From 502bb4f84a5fafd5ec0a222f7b772ff237f4ba62 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Thu, 17 Jul 2025 21:25:59 +0300
Subject: [PATCH] BuildSystem: Add support for building initrd image

This is nice for testing when there isn't xhci controller available or
my usb stack fails :)
---
 script/image.sh                                     | 12 +++++++++---
 script/install-bootloader.sh                        | 11 ++++++++++-
 toolchain/grub-legacy-initrd.cfg                    |  4 ++++
 toolchain/{grub-legacy-boot.cfg => grub-legacy.cfg} |  0
 toolchain/grub-uefi-initrd.cfg                      | 11 +++++++++++
 5 files changed, 34 insertions(+), 4 deletions(-)
 create mode 100644 toolchain/grub-legacy-initrd.cfg
 rename toolchain/{grub-legacy-boot.cfg => grub-legacy.cfg} (100%)
 create mode 100644 toolchain/grub-uefi-initrd.cfg

diff --git a/script/image.sh b/script/image.sh
index 9a73beb8..c25388f8 100755
--- a/script/image.sh
+++ b/script/image.sh
@@ -33,9 +33,15 @@ if [ ! -b $ROOT_PARTITION ]; then
 fi
 
 if sudo mount $ROOT_PARTITION $MOUNT_DIR; then
-	cd $MOUNT_DIR
-	sudo tar xf $BANAN_SYSROOT_TAR
-	cd
+	if (($BANAN_INITRD)); then
+		sudo mkdir -p $MOUNT_DIR/boot
+		sudo cp $BANAN_BUILD_DIR/kernel/banan-os.kernel $MOUNT_DIR/boot/banan-os.kernel
+		sudo cp $BANAN_SYSROOT_TAR $MOUNT_DIR/boot/banan-os.initrd
+	else
+		cd $MOUNT_DIR
+		sudo tar xf $BANAN_SYSROOT_TAR
+		cd
+	fi
 
 	sudo umount $MOUNT_DIR
 fi
diff --git a/script/install-bootloader.sh b/script/install-bootloader.sh
index af43d95a..358cd9c0 100755
--- a/script/install-bootloader.sh
+++ b/script/install-bootloader.sh
@@ -44,7 +44,11 @@ install_grub_legacy() {
 		--boot-directory="$mount_dir/boot"	\
 		$loop_dev
 	sudo mkdir -p "$mount_dir/boot/grub"
-	sudo cp "$BANAN_BUILD_DIR/grub-legacy-boot.cfg" "$mount_dir/boot/grub/grub.cfg"
+	if (($BANAN_INITRD)); then
+		sudo cp "$BANAN_BUILD_DIR/grub-legacy-initrd.cfg" "$mount_dir/boot/grub/grub.cfg"
+	else
+		sudo cp "$BANAN_BUILD_DIR/grub-legacy.cfg" "$mount_dir/boot/grub/grub.cfg"
+	fi
 	sudo umount "$mount_dir"
 }
 
@@ -62,6 +66,11 @@ install_grub_uefi() {
 }
 
 install_banan_legacy() {
+	if (($BANAN_INITRD)); then
+		echo "banan bootloader does not support initrd" >&2
+		exit 1
+	fi
+
 	root_disk_info=$(fdisk -x "$BANAN_DISK_IMAGE_PATH" | tr -s ' ')
 	root_part_guid=$(echo "$root_disk_info" | grep "^$BANAN_DISK_IMAGE_PATH" | head -2 | tail -1 | cut -d' ' -f6)
 
diff --git a/toolchain/grub-legacy-initrd.cfg b/toolchain/grub-legacy-initrd.cfg
new file mode 100644
index 00000000..6fb95830
--- /dev/null
+++ b/toolchain/grub-legacy-initrd.cfg
@@ -0,0 +1,4 @@
+menuentry "banan-os" {
+	multiboot2 /boot/banan-os.kernel readonly
+	module2 /boot/banan-os.initrd
+}
diff --git a/toolchain/grub-legacy-boot.cfg b/toolchain/grub-legacy.cfg
similarity index 100%
rename from toolchain/grub-legacy-boot.cfg
rename to toolchain/grub-legacy.cfg
diff --git a/toolchain/grub-uefi-initrd.cfg b/toolchain/grub-uefi-initrd.cfg
new file mode 100644
index 00000000..cd838dfb
--- /dev/null
+++ b/toolchain/grub-uefi-initrd.cfg
@@ -0,0 +1,11 @@
+insmod part_gpt
+insmod search_fs_uuid
+
+search --no-floppy --fs-uuid --set=root <ROOT_FS>
+
+insmod all_video
+
+menuentry "banan-os" {
+	multiboot2 /boot/banan-os.kernel readonly
+	module2 /boot/banan-os.initrd
+}