help:
	@echo "Build a minimal Linux system"
	@echo ""
	@echo "all         - create all images"
	@echo "qemu        - create an image for QEMU"
	@echo "vdi         - create an image for VirtualBox"
	@echo "vmdk        - create an image for VMware"
	@echo ""
	@echo "clean - cleanup build artifacts"
	@echo ""
	@echo "run minimal Linux for example with 'qema -hda minilinux.img'"

.PHONY: help run all step1 step2 step3 step4 step5 mount-disk umount-disk mount-root umount-root

all: qemu vdi vmdk zip-vdi zip-vmdk

vdi:
	-rm -f minilinux.vdi
	./vditool DD minilinux.vdi minilinux.img
	./vditool SHRINK minilinux.vdi
	chmod 666 minilinux.vdi
 
vmdk:
	qemu-img convert -f raw minilinux.img -O vmdk minilinux.vmdk
	chmod 666 minilinux.vmdk
	chmod 777 minilinux.vmx

zip-vdi:
	zip -9 -v -u minilinux.zip minilinux.vdi
	mv minilinux.zip minilinux-virtualbox.zip
	
zip-vmdk:
	zip -9 -v -u minilinux minilinux.vmx minilinux.vmdk
	mv minilinux.zip minilinux-vmware.zip
		
qemu: clean step1 step2 step3 step4 step5 umount-root

step1:

step2: disk-image mount-root directory-layout initial-devices

step3: grub grub-loader

#step4: kernel uclibc busybox
step4: kernel busybox gpm

step5: perl

# disk image and directories
	
directory-layout:
	cd target && mkdir bin boot dev etc home lib mnt root sbin tmp usr var proc sys
	cd target/boot && mkdir grub
	cd target/var && mkdir lock log run spool
	cd target/usr && mkdir bin include lib local sbin share src
	cd target/usr/share && mkdir man
	cd target/usr/share/man && mkdir man1 man2 man3 man4 man5 man6 man7 man8 man9 
	cd target/usr && ln -s share/man man
	cd target/etc && mkdir init.d
	cp inittab passwd group nsswitch.conf hosts motd issue target/etc
	cp rcS target/etc/init.d

initial-devices:
	rm -rf target/dev/*
	mknod target/dev/console c 5 1
	mknod target/dev/null c 1 3
	mknod target/dev/zero c 1 5
	mknod target/dev/hda b 3 0
	mknod target/dev/hda1 b 3 1
	mknod target/dev/tty0 c 4 0
	mknod target/dev/tty1 c 4 1
	mknod target/dev/tty2 c 4 2
	mknod target/dev/tty3 c 4 3
	mknod target/dev/tty4 c 4 4
	mknod target/dev/tty5 c 4 5
	mknod target/dev/tty6 c 4 6
	mknod target/dev/ttyS0 c 4 64
	mknod target/dev/psaux c 10 1

disk-image:
	qemu-img create minilinux.img 16065
	chmod 666 minilinux.img
	/sbin/losetup /dev/loop0 minilinux.img
	dd if=/dev/zero of=/dev/loop0 bs=1024 count=2048
	dd if=mbr of=/dev/loop0 bs=512 count=1
	echo ',2,L' | /sbin/sfdisk -H 255 -S 63 -C 2 --no-reread /dev/loop0
	/sbin/losetup -d /dev/loop0
	/sbin/losetup -o 512 /dev/loop0 minilinux.img
	/sbin/mke2fs /dev/loop0
	losetup -d /dev/loop0
	mkdir target

# grub boot loeader

grub:
	tar zxf tarballs/grub-0.97.tar.gz
	mkdir grub-build && cd grub-build && ../grub-0.97/configure --prefix=`pwd`
	cd grub-build && make
	cd grub-build && make install
	cp grub-build/lib/grub/i386-pc/stage1 target/boot/grub
	cp grub-build/lib/grub/i386-pc/stage2 target/boot/grub
	cp menu.lst target/boot/grub

grub-loader:
	-umount target
	-mknod /dev/loop0 b 7 0 
	-mknod /dev/loop1 b 7 0 
	-/sbin/losetup -d /dev/loop0
	-/sbin/losetup -d /dev/loop1
	/sbin/losetup -o 512 /dev/loop1 minilinux.img
	ln -s /dev/loop1 /dev/loop01
	/sbin/losetup /dev/loop0 minilinux.img
	grub-build/sbin/grub --batch --no-floppy --device-map=devices.map < grub.install
	/sbin/losetup -d /dev/loop0
	/sbin/losetup -d /dev/loop1
	rm /dev/loop01
	/sbin/losetup -o 512 /dev/loop0 minilinux.img
	mount /dev/loop0 target

