debian-bootc-simple/modules/chroot.sh

#!/bin/bash

# Chroot-based OSTree creation module for bootc image creation
# This module implements the debian-ostree-builder approach using chroot

# Common functions are sourced by the main script

# Create chroot environment
create_chroot_environment() {
    log_info "Creating chroot environment..."
    
    # Create chroot directory
    local chroot_dir="$WORK_DIR/chroot"
    mkdir -p "$chroot_dir"
    
    # Install debootstrap if not available
    if ! command -v debootstrap >/dev/null 2>&1; then
        log_info "Installing debootstrap..."
        sudo apt update
        sudo apt install -y debootstrap
    fi
    
    # Create base Debian system
    log_info "Creating base Debian system with debootstrap..."
    sudo debootstrap --arch=amd64 --variant=minbase "$TARGET_DEBIAN_RELEASE" "$chroot_dir" http://deb.debian.org/debian/
    
    # Mount necessary filesystems
    log_info "Mounting necessary filesystems..."
    sudo mount --bind /dev "$chroot_dir/dev"
    sudo mount --bind /proc "$chroot_dir/proc"
    sudo mount --bind /sys "$chroot_dir/sys"
    sudo mount --bind /dev/pts "$chroot_dir/dev/pts"
    
    log_info "Chroot environment created at: $chroot_dir"
}

# Install packages in chroot
install_chroot_packages() {
    log_info "Installing packages in chroot..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Update package lists
    sudo chroot "$chroot_dir" apt update
    
    # Install essential packages
    sudo chroot "$chroot_dir" apt install -y \
        systemd \
        systemd-sysv \
        linux-image-amd64 \
        linux-headers-amd64 \
        grub-pc \
        ostree \
        ostree-boot \
        network-manager \
        openssh-server \
        sudo \
        curl \
        wget \
        vim \
        less \
        man-db
    
    # Clean up package cache
    sudo chroot "$chroot_dir" apt clean
    
    log_info "Package installation completed"
}

# Initialize OSTree repository in chroot
init_ostree_repository() {
    log_info "Initializing OSTree repository in chroot..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Initialize OSTree repository
    sudo chroot "$chroot_dir" ostree init --repo=/ostree/repo --mode=bare-user
    
    # Create stateroot for Debian
    sudo chroot "$chroot_dir" ostree admin init-fs /
    sudo chroot "$chroot_dir" ostree admin stateroot-init debian
    
    log_info "OSTree repository initialized"
}

# Create OSTree commit from chroot
create_ostree_commit() {
    log_info "Creating OSTree commit from chroot..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Commit the current system state
    sudo chroot "$chroot_dir" ostree commit \
        --repo=/ostree/repo \
        --branch=debian/$TARGET_DEBIAN_RELEASE/x86_64 \
        --subject="Debian $TARGET_DEBIAN_RELEASE system" \
        --tree=dir=/
    
    log_info "OSTree commit created"
}

# Deploy OSTree system
deploy_ostree_system() {
    log_info "Deploying OSTree system..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Deploy the commit
    sudo chroot "$chroot_dir" ostree admin deploy \
        --os=debian \
        --karg=console=tty0 \
        --karg=console=ttyS0,115200n8 \
        debian/$TARGET_DEBIAN_RELEASE/x86_64
    
    log_info "OSTree system deployed"
}

# Configure bootloader in chroot
configure_chroot_bootloader() {
    log_info "Configuring bootloader in chroot..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Install GRUB
    sudo chroot "$chroot_dir" grub-install --target=i386-pc /dev/sda
    
    # Generate GRUB configuration
    sudo chroot "$chroot_dir" grub-mkconfig -o /boot/grub/grub.cfg
    
    log_info "Bootloader configured"
}

# Copy chroot filesystem to mounted partition
copy_chroot_filesystem() {
    log_info "Copying chroot filesystem to mounted partition..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Copy the entire chroot filesystem
    sudo cp -r "$chroot_dir"/* "$WORK_DIR/mnt/"
    
    # Create essential symlinks
    sudo ln -sf usr/bin "$WORK_DIR/mnt/bin"
    sudo ln -sf usr/lib "$WORK_DIR/mnt/lib"
    sudo ln -sf usr/sbin "$WORK_DIR/mnt/sbin"
    sudo ln -sf usr/lib64 "$WORK_DIR/mnt/lib64"
    
    log_info "Chroot filesystem copied"
}

# Cleanup chroot environment
cleanup_chroot() {
    log_info "Cleaning up chroot environment..."
    
    local chroot_dir="$WORK_DIR/chroot"
    
    # Unmount filesystems
    sudo umount "$chroot_dir/dev/pts" 2>/dev/null || true
    sudo umount "$chroot_dir/sys" 2>/dev/null || true
    sudo umount "$chroot_dir/proc" 2>/dev/null || true
    sudo umount "$chroot_dir/dev" 2>/dev/null || true
    
    # Remove chroot directory
    sudo rm -rf "$chroot_dir"
    
    log_info "Chroot environment cleaned up"
}

# Show chroot information
show_chroot_info() {
    log_info "Chroot information:"
    
    local chroot_dir="$WORK_DIR/chroot"
    
    if [ -d "$chroot_dir" ]; then
        echo "Chroot directory: $chroot_dir"
        echo "Chroot size: $(du -sh "$chroot_dir" 2>/dev/null || echo 'Unknown')"
        
        if [ -d "$chroot_dir/ostree" ]; then
            echo "OSTree repository: Found"
            echo "OSTree size: $(du -sh "$chroot_dir/ostree" 2>/dev/null || echo 'Unknown')"
        else
            echo "OSTree repository: Not found"
        fi
        
        if [ -d "$chroot_dir/boot" ]; then
            echo "Boot directory: Found"
            echo "Kernel: $(ls "$chroot_dir/boot"/vmlinuz* 2>/dev/null || echo 'Not found')"
        else
            echo "Boot directory: Not found"
        fi
    else
        echo "Chroot directory: Not found"
    fi
}

# Print module usage
print_module_usage() {
    echo "Usage: source modules/chroot.sh"
    echo "This module implements chroot-based OSTree creation."
    echo ""
    echo "Available functions:"
    echo "  create_chroot_environment - Create chroot environment"
    echo "  install_chroot_packages - Install packages in chroot"
    echo "  init_ostree_repository - Initialize OSTree repository"
    echo "  create_ostree_commit - Create OSTree commit"
    echo "  deploy_ostree_system - Deploy OSTree system"
    echo "  configure_chroot_bootloader - Configure bootloader"
    echo "  copy_chroot_filesystem - Copy to mounted partition"
    echo "  cleanup_chroot - Cleanup chroot environment"
    echo "  show_chroot_info - Display chroot information"
    echo ""
    echo "Required variables:"
    echo "  WORK_DIR - Working directory for operations"
}