docs: second-pass boot audit (D-Bus honesty, shell quality, login), archive 4 stale docs
BOOT-PROCESS-SECOND-AUDIT-2026-05-03.md: deep dive into: - D-Bus implementation honesty (15/19 login1 methods real, not stubs) - ion shell quality matrix (vs bash/dash) - Login prompt completeness (getty→login→ion chain) - Per-subsystem hardware init status (storage/display/input/network/USB/audio/ACPI) - Implementation plan Phases F1-F6 Archived 4 completed/deferred plans: GRUB, VFAT, USB-BOOT-INPUT, ZSH-PORTING
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# GRUB Integration Plan — Red Bear OS
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**Date:** 2026-04-17
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**Status:** Fully implemented (build-tested, not yet runtime boot-tested). ESP formatted as FAT32
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per UEFI spec. Both Phase 1 (post-build script) and Phase 2 (installer-native) are wired.
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**Remaining:** Runtime UEFI boot validation in QEMU (`make all CONFIG_NAME=redbear-grub && make qemu`).
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**Prerequisite:** The `grub` package is included in `redbear-grub.toml` for clean-tree builds.
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**Approach:** Option A — GRUB as boot manager, chainloading Redox bootloader
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## Overview
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Add GNU GRUB as an optional boot manager for Red Bear OS. GRUB presents a menu
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at boot and chainloads the existing Redox bootloader, which then boots the
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kernel normally. This gives users:
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- Multi-boot capability alongside Linux, Windows, or other OSes
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- Boot menu with timeout and manual selection
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- Familiar GRUB rescue shell for debugging
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- No changes to the Redox kernel, RedoxFS, or existing boot flow
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## Architecture
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```
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UEFI firmware
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→ EFI/BOOT/BOOTX64.EFI (GRUB standalone image)
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→ grub.cfg: default entry chainloads Redox bootloader
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→ EFI/REDBEAR/redbear.efi (Redox bootloader)
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→ Reads RedoxFS partition
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→ Loads kernel
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→ Boots Red Bear OS
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```
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### ESP Layout (GRUB mode)
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```
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EFI/
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├── BOOT/
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│ ├── BOOTX64.EFI ← GRUB (primary, loaded by UEFI firmware)
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│ └── grub.cfg ← GRUB configuration
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└── REDBEAR/
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└── redbear.efi ← Redox bootloader (chainload target)
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```
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### ESP Layout (default, no GRUB)
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```
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EFI/
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└── BOOT/
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└── BOOTX64.EFI ← Redox bootloader (unchanged)
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```
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## Why GRUB?
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1. **GRUB does not support RedoxFS.** Writing a GRUB filesystem module for
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RedoxFS is high-risk, GPL-licensing-sensitive work. Chainloading avoids it.
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2. **The Redox bootloader works.** It reads RedoxFS directly and boots the
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kernel. No need to replicate that logic in GRUB.
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3. **GRUB is universally understood.** System administrators know GRUB. A
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`grub.cfg` is easier to customize than a custom bootloader.
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4. **Multi-boot.** GRUB can boot Linux, Windows, and other OSes alongside
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Red Bear OS without any changes to those systems.
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## GRUB Module Set
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The standalone EFI image includes these modules:
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| Module | Purpose |
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|--------|---------|
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| `part_gpt` | GPT partition table support |
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| `part_msdos` | MBR partition table support |
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| `fat` | FAT32 filesystem (ESP) |
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| `ext2` | ext2/3/4 filesystem |
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| `normal` | Normal mode (menu, scripting) |
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| `configfile` | Load configuration files |
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| `search` | Search for files/volumes |
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| `search_fs_uuid` | Search by filesystem UUID |
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| `search_label` | Search by volume label |
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| `echo` | Print messages |
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| `test` | Conditional expressions |
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| `ls` | List files and devices |
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| `cat` | Display file contents |
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| `halt` | Shut down |
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| `reboot` | Reboot |
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Note: `chainloader` is a built-in command in GRUB 2.12 (no separate module needed).
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Red Bear policy now requires a local `redoxfs.mod` artifact for GRUB builds.
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The GRUB recipe resolves it in this order:
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1. `local/recipes/core/grub/modules/redoxfs.mod`
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2. `${COOKBOOK_SYSROOT}/usr/lib/grub/x86_64-efi/redoxfs.mod`
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If neither exists, the GRUB recipe fails fast.
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## GRUB Configuration
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The default `grub.cfg`:
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```cfg
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# Red Bear OS GRUB Configuration
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set default=0
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set timeout=5
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menuentry "Red Bear OS" {
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chainloader /EFI/REDBEAR/redbear.efi
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boot
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}
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menuentry "Reboot" {
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reboot
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}
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menuentry "Shutdown" {
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halt
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}
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```
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Users can customize `grub.cfg` to add entries for other operating systems,
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change the timeout, or add additional Red Bear OS entries (e.g., recovery
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mode with different kernel parameters, once supported).
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## ESP Size Requirements
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| Component | Typical Size |
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|-----------|--------------|
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| GRUB EFI binary (with modules) | ~500 KiB (varies with module list) |
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| Redox bootloader | 100–200 KiB |
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| grub.cfg | < 1 KiB |
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| **Total** | **~1 MiB** |
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The default ESP is 1 MiB (too small for GRUB). Configs using GRUB must set:
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```toml
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[general]
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efi_partition_size = 16 # 16 MiB, enough for GRUB + Redox bootloader + margin
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```
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## Linux-Compatible CLI
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Red Bear OS provides `grub-install` and `grub-mkconfig` wrappers that match GNU GRUB
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command-line conventions. Users migrating from Linux can use familiar switches.
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| Linux Command | Red Bear OS Location |
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|---------------|---------------------|
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| `grub-install` | `local/scripts/grub-install` |
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| `grub-mkconfig` | `local/scripts/grub-mkconfig` |
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Add to PATH for convenience:
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```bash
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export PATH="$PWD/local/scripts:$PATH"
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```
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### grub-install
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```bash
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# Install GRUB into a disk image
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grub-install --target=x86_64-efi --disk-image=build/x86_64/harddrive.img
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# Verbose mode
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grub-install --target=x86_64-efi --disk-image=build/x86_64/harddrive.img --verbose
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# Show help
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grub-install --help
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```
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Supported options: `--target=`, `--efi-directory=`, `--bootloader-id=`, `--removable`,
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`--disk-image=`, `--modules=`, `--no-nvram`, `--verbose`, `--help`, `--version`.
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Unsupported Linux options are accepted and ignored silently for script compatibility.
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### grub-mkconfig
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```bash
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# Preview generated config
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grub-mkconfig
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# Write to file
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grub-mkconfig -o local/recipes/core/grub/grub.cfg
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# Custom timeout
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grub-mkconfig --timeout=10 -o /boot/grub/grub.cfg
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```
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Supported options: `-o`/`--output=`, `--timeout=`, `--set-default=`, `--help`, `--version`.
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## Implementation — Phase 1: Post-Build Script
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Phase 1 uses a post-build script to modify the ESP in an existing disk image.
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This approach requires **no changes to the installer** and works immediately.
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### Files
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| File | Purpose |
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|------|---------|
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| `local/recipes/core/grub/recipe.toml` | Build GRUB from source, produce `grub.efi` |
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| `local/recipes/core/grub/grub.cfg` | Default GRUB configuration |
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| `local/recipes/core/grub/modules/redoxfs.mod` | Mandatory local GRUB RedoxFS module artifact |
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| `local/scripts/install-grub.sh` | Post-build ESP modification script |
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| `local/scripts/fat_tool.py` | Python FAT32 tool (no mtools dependency) |
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| `recipes/core/grub → local/recipes/core/grub` | Symlink for recipe discovery |
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### Workflow
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```bash
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# 1. Build GRUB recipe
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make r.grub
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# 2. Build Red Bear OS (with larger ESP)
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make all CONFIG_NAME=redbear-full # Must have efi_partition_size = 16
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# 3. Install GRUB into disk image
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./local/scripts/install-grub.sh build/x86_64/harddrive.img
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# 4. Test
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make qemu
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```
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### Requirements
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- Python 3 (for `fat_tool.py` — no mtools dependency)
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- GRUB build dependencies: `gcc`, `make`, `bison`, `flex`, `autoconf`, `automake`
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- ESP must be ≥ 8 MiB (set `efi_partition_size = 16` in config)
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## Implementation — Phase 2: Installer-Native Support
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Phase 2 adds GRUB awareness directly to the Redox installer, eliminating the
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post-build script step. The installer reads `bootloader = "grub"` from config,
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fetches the GRUB package alongside the bootloader, and writes the chainload
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ESP layout automatically.
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### Changes Made
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1. **`GeneralConfig`** (`config/general.rs`): Added `bootloader: Option<String>`
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field (`"redox"` default, `"grub"` for GRUB), with merge support.
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2. **`DiskOption`** (`installer.rs`): Added `grub_efi: Option<&[u8]>` and
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`grub_config: Option<&[u8]>` fields for optional GRUB data.
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3. **`fetch_bootloaders`**: When `bootloader = "grub"`, installs the `grub`
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package alongside `bootloader` and returns `grub.efi` + `grub.cfg` data.
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Return type extended to `(bios, efi, grub_efi, grub_cfg)`.
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4. **`with_whole_disk` / `with_whole_disk_ext4`**: When `grub_efi` and
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`grub_config` are both present, writes the GRUB chainload layout:
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- `EFI/BOOT/BOOTX64.EFI` ← GRUB
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- `EFI/BOOT/grub.cfg` ← GRUB configuration
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- `EFI/REDBEAR/redbear.efi` ← Redox bootloader (chainload target)
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5. **`install_inner`**: Passes GRUB data from `fetch_bootloaders` through
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`DiskOption`.
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6. **CLI** (`bin/installer.rs`): Added `--bootloader grub` flag that sets
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`config.general.bootloader`.
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7. **TUI** (`bin/installer_tui.rs`): Updated `DiskOption` construction with
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`grub_efi: None, grub_config: None`.
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### Config Usage
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```toml
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# config/redbear-grub.toml
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include = ["redbear-full.toml"]
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[general]
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bootloader = "grub"
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efi_partition_size = 16
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```
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Or via CLI (note: INSTALLER_OPTS replaces defaults, so --cookbook=. must be included):
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```bash
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./target/release/repo cook installer
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make all CONFIG_NAME=redbear-full INSTALLER_OPTS="--cookbook=. --bootloader grub"
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```
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**Note:** The config file approach (`redbear-grub.toml`) is preferred over the CLI flag
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because INSTALLER_OPTS completely replaces the default value (`--cookbook=.`) rather than
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appending to it. Omitting `--cookbook=.` breaks local package resolution for GRUB.
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## GRUB Recipe Design
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The GRUB recipe uses `template = "custom"` because GRUB must be built for the
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**host machine** (it's a build tool that produces EFI binaries), not for the
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Redox target. The cookbook's `configure` template cross-compiles for Redox,
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which is wrong for GRUB.
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Key build steps:
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1. Configure with `--target=x86_64 --with-platform=efi` (produces x86_64 EFI)
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2. Disable unnecessary components (themes, mkfont, mount, device-mapper)
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3. Run `grub-mkimage` to create standalone EFI binary with curated modules
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4. Stage `grub.efi` and `grub.cfg` to `/usr/lib/boot/`
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### Build Notes
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The recipe uses `template = "custom"` because the cookbook's default `configure`
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template sets `--host="${GNU_TARGET}"` for Redox cross-compilation, which is wrong
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for GRUB (a host build tool producing EFI binaries).
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Two issues required workarounds:
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1. **Cross-compiler override.** The cookbook sets `CC`, `CXX`, `CFLAGS`, etc. to
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the Redox cross-toolchain. GRUB must be built with the host compiler. Fix:
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`unset CC CXX CPP LD AR NM RANLIB OBJCOPY STRIP PKG_CONFIG` and
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`unset CFLAGS CXXFLAGS CPPFLAGS LDFLAGS` at the top of the script.
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2. **Missing `extra_deps.lst`.** GRUB 2.12 release tarballs omit
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`grub-core/extra_deps.lst` (normally generated by `autogen.sh` from git).
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Fix: `touch "${COOKBOOK_SOURCE}/grub-core/extra_deps.lst"` before configure.
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3. **grub.cfg location.** The config file lives in the recipe directory
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(`${COOKBOOK_RECIPE}/grub.cfg`), not in the extracted source tarball
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(`${COOKBOOK_SOURCE}/`). The copy step uses `COOKBOOK_RECIPE`.
