Extract Docker RUN commands into shell scripts for better maintainability

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

scripts/docker-image-create-uefi.sh

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+#!/bin/bash
+# Create UEFI-bootable SparkOS image with GPT partition table
+
+set -e
+
+mkdir -p /output /mnt/esp /mnt/root
+
+echo "=== Creating UEFI-bootable SparkOS image with GRUB ==="
+
+# Create 1GB disk image (larger for kernel + bootloader)
+dd if=/dev/zero of=/output/sparkos.img bs=1M count=1024
+
+# Create GPT partition table
+echo "Creating GPT partition table..."
+parted -s /output/sparkos.img mklabel gpt
+
+# Create EFI System Partition (ESP) - 200MB, FAT32
+echo "Creating EFI System Partition..."
+parted -s /output/sparkos.img mkpart ESP fat32 1MiB 201MiB
+parted -s /output/sparkos.img set 1 esp on
+
+# Create root partition - remaining space, ext4
+echo "Creating root partition..."
+parted -s /output/sparkos.img mkpart primary ext4 201MiB 100%
+
+# Set up loop device for the image
+LOOP_DEV=$(losetup -f)
+losetup -P $LOOP_DEV /output/sparkos.img
+
+# Wait for partition devices
+sleep 1
+
+# Format partitions
+echo "Formatting EFI System Partition (FAT32)..."
+mkfs.vfat -F 32 -n "SPARKOSEFI" ${LOOP_DEV}p1
+
+echo "Formatting root partition (ext4)..."
+mkfs.ext4 -L "SparkOS" ${LOOP_DEV}p2
+
+# Mount ESP
+echo "Mounting partitions..."
+mount ${LOOP_DEV}p1 /mnt/esp
+mount ${LOOP_DEV}p2 /mnt/root
+
+# Install GRUB to ESP
+echo "Installing GRUB bootloader..."
+mkdir -p /mnt/esp/EFI/BOOT
+
+# Create GRUB EFI binary using grub-mkstandalone
+grub-mkstandalone \
+    --format=x86_64-efi \
+    --output=/mnt/esp/EFI/BOOT/BOOTX64.EFI \
+    --locales="" \
+    --fonts="" \
+    "boot/grub/grub.cfg=/dev/null"
+
+# Find the kernel
+KERNEL_PATH=$(find /kernel/boot -name "vmlinuz-*" | head -1)
+KERNEL_VERSION=$(basename $KERNEL_PATH | sed 's/vmlinuz-//')
+INITRD_PATH=$(find /kernel/boot -name "initrd.img-*" | head -1)
+
+# Copy kernel and initrd to ESP
+echo "Installing kernel..."
+mkdir -p /mnt/esp/boot
+cp $KERNEL_PATH /mnt/esp/boot/vmlinuz
+if [ -f "$INITRD_PATH" ]; then cp $INITRD_PATH /mnt/esp/boot/initrd.img; fi
+
+# Create GRUB configuration
+mkdir -p /mnt/esp/boot/grub
+printf '%s\n' \
+    'set timeout=3' \
+    'set default=0' \
+    '' \
+    'menuentry "SparkOS" {' \
+    '    linux /boot/vmlinuz root=LABEL=SparkOS rw init=/sbin/init console=tty1 quiet' \
+    '}' \
+    > /mnt/esp/boot/grub/grub.cfg
+
+# Set up root filesystem
+echo "Setting up root filesystem..."
+mkdir -p /mnt/root/{bin,sbin,etc,proc,sys,dev,tmp,usr/{bin,sbin,lib,lib64},var/{log,run},root,home/spark,boot}
+
+# Install SparkOS init
+cp /build/init /mnt/root/sbin/init
+chmod 755 /mnt/root/sbin/init
+
+# Install busybox
+echo "Installing busybox..."
+cp /bin/busybox /mnt/root/bin/busybox
+chmod 755 /mnt/root/bin/busybox
+
+# Create busybox symlinks for essential commands
+for cmd in sh ls cat echo mount umount mkdir rm cp mv chmod chown ln ps kill; do
+    ln -sf busybox /mnt/root/bin/$cmd
+done
+
+# Create system configuration files
+echo "sparkos" > /mnt/root/etc/hostname
+echo "127.0.0.1   localhost" > /mnt/root/etc/hosts
+echo "127.0.1.1   sparkos" >> /mnt/root/etc/hosts
+echo "root:x:0:0:root:/root:/bin/sh" > /mnt/root/etc/passwd
+echo "spark:x:1000:1000:SparkOS User:/home/spark:/bin/sh" >> /mnt/root/etc/passwd
+echo "root:x:0:" > /mnt/root/etc/group
+echo "spark:x:1000:" >> /mnt/root/etc/group
+
+# Copy README to root partition
+cp /build/config/image-readme.txt /mnt/root/README.txt
+
+# Sync and unmount
+echo "Finalizing image..."
+sync
+umount /mnt/esp
+umount /mnt/root
+losetup -d $LOOP_DEV
+
+# Compress the image
+echo "Compressing image..."
+gzip -9 /output/sparkos.img
+echo "UEFI-bootable image created: /output/sparkos.img.gz"