ROOT := $(shell pwd)/linuxroot
CPU := $(shell nproc)
MUSL_VERSION := 1.2.4
NCURSES_VERSION := 6.4
OPENSSL_VERSION := 3.0.12

NCURSES := $(ROOT)/usr/lib/libncursesw.so
MUSL := $(ROOT)/usr/include/stdio.h
OPENSSL := $(ROOT)/usr/lib64/libssl.so
DHCPCD := $(ROOT)/usr/sbin/dhcpcd
BSDTAR := $(ROOT)/usr/bin/bsdtar
ZLIB := $(ROOT)/usr/lib/libz.so
TOYBOX := $(ROOT)/bin/toybox
CDEV := $(ROOT)/sbin/cdev

.PHONY: all clean
all: ./linux.iso

$(ROOT)/sbin/init:
	if [ ! -e svn ]; then mkdir svn ; fi
	if [ ! -e svn/cinit ]; then svn co http://sw.e3t.cc/sw/~nishi/cinit/trunk svn/cinit ; fi
	mkdir -p $(ROOT)/sbin
	cd svn/cinit && make STATIC=YES -j$(CPU) && cp bin/cinit $(ROOT)/sbin/init && cp bin/cshutdown $(ROOT)/sbin/shutdown

$(ROOT)/bin/getty:
	if [ ! -e svn ]; then mkdir svn ; fi
	if [ ! -e svn/cgetty ]; then svn co http://sw.e3t.cc/sw/~nishi/cgetty/trunk svn/cgetty ; fi
	mkdir -p $(ROOT)/bin
	cd svn/cgetty && make STATIC=YES -j$(CPU) && cp bin/cgetty $(ROOT)/bin/getty

$(ROOT)/bin/login:
	if [ ! -e svn ]; then mkdir svn ; fi
	if [ ! -e svn/clogin ]; then svn co http://sw.e3t.cc/sw/~nishi/clogin/trunk svn/clogin ; fi
	mkdir -p $(ROOT)/bin
	cd svn/clogin && make STATIC=YES -j$(CPU) && cp bin/clogin $(ROOT)/bin/login

$(ROOT)/sbin/mount:
	if [ ! -e svn ]; then mkdir svn ; fi
	if [ ! -e svn/cmount ]; then svn co http://sw.e3t.cc/sw/~nishi/cmount/trunk svn/cmount ; fi
	mkdir -p $(ROOT)/sbin
	cd svn/cmount && make STATIC=YES -j$(CPU) && cp bin/cmount $(ROOT)/sbin/mount

$(CDEV):
	if [ ! -e svn ]; then mkdir svn ; fi
	if [ ! -e svn/cdev ]; then svn co http://sw.e3t.cc/sw/~nishi/cdev/trunk svn/cdev ; fi
	mkdir -p $(ROOT)/sbin
	cd svn/cdev && make STATIC=YES -j$(CPU) && cp bin/cdev $(ROOT)/sbin/cdev

$(ROOT)/bin/sh:
	if [ ! -e git ]; then mkdir git ; fi
	if [ ! -e git/oksh ]; then git clone https://github.com/ibara/oksh git/oksh ; fi
	mkdir -p $(ROOT)/bin
	cd git/oksh && ./configure --enable-static --disable-curses && make -j$(CPU) && cp oksh $(ROOT)/bin/sh

$(ROOT)/isolinux/bzImage:
	mkdir -p $(ROOT)/isolinux
	wget -O $@ http://ftp.slackware.com/pub/slackware/slackware64-15.0/kernels/huge.s/bzImage

$(MUSL):
	if [ ! -e "musl.tar.gz" ]; then wget -O musl.tar.gz https://musl.libc.org/releases/musl-$(MUSL_VERSION).tar.gz ; fi
	if [ ! -e "musl-$(MUSL_VERSION)" ]; then tar xvf musl.tar.gz ; fi
	mkdir -p $(ROOT)/usr/include
	cd musl-$(MUSL_VERSION) && ./configure --disable-doc --exec-prefix=$(ROOT)/usr --prefix=$(ROOT)/usr
	cd musl-$(MUSL_VERSION) && make -j$(CPU) && make install