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## Security Considerations
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- GRUB configuration is on the ESP (FAT32), which is readable/writable by any OS
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- Secure Boot: GRUB standalone images are not signed. Users needing Secure Boot
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must sign `BOOTX64.EFI` with their own key or use `shim`
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- The chainload target (`EFI/REDBEAR/redbear.efi`) is also on the ESP
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- No credentials or secrets are stored in the GRUB configuration
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## Limitations
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- GRUB cannot read RedoxFS (no module exists)
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- Cannot pass kernel parameters directly (chainloading bypasses this)
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- BIOS boot is not supported (only UEFI)
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- ESP must be sized to ≥ 8 MiB in config (16 MiB recommended)
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- GRUB bootloader is incompatible with `skip_partitions = true` (requires GPT layout with ESP)
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- TUI installer does not support GRUB mode (intentional — TUI is for live disk reinstall)
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- Runtime UEFI boot test has not been performed yet (requires full `make all` build, ~hours)
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## Testing
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### Phase 1: Post-build script (standalone)
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```bash
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# Build GRUB recipe
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make r.grub
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# Build image (any config with efi_partition_size >= 16)
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make all CONFIG_NAME=redbear-full
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# Install GRUB into disk image (uses fat_tool.py, no mtools needed)
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./local/scripts/install-grub.sh build/x86_64/harddrive.img
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# Verify ESP contents
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python3 local/scripts/fat_tool.py ls build/x86_64/harddrive.img 1048576 /
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# Boot in QEMU
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make qemu
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# Expected: GRUB menu appears, "Red Bear OS" entry boots successfully
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```
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### Phase 2: Installer-native (automatic)
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```bash
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# Build GRUB recipe (must be built before installer runs)
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make r.grub
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# Build image with GRUB config (installer fetches GRUB automatically)
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make all CONFIG_NAME=redbear-grub
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# Or via CLI flag
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make all CONFIG_NAME=redbear-full INSTALLER_OPTS="--bootloader grub --cookbook=."
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# Verify ESP contents
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python3 local/scripts/fat_tool.py ls build/x86_64/harddrive.img 1048576 /
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# Boot in QEMU
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make qemu
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# Expected: GRUB menu appears, "Red Bear OS" entry boots successfully
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```
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### Unit tests (no full build required)
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```bash
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# Verify GRUB recipe builds
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CI=1 ./target/release/repo cook grub
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# Verify host-side installer accepts --bootloader flag
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build/fstools/bin/redox_installer --bootloader=grub --config=config/redbear-grub.toml --list-packages
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# Verify fat_tool.py operations
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python3 local/scripts/fat_tool.py --help
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```
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## References
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- GNU GRUB Manual: https://www.gnu.org/software/grub/manual/grub/grub.html
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- GRUB EFI standalone image: `grub-mkimage -O x86_64-efi ...`
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- UEFI boot specification: `EFI/BOOT/BOOTX64.EFI` is the fallback boot path
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- Redox bootloader source: `recipes/core/bootloader/source/`
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- Installer GPT layout: `recipes/core/installer/source/src/installer.rs`
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@@ -13,5 +13,9 @@ current plans. They are kept for reference only.
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| `GREETER-LOGIN-ANALYSIS.md` | `GREETER-LOGIN-IMPLEMENTATION-PLAN.md` |
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| `INTEL-HDA-IMPLEMENTATION-PLAN.md` | (Deferred — audio is P3 priority) |
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| `ACPI-I2C-HID-IMPLEMENTATION-PLAN.md` | (Deferred — USB HID is primary input path) |
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| `GRUB-INTEGRATION-PLAN.md` | GRUB is fully implemented (redbear-grub config, installer support, grub recipe) |
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| `VFAT-IMPLEMENTATION-PLAN.md` | VFAT is fully implemented (fatd, fat-mkfs, fat-label, fat-check) |
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| `USB-BOOT-INPUT-PLAN.md` | Superseded — USB HID in initfs, USB storage in initfs (Phase B2) |
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| `ZSH-PORTING-PLAN.md` | Deferred indefinitely — ion is the default shell |
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## Date archived: 2026-05-03
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@@ -0,0 +1,169 @@
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# USB Boot Input Plan
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## Goal
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Make external USB keyboards a reliable bare-metal boot fallback for Red Bear OS.
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This is a boot-resilience requirement, not optional polish. A system that reaches early
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boot but cannot accept keyboard input on modern hardware is not a complete live/recovery
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environment.
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## Current Assessment
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### What works today
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- `xhcid` is the only host-controller path with a real runtime device model.
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- `xhcid` spawns `usbhubd` and `usbhidd` via class matching.
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- `usbhidd` reads HID input reports and forwards keyboard/mouse events into `inputd`.
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This means USB keyboard input can work today only when the keyboard is reached through the
|
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`xHCI -> usbhubd/usbhidd -> inputd` path.
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### What does not work today
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- `ehcid` is still an ownership / handoff / port-state daemon, not a real runtime host stack.
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- `uhcid` is still ownership + port reset + logging only; full scheduling/enumeration is explicitly
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not implemented.
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||||
- `ohcid` is in the same state as `uhcid`.
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||||
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||||
The code is explicit about this:
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||||
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||||
- `ehcid`: connected EHCI-owned ports still fail with "EHCI enumeration is still not implemented"
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||||
- `uhcid`: connected ports still fail with "runtime enumeration is still not implemented"
|
||||
- `ohcid`: connected ports still fail with "OHCI enumeration is still not implemented"
|
||||
|
||||
### Important practical consequence
|
||||
|
||||
An external USB keyboard on bare metal is **not guaranteed** to appear through `xHCI`.
|
||||
|
||||
It may instead land on:
|
||||
|
||||
- an EHCI root-hub path
|
||||
- a UHCI/OHCI companion path after EHCI handoff
|
||||
- a firmware/routing topology where low/full-speed devices do not end up on the `xHCI` runtime path
|
||||
|
||||
On such systems, the current code can detect controller ownership and connected ports, but still
|
||||
cannot produce a real keyboard input path.
|
||||
|
||||
### LED state is a separate and weaker path
|
||||
|
||||
`usbhidd` now has a bounded best-effort HID output-report path for keyboard LEDs. It toggles
|
||||
`Caps Lock`, `Num Lock`, and `Scroll Lock` locally on keydown and sends a one-byte HID output
|
||||
report via `SET_REPORT`.
|
||||
|
||||
This is useful, but it is **not** the same as a complete global keyboard lock-state authority:
|
||||
|
||||
- it is per-device, not system-global
|
||||
- it is best-effort and disables itself after the first device-side failure
|
||||
- it does not solve missing USB enumeration on non-xHCI host-controller paths
|
||||
|
||||
So dead `Caps Lock` / `Num Lock` indicators still do **not** prove that keyboard transport is dead,
|
||||
and working LEDs do **not** prove that the external USB keyboard fallback problem is solved.
|
||||
|
||||
## Root-Cause Summary For Current Bare-Metal Symptom
|
||||
|
||||
When a USB-attached keyboard does not bring up input during boot, the most likely causes are:
|
||||
|
||||
1. the keyboard is not on the `xHCI` runtime path
|
||||
2. it lands on `EHCI/UHCI/OHCI`, where enumeration is not implemented yet
|
||||
3. even if input later works, keyboard LEDs may still be misleading because LED sync is only a
|
||||
bounded per-device best-effort path
|
||||
|
||||
## Current Structural Gap
|
||||
|
||||
There is also a policy gap:
|
||||
|
||||
- `ehcid`, `uhcid`, and `ohcid` contain `--strict-boot` logic
|
||||
- and the current boot path still does **not** hardcode `--strict-boot` in initfs driver command lines
|
||||
- however, strict mode can now be enabled through `REDBEAR_STRICT_USB_BOOT=1`, which is inherited by
|
||||
`pcid-spawner` service units and then by legacy USB controller daemons
|
||||
|
||||
So the code contains a boot-guard concept that is currently not activated by the initfs spawn path.
|
||||
|
||||
This does not create input support by itself, but it does matter for observability and boot policy.
|
||||
|
||||
## Execution Order
|
||||
|
||||
### Phase U-B1: Make boot policy honest
|
||||
|
||||
Deliverables:
|
||||
|
||||
- decide whether initfs should pass `--strict-boot` to legacy USB host daemons
|
||||
- provide a non-invasive runtime toggle for strict mode during bring-up
|
||||
- if enabled, make the failure mode explicit and bounded
|
||||
- if not enabled, log clearly that legacy USB ownership exists without runtime enumeration
|
||||
|
||||
Acceptance:
|
||||
|
||||
- the boot log makes it obvious whether the system has a usable USB keyboard path or only controller
|
||||
ownership
|
||||
- strict mode can be enabled without rewriting driver command lines
|
||||
|
||||
### Phase U-B2: Finish legacy host runtime enumeration
|
||||
|
||||
Deliverables:
|
||||
|
||||
- implement real device enumeration for `uhcid`
|
||||
- implement real device enumeration for `ohcid`
|
||||
- implement real runtime ownership of low/full-speed devices behind `ehcid` companion routing
|
||||
|
||||
Acceptance:
|
||||
|
||||
- a low/full-speed USB keyboard on bare metal can reach `usbhidd` through the legacy host path
|
||||
|
||||
### Phase U-B3: Keep one HID class path
|
||||
|
||||
Deliverables:
|
||||
|
||||
- avoid inventing a second HID stack just for legacy controllers
|
||||
- make legacy host controllers feed the existing USB class-driver model
|
||||
- keep `usbhidd` and `usbhubd` as the class daemons above controller-specific ownership
|
||||
|
||||
Acceptance:
|
||||
|
||||
- keyboard class handling is shared regardless of host controller family
|
||||
|
||||
### Phase U-B4: Implement keyboard LED output
|
||||
|
||||
Deliverables:
|
||||
|
||||
- keep the new HID output-report support in `usbhidd` bounded and non-fatal
|
||||
- decide whether the current per-device local toggle model is sufficient, or whether Red Bear
|
||||
later needs a system-authoritative lock-state surface
|
||||
- preserve the rule that LED sync must never block or destabilize keyboard input
|
||||
|
||||
Acceptance:
|
||||
|
||||
- LED state tracks keyboard lock state on at least one supported USB keyboard in the current
|
||||
bounded per-device model
|
||||
|
||||
### Phase U-B5: Validation
|
||||
|
||||
Deliverables:
|
||||
|
||||
- QEMU validation for xHCI remains
|
||||
- add bounded validation for legacy host-controller paths where feasible
|
||||
- require bare-metal validation on systems where external USB keyboard currently fails
|
||||
|
||||
Acceptance:
|
||||
|
||||
- one xHCI bare-metal proof
|
||||
- one EHCI/UHCI/OHCI-involved bare-metal proof
|
||||
- explicit evidence that external USB keyboard input reaches login
|
||||
|
||||
## Design Rules
|
||||
|
||||
- do not treat controller ownership as equivalent to device enumeration
|
||||
- do not treat keyboard LED state as equivalent to keyboard input health
|
||||
- reuse the existing HID class-driver path instead of splitting per-controller userland stacks
|
||||
- prefer bounded boot-policy checks and explicit failure logs over silent partial bring-up
|
||||
|
||||
## Priority Judgment
|
||||
|
||||
For bare-metal boot resilience, the correct order is:
|
||||
|
||||
1. finish legacy USB host runtime enumeration
|
||||
2. then add keyboard LED output reports
|
||||
3. in parallel, continue `I2C-HID` for internal modern laptop keyboards/touchpads
|
||||
|
||||
External USB keyboard fallback and internal `I2C-HID` are complementary. Red Bear needs both.
|
||||
@@ -0,0 +1,916 @@
|
||||
# VFAT Implementation Plan — Red Bear OS
|
||||
|
||||
**Date:** 2026-04-17
|
||||
**Status:** Implemented (Phase 1–3 complete, Phase 2b complete, Phase 4 deferred to runtime validation)
|
||||
**Scope:** FAT12/16/32 with LFN (VFAT) — data volumes and ESP only (NOT root filesystem)
|
||||
**Reference Implementation:** `local/recipes/core/ext4d/` (ext4 scheme daemon)
|
||||
|
||||
## 1. Executive Summary
|
||||
|
||||
Implement full VFAT support in Red Bear OS: a FAT scheme daemon (`fatd`) for mounting
|
||||
FAT filesystems at runtime, management tools (mkfs, label, check), installer ESP
|
||||
integration, and runtime auto-mount for USB storage and SD cards.
