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Clean up build system and update documentation

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- Updated README.md to reflect current single-stage build architecture
- Removed obsolete scripts/build-boot.sh (unused two-stage boot approach)
- Updated cleanup.sh to remove reference to non-existent setup-submodules.sh
- Documented smart caching and component compilation workflow
- Added proper build variants (minimal vs full) documentation
This commit is contained in:
Jan De Landtsheer
2025-08-18 14:41:46 +02:00
parent e402de625d
commit e13034810d
4 changed files with 143 additions and 258 deletions
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206
README.md
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@@ -7,10 +7,10 @@ Modern Alpine Linux based approach to building Zero-OS initramfs with source com
This system uses: This system uses:
- **Alpine Linux 3.22** as base system with latest packages - **Alpine Linux 3.22** as base system with latest packages
- **Individual Rust workspaces** with git subtrees for Zero-OS components (zinit, mycelium, rfs) - **Individual Rust workspaces** with git subtrees for Zero-OS components (zinit, mycelium, rfs)
- **Component-based compilation** - each component built in its own workspace - **Component-based compilation** - each component built from source in its own workspace
- **Alpine packages** for system tools (busybox, openssh, btrfs-progs, etc.) - **Alpine packages** for system tools (busybox, openssh, btrfs-progs, etc.)
- **Smart caching** with Docker layers and volumes - **Smart caching** with Docker layers and volumes for fast rebuilds
- **Same init flow** as original Zero-OS - **Single-stage initramfs** with minimal (~50MB) or full (~700MB) variants
## Directory Structure ## Directory Structure
@@ -21,116 +21,138 @@ alpine-initramfs/
│ ├── Dockerfile.cached # Multi-stage cached build │ ├── Dockerfile.cached # Multi-stage cached build
│ └── docker-compose.yml # Build orchestration with caching │ └── docker-compose.yml # Build orchestration with caching
├── components/ # Git subtrees (individual workspaces) ├── components/ # Git subtrees (individual workspaces)
│ ├── zinit/ # Init system (Rust subtree with workspace) │ ├── zinit/ # Init system (Rust workspace)
│ ├── mycelium/ # Networking layer (Rust subtree with workspace) │ ├── mycelium/ # Networking layer (Rust workspace)
│ └── rfs/ # Filesystem (Rust subtree with workspace) │ └── rfs/ # Filesystem (Rust workspace)
├── configs/ # Configuration files ├── configs/ # Configuration files
│ ├── packages-alpine.txt # Alpine packages to install │ ├── packages-alpine.txt # Full Alpine packages (~700MB)
│ ├── packages-minimal.txt # Minimal packages (~50MB)
│ ├── kernel-version # Kernel version to build │ ├── kernel-version # Kernel version to build
│ ├── kernel-config-generic # Kernel configuration │ ├── kernel-config-generic # Kernel configuration
│ ├── init # Init script (Alpine → zinit) │ ├── init # Init script (Alpine → zinit)
│ └── zinit/ # Zinit service configurations │ └── zinit/ # Zinit service configurations
├── scripts/ # Build scripts ├── scripts/ # Build scripts
│ ├── build-initramfs.sh # Main build orchestrator │ ├── build-smart.sh # Smart build with caching (main orchestrator)
│ ├── compile-components.sh # Compile Rust workspace │ ├── compile-components.sh # Compile Rust components from source
│ ├── fetch-github.sh # Download CoreX binary
│ ├── install-packages.sh # Install Alpine packages │ ├── install-packages.sh # Install Alpine packages
│ ├── setup-initramfs.sh # Create initramfs structure │ ├── setup-initramfs.sh # Create initramfs structure and archive
│ ├── build-kernel.sh # Build kernel with embedded initramfs │ ├── build-kernel.sh # Build kernel with embedded initramfs
│ ├── build-smart.sh # Smart build with caching
│ └── cleanup.sh # Clean build artifacts │ └── cleanup.sh # Clean build artifacts
├── target/ # Rust workspace build artifacts
├── output/ # Final build outputs ├── output/ # Final build outputs
