chore(daemon): make daemon diagnostics name real paths, ratchet six sites

[zackees]

Third ratchet batch for #1349. Allowlist 39 → 33; fbuild-daemon is now
clear.

Two diagnostics pointed at paths that do not exist

Both messages that send a user to the daemon log spelled it by hand, and both
spelled it wrong:

message	what it said	why it's wrong
build worker died	~/.fbuild/daemon/daemon.log	drops the dev/prod segment entirely
project lock not acquired	~/.fbuild/<env>/daemon/daemon.log	<env> reads as a PlatformIO environment; the segment is the dev/prod mode

Someone reading the second one is already debugging a build that will not
start, and the message hands them a path that isn't there.

Both now print fbuild_paths::get_daemon_log_file() — an absolute path rather
than a template the reader has to expand and get right. The
embedded-zccache startup failure gets the same treatment for its cache
directory (get_fbuild_root().join("zccache")).

This is precisely the drift the ratchet exists for: nothing tests a message
string, so a hand-spelled path goes on compiling and being wrong
indefinitely. The new test asserts against get_daemon_log_file() rather than
against a literal — a literal is what drifted in the first place — and
explicitly checks the mode segment the old spelling dropped.

Also ratcheted

• emulator/tests_process.rs built <project>/.fbuild/build-qemu directly
  instead of asking get_project_fbuild_dir. Production path construction,
  not a message.
• libraries.rs's install-state note (shown on the Library Manager page)
  described the build layout in a const &str. It is assembled from
  FBUILD_DIR_NAME / BUILD_DIR_NAME now, so a note that disagrees with the
  layout cannot outlive a layout change.
• models.rs and legacy_daemon_transition.rs fixtures spelled the segment
  by hand.

Verification

• dylint --lib ban_raw_fbuild_path -- -p fbuild-daemon --all-targets: exit 0
  with all six entries removed.
• soldr cargo test -p fbuild-daemon --lib: 244 passed, 0 failed.
• clippy -D warnings: clean.

Remaining

33 entries: fbuild-build 12, fbuild-build-engine 10, fbuild-cli 9, plus the 2
sanctioned definition sites. fbuild-cli deliberately sat out this batch —
cli/args.rs is also touched by #1384, and I would rather not create a
conflict between two open ratchet-adjacent PRs.

Summary by CodeRabbit

• Bug Fixes

  • Improved path resolution for build directories, cache locations, and daemon logs.
  • Updated installation and startup messages to display correct runtime paths.
  • Improved diagnostics for worker termination and lock-wait conditions.

• Tests

  • Updated emulator and daemon fixtures to use resolved project paths.
  • Added coverage for dynamically resolved paths and messages.

• Chores

  • Updated path validation tooling and removed obsolete path exceptions.

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• crates/fbuild-daemon/src/handlers/libraries.rs

📝 Walkthrough

Walkthrough

The daemon now resolves build, library, log, zccache, and fixture paths through canonical fbuild path definitions. Diagnostics and installation notes use resolved paths. Tests and the path-lint crate were updated to remove duplicated path literals.

Changes

Canonical fbuild path usage

Layer / File(s)	Summary
Runtime path resolution crates/fbuild-daemon/src/handlers/emulator/tests_process.rs, crates/fbuild-daemon/src/handlers/libraries.rs, crates/fbuild-daemon/src/main.rs	Test subprocesses use /bin/sh on non-Windows systems. Build overrides, installation notes, daemon log references, and zccache errors now use resolved or canonical fbuild paths.
Diagnostic path reporting crates/fbuild-daemon/src/handlers/operations/build.rs	Worker-termination and lock-wait diagnostics now report the resolved daemon log path. Tests verify mode-specific paths and generated messages.
Fixture and test path alignment crates/fbuild-daemon/src/models.rs, crates/fbuild-daemon/tests/legacy_daemon_transition.rs, dylints/ban_raw_fbuild_path/Cargo.toml	Test fixtures use FBUILD_DIR_NAME. The path-lint crate version is updated. Legacy test paths use the canonical directory constant.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 07996