|
||||
|
||||
FAT is **not** a root filesystem target — RedoxFS and ext4 remain the root options.
|
||||
FAT serves for: EFI System Partitions, USB mass storage, SD cards, and data exchange
|
||||
with other operating systems.
|
||||
|
||||
**Recommended crate:** `fatfs` v0.3.6 (MIT, 356 stars, already in dependency tree via
|
||||
installer). It provides FAT12/16/32, LFN, formatting, read/write, and `no_std` support.
|
||||
|
||||
**Estimated effort:** 6–10 weeks for a complete, tested implementation.
|
||||
|
||||
## 2. Current State
|
||||
|
||||
### What Exists
|
||||
|
||||
| Component | Location | Status |
|
||||
|-----------|----------|--------|
|
||||
| RedoxFS (default root FS) | `recipes/core/redoxfs/` | ✅ Stable |
|
||||
| ext4 (alternate root FS) | `local/recipes/core/ext4d/` | ✅ Scheme daemon + mkfs + installer wired |
|
||||
| `fatfs` crate in installer | `local/patches/installer/redox.patch` | ✅ Host-side EFI partition formatting only |
|
||||
| `redox-fatfs` library | `recipes/libs/redox-fatfs/` | ❌ Commented out, dead code |
|
||||
| Bootloader FAT reading | `recipes/core/bootloader/` | ❌ Reads RedoxFS only, no FAT |
|
||||
| GRUB FAT reading | GRUB EFI image | ✅ GRUB `fat` module reads ESP |
|
||||
| exfat-fuse | `recipes/wip/fuse/exfat-fuse/` | ❌ WIP, not compiled |
|
||||
|
||||
### What Is Missing (the gaps this plan fills)
|
||||
|
||||
| Gap | Priority | Description |
|
||||
|-----|----------|-------------|
|
||||
| VFAT scheme daemon | Critical | No `fatd` scheme for mounting FAT at runtime |
|
||||
| FAT block device adapter | Critical | No adapter bridging Redox block I/O → `fatfs` traits |
|
||||
| FAT management tools | High | No mkfs.fat, fatlabel, fsck.fat equivalents |
|
||||
| Runtime auto-mount | High | No service to detect and mount FAT block devices |
|
||||
| FAT filesystem checker | Medium | No verification or repair tool |
|
||||
|
||||
### Key Architectural Decision
|
||||
|
||||
The `ext4d` workspace at `local/recipes/core/ext4d/source/` is the exact template for
|
||||
this implementation. It demonstrates:
|
||||
|
||||
1. **Block device adapter** — `ext4-blockdev/` with FileDisk (Linux) + RedoxDisk (Redox)
|
||||
2. **Scheme daemon** — `ext4d/` with full FSScheme via `redox_scheme::SchemeSync`
|
||||
3. **Management tool** — `ext4-mkfs/` as a standalone binary
|
||||
4. **Workspace structure** — Workspace Cargo.toml, resolver=3, edition=2024
|
||||
5. **Feature flags** — `default = ["redox"]`, redox = ["dep:libredox", ...]
|
||||
6. **Recipe** — `template = "custom"` with `COOKBOOK_CARGO_PATH`
|
||||
|
||||
## 3. Implementation Phases
|
||||
|
||||
### Phase 1: FAT Scheme Daemon (`fatd`) — 3–4 weeks
|
||||
|
||||
**Goal:** A working VFAT scheme daemon that can mount and serve FAT filesystems.
|
||||
|
||||
#### 1.1 Workspace Setup
|
||||
|
||||
Create `local/recipes/core/fatd/` workspace mirroring ext4d structure:
|
||||
|
||||
```
|
||||
local/recipes/core/fatd/
|
||||
├── recipe.toml ← Custom build script
|
||||
└── source/
|
||||
├── Cargo.toml ← Workspace: fat-blockdev, fatd, fat-mkfs, fat-label, fat-check
|
||||
├── fat-blockdev/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ ├── lib.rs ← Re-exports + FatError type
|
||||
│ ├── file_disk.rs ← FileDisk: std::fs backed (Linux host)
|
||||
│ └── redox_disk.rs ← RedoxDisk: libredox backed (Redox target)
|
||||
├── fatd/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ ├── main.rs ← Daemon entry: fork, SIGTERM, dispatch
|
||||
│ ├── mount.rs ← Scheme event loop (SchemeSync)
|
||||
│ ├── scheme.rs ← FatScheme: full FSScheme impl
|
||||
│ └── handle.rs ← FileHandle, DirHandle, Handle types
|
||||
├── fat-mkfs/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ └── main.rs ← Create FAT filesystems
|
||||
├── fat-label/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ └── main.rs ← Read/write volume labels
|
||||
└── fat-check/
|
||||
├── Cargo.toml
|
||||
└── src/
|
||||
└── main.rs ← Verify + repair FAT filesystems
|
||||
```
|
||||
|
||||
**Recipe** (`recipe.toml`):
|
||||
```toml
|
||||
[source]
|
||||
path = "source"
|
||||
|
||||
[build]
|
||||
template = "custom"
|
||||
script = """
|
||||
COOKBOOK_CARGO_PATH=fatd cookbook_cargo
|
||||
COOKBOOK_CARGO_PATH=fat-mkfs cookbook_cargo
|
||||
COOKBOOK_CARGO_PATH=fat-label cookbook_cargo
|
||||
COOKBOOK_CARGO_PATH=fat-check cookbook_cargo
|
||||
"""
|
||||
```
|
||||
|
||||
**Workspace `Cargo.toml`**:
|
||||
```toml
|
||||
[workspace]
|
||||
members = ["fat-blockdev", "fatd", "fat-mkfs", "fat-label", "fat-check"]
|
||||
resolver = "3"
|
||||
|
||||
[workspace.package]
|
||||
version = "0.1.0"
|
||||
edition = "2024"
|
||||
license = "MIT"
|
||||
|
||||
[workspace.dependencies]
|
||||
fatfs = "0.3.6"
|
||||
fscommon = "0.1.1"
|
||||
redox_syscall = "0.7.3"
|
||||
redox-scheme = "0.11.0"
|
||||
libredox = "0.1.13"
|
||||
redox-path = "0.3.0"
|
||||
log = "0.4"
|
||||
env_logger = "0.11"
|
||||
libc = "0.2"
|
||||
```
|
||||
|
||||
**Symlink**: `recipes/core/fatd → ../../local/recipes/core/fatd`
|
||||
|
||||
#### 1.2 Block Device Adapter (`fat-blockdev`)
|
||||
|
||||
The `fatfs` crate uses `Read + Seek` and `Read + Write + Seek` traits for block device
|
||||
access. We need adapters that wrap Redox's block I/O into these traits.
|
||||
|
||||
**`file_disk.rs`** (Linux host):
|
||||
```rust
|
||||
// Wraps std::fs::File to implement Read+Write+Seek
|
||||
// Identical pattern to ext4-blockdev/src/file_disk.rs
|
||||
// Uses fscommon::BufStream for caching
|
||||
pub struct FileDisk { ... }
|
||||
impl Read for FileDisk { ... }
|
||||
impl Write for FileDisk { ... }
|
||||
impl Seek for FileDisk { ... }
|
||||
```
|
||||
|
||||
**`redox_disk.rs`** (Redox target, feature-gated):
|
||||
```rust
|
||||
// Wraps libredox fd to implement Read+Write+Seek
|
||||
// Uses syscall::call::open/read/write/lseek/fstat
|
||||
// Pattern from ext4-blockdev/src/redox_disk.rs
|
||||
pub struct RedoxDisk {
|
||||
fd: usize,
|
||||
size: u64, // from fstat
|
||||
}
|
||||
impl Read for RedoxDisk { ... }
|
||||
impl Write for RedoxDisk { ... }
|
||||
impl Seek for RedoxDisk { ... }
|
||||
```
|
||||
|
||||
**Critical detail**: Wrap the disk in `fscommon::BufStream` for performance —
|
||||
`fatfs` does no internal caching and performs poorly without buffering.
|
||||
|
||||
```rust
|
||||
let disk = RedoxDisk::open(disk_path)?;
|
||||
let buf_disk = fscommon::BufStream::new(disk);
|
||||
let fs = fatfs::FileSystem::new(buf_disk, fatfs::FsOptions::new())?;
|
||||
```
|
||||
|
||||
#### 1.3 VFAT Scheme Daemon (`fatd`)
|
||||
|
||||
**Architecture**: Single `fatfs::FileSystem` instance per daemon process. The `fatfs`
|
||||
crate is NOT safe for concurrent access from multiple `FileSystem` objects on the same
|
||||
device. One daemon = one mounted filesystem = one `FileSystem` instance.
|
||||
|
||||
**`handle.rs`** — Handle types:
|
||||
|
||||
```rust
|
||||
pub enum Handle {
|
||||
File(FileHandle),
|
||||
Directory(DirectoryHandle),
|
||||
SchemeRoot,
|
||||
}
|
||||
|
||||
pub struct FileHandle {
|
||||
path: String,
|
||||
offset: u64,
|
||||
flags: usize,
|
||||
}
|
||||
|
||||
pub struct DirectoryHandle {
|
||||
path: String,
|
||||
entries: Vec<DirEntryInfo>, // cached readdir results
|
||||
offset: usize,
|
||||
flags: usize,
|
||||
}
|
||||
```
|
||||
|
||||
**Key difference from ext4d**: `fatfs` does not have persistent file handles like
|
||||
rsext4's `OpenFile`. Files must be re-opened on each read/write operation. The
|
||||
`FileHandle` stores the path and offset, and the scheme re-opens the file on each
|
||||
`read`/`write` call.
|
||||
|
||||
**`scheme.rs`** — FatScheme implementing `SchemeSync`:
|
||||
|
||||
Required methods and their `fatfs` mapping:
|
||||
|
||||
| SchemeSync method | fatfs operation |
|
||||
|-------------------|-----------------|
|
||||
| `scheme_root()` | Return SchemeRoot handle |
|
||||
| `openat()` | `fs.root_dir().open_dir(path)` or `open_file(path)` |
|
||||
| `read()` | Re-open file, seek to offset, `file.read(buf)` |
|
||||
| `write()` | Re-open file, seek to offset, `file.write(buf)` |
|
||||
| `fsize()` | Re-open file, `file.len()` |
|
||||
| `fstat()` | `dir.iter().find()` for entry, construct `Stat` |
|
||||
| `fstatvfs()` | `fs.stats()` for block/free counts |
|
||||
| `getdents()` | `dir.iter()` collect entries, serve from handle cache |
|
||||
| `ftruncate()` | Re-open file, `file.truncate()` |
|
||||
| `fsync()` | `file.flush()` |
|
||||
| `unlinkat()` | `dir.remove(name)` or `dir.remove_dir(name)` |
|
||||
| `fcntl()` | Return handle flags |
|
||||
| `fpath()` | Return mounted_path + handle path |
|
||||
| `on_close()` | Remove from handle map |
|
||||
|
||||
**Permission mapping**: FAT has limited permissions (read-only, hidden, system,
|
||||
archive). Map to Unix permissions:
|
||||
- Read-only attribute → `mode & !0o222`
|
||||
- Otherwise → `0o644` for files, `0o755` for directories
|
||||
- Owner/group always 0 (FAT has no ownership concept)
|
||||
- Timestamps from FAT directory entry (2-second precision, date range 1980–2107)
|
||||
|
||||
**Error mapping** (fatfs error → syscall error):
|
||||
```rust
|
||||
fn fat_error(err: fatfs::Error<impl std::fmt::Debug>) -> syscall::error::Error {
|
||||
match err {
|
||||
fatfs::Error::NotFound => Error::new(ENOENT),
|
||||
fatfs::Error::AlreadyExists => Error::new(EEXIST),
|
||||
fatfs::Error::InvalidInput => Error::new(EINVAL),
|
||||
fatfs::Error::IsDirectory => Error::new(EISDIR),
|
||||
fatfs::Error::NotDirectory => Error::new(ENOTDIR),
|
||||
fatfs::Error::DirectoryNotEmpty => Error::new(ENOTEMPTY),
|
||||
fatfs::Error::WriteZero => Error::new(ENOSPC),
|
||||
fatfs::Error::UnexpectedEof => Error::new(EIO),
|
||||
_ => Error::new(EIO),
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**`main.rs`** — Daemon lifecycle:
|
||||
- Parse args: `fatd [--no-daemon] <disk_path> <mountpoint>`
|
||||
- Fork (optional daemonization)
|
||||
- Install SIGTERM handler for clean unmount
|
||||
- Open block device → create BufStream → `fatfs::FileSystem::new()`
|
||||
- Call `mount::mount()` to register scheme and enter event loop
|
||||
- On SIGTERM: `fs.unmount()` (or just drop — fatfs flushes on drop)
|
||||
|
||||
**`mount.rs`** — Event loop (identical pattern to ext4d mount.rs):
|
||||
- `Socket::create()`
|
||||
- `register_sync_scheme(&socket, mountpoint, &mut scheme)`
|
||||
- Loop: `socket.next_request(SignalBehavior::Restart)` → dispatch to scheme
|
||||
- On exit: `scheme.cleanup()` for clean unmount
|
||||
|
||||
#### 1.4 LFN Support
|
||||
|
||||
The `fatfs` crate handles LFN transparently when the `lfn` feature is enabled:
|
||||
|
||||
```toml
|
||||
fatfs = { version = "0.3.6", default-features = false, features = ["lfn", "alloc"] }
|
||||
```
|
||||
|
||||
This provides:
|
||||
- Long filename read via `DirEntry::file_name()` (returns full long name)
|
||||
- Long filename write on `Dir::create_file()` and `Dir::create_dir()`
|
||||
- Automatic 8.3 short name generation (e.g., "MYLONG~1.TXT")
|
||||
- LFN checksum computation (handled internally)
|
||||
|
||||
**No special LFN code needed in the scheme daemon** — `fatfs` abstracts it away.
|
||||
The scheme daemon just passes filenames through.
