Adds the smart.rs module for disk health monitoring. Since
smartctl is not installed on most systems (this dev host has it
absent), v1.20 implements the module with three-tier graceful
degradation per the zero-stub policy.
New module smart.rs (222 lines, 7 unit tests):
- SmartInfo struct with available + per-disk health records
- SmartHealth struct with passed + attributes + error
- SmartAttribute struct with id + name + value + worst + threshold + raw
- SmartInfo::smartctl_available() — checks smartctl --version
- SmartInfo::read(disks) — orchestrates per-disk smartctl -A -H
- parse_smartctl_output(text) — extracts passed/failed + attrs
- parse_attribute_line(line) — single 10-field SMART attribute
- parse_smart_value(s) — handles both hex (0x33) and decimal
- health_for(disk_name) — convenience accessor
Three-tier graceful degradation:
1. smartctl missing → available=false, disks=[]
2. smartctl errors per disk → error captured in SmartHealth
3. NVMe permission issues → error message, no fabrication
Updated main.rs: mod smart declaration.
76/76 tests pass (5 bench + 12 sensor + 13 network + 12 storage +
20 process + 7 pid_detail + 7 smart).
Linux host smoke test (this dev host without smartctl):
- available=false (graceful, no panic)
- Storage tab still works (no regression)
Cross-compile SHA256 unchanged from v1.19 (smart.rs is dead code
on Redox — compiles but never called).
Docs: improvement plan §44, CONSOLE-TO-KDE §3.3.2 v1.20,
RATATUI-APP-PATTERNS §13.14 + §14 (6360 LoC, 21 modules, 76 tests).
vasilito
f5311f16c8