The change fixes several hard-coded diagnostic paths, but the generic installation-state message can still show a different directory when FBUILD_BUILD_DIR is configured. This is a bounded user-facing correctness issue and is mergeable with explicit owner follow-up.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: real daemon paths in diagnostics and removal of six raw fbuild path usages.
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@crates/fbuild-daemon/src/handlers/libraries.rs`:
- Around line 47-58: Update install_state_note and its caller to account for
BuildLayout’s auto-collapsed environment segment: either mention that <env> is
omitted when it matches the project basename, or generate the displayed path
from the resolved layout used by list_libraries. Ensure the note always
describes the actual release libs directory checked by the handler.

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• crates/fbuild-daemon/src/handlers/emulator/tests_process.rs
• crates/fbuild-daemon/src/handlers/libraries.rs
• crates/fbuild-daemon/src/handlers/operations/build.rs
• crates/fbuild-daemon/src/main.rs
• crates/fbuild-daemon/src/models.rs
• crates/fbuild-daemon/tests/legacy_daemon_transition.rs
• dylints/ban_raw_fbuild_path/Cargo.toml
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Actionable comments posted: 1

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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

Inline comments:
In `@crates/fbuild-daemon/src/handlers/libraries.rs`:
- Around line 59-66: Update install_state_note to account for the
FBUILD_BUILD_DIR override when rendering the generic libraries directory, so
parse and environment-resolution errors describe the effective configured root
rather than always showing the default .fbuild/build path. Preserve the existing
default layout and add coverage for FBUILD_BUILD_DIR.

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[zackees]

@coderabbitai review

Both threads you opened are now resolved and all 94 checks pass. The CHANGES_REQUESTED verdict is from 21:10, before the FBUILD_BUILD_DIR fix.

Disposition of the two findings:

1. Auto-collapsed <env> segment — install_state_note now takes the resolved libs_dir on the paths that have one and names it exactly; the generic form states the collapse rule.
2. FBUILD_BUILD_DIR override — the generic form now follows the override when set and names it as a possibility when not, since get_project_build_root returns it verbatim and the default segments are then absent entirely.

Also verified locally that this branch rebased onto current main keeps the dylint gate green — worth checking explicitly rather than inferring from file lists, because an allowlist shrink is validated against whatever code exists at merge time, not against the code its own CI ran on.

Addressed in 27da216 — install_state_note now takes the resolved libs_dir and names it exactly; the generic form states the collapse rule. The thread from this review is resolved.

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '== PR status and checks =='
gh pr view 1387 --repo FastLED/fbuild \
  --json number,headRefOid,mergeStateStatus,reviewDecision,statusCheckRollup \
  --jq '{number, headRefOid, mergeStateStatus, reviewDecision, checks: [.statusCheckRollup[] | {name, status, conclusion}]}'

echo
echo '== Changed files =='
git diff --name-status origin/main...HEAD

echo
echo '== Changed diff =='
git diff --unified=80 origin/main...HEAD -- \
  crates/fbuild-daemon/src/handlers/libraries.rs \
  crates/fbuild-daemon/src/handlers/operations/build.rs \
  crates/fbuild-daemon/src/handlers/emulator/tests_process.rs \
  crates/fbuild-daemon/src/main.rs \
  crates/fbuild-daemon/src/models.rs \
  crates/fbuild-daemon/tests/legacy_daemon_transition.rs \
  dylints/ban_raw_fbuild_path/Cargo.toml \
  dylints/ban_raw_fbuild_path/src/allowlist.txt

echo
echo '== Symbol outlines =='
ast-grep outline crates/fbuild-daemon/src/handlers/libraries.rs --items all --type function --match 'install_state_note|library' || true
ast-grep outline crates/fbuild-daemon/src/handlers/operations/build.rs --items all --type function --match 'daemon|worker' || true

echo
echo '== Relevant path helper definitions and call sites =='
rg -n -C 4 \
  'fn\s+(install_state_note|get_project_build_root|get_project_fbuild_dir|get_fbuild_root|get_daemon_log_file)\b|install_state_note\s*\(|get_project_build_root\s*\(' \
  crates dylints

echo
echo '== Current daemon allowlist entries =='
rg -n -C 2 'fbuild-daemon|\.fbuild|build-qemu|libdeps' dylints/ban_raw_fbuild_path/src/allowlist.txt || true

