76 lines
1.8 KiB
Bash
Executable File
76 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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# A script to create a FAT32 loopback device, place a kernel onto it, and install GRUB.
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# Inspired by JakeSteinburger's SpecOS setup script!
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if [ "$EUID" -ne 0 ]; then
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echo "Please execute this script with root privileges."
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exit
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fi
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if [ -f "blankos-fat.img" ]; then
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echo "Deleting previous disk image..."
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rm blankos-fat.img
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fi
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if [ -d "/mnt/blankos" ]; then
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echo "Deleting previous mountpoint..."
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rm -rf /mnt/blankos
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fi
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echo "Creating new mountpoint..."
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mkdir /mnt/blankos
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echo "Creating an empty disk image..."
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dd if=/dev/zero of=blankos-fat.img bs=512 count=131072
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echo "Appending a parition to disk image..."
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fdisk blankos-fat.img << EOF
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n
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p
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1
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a
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w
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EOF
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echo "Creating loopback devices..."
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losetup -fP blankos-fat.img
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# Get first partition loopback
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LOOP_DEVICE=$(losetup -l | grep blankos-fat.img | awk '{print $1}')
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PARTITION="${LOOP_DEVICE}p1"
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echo "Creating FAT32 partition..."
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mkfs.vfat -F 32 $PARTITION
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echo "Mounting partition..."
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mount $PARTITION /mnt/blankos
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echo "Installing GRUB on $LOOP_DEVICE"
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grub-install --root-directory=/mnt/blankos --target=i386-pc --no-floppy --modules="normal part_msdos fat multiboot" $LOOP_DEVICE
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echo "Copying kernel file and GRUB configuration file..."
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cp kernel.elf /mnt/blankos/boot/
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cp grub.cfg /mnt/blankos/boot/grub/
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echo "Appending test files..."
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mkdir /mnt/blankos/hello
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echo "Hello, world from FAT32 text file." > /mnt/blankos/hello/testfile.txt
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# cp program.elf /mnt/blankos/programs/
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# In the future, when the OS can load programs and parse ELF
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echo "Unmounting partition..."
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umount /mnt/blankos
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echo "Freeing loopback devices..."
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losetup -d $LOOP_DEVICE
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echo "Fixing disk image permissions..."
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sudo chmod 666 blankos-fat.img
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echo "The blankos-fat.img disk image is ready for use with QEMU or real hardware."
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