Filesystem part 1: FAT32 image bootstrapping

setup.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+
+# A script to create a FAT32 loopback device, place a kernel onto it, and install GRUB.
+# Inspired by JakeSteinburger's SpecOS setup script!
+
+if [ "$EUID" -ne 0 ]; then
+    echo "Please execute this script with root privileges."
+    exit
+fi
+
+if [ -f "blankos-fat.img" ]; then
+    echo "Deleting previous disk image..."
+    rm blankos-fat.img
+fi
+
+if [ -d "/mnt/blankos" ]; then
+    echo "Deleting previous mountpoint..."
+    rm -rf /mnt/blankos
+fi
+
+echo "Creating new mountpoint..."
+mkdir /mnt/blankos
+
+echo "Creating an empty disk image..."
+dd if=/dev/zero of=blankos-fat.img bs=512 count=131072
+
+echo "Appending a parition to disk image..."
+fdisk blankos-fat.img << EOF
+n
+p
+1
+
+
+a
+w
+EOF
+
+echo "Creating loopback devices..."
+losetup -fP blankos-fat.img
+
+# Get first partition loopback
+LOOP_DEVICE=$(losetup -l | grep blankos-fat.img | awk '{print $1}')
+PARTITION="${LOOP_DEVICE}p1"
+
+echo "Creating FAT32 partition..."
+mkfs.vfat -F 32 $PARTITION
+
+echo "Mounting partition..."
+mount $PARTITION /mnt/blankos
+
+echo "Installing GRUB on $LOOP_DEVICE"
+grub-install --root-directory=/mnt/blankos --target=i386-pc --no-floppy --modules="normal part_msdos fat multiboot" $LOOP_DEVICE
+
+echo "Copying kernel file and GRUB configuration file..."
+
+cp kernel.elf /mnt/blankos/boot/
+cp grub.cfg /mnt/blankos/boot/grub/
+
+echo "Appending test files..."
+mkdir /mnt/blankos/hello
+echo "Hello, world from FAT32 text file." > /mnt/blankos/hello/testfile.txt
+
+# cp program.elf /mnt/blankos/programs/
+# In the future, when the OS can load programs and parse ELF
+
+echo "Unmounting partition..."
+umount /mnt/blankos
+
+echo "Freeing loopback devices..."
+losetup -d $LOOP_DEVICE
+
+echo "Fixing disk image permissions..."
+sudo chmod 666 blankos-fat.img
+
+echo "The blankos-fat.img disk image is ready for use with QEMU or real hardware."