grub-clean:
	-rm -rf grub-build
	-rm -rf grub-0.97

# Linux kernel

kernel:
	-rm -rf linux-2.6.28.8
	tar jxf tarballs/linux-2.6.28.8.tar.bz2
	cp kernel-config linux-2.6.28.8/.config
	cd linux-2.6.28.8 && make bzImage
	cp linux-2.6.28.8/arch/i386/boot/bzImage target/boot/bzImage-2.6.28.8

kernel-clean:
	-rm -rf linux-2.6.28.8

# micro C library

uclibc:
	-rm -rf uClibc-0.9.30.1
	tar jxf tarballs/uClibc-0.9.30.1.tar.bz2
	cp uclibc-config uClibc-0.9.30.1/.config
	cd uClibc-0.9.30.1 && make CROSS=i486-pc-linux-gnu-
	cd uClibc-0.9.30.1 && make install DESTDIR=/tools

uclibc-clean:
	-rm -rf uClibc-0.9.30.1

# busybox

busybox:
	-rm -rf busybox-1.13.3
	tar jxf tarballs/busybox-1.13.3.tar.bz2
	cp busybox-config busybox-1.13.3/.config
	cd busybox-1.13.3 && make
	cd busybox-1.13.3 && make install
	cp /lib/libcrypt.so.1 target/lib
	cp /lib/ld-linux.so.2 target/lib
	cp /lib/libm.so.6 target/lib
	cp /lib/libc.so.6 target/lib
	cp /lib/libdl.so.2 target/lib
	cp /lib/libpthread.so.0 target/lib
	-cp /lib/libpcre.so.0 target/lib
	-cp /usr/lib/libpcre.so.3 target/lib

	
busybox-clean:
	-rm -rf busybox-1.13.3

gpm:
	-rm -rf gpm-1.20.6
	tar jxf tarballs/gpm-1.20.6.tar.bz2
	cd gpm-1.20.6 && ./configure --prefix=/usr --without-curses
	cd gpm-1.20.6 && make LDFLAGS="-lm"
	cd gpm-1.20.6 && cp src/gpm ../target/usr/sbin

gpm-clean:
	-rm -rf gpm-1.20.6

perl:
	-rm -rf perl-5.10.0
	tar zxf tarballs/perl-5.10.0.tar.gz
	cd perl-5.10.0 && make -f Makefile.micro
	cd perl-5.10.0 && cp microperl ../target/usr/bin/perl

perl-clean:
	-rm -rf perl-5.10.0

# helpers

mount-disk:
	/sbin/losetup /dev/loop0 minilinux.img

umount-disk:
	/sbin/losetup -d /dev/loop0

mount-root:
	/sbin/losetup -o 512 /dev/loop0 minilinux.img
	mount /dev/loop0 target

umount-root:
	umount target
	/sbin/losetup -d /dev/loop0

# global clean

clean: grub-clean uclibc-clean kernel-clean busybox-clean gpm-clean perl-clean
	-umount target
	-/sbin/losetup -d /dev/loop0
	-rm minilinux.img
	-rm minilinux.vdi *-vditool-*.log
	-rm minilinux.vmdk minilinux.nvram minilinux.vmem minilinux.vmsd minilinux.vmss vmware*.log minilinux.vmxf minilinux*.zip
	-rm -rf target

# download sources to tarballs

source:
	-test -d tarballs || mkdir tarballs
	-test -r tarballs/busybox-1.13.3.tar.bz2 || \
		wget -O tarballs/busybox-1.13.3.tar.bz2 http://www.busybox.net/downloads/busybox-1.13.3.tar.bz2
	-test -r tarballs/grub-0.97.tar.gz || \
		wget -O tarballs/grub-0.97.tar.gz ftp://alpha.gnu.org/gnu/grub/grub-0.97.tar.gz
	-test -r tarballs/perl-5.10.0.tar.gz || \
		wget -O tarballs/perl-5.10.0.tar.gz http://www.cpan.org/src/perl-5.10.0.tar.gz
	-test -r tarballs/linux-2.6.28.8.tar.bz2 || \
		wget -O tarballs/linux-2.6.28.8.tar.bz2 http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.28.8.tar.bz2
	-test -r tarballs/gpm-1.20.6.tar.bz2 || \
		wget -O tarballs/gpm-1.20.6.tar.bz2 http://unix.schottelius.org/gpm/archives/gpm-1.20.6.tar.bz2
	-test -r tarballs/uClibc-0.9.30.1.tar.bz2 || \
		wget -O tarballs/uClibc-0.9.30.1.tar.bz2 http://www.uclibc.org/downloads/uClibc-0.9.30.1.tar.bz2