Initial commit

2025-10-05 00:39:57 +02:00
commit 67007cb748
6 changed files with 229 additions and 0 deletions
@@ -0,0 +1,76 @@
+IMG_FILE := bootable.img
+IMG_SIZE_MB := 100
+EFI_FILE := bootx64.efi
+MNT_DIR := esp_mnt
+USB_DEV ?= /dev/sdX
+
+.PHONY: all clean flash
+
+# The default target, which is to build the image file.
+all: $(EFI_FILE)
+	@echo "--- Creating blank disk image: $(IMG_FILE) ($(IMG_SIZE_MB)MB)..."
+	dd if=/dev/zero of=$(IMG_FILE) bs=1M count=$(IMG_SIZE_MB) status=none
+
+	sudo -v
+
+	@echo "--- Creating GPT and EFI System Partition..."
+	# Use sgdisk for non-interactive partitioning.
+	# --new=1:0:0 creates partition 1, starting at the first available sector and filling the disk.
+	# --typecode=1:ef00 sets the partition type to 'EFI System'.
+	sudo sgdisk --new=1:0:0 --typecode=1:ef00 $(IMG_FILE)
+
+	@# This block handles setting up, using, and cleaning up a loop device and mount point.
+	@# 'set -e' ensures the script will exit immediately if a command fails.
+	@# The trap command guarantees that we unmount the partition and detach the loop device on exit,
+	@# even if an error occurs.
+	set -e; \
+	LOOP_DEV=$$(sudo losetup --partscan --show --find $(IMG_FILE)); \
+	trap 'echo "--- Cleaning up mount point and loop device..."; sudo umount $(MNT_DIR) 2>/dev/null || true; sudo losetup -d $$LOOP_DEV 2>/dev/null || true; rm -rf $(MNT_DIR);' EXIT; \
+	\
+	echo "--- Using loop device: $$LOOP_DEV"; \
+	echo "--- Formatting EFI partition (FAT32)..."; \
+	sudo mkfs.vfat -F32 $${LOOP_DEV}p1; \
+	\
+	echo "--- Mounting partition..."; \
+	mkdir -p $(MNT_DIR); \
+	sudo mount $${LOOP_DEV}p1 $(MNT_DIR); \
+	\
+	echo "--- Copying EFI executable to EFI/BOOT/BOOTX64.EFI..."; \
+	sudo mkdir -p $(MNT_DIR)/EFI/BOOT; \
+	sudo cp $(EFI_FILE) $(MNT_DIR)/EFI/BOOT/BOOTX64.EFI; \
+	\
+	echo "--- Syncing filesystem..."; \
+	sync;
+
+	@echo "\nSuccess! Bootable image created: $(IMG_FILE)"
+
+$(EFI_FILE):
+	zig build-exe -OReleaseFast -target x86_64-uefi-msvc --name bootx64 main.zig
+
+# Rule to flash the image to a USB device.
+flash: $(IMG_FILE)
+	@if [ "$(USB_DEV)" = "/dev/sdX" ]; then \
+		echo "\nERROR: USB_DEV is not set."; \
+		echo "Please specify the target device, e.g., 'make flash USB_DEV=/dev/sdb'"; \
+		exit 1; \
+	fi
+	@echo "\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+	@echo "!! WARNING: This will ERASE ALL DATA on $(USB_DEV) !!"
+	@echo "!! Verify that this is the correct device before proceeding.   !!"
+	@echo "!! Press Ctrl+C to cancel, or Enter to continue.             !!"
+	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+	@read
+	sudo dd if=$(IMG_FILE) of=$(USB_DEV) bs=4M status=progress conv=fsync
+
+# Rule to clean up all generated files and temporary directories.
+clean:
+	@echo "--- Cleaning up..."
+	@-sudo umount $(MNT_DIR) >/dev/null 2>&1 || true
+	@-rm -rf $(MNT_DIR)
+	@-if losetup -j $(IMG_FILE) > /dev/null 2>&1; then \
+		LOOP_DEV=$$(losetup -j $(IMG_FILE) | cut -d: -f1); \
+		echo "Detaching loop device $$LOOP_DEV..."; \
+		sudo losetup -d $$LOOP_DEV; \
+	fi
+	@-rm -f $(IMG_FILE)
+	@echo "Cleanup complete."