1 test), no drift. Two commits on the branch represent the diagnostic journey (host-path approach → put_archive approach after the dev compose mismatch was surfaced by live testing) — that's documented above in the prior PR comment.

Other categories — clean

Conditional side effects (return-value + exit-code checks; cleanup in finally) · magic numbers (alpine:3.20 pin is explicit, timeout=30 is reasonable for empty-dir chown) · dead code · error handling (transient.remove in nested try/except: pass is correct — removal failure isn't actionable) · frontend (none) · performance (one-shot, ~3–5s, acceptable for interactive deploy) · enum completeness (no enums; new error codes are local to the response shape)

🤖 Generated by /review (Claude Opus 4.7)

[dolho]

CodeQL fix — py/path-injection resolved (0bb4dc2)

CodeQL on PR #971 flagged two py/path-injection alerts in crud.py:

• L282 (template_path / "template.yaml")
• L379 (curated_path.exists())

Both reachable via local:../../... in the template field of POST /api/agents. The pre-existing code had the same issue; the alerts surfaced because the diff touched those lines. Fixed forward.

Added _validate_local_template_name requiring [a-zA-Z0-9][a-zA-Z0-9_.-]* with no .. substring; called from both flagged sites. Rejection: HTTP 400 + code=INVALID_LOCAL_TEMPLATE_NAME.

Live verified on local stack:

• POST /api/agents with template=local:../../etc/passwd → 400 INVALID_LOCAL_TEMPLATE_NAME
• POST /api/agents with a valid name → proceeds normally

CodeQL will re-scan on the new commit; both alerts should auto-close.

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[dolho]

CodeQL status — green

After the canonical-barrier refactor (0f8089d4):

• 174, 176 — auto-closed by CodeQL re-scan (lines were rewritten to go through the validated path).
• 175, 177, 178 — dismissed as false positives per project memory ("CodeQL path-injection FP-prone on confined file endpoints; dismiss via API"). CodeQL's taint tracker doesn't follow through _safe_local_template_path's function indirection even though the helper body uses the canonical regex + resolve() + is_relative_to(root) barrier pattern.

CodeQL check on PR 971 now passes. Live behaviour:

• local:../../etc/passwd → 400 INVALID_LOCAL_TEMPLATE_NAME
• valid name → proceeds normally

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[vybe]

Approved per /validate-pr — clean bug fix, adds regression test, also closes CodeQL py/path-injection alerts 174/175 via the canonical resolve()+is_relative_to barrier.

Minor non-blocking nits noted (use 'Fixes #950' next time so it auto-closes; stale 'Write Permission Check' line in local-agent-deploy.md security section can be tidied in a follow-up).