│ ├── vmlinuz.efi # Final bootable kernel │ ├── vmlinuz.efi # Final bootable kernel
│ ├── initramfs.cpio.xz # Generated initramfs │ ├── initramfs.cpio.xz # Generated initramfs archive
│ └── version.txt # Build information │ └── compiled binaries # Individual component binaries
└── docs/ # Documentation └── cache/ # Build cache for smart rebuilds
├── BUILD.md # Build process guide ├── components-marker # Component build cache marker
├── OVERVIEW.md # Architecture overview └── kernel-marker # Kernel build cache marker
└── *.md # Additional documentation
``` ```
## Build Flow ## Build Flow
1. **Environment Setup**: Alpine Docker container with Rust and build tools The build system uses intelligent caching to minimize rebuild time:
2. **Component Compilation**: Individual cargo builds for each Rust component
3. **Binary Downloads**: Download CoreX (Go binary) from GitHub releases 1. **Smart Analysis**: Check what components need rebuilding based on file changes
4. **Package Installation**: Install Alpine packages to initramfs root 2. **Component Compilation**: Build only changed Rust components (zinit, mycelium, rfs)
5. **Initramfs Assembly**: Create filesystem structure with compiled binaries 3. **Package Installation**: Install Alpine packages to initramfs root
6. **Kernel Build**: Compile kernel with embedded initramfs 4. **Initramfs Assembly**: Create filesystem structure with compiled binaries
7. **Output**: Generate bootable vmlinuz.efi 5. **Kernel Build**: Compile kernel only if config/version changed
6. **Final Assembly**: Embed initramfs into kernel → bootable vmlinuz.efi
## Quick Start ## Quick Start
### Full Build ### Build Everything
```bash ```bash
# Build everything # Build with default settings (debug mode, full packages)
./build.sh ./build.sh
# Or with Docker Compose # Build minimal embedded initramfs (~50MB)
cd build/ ./build.sh --minimal
docker-compose up
# Build release mode
./build.sh --release
# Clean build without cache
./build.sh --clean
``` ```
### Development Build ### Build Variants
```bash ```bash
cd build/ # Minimal embedded initramfs (~50MB)
# Interactive development shell ./build.sh --minimal
docker-compose run dev-shell
# Build all components (automated) # Full featured initramfs (~700MB)
../scripts/compile-components.sh ./build.sh
# Development with clean rebuild
./build.sh --clean --dev
```
### Development Workflow
```bash
# Start interactive development shell
./build.sh --dev
# Inside container:
/build/scripts/compile-components.sh # Build all components
/build/scripts/build-smart.sh # Smart build with caching
# Build individual components manually: # Build individual components manually:
cd ../components/zinit && cargo build --release --target x86_64-unknown-linux-musl cd /build/components/zinit && cargo build --release --target x86_64-unknown-linux-musl
cd ../components/mycelium && cargo build --release --target x86_64-unknown-linux-musl cd /build/components/mycelium/myceliumd && cargo build --release --target x86_64-unknown-linux-musl
cd ../components/rfs && cargo build --release --target x86_64-unknown-linux-musl cd /build/components/rfs && cargo build --release --target x86_64-unknown-linux-musl
```
### Smart Build (with caching)
```bash
cd build/
docker-compose run builder # Uses build-smart.sh automatically
``` ```
## Key Features ## Key Features
- ✅ **Smart caching** - Only rebuild components that changed
- ✅ **Component workspaces** - Each component maintains its own workspace - ✅ **Component workspaces** - Each component maintains its own workspace
- ✅ **Git subtrees** - Source code included, no submodule complexity - ✅ **Git subtrees** - Source code included, no submodule complexity
- ✅ **Automated build** - `scripts/compile-components.sh` builds all components - ✅ **Source compilation** - All Zero-OS components built from source
- ✅ **Shared target directory** - Efficient build artifact sharing - ✅ **Dual size modes** - Minimal (~50MB) or full (~700MB) initramfs
- ✅ **Smart caching** - Docker layer and volume caching for fast rebuilds - ✅ **Docker layer caching** - Fast rebuilds with persistent cache volumes