|
||||
|
||||
#### 1.5 FAT12/16/32 Auto-Detection
|
||||
|
||||
`fatfs::FileSystem::new()` automatically detects FAT12, FAT16, or FAT32 based on
|
||||
the BPB (BIOS Parameter Block) in the first sector. No explicit type selection needed.
|
||||
|
||||
`fatfs::format_volume()` with `FormatVolumeOptions::new()` auto-selects FAT type
|
||||
based on volume size:
|
||||
- < 16 MB → FAT12 (or FAT16)
|
||||
- 16 MB – 32 MB → FAT16
|
||||
- > 32 MB → FAT32
|
||||
|
||||
Explicit type selection: `FormatVolumeOptions::new().fat_type(FatType::Fat32)`.
|
||||
|
||||
### Phase 2: Management Tools — 2–3 weeks
|
||||
|
||||
#### 2.1 `fat-mkfs` — Create FAT Filesystems
|
||||
|
||||
**Binary**: `fat-mkfs <device> [options]`
|
||||
|
||||
Options:
|
||||
- `-F <12|16|32>` — Force FAT type (default: auto)
|
||||
- `-n <label>` — Volume label (max 11 chars)
|
||||
- `-s <sectors_per_cluster>` — Cluster size
|
||||
- `-r <reserved_sectors>` — Reserved sector count
|
||||
- `-f <num_fats>` — Number of FATs (default: 2)
|
||||
|
||||
Implementation:
|
||||
```rust
|
||||
let disk = FileDisk::open(device)?;
|
||||
let options = fatfs::FormatVolumeOptions::new()
|
||||
.fat_type(fat_type)
|
||||
.volume_label(label);
|
||||
fatfs::format_volume(&mut disk, options)?;
|
||||
```
|
||||
|
||||
Also: `fat-mkfs` should be usable on the build host for creating test images
|
||||
and EFI System Partitions during development.
|
||||
|
||||
#### 2.2 `fat-label` — Read/Write Volume Labels
|
||||
|
||||
**Binary**: `fat-label <device> [new_label]`
|
||||
|
||||
- Without `new_label`: print current volume label
|
||||
- With `-s "LABEL"`: set volume label (max 11 chars, uppercase)
|
||||
- With `-s ""`: clear volume label
|
||||
|
||||
**Current status**: Read mode ✅ complete and tested. Write mode in progress
|
||||
(direct BPB modification since fatfs v0.3 lacks `set_volume_label()`).
|
||||
|
||||
Implementation for write:
|
||||
```rust
|
||||
// Read: fs.volume_label() returns String (works)
|
||||
// Write: direct BPB modification at offset 43 (FAT12/16) or 71 (FAT32)
|
||||
// FAT type detection: root_entry_count == 0 && fat_size_32 != 0 → FAT32
|
||||
// Label padded to 11 bytes with 0x20, uppercased
|
||||
```
|
||||
|
||||
#### 2.3 `fat-check` — FAT Filesystem Checker
|
||||
|
||||
**Phase 2a: Verifier (read-only)** — ✅ Complete
|
||||
|
||||
Checks performed (no modifications):
|
||||
1. **BPB validation** — sector size, cluster size, FAT size consistency ✅
|
||||
2. **Directory structure** — valid entries, tree walking ✅
|
||||
3. **Cluster stats** — total/free/used clusters via fatfs ✅
|
||||
4. **Boot sector signature** — 0x55 0xAA check ✅
|
||||
5. **FAT type detection** — FAT12/16/32 classification ✅
|
||||
|
||||
Output: report of all issues found, severity (info/warning/error).
|
||||
Tested against clean and corrupt images.
|
||||
|
||||
**Phase 2b: Safe Repairs** — ✅ Complete
|
||||
|
||||
Safe repairs (non-destructive, `--repair` flag):
|
||||
1. **Dirty flag handling** — clear dirty bit on FAT12/16/32 cluster 1 entries ✅
|
||||
2. **FSInfo repair** — recount free clusters, update FSInfo sector ✅
|
||||
3. **Lost cluster recovery** — reclaim lost clusters (mark free in FAT) ✅
|
||||
4. **Orphaned LFN cleanup** — remove LFN entries without matching SFN ✅
|
||||
|
||||
Exit codes: 0 = clean, 1 = errors remain, 2 = repairs were made.
|
||||
|
||||
**Out of scope for initial version:**
|
||||
- Cross-linked file repair
|
||||
- Directory entry reconstruction
|
||||
- Deep FAT table repair
|
||||
- File data recovery
|
||||
|
||||
### Phase 3: Installer & Build Integration — 1 week
|
||||
|
||||
#### 3.1 Installer ESP Access (already works)
|
||||
|
||||
The installer already uses `fatfs` to format and write the EFI partition. This is
|
||||
host-side and already functional. No changes needed for basic ESP creation.
|
||||
|
||||
#### 3.2 Recipe Configuration
|
||||
|
||||
Add `fatd` and tools to relevant config files:
|
||||
|
||||
```toml
|
||||
# config/desktop.toml or redbear-desktop.toml
|
||||
fatd = {}
|
||||
fat-mkfs = {}
|
||||
fat-label = {}
|
||||
fat-check = {}
|
||||
```
|
||||
|
||||
#### 3.3 Init Service
|
||||
|
||||
Create a Redox init service for auto-mounting FAT volumes. Follow the pattern in
|
||||
`config/redbear-device-services.toml` and `config/redbear-netctl.toml`: services are
|
||||
defined as `[[files]]` TOML blocks with paths under `/usr/lib/init.d/`, using the
|
||||
`[unit]` + `[service]` format with `cmd`, `args`, and `type` fields.
|
||||
|
||||
**File**: `config/redbear-device-services.toml` (append to existing file)
|
||||
|
||||
```toml
|
||||
[[files]]
|
||||
path = "/usr/lib/init.d/15_fatd.service"
|
||||
data = """
|
||||
[unit]
|
||||
description = "FAT filesystem auto-mount daemon"
|
||||
requires_weak = [
|
||||
"00_pcid-spawner.service",
|
||||
]
|
||||
|
||||
[service]
|
||||
cmd = "fatd"
|
||||
args = ["disk/live-virtio", "fat-live"]
|
||||
type = { scheme = "fat-live" }
|
||||
"""
|
||||
```
|
||||
|
||||
For runtime auto-mount of removable devices (USB, SD), a separate `redbear-automount`
|
||||
service would watch `/scheme/disk/` for new block devices, probe for FAT signatures,
|
||||
and launch `fatd` instances dynamically. This follows the same `[unit]`/`[service]`
|
||||
TOML pattern. Reference implementation: `config/redbear-device-services.toml` lines
|
||||
14–26 (`05_firmware-loader.service` uses `type = { scheme = "firmware" }`).
|
||||
|
||||
### Phase 4: Runtime Auto-Mount & Desktop Integration — 1–2 weeks
|
||||
|
||||
#### 4.1 Block Device Discovery
|
||||
|
||||
When a block device appears (USB insertion, SD card detect), a service should:
|
||||
1. Detect new block device via `/scheme/disk/` or equivalent
|
||||
2. Probe for FAT filesystem (read first sector, check for valid BPB signature)
|
||||
3. If FAT detected, launch `fatd <device> <scheme_name>`
|
||||
4. The FAT filesystem becomes accessible at `/scheme/<scheme_name>/`
|
||||
|
||||
#### 4.2 Unmount Handling
|
||||
|
||||
On device removal or system shutdown:
|
||||
1. Send SIGTERM to `fatd` daemon
|
||||
2. Daemon flushes and drops `fatfs::FileSystem` (auto-flush on drop)
|
||||
3. Scheme is unregistered
|
||||
|
||||
#### 4.3 Desktop File Manager Integration
|
||||
|
||||
For the KDE Plasma desktop path (Phases 3–4 of the desktop plan):
|
||||
- Solid/UDisks2 backend recognizes mounted FAT volumes
|
||||
- Volume labels displayed in file manager
|
||||
- "Safely remove" triggers clean unmount via SIGTERM to fatd
|
||||
|
||||
### Phase 5: Testing & Hardening — 1 week
|
||||
|
||||
#### 5.1 Unit Tests
|
||||
|
||||
Test against FAT images created with `fat-mkfs`:
|
||||
- Create/read/write/delete files with short names
|
||||
- Create/read/write/delete files with long names (LFN)
|
||||
- Create/remove directories
|
||||
- Rename files and directories
|
||||
- Read filesystem stats (fstatvfs)
|
||||
- Handle full filesystem (ENOSPC)
|
||||
- Handle read-only filesystem (EROFS)
|
||||
|
||||
#### 5.2 Edge Cases
|
||||
|
||||
From the `fatfs` crate's bug history and FAT specification:
|
||||
- **0xE5 first byte**: Short names starting with 0xE5 are stored as 0x05
|
||||
- **FSInfo unreliability**: Never trust FSInfo free count blindly
|
||||
- **FAT32 upper 4 bits**: Must be preserved when writing FAT entries
|
||||
- **LFN checksum**: Must verify against SFN to detect orphaned entries
|
||||
- **Max path length**: FAT LFN max is 255 characters
|
||||
- **Case sensitivity**: FAT is case-insensitive, must normalize lookups
|
||||
- **Fragmentation**: Large fragmented files should still read/write correctly
|
||||
- **Timestamp precision**: 2-second granularity, 1980–2107 date range
|
||||
|
||||
#### 5.3 Compatibility Testing
|
||||
|
||||
Test with FAT images from:
|
||||
- Windows 10/11 formatted USB drives
|
||||
- Linux `mkfs.fat` created images
|
||||
- macOS formatted FAT32 SD cards
|
||||
- Digital camera FAT32 SD cards (often fragmented)
|
||||
- Large FAT32 volumes (128 GB+ SD cards)
|
||||
|
||||
## 4. Task Breakdown for Delegation
|
||||
|
||||
### Wave 1: Foundation (Phase 1.1–1.2) — Parallel
|
||||
|
||||
| Task | Category | Effort | Dependencies | QA |
|
||||
|------|----------|--------|--------------|-----|
|
||||
| Create workspace structure, Cargo.toml, recipe.toml, symlinks | quick | 30 min | None | `cargo check --target x86_64-unknown-redox` succeeds from workspace root; `ls -la recipes/core/fatd` shows valid symlink |
|
||||
| Implement `fat-blockdev` FileDisk (Linux) | unspecified-low | 2 hr | Workspace | Unit test: create 1 MB temp file, open via FileDisk, read 512 bytes at offset 0, verify zero-filled; seek to offset 1024, write pattern, read back, verify match |
|
||||
| Implement `fat-blockdev` RedoxDisk (Redox, feature-gated) | unspecified-low | 2 hr | Workspace | `cargo check --target x86_64-unknown-redox --features redox` succeeds; `cargo check` (Linux, no redox feature) also succeeds |
|
||||
|
||||
### Wave 2: Scheme Daemon (Phase 1.3–1.5) — Sequential on Wave 1
|
||||
|
||||
| Task | Category | Effort | Dependencies | QA |
|
||||
|------|----------|--------|--------------|-----|
|
||||
| Implement `handle.rs` (FileHandle, DirHandle, Handle) | unspecified-low | 1 hr | Wave 1 | `cargo check` passes; handle.path() returns correct path; handle.flags() returns O_RDONLY/O_WRONLY/O_RDWR as set |
|
||||
| Implement `scheme.rs` (FatScheme with SchemeSync) | unspecified-high | 2–3 days | Wave 1 | Integration test: create 10 MB FAT32 image via `fatfs::format_volume()`, mount via FatScheme, `openat` a file, `write` 100 bytes, `read` back 100 bytes, verify match; `getdents` on root dir returns "." and ".."; `fstat` returns st_mode with S_IFREG; `fstatvfs` returns non-zero f_blocks |
|
||||
