hil: drop the udev automount-exclusion checks; the farm has no automounter by hathach · Pull Request #647 · adafruit/tinyuf2

hathach · 2026-11-11T17:26:59Z

Problem

The runner refuses a board unless a per-serial ENV{UDISKS_IGNORE}="1" udev line exists (exclusion_configured, before the lock) and the enumerated drive carries that property (check_exclusive, in the dfu step). The ci.lan farm installs those lines from agentrc's hil-farm-setup/scripts/udev/99-tinyuf2-hil.rules, but ci.lan runs no automounter (no udisks2, udiskie, gvfs, autofs or usbmount), so the file protects nothing there and every new farm board needs an agentrc change just to pass the check.

Solution

Drop exclusion_configured, udisks_ignored and the UDISKS_IGNORE wait. check_block keeps the mounted-drive refusal, now after a bounded wait (same UDEV_TIMEOUT, within the dfu deadline) for read-write access to the node: the property wait also covered udev applying the access rule after the node shows in sysfs.
commissioning.md: a host that automounts (htpc) keeps a hand-written exclusion line, checked by hand; the runner verifies neither. The ci.lan bullet names agentrc hil-farm-setup's access file, replacing the stale homelab path.
The farm's file goes in hil-farm-setup: retire tinyuf2's automount-exclusion rules; the farm has no automounter hathach/agentrc#532. Deploy it only after this merges: a branch without this change still requires the installed file.

Validation

Script tests: test_hil.py 366 passed serially; full suite passes in pre-commit. check_build.py --base origin/master --worktree passes.
ci.lan, hil_remote.py run -b imxrt1064_evk from this branch (run 20261112-002327-b661b9): pass, all five steps and cleanup; the access wait was 0.0 s on both DFU entries.

…unter

coderabbitai · 2026-11-11T17:27:13Z

Walkthrough

The HIL runner no longer requires a matching udev exclusion rule. It waits for block-device read/write access and refuses mounted devices. The skill and commissioning guidance describe host-specific automount rules and update the instructions for farm-managed access rules.

Changes: HIL runner and host guidance

Layer / File(s)	Summary
Block-device checks and validation `.claude/skills/hil-contract/scripts/hil_test.py`, `.claude/test/test_hil.py`	The runner adds a bounded read/write access check and refuses mounted devices. The DFU flow limits the check to the remaining timeout. Tests cover access polling, mounted devices, and timeout behavior.
Host-specific HIL guidance `.claude/skills/hil-contract/commissioning.md`, `.claude/skills/hil-contract/SKILL.md`	Commissioning guidance limits automount exclusion rules to hosts with automounters and updates the `ci.lan` access-rule instructions. The skill instructions no longer list an exclusion rule as a prerequisite for running or manual installation.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Possibly related PRs

adafruit/tinyuf2#618: Moves ci.lan board-exclusion and access rules into farm-managed configuration, which this PR’s HIL access guidance also addresses.
adafruit/tinyuf2#591: Adds the runner’s check_exclusive automount check, which this PR removes and replaces with a bounded access check.
adafruit/tinyuf2#586: Defines the HIL drive-access prerequisite that this PR changes to a bounded read/write access check.

Merge Risk: Low · up to 4f52f

The runner no longer verifies udev exclusion. The commissioning procedure for automounting hosts should say to disable the automounter during the exclusion proof so a mount cannot interfere with the raw read. The farm host has no automounter, so impact is limited to commissioning other hosts.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main change: removing udev automount-exclusion checks because the farm has no automounter.
Description check		The description directly explains the problem, solution, documentation updates, deployment dependency, and validation for the changeset.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 12 functions across 2 files. (1 skipped: 1 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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greptile-apps · 2026-11-11T17:29:13Z

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge with no actionable new findings.

Summary

Removes the runner’s automatic automount-exclusion checks.

The HIL runner checks drive access and mounts instead of requiring udev exclusion rules.

No actionable new issues were found in the changes since the previous review.

_{Reviews (2) · Last reviewed commit: "hil: restore the VID-wide rule caveat an..." · Reviewed by Greptile}

coderabbitai

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Failed pre-merge checks:
- Docstring Coverage:
Write docstrings for the functions missing them to satisfy the coverage
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Review info

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Repository: adafruit/tinyuf2

Branch: hil-drop-udisks-rule

File: .coderabbit.yaml

Commit: 5241174

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Run ID: `15f2ba17-54b4-42d3-8866-ac4bd8ba6caf`

Commits

Reviewing files that changed from the base of the PR and between `3b82efd` and `5241174`.

