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