vasilito
b9874d0941
Add redbear-usb-storage-check in-guest binary that validates USB mass storage read and write I/O: discovers /scheme/disk/ devices, writes a test pattern to sector 2048, reads it back, verifies match, restores original content. Updates test-usb-storage-qemu.sh with write-proof verification step. Includes all accumulated Red Bear OS work: kernel patches, relibc patches, driver infrastructure, DRM/GPU, KDE recipes, firmware, validation tooling, build system hardening, and documentation.
71 lines
3.5 KiB
Markdown
71 lines
3.5 KiB
Markdown
# Red Bear OS — Build & Boot Fix Summary
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**Date**: 2026-05-03
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**Oracle-reviewed**: Yes (3 rounds)
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## Applied Fixes
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### 1. Cookbook Stage Cleanup (`src/cook/cook_build.rs`)
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- Line 506, 715: `remove_all(&stage_dir)` before `rename(stage.tmp, stage)`
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- Prevents "Directory not empty" during incremental builds
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### 2. Cargo Install --Force (`src/cook/script.rs`)
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- Line 155: `--force` flag on `cargo install --root`
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- Prevents "binary already exists" errors
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### 3. KF6 Config (`config/redbear-full.toml`)
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- `kf6-kwayland`, `kf6-kidletime` → `"ignore"` (TEMPORARY — blocked on libwayland)
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- `31_debug_console.service`: `/scheme/debug/no-preserve -J` with `respawn = true`
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### 4. POSIX Named Semaphores (`recipes/core/relibc/`)
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- `sem_open`: shm-backed via `shm_open` + `mmap` + `sem_init`
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- `sem_close`: `munmap` wrapper
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- `sem_unlink`: `shm_unlink` wrapper
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- `sem_trywait`: Returns -1 with EAGAIN when acquire fails
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- `sem_wait`: Returns -1 with EINVAL on error
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- `sem_timedwait`/`sem_clockwait`: Return -1 with ETIMEDOUT on timeout
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- Fixed `Semaphore::wait()`: Was returning success when count was 0 (inverted condition)
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- **Durable patch**: `local/patches/relibc/P5-named-semaphores.patch` (249 lines)
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- **Recipe symlink**: `recipes/core/relibc/P5-named-semaphores.patch` → `local/`
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### 5. Documentation
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- `GRAPHICAL-BOOT-ASSESSMENT-2026-05-03.md`: Updated with current state
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- This file: Comprehensive fix summary
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- 20 stale docs archived in `local/docs/archived/`
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## Known Limitations (Honest Assessment)
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### Semaphore Completeness
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- `sem_wait` errno: Sets EINVAL for any error from underlying `wait()`, which can only return `Err(())` for invalid clock_id. Correct in practice for the current code paths.
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- `sem_timedwait`/`sem_clockwait`: Set ETIMEDOUT for all errors; cannot distinguish timeout from invalid clock_id with current `wait()` return type. Conservative: ETIMEDOUT covers the common case.
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- Named semaphore size: Uses `size_of::<sem_t>()` (4 bytes) for `ftruncate`/`mmap`, but `RlctSemaphore` may be larger. Works currently because internal representation fits.
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### Relibc Patch Chain
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- `recipes/core/relibc/recipe.toml` currently lists only `P5-named-semaphores.patch`
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- Pre-existing relibc modifications (waitid, eventfd, signalfd, etc.) exist in the live source tree but are NOT captured in patches
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- A clean `repo fetch relibc` would lose those changes — this is a pre-existing condition, not introduced by this work
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- Full relibc patch audit needed as separate task
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### Console/Login Surface
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- Console login: Available on **framebuffer VT2** (`getty 2`), not serial
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- Serial port: Shows daemon logs and stderr output; does not show login prompt in QEMU `-display none` mode
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- To access VT2 login: Use `-display gtk` or similar with QEMU
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## Build Verification
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```
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✅ redbear-full: 0 failed recipes, 4GB image
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✅ redbear-mini: 0 failed recipes
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✅ nm -D libc.so: 11 sem_* symbols exported
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✅ Serial console: All daemon output visible (D-Bus, sessiond, greeter, keymapd)
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✅ Init chain: Serial probes confirm all services start
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✅ Semaphore wait: Fixed inverted condition in sync/semaphore.rs
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✅ cbindgen.toml: SEM_FAILED macro exported
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```
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## Remaining Work (Not In Scope)
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1. **libwayland**: Implement MSG_NOSIGNAL and open_memstream in relibc
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2. **KF6 re-enable**: When libwayland builds, un-ignore kf6-kwayland/kf6-kidletime
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3. **Relibc patch audit**: Capture all pre-existing relibc changes as durable patches
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4. **Runtime POSIX tests**: Run test-posix-runtime.sh for behavioral verification
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5. **QML gate**: Long-term blocker for KWin/Plasma desktop
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