| Implement `mount.rs` (event loop) | unspecified-low | 2 hr | scheme.rs | `cargo check` passes; verify event loop compiles with `register_sync_scheme` and `socket.next_request()` |
|
||||
| Implement `main.rs` (daemon lifecycle) | unspecified-low | 2 hr | mount.rs | Build `fatd` binary: `cargo build --bin fatd`; run `fatd --help` shows usage; run `fatd test.img test-scheme` with a FAT32 test image, verify scheme registered at `/scheme/test-scheme/` |
|
||||
| LFN integration testing | deep | 1 day | scheme.rs | Create file named "This Is A Very Long Filename.txt" (33 chars), read it back, verify full name returned; create file with 200-char name, verify LFN entries; create file with Unicode name "café_日本語.txt", verify round-trip |
|
||||
| FAT12/16/32 auto-detection testing | deep | 1 day | scheme.rs | Create three images (FAT12: 1 MB, FAT16: 16 MB, FAT32: 64 MB) via `fat-mkfs`, mount each via FatScheme, write and read a file on each, verify all three succeed |
|
||||
|
||||
### Wave 3: Management Tools (Phase 2) — Parallel after Wave 1
|
||||
|
||||
| Task | Category | Effort | Dependencies | QA |
|
||||
|------|----------|--------|--------------|-----|
|
||||
| Implement `fat-mkfs` binary | unspecified-low | 3 hr | fat-blockdev | Create 64 MB image: `fat-mkfs /tmp/test.img`; verify: `fatfs::FileSystem::new()` can mount it; verify: `fat-mkfs -F 32 /tmp/test32.img` creates FAT32; verify: `fat-mkfs -n TESTVOL /tmp/test.img` sets label |
|
||||
| Implement `fat-label` binary | unspecified-low | 3 hr | fat-blockdev | After `fat-mkfs -n TESTVOL /tmp/test.img`: `fat-label /tmp/test.img` prints "TESTVOL"; `fat-label /tmp/test.img NEWNAME` succeeds; `fat-label /tmp/test.img` prints "NEWNAME" |
|
||||
| Implement `fat-check` verifier (Phase 2a) | unspecified-high | 1 week | fat-blockdev | Run on clean image: exits 0, reports "filesystem clean"; corrupt FAT chain (write bad entry manually): `fat-check` detects and reports "cross-linked files" or "lost clusters"; run on image with orphaned LFN: reports "orphaned LFN entries" |
|
||||
| Implement `fat-check` safe-repair (Phase 2b) | unspecified-high | 1 week | Phase 2a | Corrupt FSInfo free count: `fat-check --repair` fixes it, re-run verifier exits 0; set dirty bit: `fat-check --repair` clears it |
|
||||
|
||||
### Wave 4: Integration (Phase 3–4) — Sequential on Waves 2–3
|
||||
|
||||
| Task | Category | Effort | Dependencies | QA |
|
||||
|------|----------|--------|--------------|-----|
|
||||
| Add fatd to config TOMLs | quick | 15 min | Wave 2 | `grep fatd config/redbear-desktop.toml` shows `fatd = {}`; `grep fatd config/redbear-full.toml` shows `fatd = {}` |
|
||||
| Create init service for FAT mounting | unspecified-low | 3 hr | Wave 2 | Service file exists at `/usr/lib/init.d/15_fatd.service` with `[unit]` and `[service]` sections; `cmd = "fatd"` present; `type = { scheme = "..." }` present; follows `config/redbear-device-services.toml` pattern exactly |
|
||||
| Build + test full integration | deep | 2 days | Waves 2–3 | `make all CONFIG_NAME=redbear-desktop` succeeds; boot in QEMU: `fatd --help` runs; create FAT image on host, attach to QEMU VM, verify `fatd` can mount it at `/scheme/fat-test/` |
|
||||
| Edge case + compatibility testing | deep | 3 days | Wave 2 | Test images: Windows-formatted FAT32 USB (4 GB), Linux mkfs.fat FAT16 (128 MB), macOS FAT32 SD (32 GB); all mount and read/write correctly via fatd |
|
||||
|
||||
## 5. Dependency Graph
|
||||
|
||||
```
|
||||
Phase 1.1 (workspace) ──┬──→ Phase 1.2 (blockdev) ──┬──→ Phase 1.3 (scheme daemon)
|
||||
│ │
|
||||
│ ├──→ Phase 2.1 (fat-mkfs)
|
||||
│ ├──→ Phase 2.2 (fat-label)
|
||||
│ └──→ Phase 2.3a (fat-check verify)
|
||||
│ │
|
||||
│ └──→ Phase 2.3b (fat-check repair)
|
||||
│
|
||||
Phase 1.3 ──────────────────────────────────────────→ Phase 3 (config/integration)
|
||||
│
|
||||
Phase 3 ──────────────────────────────────────────────→ Phase 4 (auto-mount)
|
||||
│
|
||||
Phase 4 + Phase 2 ───────────────────────────────────→ Phase 5 (testing)
|
||||
```
|
||||
|
||||
**Critical path**: Phase 1.1 → 1.2 → 1.3 → Phase 3 → Phase 4 → Phase 5
|
||||
|
||||
**Parallel opportunities**: Phase 2 tools can start after Phase 1.2 (blockdev),
|
||||
overlapping with Phase 1.3 (scheme daemon).
|
||||
|
||||
## 6. Technical Notes
|
||||
|
||||
### FAT Limitations in Unix Context
|
||||
|
||||
Since FAT is data/ESP only (not root), most Unix metadata issues are irrelevant:
|
||||
|
||||
| FAT Limitation | Impact for data volumes | Mitigation |
|
||||
|----------------|------------------------|------------|
|
||||
| No Unix permissions | Files appear as 0o644/0o755 | Acceptable for data volumes |
|
||||
| No symlinks | Cannot store symlinks | Data volumes don't need them |
|
||||
| No device nodes | Cannot store /dev entries | Data volumes don't need them |
|
||||
| No ownership | All files appear uid=0/gid=0 | Acceptable for data volumes |
|
||||
| 2s timestamp precision | Some timestamps rounded | Acceptable for data volumes |
|
||||
| 255 char filename max | No path component > 255 chars | Sufficient for data use |
|
||||
| Case-insensitive | Lookups must normalize | Scheme daemon handles this |
|
||||
| No sparse files | Holes consume disk space | Acceptable for data volumes |
|
||||
| Max file size: 4 GB - 1 | Large files may not fit | Acceptable for most use |
|
||||
|
||||
### `fatfs` Crate Feature Configuration
|
||||
|
||||
```toml
|
||||
[dependencies]
|
||||
# For the scheme daemon (full features)
|
||||
fatfs = { version = "0.3.6", default-features = false, features = ["lfn", "alloc", "log"] }
|
||||
|
||||
# For fat-mkfs (formatting support)
|
||||
fatfs = { version = "0.3.6", default-features = false, features = ["lfn", "alloc"] }
|
||||
|
||||
# For fat-check (read-only)
|
||||
fatfs = { version = "0.3.6", default-features = false, features = ["lfn", "alloc"] }
|
||||
```
|
||||
|
||||
Features available:
|
||||
- `lfn` — VFAT long filename support (REQUIRED)
|
||||
- `alloc` — Use alloc crate for dynamic allocation (REQUIRED for no_std)
|
||||
- `log` — Logging via `log` crate (optional, useful for debugging)
|
||||
- `chrono` — Timestamp creation via chrono (optional, not needed with our time adapter)
|
||||
- `std` — Use std library (NOT used — we want no_std compatibility)
|
||||
|
||||
### Block Caching Strategy
|
||||
|
||||
Without caching, `fatfs` performs one I/O operation per metadata read — extremely slow.
|
||||
The recommended approach:
|
||||
|
||||
```rust
|
||||
use fscommon::BufStream;
|
||||
|
||||
// Wrap raw disk in buffered stream
|
||||
let disk = RedoxDisk::open(disk_path)?;
|
||||
let buf_disk = BufStream::new(disk);
|
||||
|
||||
// fatfs operates on the buffered stream
|
||||
let fs = fatfs::FileSystem::new(buf_disk, fatfs::FsOptions::new())?;
|
||||
```
|
||||
|
||||
`BufStream` provides a configurable read/write buffer (default 512 bytes, should be
|
||||
increased to 4096 or larger for better throughput on block devices).
|
||||
|
||||
### Scheme Name Convention
|
||||
|
||||
Following the ext4d pattern:
|
||||
- `fatd /scheme/disk/0 disk-fat-0` registers scheme `disk-fat-0`
|
||||
- Access at `/scheme/disk-fat-0/path/to/file`
|
||||
- Multiple FAT volumes: `disk-fat-0`, `disk-fat-1`, etc.
|
||||
|
||||
Alternative: Use a single `fat` scheme namespace and multiplex based on the
|
||||
device path embedded in the mount command.
|
||||
|
||||
### Concurrency Model
|
||||
|
||||
`fatfs::FileSystem` is NOT thread-safe. The scheme daemon handles this by:
|
||||
1. Single-threaded event loop (same as ext4d)
|
||||
2. One `FileSystem` instance per daemon process
|
||||
3. Sequential request processing via `socket.next_request()`
|
||||
4. No internal mutability tricks needed
|
||||
|
||||
This matches the Redox scheme model — requests are serialized by the kernel.
|
||||
|
||||
## 7. Risks and Mitigations
|
||||
|
||||
| Risk | Probability | Impact | Mitigation |
|
||||
|------|-------------|--------|------------|
|
||||
| `fatfs` crate bug in LFN handling | Low | Medium | v0.3.6 has known fixes; test thoroughly |
|
||||
| Performance without caching | High | High | BufStream wrapper is mandatory, not optional |
|
||||
| FAT corruption on unsafe removal | Medium | High | Write-fat-sync on flush; journal not possible on FAT |
|
||||
| FAT32 max file size (4 GB) | Low | Low | Document limitation; return EFBIG for oversized writes |
|
||||
| `fatfs` API doesn't support needed operations | Low | Medium | Fall back to direct BPB/FAT manipulation |
|
||||
| Feature flag conflicts with no_std | Low | Medium | Test both Linux and Redox builds in CI |
|
||||
|
||||
## 8. Files to Create
|
||||
|
||||
```
|
||||
local/recipes/core/fatd/
|
||||
├── recipe.toml
|
||||
└── source/
|
||||
├── Cargo.toml ← Workspace root
|
||||
├── fat-blockdev/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ ├── lib.rs
|
||||
│ ├── file_disk.rs
|
||||
│ └── redox_disk.rs
|
||||
├── fatd/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ ├── main.rs
|
||||
│ ├── mount.rs
|
||||
│ ├── scheme.rs
|
||||
│ └── handle.rs
|
||||
├── fat-mkfs/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ └── main.rs
|
||||
├── fat-label/
|
||||
│ ├── Cargo.toml
|
||||
│ └── src/
|
||||
│ └── main.rs
|
||||
└── fat-check/
|
||||
├── Cargo.toml
|
||||
└── src/
|
||||
└── main.rs
|
||||
|
||||
recipes/core/fatd → ../../local/recipes/core/fatd (symlink, matching ext4d pattern)
|
||||
|
||||
config/redbear-desktop.toml ← add fatd, fat-mkfs, fat-label, fat-check packages
|
||||
config/redbear-full.toml ← same
|
||||
config/desktop.toml ← add fatd (upstream or local override)
|
||||
```
|
||||
|
||||
## 9. Estimated Timeline
|
||||
|
||||
| Phase | Duration | Deliverable |
|
||||
|-------|----------|-------------|
|
||||
| Phase 1: FAT scheme daemon | 3–4 weeks | `fatd` binary, mount/unmount FAT volumes |
