OpenDOS/build-image.sh at main · BrightCat14/OpenDOS · GitHub

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#!/bin/bash

BUILD_DIR="build"
KERNEL_NAME="DOSKRNL.BIN"
IMG_NAME="opendos.img"
IMG_SIZE_MB=128
MOUNT_POINT="img"
GRUB_CFG="grub.cfg"

RED='\033[31m'
GREEN='\033[32m'
BLUE='\033[34m'
PURPLE='\033[35m'
NC='\033[0m'

create_image() {
    echo -e "${BLUE}=== Creating image with MBR and FAT12 partition ===${NC}"

    # Check if kernel exists
    if [ ! -f "$BUILD_DIR/$KERNEL_NAME" ]; then
        echo -e "${RED}Error: Kernel not found at $BUILD_DIR/$KERNEL_NAME${NC}"
        echo -e "${RED}Please build the kernel first!${NC}"
        exit 1
    fi

    # Remove old image if exists
    if [ -f "$IMG_NAME" ]; then
        echo -n "Removing old image... "
        rm -f "$IMG_NAME"
        echo -e "${GREEN}OK${NC}"
    fi

    # Create mount point
    mkdir -p "$MOUNT_POINT"

    echo -n "Creating empty image file (${IMG_SIZE_MB}MB)... "
    dd if=/dev/zero of="$IMG_NAME" bs=1M count=$IMG_SIZE_MB status=none || { echo -e "${RED}Error!${NC}"; exit 1; }
    echo -e "${GREEN}OK${NC}"

    echo -n "Creating partition table and partition... "
    parted -s "$IMG_NAME" mklabel msdos
    parted -s "$IMG_NAME" mkpart primary 1MiB 100%
    echo "type=1" | sfdisk --part-type "$IMG_NAME" 1
    echo -e "${GREEN}OK${NC}"

    echo -n "Setting up loop device with partitions... "
    LOOP_DEV=$(sudo losetup --show -fP "$IMG_NAME") || { echo -e "${RED}Error!${NC}"; exit 1; }
    echo -e "${GREEN}OK (${LOOP_DEV})${NC}"

    echo -n "Formatting partition as FAT12... "
    sudo mkfs.fat -F 12 "${LOOP_DEV}p1" >/dev/null || { echo -e "${RED}Error!${NC}"; sudo losetup -d $LOOP_DEV; exit 1; }
    echo -e "${GREEN}OK${NC}"

    echo -n "Mounting partition... "
    sudo mount "${LOOP_DEV}p1" "$MOUNT_POINT" || { echo -e "${RED}Error!${NC}"; sudo losetup -d $LOOP_DEV; exit 1; }
    echo -e "${GREEN}OK${NC}"

    echo -n "Creating directories and copying kernel... "
    sudo mkdir -p "$MOUNT_POINT/OPENDOS" "$MOUNT_POINT/boot/grub"
    sudo cp "$BUILD_DIR/$KERNEL_NAME" "$MOUNT_POINT/OPENDOS/$KERNEL_NAME"
    echo -e "${GREEN}OK${NC}"

    echo -n "Creating grub.cfg... "
    sudo tee "$MOUNT_POINT/boot/grub/$GRUB_CFG" >/dev/null << EOF
set timeout=5
set default=0

menuentry "OpenDOS Kernel" {
    multiboot /OPENDOS/$KERNEL_NAME
    boot
}
EOF
    echo -e "${GREEN}OK${NC}"

    echo -n "Installing GRUB in MBR... "
    sudo grub-install --target=i386-pc --boot-directory="$MOUNT_POINT/boot" --modules="multiboot" --recheck --force "$LOOP_DEV" >/dev/null 2>&1 || { echo -e "${RED}Error!${NC}"; sudo umount "$MOUNT_POINT"; sudo losetup -d $LOOP_DEV; exit 1; }
    echo -e "${GREEN}OK${NC}"

    echo -n "Unmounting partition... "
    sudo umount "$MOUNT_POINT" || { echo -e "${RED}Error!${NC}"; sudo losetup -d $LOOP_DEV; exit 1; }
    echo -e "${GREEN}OK${NC}"

    echo -n "Detaching loop device... "
    sudo losetup -d "$LOOP_DEV" || { echo -e "${RED}Error!${NC}"; exit 1; }
    echo -e "${GREEN}OK${NC}"
}

create_image
echo -e "${PURPLE}=== Image $IMG_NAME ready! ===${NC}"