From eea8da433a73dbfc864d4a1c4594831dbf86e9de Mon Sep 17 00:00:00 2001
From: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
Date: Fri, 13 Nov 2020 20:46:30 -0500
Subject: Makefile: use install, refactor, POSIXify

---
 Makefile | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 9a00775..e56437d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,15 +1,19 @@
-MAKEFLAGS += -r
 CFLAGS += -Wall -Wextra
 null :=
 space := $(null) $(null)
 KERNVER ?= $(lastword $(subst /,$(space),$(wildcard /lib/modules/*/)))
 
+# slightly faster
+MAKEFLAGS += -r
+
+FORCE:
+
 all: initramfs.img
 
 initramfs.img: gen_init_cpio make modules.dep $(shell awk '$$1 == "file" { print $$3 }' cpio_list.txt)
 	KERNVER=$(KERNVER) COMPRESSOR="zstd -19 -c -T0" ./make
 
-%: %.c
+gen_init_cpio: gen_init_cpio.c
 	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $< -o $@
 
 dropbear_ed25519_host_key:
@@ -22,8 +26,7 @@ modules.dep: modules modules.dep.ver /lib/modules/$(KERNVER)/modules.dep
 	awk '!/^#/ { print $$1 }' modules | xargs modinfo -F filename -k $(KERNVER) | sed -e 's:^/lib/modules/$(KERNVER)/:^:' | grep -f - /lib/modules/$(KERNVER)/modules.dep > $@
 
 install: initramfs.img
-	rm -f /boot/initramfs.img.old /boot/initramfs.img.new
-	cp initramfs.img /boot/initramfs.img.new || rm -f /boot/initramfs.img.new
+	install -m644 initramfs.img /boot/initramfs.img.new
 	if [ -e /boot/initramfs.img ]; then mv /boot/initramfs.img /boot/initramfs.img.old; fi
 	mv /boot/initramfs.img.new /boot/initramfs.img
 
@@ -33,4 +36,3 @@ clean:
 -include initramfs.d
 
 .PHONY: all install clean
-FORCE:
-- 
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