Files selected for processing: 4

`.claude/skills/hil-contract/SKILL.md`

`.claude/skills/hil-contract/commissioning.md`

`.claude/skills/hil-contract/scripts/hil_test.py`

`.claude/test/test_hil.py`

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hathach · 2026-11-11T17:32:40Z

#647 (review)

The docstring-coverage check flags no real gap:

check_block (.claude/skills/hil-contract/scripts/hil_test.py:1386) is the only non-test function this diff adds, and it has a docstring.
The other counted functions are unittest methods and local fakes in .claude/test/test_hil.py, such as test_access_gets_a_bounded_wait and flaky. The suite leaves these undocumented on purpose, because the test name states the behaviour under test.
The repo has no docstring threshold, and its style rule is to comment only where the code cannot say it itself.

github-actions · 2026-11-11T17:50:54Z

Hardware-in-the-loop (HIL) Test Report

ci.json (ci.lan)

PR head 4f52f5d · tested 9616a44 · run 43077431333, attempt 1

Every roster board: the HIL runner or a roster changed (8 boards).

✅ 7 passed · ⚪ 1 not run · HIL driver elapsed 11m11s

Board	install	dfu	copy	app-ran	reenter	recopy	blinky	admit	run
`espressif_esp32s3_devkitm_1`	✅	✅	✅	✅	✅	✅	✅	0s	2m18s
`espressif_p4_function_ev`	✅	✅	✅	✅	✅	✅	✅	0s	2m23s
`imxrt1064_evk`	✅	✅	✅	✅	✅	—	✅	0s	40s
`lpcxpresso55s69`	✅	✅	✅	✅	✅	—	✅	0s	1m31s
`max32666fthr`	❌					—		1s	1s
`metro_m4_express`	✅	✅	✅	✅	✅	—	✅	0s	1m33s
`stm32f407disco`	✅	✅	✅	✅	✅	—	✅	0s	2m15s
`stm32h743nucleo`	✅	✅	✅	✅	✅	—	✅	0s	29s

✅ passed · ❌ failed · blank not run · — not in this board's run · run time includes lock wait and blinky

max32666fthr install: the openocd flash failed (exit 1) (nothing written)

Records, reports and logs

…re, round its timeout

…on proof

Dismissed because a newer commit was pushed; Greptile will re-review the current head.

coderabbitai

Actionable comments posted: 1

Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix all issues

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
Review comments at @.claude/skills/hil-contract/commissioning.md:
- Line 26: Update the “Exclusion proof” instructions to require disabling the
automounter before deleting the temporary rule and reloading, keeping it
disabled through the install reset and manual check that the enumerated block
device has UDISKS_IGNORE=1, and re-enabling it only after that check passes.

---

Failed pre-merge checks:
- Docstring Coverage:
Write docstrings for the functions missing them to satisfy the coverage
threshold.

After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr

Review info

Run configuration

Source mode: Auto

Repository: adafruit/tinyuf2

Branch: hil-drop-udisks-rule

File: .coderabbit.yaml

Commit: 4f52f5d

Layers: Repository YAML

Review profile: CHILL

Plan: Advanced

Run ID: `88ed64df-b46c-48fe-adb9-c5af0601926c`

Commits

Reviewing files that changed from the base of the PR and between `5241174` and `4f52f5d`.

Files selected for processing: 3

`.claude/skills/hil-contract/commissioning.md`

`.claude/skills/hil-contract/scripts/hil_test.py`

`.claude/test/test_hil.py`

Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review.

hathach · 2026-11-11T18:51:59Z

#647 (review)

This is the same docstring-coverage check as on the previous review:

.coderabbit.yaml configures no docstring threshold.
The repo's rules say to comment only where the code cannot say it itself.
check_block, the one function this PR adds, already has a docstring (hil_test.py:1386).

hil: drop the udev automount-exclusion checks; the farm has no automo…

5241174

…unter

greptile-apps Bot previously approved these changes Nov 11, 2026

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hathach mentioned this pull request Nov 11, 2026

hil-farm-setup: retire tinyuf2's automount-exclusion rules; the farm has no automounter hathach/agentrc#532

Merged

coderabbitai Bot reviewed Nov 11, 2026

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coderabbitai Bot approved these changes Nov 11, 2026

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hathach mentioned this pull request Nov 11, 2026

HIL: max32666fthr's openocd flash fails on the ci.lan farm, so hil-run goes red #645

Open

hathach added 2 commits November 12, 2026 01:05

hil: prove the exclusion with DFU up, name check_block's access failu…

e7b7392

…re, round its timeout

hil: restore the VID-wide rule caveat and reentry flag in the exclusi…

4f52f5d

…on proof

greptile-apps Bot approved these changes Nov 11, 2026

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coderabbitai Bot requested changes Nov 11, 2026

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Comment thread .claude/skills/hil-contract/commissioning.md Resolved

coderabbitai Bot approved these changes Nov 11, 2026

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hathach merged commit 0200ec8 into master Nov 11, 2026
29 of 30 checks passed

hathach deleted the hil-drop-udisks-rule branch November 11, 2026 19:00

hathach mentioned this pull request Nov 11, 2026

Take HIL board locks through hil_lock.board_task and flash max32666fthr over J-Link #648

Merged

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hil: drop the udev automount-exclusion checks; the farm has no automounter - #647

hil: drop the udev automount-exclusion checks; the farm has no automounter#647
hathach merged 3 commits into
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Hardware-in-the-loop (HIL) Test Report

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