From 32ccb3abd176002669a8f6e9e719b1887b7adf92 Mon Sep 17 00:00:00 2001
From: Jarkko Toivanen <jt@jakest.us>
Date: Fri, 16 Aug 2024 18:22:30 +0300
Subject: [PATCH] Automating image-file creation

---
 Makefile | 29 +++++++++++++++++++++++++----
 grub.cfg |  3 +++
 2 files changed, 28 insertions(+), 4 deletions(-)
 create mode 100644 grub.cfg

diff --git a/Makefile b/Makefile
index 7864526..72c8af7 100644
--- a/Makefile
+++ b/Makefile
@@ -4,13 +4,13 @@ clean:
 
 start32.bin: src/*
 	fasm src/start32.asm start32.bin
-image: start32.bin mount
+image: start32.bin mount grub-cfg roska.img mnt/roska/
 	cp start32.bin mnt/roska/
 	sync
 
 qemu-multiboot: start32.bin
 	qemu-system-i386 -kernel start32.bin -serial stdio
-qemu-image: image
+qemu-image: image roska.img
 	qemu-system-i386 roska.img -serial stdio
 
 mount: roska.img mnt/
@@ -18,8 +18,29 @@ mount: roska.img mnt/
 		sudo mount -o loop,offset=1048576,umask=177,dmask=022,uid=$(shell id -u),gid=$(shell id -g) roska.img mnt/; \
 	fi;
 umount:
-	@sudo umount mnt
+	@if mountpoint -q "mnt/"; then \
+		sudo umount mnt/; \
+	fi;
 mnt/:
-	@mkdir mnt
+	@mkdir -p mnt
+mnt/roska/: mount roska.img
+	@mkdir -p mnt/roska
 build/:
 	@mkdir build
+
+roska.img: mnt/
+	dd if=/dev/zero of=roska.img bs=16M count=1
+	echo 'type=83' | sudo sfdisk roska.img
+	sudo losetup /dev/loop0 roska.img
+	sudo losetup /dev/loop1 roska.img -o1048576
+	sudo mkdosfs -F32 -f 2 /dev/loop1
+	sudo mount /dev/loop1 mnt/
+	sudo grub-install --target=i386-pc --root-directory=mnt --boot-directory=mnt/boot --no-floppy --modules="normal part_msdos multiboot" /dev/loop0
+	sudo umount mnt/
+	sudo losetup -d /dev/loop1
+	sudo losetup -d /dev/loop0
+grub-cfg: grub.cfg mount
+	cp grub.cfg mnt/boot/grub/grub.cfg
+lo-unsetup: umount
+	sudo losetup -d /dev/loop1
+	sudo losetup -d /dev/loop0
diff --git a/grub.cfg b/grub.cfg
new file mode 100644
index 0000000..30eab69
--- /dev/null
+++ b/grub.cfg
@@ -0,0 +1,3 @@
+menuentry "rOSka" {
+   multiboot /roska/start32.bin
+}