|
||||
| Phase 2: Management tools | 2–3 weeks | `fat-mkfs`, `fat-label`, `fat-check` |
|
||||
| Phase 3: Build integration | 1 week | Config entries, recipe symlinks |
|
||||
| Phase 4: Auto-mount service | 1–2 weeks | Block device detection, auto-mount |
|
||||
| Phase 5: Testing & hardening | 1 week | Edge cases, compatibility |
|
||||
| **Total** | **8–11 weeks** | **Full VFAT support** |
|
||||
|
||||
Phase 2 can overlap with Phase 1.3, reducing wall-clock time to approximately
|
||||
**6–10 weeks** with parallel execution.
|
||||
|
||||
## 10. Success Criteria
|
||||
|
||||
- [x] `fatd` mounts FAT12, FAT16, and FAT32 filesystems as Redox schemes (compiles, links on Redox target only)
|
||||
- [x] Read/write files with both short (8.3) and long (LFN) filenames
|
||||
- [x] Create/delete files and directories
|
||||
- [x] Rename files and directories
|
||||
- [x] Correctly report filesystem stats (fstatvfs)
|
||||
- [x] `fat-mkfs` creates valid FAT filesystems usable by Windows/Linux/macOS
|
||||
- [x] `fat-label` reads and writes volume labels (BPB + root-directory entry updated)
|
||||
- [x] `fat-check` detects and reports FAT filesystem errors (verify + repair mode)
|
||||
- [x] Integration with Redox config system (TOML)
|
||||
- [x] (deferred: not on desktop critical path) Works on both Linux host (management tools ✅) and Redox target (fatd untested — requires runtime)
|
||||
- [x] No `unwrap()`/`expect()` in library/driver code
|
||||
- [x] (deferred: not on desktop critical path) Runtime auto-mount service (Phase 4 deferred to runtime validation)
|
||||
- [x] (deferred: not on desktop critical path) Runtime validation of fatd on Redox target (requires QEMU/bare metal boot)
|
||||
|
||||
## 11. Test Results
|
||||
|
||||
### Edge Case Testing (2026-04-17, Linux host)
|
||||
|
||||
| Test | Result | Notes |
|
||||
|------|--------|-------|
|
||||
| Corrupt boot signature (0x00 0x00) | ✅ Detected | Exit 1, reports "invalid boot sector signature" |
|
||||
| Zero bytes_per_sector | ✅ Detected | Exit 1, reports "invalid bytes per sector: 0" |
|
||||
| Tiny FAT12 (512KB) | ✅ Clean | Auto-detected as FAT16 by fat-check (fatfs classifies small volumes) |
|
||||
| Large FAT32 (256MB) | ✅ Clean | 516214 clusters, cluster size 512 bytes |
|
||||
| Very large FAT32 (1GB) | ✅ Clean | 261631 clusters, cluster size 4096 bytes (auto-selected) |
|
||||
| No volume label | ✅ | Reports "NO NAME" |
|
||||
| Max length label (11 chars) | ✅ | "12345678901" round-trips correctly |
|
||||
| Too-long label (12 chars) | ✅ Rejected | Exit 1, "volume label too long" |
|
||||
| Auto-detect FAT type (32MB) | ✅ | Selected FAT16 automatically |
|
||||
| Cross-platform (Linux mkfs.fat FAT32) | ⚠️ Partial | fatfs v0.3.6 rejects small mkfs.fat images (non-zero total_sectors_16 for FAT32 — fatfs strictness) |
|
||||
| FAT12 (1MB) | ✅ Clean | mkfs + check pass |
|
||||
| FAT16 (16MB) | ✅ Clean | mkfs + check pass |
|
||||
| FAT32 (64MB) | ✅ Clean | mkfs + check pass |
|
||||
| File creation on all FAT types | ✅ | 7 files + 1 dir created via fatfs on FAT12/16/32, all verified clean |
|
||||
| Label write on populated image | ✅ | No data corruption after label change, files still accessible |
|
||||
| FSInfo repair (FAT32) | ✅ | Detected mismatch (0xFFFFFFFF vs actual), repaired, re-check clean |
|
||||
| Repair on clean image (FAT16) | ✅ | "Repaired: nothing needed", exit 0 |
|
||||
| Directory count accuracy | ✅ | Fixed: files: 7, directories: 1 (was 0/0 due to tuple borrowing bug) |
|
||||
|
||||
**Known limitation**: `fatfs` v0.3.6 strictly requires `total_sectors_16 == 0` for FAT32,
|
||||
but Linux's `mkfs.fat` may set it non-zero for small FAT32 images. This is a fatfs crate
|
||||
strictness issue, not a Red Bear code bug. Files created by `fat-mkfs` are always accepted.
|
||||
|
||||
## 12. Quality Assessment (2026-04-17)
|
||||
|
||||
### 12.1 Code Metrics
|
||||
|
||||
| Crate | Lines | Files | `unwrap()` | `expect()` | `TODO/FIXME` | `#[cfg(test)]` |
|
||||
|-------|-------|-------|------------|------------|--------------|----------------|
|
||||
| fat-blockdev | 134 | 3 | 0 | 0 | 0 | 0 |
|
||||
| fatd | 1376 | 4 | 0 | 0 | 0 | 25 tests |
|
||||
| fat-mkfs | 158 | 1 | 0 | 0 | 0 | 0 |
|
||||
| fat-label | 436 | 1 | 0 | 0 | 0 | 7 tests |
|
||||
| fat-check | 1399 | 1 | 0 | 0 | 0 | 28 tests |
|
||||
| **Total** | **3503** | **10** | **0** | **0** | **0** | **60 tests** |
|
||||
|
||||
### 12.2 Anti-Patterns Found
|
||||
|
||||
| Severity | File | Line | Issue |
|
||||
|----------|------|------|-------|
|
||||
| ~~Medium~~ | ~~`fat-blockdev/src/file_disk.rs`~~ | ~~17~~ | ~~✅ Fixed: logs warning~~ |
|
||||
| ~~Medium~~ | ~~`fat-blockdev/src/redox_disk.rs`~~ | ~~26,32,38,50~~ | ~~✅ Fixed: preserves error details~~ |
|
||||
| ~~Medium~~ | ~~`fat-label/src/main.rs`~~ | ~~281-291~~ | ~~✅ Fixed: warns on full root dir~~ |
|
||||
| Low | `fatd/src/scheme.rs` | 633 | `handle.flags().unwrap_or(O_RDONLY)` silently defaults to read-only |
|
||||
| ~~Low~~ | ~~`fatd/src/scheme.rs`~~ | ~~214-220~~ | ~~✅ Fixed: dead code removed~~ |
|
||||
| Low | `fatd/src/main.rs` | 98,106,113 | `let _ = pipe.write_all(...)` silently ignores status pipe errors |
|
||||
| ~~Low~~ | ~~`fat-check/src/main.rs`~~ | ~~484~~ | ~~✅ Fixed: FAT12 dirty flag implemented~~ |
|
||||
| ~~Low~~ | ~~`fat-mkfs/src/main.rs`~~ | ~~72-82~~ | ~~✅ Fixed: pre-zero with 64K chunks~~ |
|
||||
|
||||
### 12.3 Functional Gaps vs Reference (ext4d)
|
||||
|
||||
| Operation | ext4d | fatd | Notes |
|
||||
|-----------|-------|------|-------|
|
||||
| `linkat` (hard links) | ✅ | ❌ | FAT doesn't support hard links — gap is by design |
|
||||
| `renameat` | ✅ | ✅ | `frename` via fatfs `Dir::rename()` — cross-directory rename supported |
|
||||
| `symlinkat`/`readlinkat` | ✅ | ❌ | FAT doesn't support symlinks — gap is by design |
|
||||
| `refresh_file_handle` | ✅ | ❌ | ext4d re-opens after truncate; fatd just seeks |
|
||||
| Directory non-empty check | ✅ | ✅ | `unlinkat` checks for entries before `AT_REMOVEDIR` |
|
||||
| Real inode numbers | ✅ | ⚠️ | fatd uses synthetic hash-based inodes |
|
||||
| `st_nlink` | ✅ | ⚠️ | Hardcoded to 1 (files) or 2 (dirs) |
|
||||
| `fsync` scope | Full FS | Single file | ext4d syncs entire filesystem |
|
||||
|
||||
### 12.4 Error Handling Quality
|
||||
|
||||
**Pattern**: CLI tools use `unwrap_or_else(\|e\| { eprintln!(...); process::exit(1) })` consistently.
|
||||
Daemon code uses `?` operator and `map_err(fat_error)` for syscall error conversion.
|
||||
|
||||
**Issue**: `fat_error()` in `scheme.rs:811-834` uses string matching on `io::Error` descriptions
|
||||
to map to syscall error codes. This is fragile — error message changes in fatfs would break it.
|
||||
ext4d's `ext4_error()` is simpler and more robust.
|
||||
|
||||
### 12.5 Missing Features vs Standard Linux Tools
|
||||
|
||||
#### fat-mkfs vs mkfs.fat
|
||||
| Option | mkfs.fat | fat-mkfs | Notes |
|
||||
|--------|----------|----------|-------|
|
||||
| Cluster size (`-s`) | ✅ | ✅ | `-c <sectors>` option, power-of-2 validation |
|
||||
| Reserved sectors (`-f`) | ✅ | ❌ | |
|
||||
| Number of FATs | ✅ | ❌ | Hardcoded to 2 |
|
||||
| Bytes per sector (`-S`) | ✅ | ❌ | Hardcoded to 512 |
|
||||
| Drive number | ✅ | ❌ | |
|
||||
| Backup boot sector | ✅ | ❌ | |
|
||||
| Media descriptor | ✅ | ❌ | Uses fatfs default (0xF8) |
|
||||
| Bad cluster check (`-c`) | ✅ | ❌ | |
|
||||
| Invariant mode (`-I`) | ✅ | ❌ | |
|
||||
| Pre-zeroing of image | ✅ | ✅ | 64K-chunk zero-fill |
|
||||
|
||||
#### fat-check vs fsck.fat
|
||||
| Check | fsck.fat | fat-check | Severity |
|
||||
|-------|----------|-----------|----------|
|
||||
| Media descriptor byte (BPB:21) | ✅ | ❌ | Medium |
|
||||
| FAT type string (BPB:54-61) | ✅ | ❌ | Low |
|
||||
| Cross-linked files | ✅ | ❌ | Medium |
|
||||
| Duplicate directory entries | ✅ | ❌ | Medium |
|
||||
| Invalid volume label chars | ✅ | ❌ | Low |
|
||||
| Timestamp validation | ✅ | ❌ | Low |
|
||||
| FSInfo reserved bits | ✅ | ❌ | Medium |
|
||||
| FAT32 fs_version field | ✅ | ❌ | Medium |
|
||||
| Automatic repair (`-a`) | ✅ | ❌ | Low |
|
||||
| FAT12 dirty flag | ✅ | ✅ | Bits 11:10 of cluster 1 entry |
|
||||
|
||||
### 12.6 Style Consistency
|
||||
|
||||
- Follows ext4d reference patterns closely (workspace layout, scheme structure, handle types)
|
||||
- Consistent naming: `snake_case` functions, `PascalCase` types
|
||||
- Error messages prefixed with binary name (`fat-label:`, `fat-check:`, etc.)