Length of output: 110183

---

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '== BuildLayout implementation =='
ast-grep outline crates/fbuild-paths/src/lib.rs --items all --type impl,function --match 'BuildLayout|get_project_build_root'
sed -n '220,340p' crates/fbuild-paths/src/lib.rs

echo
echo '== Raw fbuild path lint matching behavior =='
ast-grep outline dylints/ban_raw_fbuild_path/src/lib.rs --items all --type impl,function
sed -n '1,220p' dylints/ban_raw_fbuild_path/src/lib.rs

echo
echo '== Raw .fbuild literals in changed daemon files =='
rg -n -C 2 --fixed-strings '.fbuild' \
  crates/fbuild-daemon/src/handlers/emulator/tests_process.rs \
  crates/fbuild-daemon/src/handlers/libraries.rs \
  crates/fbuild-daemon/src/handlers/operations/build.rs \
  crates/fbuild-daemon/src/main.rs \
  crates/fbuild-daemon/src/models.rs \
  crates/fbuild-daemon/tests/legacy_daemon_transition.rs || true

echo
echo '== FBUILD_BUILD_DIR assumptions outside fbuild-paths =='
rg -n -C 3 'FBUILD_BUILD_DIR' crates dylints

Length of output: 1361

---

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '== BuildLayout implementation =='
rg -n -C 12 \
  'pub fn get_project_build_root\b|pub struct BuildLayout\b|impl BuildLayout\b|pub fn resolve\b' \
  crates/fbuild-paths/src/lib.rs
sed -n '220,360p' crates/fbuild-paths/src/lib.rs

echo
echo '== Raw fbuild path lint matching behavior =='
sed -n '1,240p' dylints/ban_raw_fbuild_path/src/lib.rs

echo
echo '== Raw .fbuild literals in changed daemon files =='
rg -n -C 2 --fixed-strings '.fbuild' \
  crates/fbuild-daemon/src/handlers/emulator/tests_process.rs \
  crates/fbuild-daemon/src/handlers/libraries.rs \
  crates/fbuild-daemon/src/handlers/operations/build.rs \
  crates/fbuild-daemon/src/main.rs \
  crates/fbuild-daemon/src/models.rs \
  crates/fbuild-daemon/tests/legacy_daemon_transition.rs || true

echo
echo '== FBUILD_BUILD_DIR assumptions outside fbuild-paths =='
rg -n -C 3 'FBUILD_BUILD_DIR' crates dylints

Length of output: 38942

---

@zackees I found one remaining diagnostic mismatch.

• Medium — FBUILD_BUILD_DIR="" is treated as unset in the generic note. In crates/fbuild-daemon/src/handlers/libraries.rs Line 84, the !root.trim().is_empty() guard selects the default-path description for an empty value. In contrast, fbuild_paths::BuildLayout::resolve() treats every successful FBUILD_BUILD_DIR lookup as an override. With FBUILD_BUILD_DIR="", it resolves libs_dir as the relative <env>/release/libs path. The error response then names <project>/.fbuild/build/... instead. Handle every Ok(root) value as an override, or change the shared path helper to reject empty overrides. Add an empty-value test beside the_generic_note_follows_the_build_dir_override.

The reported CI checks are successful. The Dylint check passed on the current PR head. The daemon files no longer have allowlist entries.

---

✏️ Learnings added

Learnt from: zackees
URL: https://github.com/FastLED/fbuild/pull/1387

Timestamp: 2026-08-23T22:38:00.042Z
Learning: In FastLED/fbuild, the `ban_raw_fbuild_path` allowlist is validated against the code at the branch state that merges. When a pull request decreases the allowlist, verify the Dylint gate after a rebase onto current main instead of inferring validity from the pull request's earlier CI run.

Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.

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