Fábio Coutada
5ab1b438b4
- initramfs.img, rootfs.img for AArch64 Linux guest - mkdisk.py for disk image creation - initramfs and rootfs directories
140 lines
4.6 KiB
Makefile
140 lines
4.6 KiB
Makefile
# UniversalisOS Linux Guest Rootfs Generation
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#
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# Targets:
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# make minimal - Build minimal initramfs (init only, ~50KB)
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# make busybox - Build busybox-based initramfs (~1MB)
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# make full - Build full rootfs from yocto/buildroot (~50MB)
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# make disk - Create virtio-blk disk image
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# make all - Build minimal + disk image
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# make clean - Remove all build artifacts
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#
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# Prerequisites:
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# - aarch64-linux-gnu-gcc (cross-compiler)
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# - cpio, gzip (for initramfs)
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# - python3 (for mkdisk.py)
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# Configuration
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CROSS_COMPILE ?= aarch64-linux-gnu-
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CC = $(CROSS_COMPILE)gcc
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STRIP = $(CROSS_COMPILE)strip
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# Directories
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ROOTFS_DIR = $(CURDIR)
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OUTPUT_DIR = $(ROOTFS_DIR)/output
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BUILD_DIR = $(ROOTFS_DIR)/build
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INITRAMFS_DIR = $(BUILD_DIR)/initramfs
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# Output files
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INITRAMFS_IMG = $(OUTPUT_DIR)/initramfs.img
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DISK_IMG = $(OUTPUT_DIR)/rootfs.img
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# Disk image size (256 MiB for full rootfs)
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DISK_SIZE = 268435456
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# Busybox configuration
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BUSYBOX_VERSION = 1.36.1
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BUSYBOX_URL = https://busybox.net/downloads/busybox-$(BUSYBOX_VERSION).tar.bz2
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# ===== Minimal initramfs (init only) =====
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.PHONY: minimal
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minimal: $(INITRAMFS_IMG)
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$(OUTPUT_DIR):
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mkdir -p $(OUTPUT_DIR)
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$(BUILD_DIR):
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mkdir -p $(BUILD_DIR)
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$(INITRAMFS_DIR): $(BUILD_DIR)
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mkdir -p $(INITRAMFS_DIR)/{bin,dev,proc,sys,etc,sbin}
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$(INITRAMFS_DIR)/init: $(INITRAMFS_DIR) $(ROOTFS_DIR)/initramfs/init.c
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$(CC) -static -O2 -o $@ $(ROOTFS_DIR)/initramfs/init.c
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$(STRIP) $@
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$(INITRAMFS_DIR)/etc/init.d/rcS: $(INITRAMFS_DIR)
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mkdir -p $(INITRAMFS_DIR)/etc/init.d
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@echo '#!/bin/sh' > $@
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@echo 'mount -t proc proc /proc' >> $@
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@echo 'mount -t sysfs sysfs /sys' >> $@
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@echo 'mount -t tmpfs tmpfs /dev' >> $@
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@chmod +x $@
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$(INITRAMFS_DIR)/etc/fstab: $(INITRAMFS_DIR)
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@echo '# <filesystem> <mount> <type> <opts> <dump> <pass>' > $@
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@echo 'proc /proc proc defaults 0 0' >> $@
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@echo 'sysfs /sys sysfs defaults 0 0' >> $@
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@echo 'tmpfs /dev tmpfs defaults 0 0' >> $@
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$(INITRAMFS_IMG): $(INITRAMFS_DIR)/init $(INITRAMFS_DIR)/etc/init.d/rcS $(INITRAMFS_DIR)/etc/fstab
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cd $(INITRAMFS_DIR) && find . -print0 | cpio --null -o --format=newc 2>/dev/null | gzip -9 > $@