$(NCURSES):	$(MUSL)
	if [ ! -e "ncurses.tar.gz" ]; then wget https://invisible-island.net/archives/ncurses/ncurses-$(NCURSES_VERSION).tar.gz -O ncurses.tar.gz ; fi
	if [ ! -e "ncurses-$(NCURSES_VERSION)" ]; then tar xvf ncurses.tar.gz ; fi
	mkdir -p $(ROOT)/usr/lib
	mkdir -p $(ROOT)/usr/share
	cd ncurses-$(NCURSES_VERSION) && ./configure --enable-termcap --with-shared --enable-widec --prefix=/usr && make -j$(CPU) && make install DESTDIR=$(ROOT)

$(ROOT)/usr/bin/htop:	$(MUSL) $(NCURSES)
	if [ ! -e "htop" ]; then git clone https://github.com/htop-dev/htop ; fi
	cd htop && ./autogen.sh && export CFLAGS="--sysroot=$(ROOT)" && export CXXFLAGS="--sysroot=$(ROOT)" export LDFLAGS="--sysroot=$(ROOT) -L$(ROOT)/usr/lib" && ./configure -exec-prefix=$(ROOT)/usr --prefix=$(ROOT)/usr && make -j$(CPU) && make install

$(DHCPCD): $(MUSL)
	if [ ! -e "dhcpcd" ]; then git clone https://github.com/NetworkConfiguration/dhcpcd ; fi
	cd dhcpcd && export CFLAGS="--sysroot=$(ROOT)" && export CXXFLAGS="--sysroot=$(ROOT)" export LDFLAGS="--sysroot=$(ROOT) -L$(ROOT)/usr/lib" && ./configure --prefix=/usr --exec-prefix=/usr --etcdir=/etc --without-udev
	cd dhcpcd && make -j$(CPU) && make install DESTDIR=$(ROOT)

$(TOYBOX): $(MUSL)
	if [ ! -e "toybox" ]; then git clone https://github.com/landley/toybox ; fi
	cd toybox && cp ../dist/toybox-config .config && LDFLAGS="-static" make toybox CC=clang -j$(CPU) && cp ./toybox $@

$(OPENSSL): $(MUSL)
	if [ ! -e "openssl.tar.gz" ]; then wget https://www.openssl.org/source/openssl-3.0.12.tar.gz -O openssl.tar.gz ; fi
	if [ ! -e "openssl-$(OPENSSL_VERSION)" ]; then tar xvf openssl.tar.gz ; fi
	cd openssl-$(OPENSSL_VERSION) && export CFLAGS="--sysroot=$(ROOT)" && export CXXFLAGS="--sysroot=$(ROOT)" && export LDFLAGS="--sysroot=$(ROOT) -L$(ROOT)/usr/lib" && ./config --prefix=$(ROOT)/usr --openssldir=$(ROOT)/usr && make -j$(CPU) && make install

$(BSDTAR): $(MUSL) $(ZLIB)
	if [ ! -e "libarchive" ]; then git clone https://github.com/libarchive/libarchive ; fi
	cd libarchive && export CFLAGS="--sysroot=$(ROOT)" && export CXXFLAGS="--sysroot=$(ROOT)" && export LDFLAGS="--sysroot=$(ROOT) -L$(ROOT)/usr/lib" && autoreconf -fvi && ./configure --prefix=$(ROOT)/usr --exec-prefix=$(ROOT)/usr && make -j$(CPU) && make install

