Auto copy from src/

linux/Makefile

@@ -1,21 +1,21 @@
 CHROOT_CMD := chroot build/rootfs /bin/bash -c
-ITDIR := build/rootfs/etc/initramfs-tools
 
-all: build/rootfs/initrd.img build/rootfs/lib/systemd/system/getty@.service build/rootfs/etc/systemd/logind.conf
+FILES = $(shell find src/ -type f -print | sed -e 's|^src/|build/rootfs/|')
 
-build/rootfs/lib/systemd/system/getty@.service: getty@.service
-	cp getty@.service build/rootfs/lib/systemd/system/getty@.service
+all: $(FILES) build/rootfs/initrd.img
 
-build/rootfs/etc/systemd/logind.conf: logind.conf
-	cp logind.conf build/rootfs/etc/systemd/logind.conf
+clean:
+	rm -r build/rootfs
 
-build/rootfs/initrd.img: build/rootfs initramfs/modules initramfs/download.sh
+build/rootfs/initrd.img: $(FILES) | build/rootfs
+	chmod +x build/rootfs/etc/initramfs-tools/scripts/local-top/download.sh
 	$(CHROOT_CMD) "apt update && apt install -y linux-image-4.19.0-6-amd64"
-	cp initramfs/download.sh $(ITDIR)/scripts/local-top
-	chmod +x $(ITDIR)/scripts/local-top/download.sh
-	cp initramfs/modules $(ITDIR)
 	$(CHROOT_CMD) "update-initramfs -c -kall"
 
+build/rootfs/%: src/% | build/rootfs
+		mkdir -p $(@D)
+		cp $< $@
+
 build/rootfs: build/cache
 	rm -r build/rootfs || true
 	cp -r build/cache build/rootfs
@@ -23,6 +23,3 @@ build/rootfs: build/cache
 build/cache:
 	rm -r build/cache || true
 	debootstrap buster build/cache
-
-clean:
-	rm -r build/rootfs