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@echo "Initramfs: $$(du -h $@ | cut -f1)"
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# ===== Busybox initramfs =====
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.PHONY: busybox
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busybox: $(OUTPUT_DIR)/busybox-initramfs.img
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$(BUILD_DIR)/busybox-$(BUSYBOX_VERSION): $(BUILD_DIR)
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cd $(BUILD_DIR) && curl -L $(BUSYBOX_URL) | tar xj
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cd $(BUILD_DIR)/busybox-$(BUSYBOX_VERSION) && make ARCH=aarch64 CROSS_COMPILE=$(CROSS_COMPILE) defconfig
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cd $(BUILD_DIR)/busybox-$(BUSYBOX_VERSION) && sed -i 's/# CONFIG_STATIC is not set/CONFIG_STATIC=y/' .config
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cd $(BUILD_DIR)/busybox-$(BUSYBOX_VERSION) && make ARCH=aarch64 CROSS_COMPILE=$(CROSS_COMPILE) -j$$(nproc)
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$(BUILD_DIR)/busybox-rootfs: $(BUILD_DIR)/busybox-$(BUSYBOX_VERSION)
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mkdir -p $@/{bin,dev,proc,sys,etc,sbin,tmp,root}
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cp $(BUILD_DIR)/busybox-$(BUSYBOX_VERSION)/busybox $@/bin/busybox
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cd $@/bin && for cmd in sh ls cat echo mount mkdir mknod sleep reboot; do ln -sf busybox $$cmd; done
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cd $@/sbin && ln -sf ../bin/busybox init
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@echo '#!/bin/sh' > $@/etc/init.d/rcS
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@echo 'mount -t proc proc /proc' >> $@/etc/init.d/rcS
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@echo 'mount -t sysfs sysfs /sys' >> $@/etc/init.d/rcS
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@echo 'mount -t tmpfs tmpfs /dev' >> $@/etc/init.d/rcS
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@echo 'mount -t devpts devpts /dev/pts' >> $@/etc/init.d/rcS
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@chmod +x $@/etc/init.d/rcS
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$(OUTPUT_DIR)/busybox-initramfs.img: $(BUILD_DIR)/busybox-rootfs $(OUTPUT_DIR)
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cd $(BUILD_DIR)/busybox-rootfs && find . -print0 | cpio --null -o --format=newc 2>/dev/null | gzip -9 > $@
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@echo "Busybox initramfs: $$(du -h $@ | cut -f1)"
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# ===== Full rootfs (yocto/buildroot placeholder) =====
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.PHONY: full
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full: $(OUTPUT_DIR)/full-rootfs.img
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$(OUTPUT_DIR)/full-rootfs.img: $(OUTPUT_DIR)
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@echo "=== Full rootfs generation ==="
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@echo "This target requires yocto or buildroot to be configured."
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@echo "To use:"
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@echo " 1. Configure yocto/buildroot for aarch64"
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@echo " 2. Build the rootfs"
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@echo " 3. Copy the output to $(OUTPUT_DIR)/full-rootfs/"
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@echo " 4. Run: make disk INPUT=$(OUTPUT_DIR)/full-rootfs/"
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@echo ""
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@echo "For now, using minimal initramfs as fallback."
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$(MAKE) minimal
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cp $(INITRAMFS_IMG) $@
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# ===== Disk image generation =====
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.PHONY: disk
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disk: $(DISK_IMG)
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$(DISK_IMG): $(INITRAMFS_IMG)
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python3 ../mkdisk.py $(INITRAMFS_IMG) $@ --size=$(DISK_SIZE)
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@echo "Disk image: $$(du -h $@ | cut -f1)"
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# ===== All =====
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.PHONY: all
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all: minimal disk
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@echo "=== Build complete ==="
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@echo "Initramfs: $(INITRAMFS_IMG)"
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@echo "Disk image: $(DISK_IMG)"
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# ===== Clean =====
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.PHONY: clean
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clean:
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rm -rf $(BUILD_DIR) $(OUTPUT_DIR)
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