$(ZLIB): $(MUSL)
	if [ ! -e "zlib" ]; then git clone https://github.com/libarchive/zlib ; fi
	cd zlib && export CFLAGS="--sysroot=$(ROOT)" && export CXXFLAGS="--sysroot=$(ROOT)" && export LDFLAGS="--sysroot=$(ROOT) -L$(ROOT)/usr/lib" && ./configure --prefix=$(ROOT)/usr && make -j$(CPU) && make install

$(ROOT)/bin/nv:
	if [ ! -e "nashville" ]; then svn co http://sw.nishi.boats/sw/~nishi/nashville/trunk nashville ; fi
	cd nashville && make STATIC=YES -j$(CPU) && cp bin/nashville $@

$(ROOT)/usr/include/linux/mman.h:
	wget -O kernel-headers.txz http://ftp.slackware.com/pub/slackware/slackware64-15.0/slackware64/d/kernel-headers-5.15.19-x86-2.txz
	tar xvf kernel-headers.txz -C $(ROOT)
	rm -rf $(ROOT)/usr/include/asm
	cp -rf $(ROOT)/usr/include/asm-x86 $(ROOT)/usr/include/asm

$(ROOT)/efiboot.img:	$(ROOT)/isolinux/bzImage \
			dist/refind.conf
	-rm $@
	fallocate -l 16m $@
	mkfs.msdos $@
	mmd -i $@ ::EFI
	mmd -i $@ ::EFI/BOOT
	mmd -i $@ ::EFI/BOOT/ICONS
	mcopy -i $@ /usr/share/refind/refind_x64.efi ::EFI/BOOT/BOOTX64.EFI
	mcopy -i $@ dist/refind.conf ::EFI/BOOT/
	convert dist/iluzja-alt.png -resize 'x600' -gravity center -extent 800x600 iluzja-600.png
	mcopy -i $@ iluzja-600.png ::/bg.png
	mcopy -i $@ /usr/share/refind/icons/* ::EFI/BOOT/ICONS/
	mcopy -i $@ $(ROOT)/isolinux/bzImage ::/

$(ROOT)/usr/share/zoneinfo:
	if [ ! -e tzdb-2023c.tar.lz ]; then wget https://data.iana.org/time-zones/releases/tzdb-2023c.tar.lz ; fi
	tar xvf tzdb-2023c.tar.lz
	cd tzdb-2023c && make TOPDIR=$(ROOT) LDLIBS=-lintl install