|
||||
- `rustfmt.toml` at workspace root: max_width=100, brace_style=SameLineWhere
|
||||
- 60 unit tests across 3 crates (25 scheme + 7 label + 28 check) + 13+ integration edge cases
|
||||
|
||||
### 12.7 Build Integration Assessment
|
||||
|
||||
| Check | Status | Notes |
|
||||
|-------|--------|-------|
|
||||
| `recipe.toml` correctness | ✅ | Custom template, COOKBOOK_CARGO_PATH for all 4 binaries |
|
||||
| Symlink `recipes/core/fatd` | ✅ | Points to `../../local/recipes/core/fatd` |
|
||||
| `redbear-device-services.toml` | ✅ | Packages + init service at `/usr/lib/init.d/15_fatd.service` |
|
||||
| Included in `redbear-desktop.toml` | ✅ | Via include chain |
|
||||
| Included in `redbear-full.toml` | ✅ | Via include chain |
|
||||
| Included in `redbear-minimal.toml` | ✅ | Via include chain |
|
||||
| Included in `redbear-full.toml` | ✅ | Via include chain |
|
||||
| Included in `redbear-wayland.toml` | ❌ | Does NOT include `redbear-device-services.toml` |
|
||||
| `cargo check` passes | ✅ | All crates check clean |
|
||||
| `cargo build --release` (tools) | ✅ | fat-mkfs, fat-label, fat-check build on Linux |
|
||||
| `cargo build --release` (fatd) | ⚠️ | Compiles but links only on Redox target (expected) |
|
||||
|
||||
### 12.8 Documentation Assessment
|
||||
|
||||
| Document | Accurate | Notes |
|
||||
|----------|----------|-------|
|
||||
| `VFAT-IMPLEMENTATION-PLAN.md` | ✅ | Status, success criteria, and test results all accurate |
|
||||
| `local/AGENTS.md` FAT section | ✅ | Workspace layout, tool status, limitations documented |
|
||||
| Success criteria checkboxes | ✅ | Done items checked, deferred items unchecked |
|
||||
| Test results table | ✅ | 13+ edge cases documented with outcomes |
|
||||
|
||||
### 12.9 Maturity Rating
|
||||
|
||||
| Dimension | Rating (1-5) | Notes |
|
||||
|-----------|-------------|-------|
|
||||
| Code correctness | 4 | Clean error handling, no unwrap/expect in daemon code |
|
||||
| Feature completeness | 4 | Rename + rmdir check + cluster size now implemented |
|
||||
| Test coverage | 4 | 60 unit tests + 13+ integration edge cases (helper-level, not end-to-end scheme tests) |
|
||||
| Code style | 4 | Consistent with ext4d reference, clean formatting |
|
||||
| Documentation | 4 | Comprehensive plan, accurate status, known limitations |
|
||||
| Build integration | 5 | Wired into 5/5 configs via `redbear-device-services.toml` include chain |
|
||||
| Error resilience | 3 | fatfs re-opens on each file access (no persistent handles) |
|
||||
| Production readiness | 2 | Not runtime-tested on Redox; Phase 4 auto-mount deferred |
|
||||
|
||||
**Overall**: 3.6/5 (provisional — pending runtime validation on Redox/QEMU). Solid implementation with good test coverage at the helper and tool level. fatd scheme daemon has not been runtime-tested.
|
||||
|
||||
### 12.10 Cleanup Status
|
||||
|
||||
| # | Cleanup | Status | Detail |
|
||||
|---|---------|--------|--------|
|
||||
| 1 | `redox_disk.rs` error discarding | ✅ Done | 3 read/write/flush `.map_err(\|_\|...)` replaced with `.map_err(\|e\| format!("redox {op}: {e:?}"))`; seek already had detail |
|
||||
| 2 | `file_disk.rs:17` silent failure | ✅ Done | Logs warning instead of silently returning 0 |
|
||||
| 3 | `fat-label` full-root-dir warning | ✅ Done | Both FAT32 and FAT12/16 paths warn when root dir full |
|
||||
| 4 | `scheme.rs:214-220` dead code | ✅ Done | Redundant uid==0 check removed |
|
||||
| 5 | Pre-zero image in `fat-mkfs` | ✅ Done | 64K-chunk zero-fill before format, no sparse files |
|
||||
| 6 | FAT12 dirty flag detection | ✅ Done | Bits 11:10 of cluster 1 entry; detect + repair verified |
|
||||
| 7 | `frename` support | ✅ Done | `Dir::rename()` for cross-directory rename, handle path updated post-rename |
|
||||
| 8 | Rmdir non-empty check | ✅ Done | `unlinkat` checks directory entries before AT_REMOVEDIR |
|
||||
| 9 | Cluster size option in `fat-mkfs` | ✅ Done | `-c <sectors>` with power-of-2 validation |
|
||||
| 10 | Unit test suite | ✅ Done | 60 tests across 3 crates (25 scheme + 7 label + 28 check) |
|
||||
| 11 | `lfn_checksum` overflow fix | ✅ Done | wrapping_add for u8 arithmetic, regression test added |
|
||||
|
||||
### 12.11 Remaining Improvements (Deferred)
|
||||
|
||||
1. **Runtime validate fatd on QEMU** — Boot Red Bear OS, mount a FAT image, perform read/write/rename ops
|
||||
2. ~~**Evaluate `redbear-wayland.toml` inclusion**~~ — Verified: wayland.toml includes redbear-device-services.toml, so FAT tools are in all 5 configs
|
||||
3. **`handle.flags().unwrap_or(O_RDONLY)`** — Low severity silent default in fcntl
|
||||
4. **`let _ = pipe.write_all(...)` in main.rs** — Low severity, hides daemon startup status pipe errors
|
||||
5. **`fsync` only flushes single file** — Doesn't sync filesystem metadata (by design: fatfs has no journal)
|
||||
6. **`fat_error()` string matching** — Medium severity; depends on exact fatfs error message text. Low risk on stable fatfs 0.3.6 but fragile across versions
|
||||
|
||||
### 12.12 Independent Audit Results (2026-04-17, 3rd pass)
|
||||
|
||||
Three parallel explore agents audited: (A) scheme daemon code quality vs ext4d reference, (B) management tools quality, (C) build integration and documentation accuracy.
|
||||
|
||||
**Scheme daemon audit (A):**
|
||||
- `fevent` error codes: Verified identical to ext4d — NOT a bug (EPERM = operation not supported, EBADF = bad fd)
|
||||
- `frename` permission checks: `lookup_parent` already enforces PERM_EXEC | PERM_WRITE on both source and destination parents
|
||||
- `fat_error` string matching: Known, documented, low risk on stable fatfs 0.3.6
|
||||
- `fsync` scope: By design — fatfs has no journal, single-file flush is appropriate
|
||||
- Handle path update after `frename`: Correctly implemented with `update_path()`
|
||||
- `unlinkat` non-empty check: Correct — iterates entries, returns ENOTEMPTY if any non-dot entry found
|
||||
- Match arm completeness: All SchemeSync trait methods fully implemented
|
||||
|
||||
**Management tools audit (B):**
|
||||
- `fat-mkfs`: Argument parsing complete (-F, -n, -s, -c), validation correct, pre-zeroing works
|
||||
- `fat-label`: BPB offset calculation correct (43 for FAT12/16, 71 for FAT32), root-dir entry creation verified
|
||||
- `fat-check`: BPB validation thorough, FAT chain walking correct, dirty flag logic correct for all FAT types
|
||||
- `lfn_checksum`: Wrapping arithmetic verified correct with known test vectors
|
||||
- Exit codes: 0=clean, 1=errors, 2=repaired — matches fsck conventions
|
||||
- Unit test vectors: All verified correct (FAT12/16/32 encoding, round-trip, classification)
|
||||
|
||||
**Build integration audit (C):**
|
||||
- All 5/5 redbear configs include `redbear-device-services.toml` via include chain (including redbear-wayland via wayland.toml)
|
||||
- Recipe symlink correct: `recipes/core/fatd → ../../local/recipes/core/fatd`
|
||||
- Workspace Cargo.toml: All 5 crates correctly configured (fixed stale `chrono` reference)
|
||||
- Init service at `/usr/lib/init.d/15_fatd.service` correct
|
||||
- AGENTS.md FAT section: Accurate
|
||||
- VFAT-IMPLEMENTATION-PLAN.md Sections 10/12: Accurate
|
||||
|
||||
**Audit conclusion**: No critical or high-severity issues found in implementation code. One medium doc accuracy issue corrected (redox_disk.rs error detail fix was claimed but not persisted — now actually applied). All code spot-checks passed. Remaining items are low severity and documented in Section 12.10.
|
||||
@@ -0,0 +1,320 @@
|
||||
# Zsh Porting Plan for Red Bear OS
|
||||
|
||||
**Status:** ✅ FULLY IMPLEMENTED — Production recipe builds, configs updated, WIP removed
|
||||
**Target:** zsh 5.9 (upstream stable tag `zsh-5.9`)
|
||||
**Recipe:** `recipes/shells/zsh/`
|
||||
**Build Result:** `cook zsh - successful` (CI=1, non-interactive)
|
||||
|
||||
---
|
||||
|
||||
## 1. Executive Summary
|
||||
|
||||
Zsh 5.9 has been successfully ported to Red Bear OS. The build produces a working `zsh` binary for `x86_64-unknown-redox` with:
|
||||
|
||||
- Full interactive shell support (ZLE line editor)
|
||||
- Completion system (`zsh/complete` built-in)
|
||||
- Parameter module (`zsh/parameter` built-in)
|
||||
- History and prompt expansion
|
||||
- Job control primitives (`setpgid`, `tcsetpgrp`)
|
||||
- Multibyte / UTF-8 support (`--enable-multibyte`)
|
||||
- System `malloc` (no custom allocator)
|
||||
- Static modules (no dynamic `.so` loading)
|
||||
- Manjaro-style system-wide configuration (`/etc/zsh/`, `/etc/skel/`)
|
||||
|
||||
The port required **one source patch** (`redox.patch`, ~150 lines) plus a deterministic `signames.c` generation step in the build script to work around cross-compilation limitations.
|
||||
|
||||
---
|
||||
|
||||
## 2. What Was Done
|
||||
|
||||
### 2.1 Recipe Created
|
||||
|
||||
**Location:** `recipes/shells/zsh/`
|
||||
|
||||
```
|
||||
recipes/shells/zsh/
|
||||
├── recipe.toml # Production recipe (custom template)
|
||||
├── redox.patch # Redox-specific source patches
|
||||
├── README.md # Redox-specific build and usage notes
|
||||
└── etc/ # Manjaro-style system-wide config files
|
||||
├── zsh/
|
||||
│ ├── zshenv
|
||||
│ ├── zprofile
|
||||
│ └── zshrc
|
||||
└── skel/
|
||||
├── .zprofile
|
||||
└── .zshrc
|
||||
```
|
||||
|
||||
### 2.2 Source
|
||||
|
||||
- **URL:** `https://github.com/zsh-users/zsh/archive/refs/tags/zsh-5.9.tar.gz`
|
||||
- **BLAKE3:** `a15b94fae03e87aba6fc6a27df3c98e610b85b0c7c0fc90248f07fdcb8816860`
|
||||
- **Patches applied:** `redox.patch`
|
||||
|
||||
### 2.3 Build Configuration
|
||||
|
||||
The recipe uses the `custom` template with explicit configure flags:
|
||||
|
||||
```bash
|
||||
COOKBOOK_CONFIGURE_FLAGS+=(
|
||||
--disable-gdbm
|
||||
--disable-pcre
|
||||
--disable-cap
|
||||
zsh_cv_sys_elf=no
|
||||
)
|
||||
```
|
||||
|
||||
**Rationale:**
|
||||
- `--disable-gdbm` — No gdbm package in base system.
|
||||
- `--disable-pcre` — PCRE library not wired as dependency for initial build; can be re-enabled later.
|
||||
- `--disable-cap` — No libcap (Linux capabilities).
|
||||
- `zsh_cv_sys_elf=no` — Redox does not use ELF-style shared library versioning.
|
||||
|
||||
**Signames workaround:** The cross-compilation environment cannot run the `signames1.awk` → `cpp` → `signames2.awk` pipeline natively. The build script pre-generates `signames.c` and `sigcount.h` deterministically using the host `gawk` and cross-compiler.
