fix(asusctl): dynamically resolve D-Bus object path for Slash and XGM LED interfaces

[scardracs]

Description

Fixes an unhandled D-Bus UnknownInterface: Unknown interface 'xyz.ljones.Slash' error when executing asusctl slash set or asusctl slash get.
Previously, slash_cli.rs and xgm_led_cli.rs used static proxy initialization (SlashProxyBlocking::new(&conn)), which directed D-Bus method calls to a hardcoded default path (/xyz/ljones). However, asusd exports SlashZbus dynamically under /org/asuslinux/aura/slash via D-Bus ObjectManager. This caused asusctl slash commands to fail even on supported hardware models with Slash lighting (e.g. ROG Zephyrus G14 GA403), whereas rog-control-center succeeded because it resolved the object path dynamically using find_iface_async.

Summary of Changes:

• Added find_iface_blocking<T>(iface_name: &str) helper function to rog-dbus (synchronous counterpart to find_iface_async).
• Updated slash_cli.rs and xgm_led_cli.rs to resolve proxy object paths dynamically via find_iface_blocking.
• Removed redundant local find_iface helper in asusctl/src/main.rs.
• Replaced internal library println! logs with structured log::warn!.
• Added deduplication and sorting to list_iface_blocking().
  Fixes N/A

Tested Hardware & Environment N/A

Verification and testing:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My code follows the style guidelines of this project (cargo fmt --all -- --check)
• My changes generate no new warnings (cargo clippy --all -- -D warnings/cargo check --all-targets)
• New and existing unit tests pass locally with my changes (cargo test --all)
• Cranky with 0 warning (cargo cranky)

Closes: #269

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Improvements
  • Improved device and feature detection across supported hardware interfaces.
  • Slash and XGM LED commands now apply consistently when multiple matching devices are connected.
  • Interface results are sorted, deduplicated, and reported more consistently.
  • Improved handling of multiple-device configurations and connection scenarios.
  • Enhanced reliability for Aura, backlight, Anime, and Armoury Crate-related controls.
  • Improved consistency when discovering and controlling supported hardware features.

Walkthrough

The change centralizes blocking D-Bus interface discovery in rog-dbus. Main, Slash, and XG LED CLI operations now use the shared helper and process all matching interfaces.

Changes

D-Bus discovery migration

Layer / File(s)	Summary
Shared blocking discovery helper rog-dbus/Cargo.toml, rog-dbus/src/lib.rs	rog-dbus adds find_iface_blocking, sorts and deduplicates interface results, and logs multiple matches.
Main CLI proxy migration asusctl/src/main.rs	Main CLI operations use the shared helper for Aura, Backlight, Anime, ScsiAura, and AsusArmoury interfaces.
Slash and XG LED migration asusctl/src/slash_cli.rs, asusctl/src/xgm_led_cli.rs	Slash and XG LED operations discover all matching interfaces and apply actions to each proxy.

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

Possibly related PRs

• OpenGamingCollective/asusctl#211: Extends the centralized D-Bus discovery refactor.
• OpenGamingCollective/asusctl#238: Modifies find_iface_blocking and its callers.
• OpenGamingCollective/asusctl#240: Updates D-Bus discovery helpers and blocking consumers.

Suggested labels: asusctl, rog-slash, xgmled, fix

Suggested reviewers: neroreflex

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly identifies the dynamic D-Bus object path fix for Slash and XGM LED interfaces.
Description check	✅ Passed	The description explains the issue, summarizes the changes, identifies testing status, and links the related issue.

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_{Comment @coderabbitai help to get the list of available commands.}

[Ariel-Inacio]

This change works, it is now possible to enable and disable the slash bar via asusctl on the G14 (GA403UI) without errors.

20260804_185532.mp4

[scardracs]

@coderabbitai full review

[coderabbitai]

✅ Action performed

Full review finished.

[coderabbitai]

Note

GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer.