Round 15 audit cleanup. Three production paths were discarding
process / filesystem errors via bare 'let _ = ...'. Each silently
swallowed the error and the caller had no way to know the cleanup
failed — leading to zombie children (greeter), stale active-profile
symlinks (netctl), or unreaped USB device drivers (hotplugd).
1. local/recipes/system/redbear-greeter/source/src/main.rs — the
kill_child() helper now logs on kill() and wait() failure (with
debug-level success log) instead of 'let _ = process.kill();
let _ = process.wait();'. A failing kill() now produces an
eprintln so the operator sees it; wait() outcome is logged
at debug level.
2. local/recipes/system/redbear-netctl/source/src/main.rs — both
'let _ = fs::remove_file(active_profile_path());' sites (line 201
in stop_profile and line 224 in disable_profile) now log on
failure via eprintln. A failed remove_file previously left a
dangling 'active' symlink that subsequent boot would re-activate
silently.
3. local/recipes/system/redbear-usb-hotplugd/source/src/main.rs —
the 'if let Some(ref mut child) = dev.child { let _ = child.kill(); }'
in the disconnect path now logs on kill() failure (log::warn) so
a leaked USB driver child produces a visible warning.
Found by the Round 14 audit (local/docs/3D-DESKTOP-COMPREHENSIVE-PLAN.md §10).
Runtime log output is user-visible system surface; cross-references to
other operating systems belong in code comments and commit messages
(per project convention), not in runtime logs. The debounce parameters
and the comment-level references stay unchanged.
usb-core spawn.rs:
- class_driver_for_usb_class() extended to cover all Red Bear class drivers:
Audio(0x01)→redbear-usbaudiod, CDC ACM(0x02/0x02)→redbear-acmd,
CDC ECM(0x02/0x06)→redbear-ecmd, HID(0x03)→usbhidd,
Mass Storage(0x08)→usbscsid, Hub(0x09)→usbhubd,
Vendor(0xFF)→redbear-ftdi
- Subclass-aware matching (Audio Control vs Streaming, CDC ACM vs ECM)
- is_trusted_usb_driver() whitelist extended with all 7 driver binaries
- Test suite updated with new assertions (11/11 pass)
redbear-usb-hotplugd:
- DRIVER_MAP extended to 11 entries with subclass-aware matching
- Recursive port scanning: scan_ports_recursive() traverses child
hub port directories (handles port1.port2.port3 paths)
- extract_port_id() parses full port paths to extract controller
name and port string for child hub ports
- Protocol-aware extra arg: Storage passes protocol byte (0x50/0x62),
all other classes pass interface number
- Skips CDC Data interfaces (0x0A) and hub interfaces (0x09) when
reading descriptors — matches Linux's interface matching logic
- Improved disconnect detection via descriptor accessibility heuristic
- Cleaner structure: find_driver(), scan_controllers(), scan_ports(),
try_read_descriptors(), main loop with connect/disconnect tracking
All 7 Red Bear USB class drivers now auto-spawning on device connect:
usbhidd, usbscsid, usbhubd, redbear-acmd, redbear-ecmd,
redbear-usbaudiod, redbear-ftdi
Cross-referenced with Linux 7.1 drivers/usb/core/hub.c port event
handling and drivers/usb/core/driver.c device-driver binding.
New daemon (216 lines) that watches USB controllers for device
attachment/detachment and auto-spawns the appropriate class driver.
Architecture:
- Polls /scheme/usb/ every 1000ms for controller directories
- For each controller, enumerates root hub ports
- Reads device descriptors (class/subclass/protocol) via XhciClientHandle
- Maps class to driver binary: HID(0x03)→usbhidd, Storage(0x08)→usbscsid,
Hub(0x09)→usbhubd
- Spawns driver with <scheme> <port> <protocol> arguments
- Tracks spawned Child processes in HashMap<port_path, TrackedDevice>
- Detects disconnection (descriptor read fails) → kills driver + removes
from tracking
- Detects driver exit (try_wait) → removes from tracking
- Skips hub interfaces (usbhubd handles its own children)
Config:
- Added to redbear-mini.toml (inherited by redbear-full)
- Auto-started via 02_usb_hotplug.service (oneshot_async, after base.target
and pcid-spawner)
Driver map supports: HID (0x03), Mass Storage (0x08 with BOT protocol),
Hub (0x09). Additional class drivers extendable via DRIVER_MAP constant.
vasilito