|
||||
|
||||
### 2.4 Patch Summary (`redox.patch`)
|
||||
|
||||
| File | Change | Reason |
|
||||
|------|--------|--------|
|
||||
| `configure.ac` | Cache `ac_cv_func_times=no` | `times()` missing in relibc |
|
||||
| `configure.ac` | Cache `ac_cv_func_setpgrp=no` | BSD `setpgrp()` missing; zsh falls back to `setpgid` |
|
||||
| `configure.ac` | Cache `ac_cv_func_killpg=no` | `killpg()` missing; zsh defines `kill(-pgrp,sig)` fallback |
|
||||
| `configure.ac` | Cache `ac_cv_func_initgroups=no` | Not available in relibc |
|
||||
| `configure.ac` | Cache `ac_cv_func_pathconf=no` | Not available in relibc |
|
||||
| `configure.ac` | Cache `ac_cv_func_sysconf=no` | Not available in relibc |
|
||||
| `configure.ac` | Cache `ac_cv_func_getrlimit=no` | Relibc has it, but configure probe may misdetect; safe to cache |
|
||||
| `configure.ac` | Cache `ac_cv_func_tcgetsid=no` | Relibc has it, but configure probe may misdetect; safe to cache |
|
||||
| `configure.ac` | Cache `ac_cv_func_tgetent=yes` | Available via ncursesw |
|
||||
| `configure.ac` | Cache `ac_cv_func_tigetflag=yes` | Available via ncursesw |
|
||||
| `configure.ac` | Cache `ac_cv_func_tigetnum=yes` | Available via ncursesw |
|
||||
| `configure.ac` | Cache `ac_cv_func_tigetstr=yes` | Available via ncursesw |
|
||||
| `configure.ac` | Cache `ac_cv_func_setupterm=yes` | Available via ncursesw |
|
||||
| `configure.ac` | Remove `AC_SEARCH_LIBS([tgetent], [tinfo curses ncurses])` | Redox uses ncursesw directly |
|
||||
| `configure.ac` | Remove `AC_SEARCH_LIBS([tigetstr], [tinfo curses ncurses])` | Redox uses ncursesw directly |
|
||||
| `configure.ac` | Remove `AC_SEARCH_LIBS([setupterm], [tinfo curses ncurses])` | Redox uses ncursesw directly |
|
||||
| `configure.ac` | Remove `AC_SEARCH_LIBS([del_curterm], [tinfo curses ncurses])` | Redox uses ncursesw directly |
|
||||
| `Src/rlimits.c` | Define `RLIM_NLIMITS` fallback | Relibc header may not define it |
|
||||
| `Src/rlimits.c` | Define `RLIM_SAVED_CUR` / `RLIM_SAVED_MAX` fallbacks | Relibc header may not define them |
|
||||
| `Src/rlimits.c` | Define `RLIMIT_NPTS` / `RLIMIT_SWAP` / `RLIMIT_KQUEUES` stubs | BSD-only limits not in relibc |
|
||||
| `Src/rlimits.c` | Define `RLIMIT_RTTIME` stub | Linux-only limit not in relibc |
|
||||
| `Src/rlimits.c` | Define `RLIMIT_NICE` / `RLIMIT_MSGQUEUE` / `RLIMIT_RTPRIO` stubs | Linux-only limits not in relibc |
|
||||
| `Src/rlimits.c` | Define `RLIMIT_NLIMITS` as 16 if still undefined | Final fallback |
|
||||
| `Src/params.c` | Guard `getpwnam`/`getpwuid` return value | Relibc returns basic structs; add NULL checks |
|
||||
| `Src/Modules/termcap.c` | Link against `ncursesw` not `termcap` | Redox has ncursesw, not standalone termcap |
|
||||
| `Src/Modules/clone.c` | Disable `clone` module | `clone()` / `unshare()` not available on Redox |
|
||||
| `Src/Modules/zpty.c` | Disable `zpty` module | `openpty` / `forkpty` not available on Redox |
|
||||
|
||||
### 2.5 Config Files Updated
|
||||
|
||||
- `config/redbear-full.toml` — Added `"zsh"` to `[packages]`
|
||||
- `config/redbear-mini.toml` — Added `"zsh"` to `[packages]`
|
||||
|
||||
### 2.6 WIP Recipe Removed
|
||||
|
||||
- `recipes/wip/shells/zsh/` — Removed after successful migration to production.
|
||||
|
||||
---
|
||||
|
||||
## 3. Build Verification
|
||||
|
||||
### 3.1 Build Command
|
||||
|
||||
```bash
|
||||
CI=1 ./target/release/repo cook zsh
|
||||
```
|
||||
|
||||
### 3.2 Build Output
|
||||
|
||||
```
|
||||
cook zsh - successful
|
||||
repo - publishing zsh
|
||||
repo - generating repo.toml
|
||||
```
|
||||
|
||||
### 3.3 Staged Artifacts
|
||||
|
||||
```
|
||||
stage/
|
||||
├── etc/
|
||||
│ ├── zsh/
|
||||
│ │ ├── zshenv # System-wide env setup
|
||||
│ │ ├── zprofile # System-wide profile
|
||||
│ │ └── zshrc # System-wide interactive config
|
||||
│ └── skel/
|
||||
│ ├── .zprofile # New-user template
|
||||
│ └── .zshrc # New-user interactive config
|
||||
└── usr/
|
||||
├── bin/
|
||||
│ ├── zsh # → zsh-5.9 (symlink)
|
||||
│ └── zsh-5.9 # Actual binary (~1.2 MB stripped)
|
||||
└── share/
|
||||
└── zsh/
|
||||
├── 5.9/
|
||||
│ └── functions/ # 800+ completion functions
|
||||
└── site-functions/ # Site-local completions
|
||||
```
|
||||
|
||||
### 3.4 Binary Check
|
||||
|
||||
```bash
|
||||
$ file zsh
|
||||
zsh: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, stripped
|
||||
|
||||
$ ls -la zsh
|
||||
-rwxr-xr-x 1 kellito kellito 1267176 Apr 26 02:14 zsh
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 4. POSIX Dependency Matrix (Actual vs Planned)
|
||||
|
||||
| API / Feature | Planned Action | Actual Result |
|
||||
|---------------|---------------|---------------|
|
||||
| `getrlimit` / `setrlimit` | Remove obsolete cache | Cached `no` for safety; relibc has it |
|
||||
| `times` | Cache `ac_cv_func_times=no` | ✅ Cached; zsh uses `getrusage` fallback |
|
||||
| `tcgetsid` | Remove obsolete cache | Cached `no` for safety; relibc has it |
|
||||
| `setpgrp()` | Cache `ac_cv_func_setpgrp=no` | ✅ Cached; zsh falls back to `setpgid` |
|
||||
| `killpg` | Cache `ac_cv_func_killpg=no` | ✅ Cached; zsh defines `kill(-pgrp,sig)` |
|
||||
| `initgroups` | Cache if missing | ✅ Cached `no` |
|
||||
| `pathconf` / `sysconf` | Cache if missing | ✅ Cached `no` |
|
||||
| `RLIM_NLIMITS` | Patch if missing | ✅ Defined fallback in `rlimits.c` |
|
||||
| `tgetent` / `setupterm` | Cache `yes` | ✅ Cached `yes`; linked via ncursesw |
|
||||
| `dlopen` / `dlsym` | Start with `--disable-dynamic` | ✅ Static build; dynamic deferred |
|
||||
| `pcre_compile` | Start without, then enable | ✅ Disabled for initial build |
|
||||
| `locale` / `nl_langinfo` | `--enable-multibyte` | ✅ Enabled by default |
|
||||
| `getpwnam` / `getpwuid` | Add NULL guards | ✅ Patched in `params.c` |
|
||||
| `zpty` module | Disable if needed | ✅ Disabled in `zpty.c` |
|
||||
| `clone` module | Disable if needed | ✅ Disabled in `clone.c` |
|
||||
|
||||
---
|
||||
|
||||
## 5. Deviations from Original Plan
|
||||
|
||||
| Original Plan | What Actually Happened | Reason |
|
||||
|---------------|------------------------|--------|
|
||||
| Use `configure` template | Used `custom` template | Needed deterministic `signames.c` generation step |
|
||||
| Depend on `pcre` | No `pcre` dependency | Simpler initial build; can add later |
|
||||
| `--disable-dynamic` | Implicitly static | No `--enable-dynamic` flag passed; modules are built-in |
|
||||
| `--enable-zsh-mem=no` | Not needed | Default behavior uses system malloc |
|
||||
| `--enable-zsh-secure-free=no` | Not needed | Default behavior is safe |
|
||||
| `--with-tcsetpgrp` | Not needed | Auto-detected correctly |
|
||||
| Separate `config.site` | Patches embedded in `redox.patch` | Cleaner single-file approach |
|
||||
| `git` source | `tar` source with BLAKE3 | Faster fetch, reproducible builds |
|
||||
|
||||
---
|
||||
|
||||
## 6. Runtime Validation (Pending)
|
||||
|
||||
The following acceptance criteria have **not yet been verified** in QEMU/bare metal:
|
||||
|
||||
| # | Criterion | Status |
|
||||
|---|-----------|--------|
|
||||
| 1 | `zsh` binary compiles and links for `x86_64-unknown-redox` | ✅ Verified |
|
||||
| 2 | `zsh -c 'echo hello'` runs in QEMU without crash | ⏳ Pending |
|
||||
| 3 | Interactive prompt (`zsh -f`) accepts input and executes commands | ⏳ Pending |
|
||||
| 4 | `ulimit`, `cd`, `echo`, `for`, `if`, `function` builtins work | ⏳ Pending |
|
||||
| 5 | History file (`HISTFILE`) persists across sessions | ⏳ Pending |
|
||||
| 6 | Tab completion (`zle`) functions without crash | ⏳ Pending |
|
||||
| 7 | Job control (`set -m`, `fg`, `bg`, `jobs`) works | ⏳ Pending |
|
||||
| 8 | PCRE module (`zsh/pcre`) loads and `=~` works | ⏳ Deferred |
|
||||
| 9 | Dynamic modules load via `zmodload` | ⏳ Deferred |
|
||||
| 10 | Added to `redbear-full.toml` and `redbear-mini.toml` | ✅ Done |
|
||||
|
||||
### 6.1 Runtime Test Commands
|
||||
|
||||
```bash
|
||||
# Build full image
|
||||
make all CONFIG_NAME=redbear-full
|
||||
|
||||
# Run in QEMU
|
||||
make qemu CONFIG_NAME=redbear-full
|
||||
|
||||
# Inside QEMU:
|
||||
zsh -c 'echo hello' # Basic execution
|
||||
zsh -f # Interactive without user config
|
||||
print -P '%n@%m %~ %# ' # Prompt expansion
|
||||
for i in 1 2 3; do echo $i; done # Loop
|
||||
function hello { echo "hi $1" }; hello world # Function
|
||||
ulimit -a # Resource limits
|
||||
bindkey # Key bindings
|
||||
echo "test" > /tmp/hist; fc -R /tmp/hist # History
|
||||
touch /tmp/file{A,B,C}; ls /tmp/file<TAB> # Completion
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 7. Future Work
|
||||
|
||||
### 7.1 Feature Expansion
|
||||
|
||||
| Feature | Action | Priority |
|
||||
|---------|--------|----------|
|
||||
| PCRE support | Add `pcre` dependency, enable `--enable-pcre` | Low |
|
||||
| Dynamic modules | Enable `--enable-dynamic`, verify `dlopen` | Low |
|
||||
| `zpty` module | Implement `openpty` in relibc or patch zpty | Low |
|
||||
| `clone` module | Implement `clone` in relibc or keep disabled | Low |
|
||||
| GDBM support | Add `gdbm` recipe, enable `--enable-gdbm` | Very Low |
|
||||
|
||||
### 7.2 Integration
|
||||
|
||||
| Task | Location | Status |
|
||||
|------|----------|--------|
|
||||
| Add `/usr/bin/zsh` to `/etc/shells` | `recipes/core/userutils` or `local/recipes/branding/redbear-release` | ⏳ Pending |
|
||||
| `chsh` support | `recipes/core/userutils` | ⏳ Pending |
|
||||
| Set zsh as default shell | `config/redbear-full.toml` `[users]` section | ⏳ Pending |
|
||||
|
||||
---
|
||||
|
||||
## 8. Files
|
||||
|
||||
### Created
|
||||
|
||||
```
|
||||
recipes/shells/zsh/recipe.toml
|
||||
recipes/shells/zsh/redox.patch
|
||||
recipes/shells/zsh/README.md
|
||||
recipes/shells/zsh/etc/zsh/zshenv
|
||||
recipes/shells/zsh/etc/zsh/zprofile
|
||||
recipes/shells/zsh/etc/zsh/zshrc
|
||||
recipes/shells/zsh/etc/skel/.zprofile
|
||||
recipes/shells/zsh/etc/skel/.zshrc
|
||||
```
|
||||
|
||||
### Modified
|
||||
|
||||
```
|
||||
config/redbear-full.toml
|
||||
config/redbear-mini.toml
|
||||
local/docs/ZSH-PORTING-PLAN.md
|
||||
```
|
||||
|
||||
### Removed
|
||||
|
||||
```
|
||||
recipes/wip/shells/zsh/ (entire directory)
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 9. Quick Reference
|
||||
|
||||
```bash
|
||||
# Build zsh
|
||||
CI=1 ./target/release/repo cook zsh
|
||||
|
||||
# Build full image with zsh
|
||||
make all CONFIG_NAME=redbear-full
|
||||
|
||||
# Test in QEMU
|
||||
make qemu CONFIG_NAME=redbear-full
|
||||
|
||||
# Clean and rebuild
|
||||
rm -rf recipes/shells/zsh/target
|
||||
CI=1 ./target/release/repo cook zsh
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
*Document version: 2.0 — Implementation complete*
|
||||
*Last updated: 2026-04-26*
|
||||
Reference in New Issue
Block a user