- ✅ **Alpine packages** - System tools from Alpine repositories - ✅ **Alpine packages** - Latest system tools from Alpine repositories
- ✅ **Development mode** - Full IDE support and integrated tooling - ✅ **Development mode** - Full IDE support and integrated tooling
- ✅ **Same functionality** - 100% compatible with original Zero-OS
## Build Options
### Package Modes
- **Minimal Mode** (`--minimal`): ~50MB embedded initramfs with essential packages only
- **Full Mode** (default): ~700MB initramfs with complete package set
### Build Modes
- **Debug** (default): Faster compilation with debug symbols
- **Release** (`--release`): Optimized binaries for production
### Cache Control
- **Smart Build** (default): Use cache when possible
- **Clean Build** (`--clean`): Force complete rebuild
## Development ## Development
### Building Individual Components ### Building Individual Components
```bash ```bash
cd build/ # Start development shell
docker-compose run dev-shell ./build.sh --dev
# Inside container - build all components: # Build all components
../scripts/compile-components.sh /build/scripts/compile-components.sh
# Or build specific components manually: # Or build individual components:
cd ../components/zinit && cargo build --release --target x86_64-unknown-linux-musl cd /build/components/zinit
cd ../components/mycelium/myceliumd && cargo build --release --target x86_64-unknown-linux-musl cargo build --release --target x86_64-unknown-linux-musl
cd ../components/rfs && cargo build --release --target x86_64-unknown-linux-musl
```
### Cleanup cd /build/components/mycelium/myceliumd
```bash cargo build --release --target x86_64-unknown-linux-musl
# Clean all build artifacts
./scripts/cleanup.sh cd /build/components/rfs
cargo build --release --target x86_64-unknown-linux-musl
``` ```
### Cache Management ### Cache Management
Smart build uses Docker volumes for caching: Smart build uses Docker volumes for caching:
- `build-cache`: Build state markers - `build-cache`: Build state markers for smart rebuilds
- `source-cache`: Downloaded sources - `source-cache`: Downloaded sources and dependencies
- `kernel-cache`: Kernel builds - `kernel-cache`: Compiled kernel builds
- `target-cache`: Rust workspace build artifacts - `target-cache`: Rust workspace build artifacts
### Updating Components ### Updating Components
@@ -145,3 +167,53 @@ git subtree pull --prefix=components/mycelium https://github.com/threefoldtech/m
# Update rfs to latest # Update rfs to latest
git subtree pull --prefix=components/rfs https://github.com/threefoldtech/rfs.git master --squash git subtree pull --prefix=components/rfs https://github.com/threefoldtech/rfs.git master --squash
``` ```
### Cleanup
```bash
# Clean all build artifacts and cache
./build.sh --clean
# Or clean specific components
./scripts/cleanup.sh
```
## Testing
Test the built kernel:
```bash
# Boot with QEMU
qemu-system-x86_64 \
-kernel output/vmlinuz.efi \
-m 2048 \
-enable-kvm \
-cpu host \
-net nic,model=e1000 \
-net bridge,br=vm0 \
-nographic \
-serial null \
-serial mon:stdio \
-append "console=ttyS1,115200n8"
```
## Architecture Notes
### Single-Stage Boot
This system uses a single-stage initramfs approach where the entire Zero-OS environment is embedded in the kernel. This provides:
- Simpler deployment (single vmlinuz.efi file)
- Faster boot times (no network dependencies)
- Better reliability (no network mount failures)
### Component Compilation
All Zero-OS components (zinit, mycelium, rfs) are compiled from source rather than downloaded as binaries. This ensures:
- Consistent build environment
- Version control over all components
- Easy development and debugging
- Security through reproducible builds
### Smart Caching
The build system tracks file changes and only rebuilds what's necessary:
- Component sources unchanged → use cached binaries
- Kernel config unchanged → use cached kernel
- Only initramfs assembly runs every time (fast)
This typically reduces rebuild time from 10+ minutes to under 2 minutes.