./linux.iso:	dist/isolinux.cfg \
		dist/inittab \
		dist/sysinit \
		dist/issue \
		dist/rc.conf \
		dist/rc.subr \
		dist/rc.proc \
		dist/center.c \
		dist/hostname \
		dist/getty-wrapper \
		$(ROOT)/isolinux/bzImage \
		$(ROOT)/sbin/init \
		$(ROOT)/bin/getty \
		$(ROOT)/sbin/mount \
		$(ROOT)/bin/login \
		$(ROOT)/bin/getty \
		$(ROOT)/bin/sh \
		$(ROOT)/usr/include/linux/mman.h \
		$(NCURSES) \
		$(MUSL) \
		$(OPENSSL) \
		$(DHCPCD) \
		$(BSDTAR) \
		$(ZLIB) \
		$(TOYBOX) \
		$(CDEV) \
		$(ROOT)/usr/bin/htop \
		$(ROOT)/bin/nv \
		$(ROOT)/efiboot.img \
		$(ROOT)/usr/share/zoneinfo
	mkdir -p $(ROOT)/isolinux
	mkdir -p $(ROOT)/etc
	mkdir -p $(ROOT)/dev
	mkdir -p $(ROOT)/root
	mkdir -p $(ROOT)/proc
	mkdir -p $(ROOT)/sys
	mkdir -p $(ROOT)/run
	mkdir -p $(ROOT)/tmp
	mkdir -p $(ROOT)/var
	-useradd -R $(ROOT) -g 0 -u 0 -d /root -s /bin/sh root
	-groupadd -R $(ROOT) -g 0 root
	-echo "root:`mkpasswd root`:0::::::" > $(ROOT)/etc/shadow
	cp /usr/share/syslinux/isolinux.bin $(ROOT)/isolinux/
	cp /usr/share/syslinux/ldlinux.c32 $(ROOT)/isolinux/
	cp /usr/share/syslinux/libutil.c32 $(ROOT)/isolinux/
	cp /usr/share/syslinux/libcom32.c32 $(ROOT)/isolinux/
	cp /usr/share/syslinux/menu.c32 $(ROOT)/isolinux/
	cp /usr/share/syslinux/vesamenu.c32 $(ROOT)/isolinux/
	convert dist/iluzja.png -resize 'x480' -gravity center -extent 640x480 $(ROOT)/isolinux/iluzja-480.png
	cp dist/isolinux.cfg $(ROOT)/isolinux/
	cp dist/inittab $(ROOT)/etc/
	cp dist/sysinit $(ROOT)/etc/
	cp dist/issue $(ROOT)/etc/
	cp dist/hostname $(ROOT)/etc/
	cp dist/rc.proc $(ROOT)/etc/
	chmod +x $(ROOT)/etc/rc.proc
	cp dist/rc.subr $(ROOT)/etc/
	chmod +x $(ROOT)/etc/rc.subr
	cp dist/rc.conf $(ROOT)/etc/
	chmod +x $(ROOT)/etc/rc.conf
	cp dist/getty-wrapper $(ROOT)/bin/
	chmod +x $(ROOT)/bin/getty-wrapper
	mkdir -p $(ROOT)/etc/init.d
	-cp -rf dist/init.d/* $(ROOT)/etc/init.d/
	-mkdir -p $(ROOT)/etc/rcS.d
	-cp -rf dist/rcS.d/* $(ROOT)/etc/rcS.d/
	-mkdir -p $(ROOT)/etc/rc0.d
	-cp -rf dist/rc0.d/* $(ROOT)/etc/rc0.d/
	-mkdir -p $(ROOT)/etc/rc1.d
	-cp -rf dist/rc1.d/* $(ROOT)/etc/rc1.d/
	-mkdir -p $(ROOT)/etc/rc2.d
	-cp -rf dist/rc2.d/* $(ROOT)/etc/rc2.d/
	-mkdir -p $(ROOT)/etc/rc3.d
	-cp -rf dist/rc3.d/* $(ROOT)/etc/rc3.d/
	-mkdir -p $(ROOT)/etc/rc4.d
	-cp -rf dist/rc4.d/* $(ROOT)/etc/rc4.d/
	-mkdir -p $(ROOT)/etc/rc5.d
	-cp -rf dist/rc5.d/* $(ROOT)/etc/rc5.d/
	-mkdir -p $(ROOT)/etc/rc6.d
	-cp -rf dist/rc6.d/* $(ROOT)/etc/rc6.d/
	-chmod +x $(ROOT)/etc/rc?.d/*
	-chmod +x $(ROOT)/etc/init.d/*
	ln -sf /usr/lib $(ROOT)/lib
	ln -sf libc.so $(ROOT)/usr/lib/ld-musl-x86_64.so.1
	ln -sf nv $(ROOT)/bin/cat
	ln -sf toybox $(ROOT)/bin/mkdir
	ln -sf toybox $(ROOT)/bin/rm
	ln -sf busybox $(ROOT)/bin/ip
	ln -sf nv $(ROOT)/bin/chmod
	gcc --sysroot=$(ROOT) -o $(ROOT)/bin/center dist/center.c
	chmod +x $(ROOT)/etc/sysinit
	-rm $@
	xorriso -as mkisofs -o $@ -isohybrid-mbr /usr/share/syslinux/isohdpfx.bin -b isolinux/isolinux.bin -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -eltorito-platform efi -eltorito-boot efiboot.img -no-emul-boot $(ROOT)
	du -h $@

clean:
	rm -rf svn git