create-image: use mtools to populate image

Use the `mtools` set of utilities to populate the image without the need
to run mount the image (requring sudo).

Author: hexagonal-sun

README.md

@@ -66,10 +66,11 @@ x86) before running on bare metal.
 ## Building and Running
 
 ### Prerequisites
-You will need QEMU for aarch64 emulation and dosfstools to create the virtual file system.
+You will need QEMU for aarch64 emulation, dosfstools and mtools to create the
+virtual file system.
 
 ```bash
-sudo apt install qemu-system-aarch64 dosfstools
+sudo apt install qemu-system-aarch64 dosfstools mtools
 ```
 
 Additionally you will need a version of the [aarch64-none-elf](https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain) toolchain installed.
@@ -100,14 +101,12 @@ into the `build` directory.
 
 Once that is done, you can create the image using the following command:
 ```bash
-sudo ./scripts/create-image.sh
+./scripts/create-image.sh
 ```
 
-This will create an image file named `moss.img` in the root directory of the project,
-format it as VFAT 32 and create the necessary files and directories for the kernel.
-
-This script needs to run with sudo to mount the image through a loop device,
-which is required to properly create the image for the kernel to work.
+This will create an image file named `moss.img` in the root directory of the
+project, format it as VFAT 32 and create the necessary files and directories for
+the kernel.
 
 ### Running via QEMU
 

scripts/create-image.sh

@@ -5,23 +5,13 @@ base="$( cd "$( dirname "${BASH_SOURCE[0]}" )"/.. && pwd )"
 pushd "$base" &>/dev/null || exit 1
 
 img="$base/moss.img"
-mount="$base/build/mount"
-
-mkdir -p "$mount"
 
 dd if=/dev/zero of="$img" bs=1M count=128
 mkfs.vfat -F 32 "$img"
 
-if ! mountpoint -q "$mount"; then
-    mount -o loop "$img" "$mount"
-fi
-
-mkdir -p "$mount/bin"
-mkdir -p "$mount/dev"
+mmd -i "$img" ::/bin
+mmd -i "$img" ::/dev
 
-cp "$base/build/bin"/* "$mount/bin"
+mcopy -i "$img" "$base/build/bin"/* "::/bin"
 
-if mountpoint -q "$mount"; then
-    umount "$mount"
-fi
-popd &>/dev/null || exit 1
+popd &>/dev/null || exit 1