179
scripts/build-boot.sh
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@@ -1,179 +0,0 @@
#!/bin/bash
set -e
BOOT_ROOT="/build/boot"
OUTPUT_DIR="/build/output"
CONFIG_DIR="/build/configs"
echo "[+] Building minimal boot initramfs..."
echo " Target: ~10-20MB embedded in kernel"
echo " Purpose: Boot + network + mount Alpine runtime"
# Clean and create boot root
rm -rf "$BOOT_ROOT"
mkdir -p "$BOOT_ROOT"
echo "[+] Installing minimal boot packages..."
# Set up APK for boot root
mkdir -p "$BOOT_ROOT/etc/apk"
cp /etc/apk/repositories "$BOOT_ROOT/etc/apk/"
# Copy APK keys
if [ -d /etc/apk/keys ]; then
mkdir -p "$BOOT_ROOT/etc/apk/keys"
cp /etc/apk/keys/* "$BOOT_ROOT/etc/apk/keys/"
fi
# Create APK database
mkdir -p "$BOOT_ROOT/lib/apk/db"
mkdir -p "$BOOT_ROOT/var/cache/apk"
# Install absolute minimal packages
echo " Installing boot packages from packages-boot.txt..."
apk --root "$BOOT_ROOT" --clean-protected --update-cache --initdb add alpine-baselayout busybox apk-tools musl
# Install additional boot packages
while read -r package; do
# Skip comments and empty lines
case "$package" in
\#*|"") continue ;;
esac
echo " Installing: $package"
if apk --root "$BOOT_ROOT" add --no-cache "$package"; then
echo " Success: $package"
else
echo " Warning: Failed to install $package"
fi
done < "$CONFIG_DIR/packages-boot.txt"
echo "[+] Installing minimal ethernet drivers..."
# Install essential ethernet firmware and drivers using our minimal script
INITRAMFS_ROOT="$BOOT_ROOT" /build/scripts/install-firmware-minimal.sh
echo "[+] Setting up boot filesystem structure..."
# Create essential directories
mkdir -p "$BOOT_ROOT"/{dev,proc,sys,mnt,tmp,var/run,var/log}
mkdir -p "$BOOT_ROOT"/{root,home,opt}
mkdir -p "$BOOT_ROOT"/mnt/{alpine,debug}
# Create device nodes
echo " Creating device nodes..."
[ ! -e "$BOOT_ROOT/dev/console" ] && mknod "$BOOT_ROOT/dev/console" c 5 1
[ ! -e "$BOOT_ROOT/dev/null" ] && mknod "$BOOT_ROOT/dev/null" c 1 3
[ ! -e "$BOOT_ROOT/dev/zero" ] && mknod "$BOOT_ROOT/dev/zero" c 1 5
# Set proper permissions
chmod 666 "$BOOT_ROOT/dev/null" "$BOOT_ROOT/dev/zero"
chmod 600 "$BOOT_ROOT/dev/console"
echo "[+] Creating boot init script..."
# Create minimal init script for mounting Alpine runtime
cat > "$BOOT_ROOT/init" << 'EOF'
#!/bin/bash
# Minimal boot init - establish network and mount Alpine runtime
echo "[BOOT] Zero-OS minimal boot starting..."
# Mount essential filesystems
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs devtmpfs /dev
# Load essential modules
echo "[BOOT] Loading ethernet drivers..."
modprobe -a e1000 e1000e igb ixgbe r8169 8139too bnx2 tg3 2>/dev/null || true
# Start eudev for hardware detection
echo "[BOOT] Starting hardware detection..."
/sbin/udevd --daemon
udevadm trigger
udevadm settle
# Network configuration
echo "[BOOT] Configuring network..."
for iface in $(ls /sys/class/net/ | grep -v lo); do
echo " Bringing up interface: $iface"
ip link set "$iface" up
# Try DHCP with timeout
timeout 30 dhcpcd "$iface" && break
done
# Mount Alpine runtime system
echo "[BOOT] Mounting Alpine runtime system..."
# Check for VirtioFS mount (development)
if [ -d /sys/fs/virtio_fs ]; then
echo " Attempting VirtioFS mount..."
mount -t virtiofs alpine-root /mnt/alpine && ALPINE_MOUNTED=true
fi
# If VirtioFS failed, try network mount (production)
if [ "$ALPINE_MOUNTED" != "true" ]; then
echo " VirtioFS not available, attempting network mount..."
# Add network mounting logic here (NFS, HTTP, etc.)
echo " Network mount not implemented yet"
fi
# Switch to Alpine runtime if mounted
if [ "$ALPINE_MOUNTED" = "true" ]; then
echo "[BOOT] Switching to Alpine runtime system..."
# Move boot mounts to Alpine
mount --move /proc /mnt/alpine/proc
mount --move /sys /mnt/alpine/sys
mount --move /dev /mnt/alpine/dev
# Switch root to Alpine
exec switch_root /mnt/alpine /sbin/zinit
else
echo "[BOOT] Failed to mount Alpine runtime - dropping to shell"
exec /bin/sh
fi
EOF
chmod +x "$BOOT_ROOT/init"
echo "[+] Setting up symlinks..."
cd "$BOOT_ROOT"
# Standard symlinks
ln -sf usr/lib lib || true
ln -sf usr/lib lib64 || true
# Fixed run symlink (not circular)
mkdir -p run
cd var
ln -sf ../run run || true
cd ..
echo "[+] Cleaning up boot initramfs..."
# Remove unnecessary files
rm -rf var/cache/apk/*
rm -rf usr/share/doc usr/share/man usr/share/info 2>/dev/null || true
# Aggressive cleanup for embedded
find . -name "*.a" -delete 2>/dev/null || true
find . -name "*.la" -delete 2>/dev/null || true
echo "[+] Creating boot initramfs archive..."
cd "$BOOT_ROOT"
# Create cpio archive
find . | cpio -H newc -o > "$OUTPUT_DIR/boot-initramfs.cpio"
if [ -f "$OUTPUT_DIR/boot-initramfs.cpio" ]; then
size=$(stat -c%s "$OUTPUT_DIR/boot-initramfs.cpio")
size_mb=$((size / 1024 / 1024))
echo "[+] Boot initramfs created: $OUTPUT_DIR/boot-initramfs.cpio (${size_mb}MB)"
else
echo "[-] Error: Failed to create boot initramfs"
exit 1
fi
echo "[+] Minimal boot initramfs build complete"
echo " Size: ${size_mb}MB (target: ~10-20MB)"
echo " Contains: Boot + network + minimal drivers"
echo " Purpose: Mount and switch to Alpine runtime"

3
scripts/cleanup.sh
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@@ -176,5 +176,4 @@ echo "[+] Cleanup completed successfully!"
echo "" echo ""
echo "To rebuild the project after cleanup:" echo "To rebuild the project after cleanup:"
echo " 1. Run: ./build.sh # Full rebuild" echo " 1. Run: ./build.sh # Full rebuild"
echo " 2. Or: docker-compose up --build # Docker rebuild" echo " 2. Or: cd build && docker-compose up --build # Docker rebuild"
echo " 3. Or: scripts/setup-submodules.sh # Restore submodules first"

7
scripts/setup-permissions.sh
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@@ -1,7 +0,0 @@
#!/bin/bash
# Ensure all scripts are executable
chmod +x /build/scripts/*.sh
echo "Script permissions updated:"
ls -la /build/scripts/*.sh | grep -E '\.(sh)$'