VERSION:="3.0"
FULL_VERSION_STRING:="PlanetLab BootCD $(VERSION)"
ROOT_PASSWD:='$1$IdEn2srw$/TfrjZSPUC1xP244YCuIi0'
CDRECORD_FLAGS:="-v -dao -blank=fast"

SYSLINUX:=sources/syslinux-2.11.tar.bz2
CD_IMAGE:=cd.iso
CD_ROOT:=cdroot
CD_PWD:=$(shell pwd)
BOOTCD_YUM_GROUP:=BootCD

INITRD_MOUNT:=rd
CD_ROOT_USR:=usr-cd
INITRD_SIZE:=64
INITRD:=$(CD_ROOT)/$(CD_ROOT_USR)/isolinux/initrd

CONF_FILES_DIR=conf_files

PRE_CONF_FILES=etc/fstab \
                   etc/mtab \
                   etc/rpm/macros

POST_CONF_FILES=etc/inittab \
                etc/init.d/pl_hwinit \
                etc/init.d/pl_sysinit \
                etc/modprobe.conf \
                etc/hosts

# directories in the cd root to move to /usr/relocated to reduce ramdisk size
RELOCATE_DIRS=$(CD_ROOT)/lib/tls \
              $(CD_ROOT)/var/lib/rpm

RELOCATE_DEST_DIR=usr/relocated

CD_PRE_CONF_FILES:=$(patsubst %,$(CD_ROOT)/%,$(PRE_CONF_FILES))
CD_POST_CONF_FILES:=$(patsubst %,$(CD_ROOT)/%,$(POST_CONF_FILES))
CD_RELOCATED_DIRS:=$(patsubst %,$(CD_ROOT)/usr/relocated/%,$(RELOCATE_DIRS))

all: $(CD_IMAGE)


$(CD_IMAGE): $(CD_PRE_CONF_FILES) $(CD_POST_CONF_FILES) $(CD_ROOT)/.built $(CD_ROOT)/.config $(INITRD).gz $(CD_RELOCATED_DIRS)
	@echo "building iso"
	mkisofs -o $(CD_IMAGE) -R -allow-leading-dots -J -r \
            -b isolinux/isolinux.bin -c isolinux/boot.cat \
            -no-emul-boot -boot-load-size 4 -boot-info-table \
	    -V PlanetLab-3-0 $(CD_ROOT)/usr


$(CD_ROOT)/.built: $(PRE_YUM)
	@echo "initialize rpm db"

	mkdir -p $(CD_ROOT)/var/lib/rpm
	rpm --root $(CD_PWD)/$(CD_ROOT) --initdb

	@echo "install boot cd base rpms"
	yum -c yum.conf --installroot=$(CD_PWD)/$(CD_ROOT) \
            -y groupinstall $(BOOTCD_YUM_GROUP)

	touch $(CD_ROOT)/.built

$(CD_RELOCATED_DIRS): $(CD_ROOT)/.built
$(CD_RELOCATED_DIRS): $(CD_ROOT)/$(RELOCATE_DEST_DIR)% : $(CD_ROOT)/%
	@echo "relocate some large directories out of the root system"
	mkdir -p $@
	mv $< $@
	ln -s $@ $<


$(CD_PRE_CONF_FILES): $(CD_ROOT)/% : $(CONF_FILES_DIR)/%
	mkdir -p $(dir $@)
	cp -a $< $@


$(CD_POST_CONF_FILES): $(CD_ROOT)/.built $(CD_ROOT)/etc/pl_pcitable

$(CD_POST_CONF_FILES): $(CD_ROOT)/% : $(CONF_FILES_DIR)/%
	mkdir -p $(dir $@)
	cp -a $< $@


$(CD_ROOT)/usr/isolinux/.built:
	@echo "extracting syslinux, copying isolinux files to cd"

	mkdir -p syslinux
	mkdir -p $(CD_ROOT)/usr/isolinux/

	tar -C syslinux -xjvf $(SYSLINUX)
	find syslinux -name isolinux.bin -exec cp -f {} $(CD_ROOT)/usr/isolinux/ \;

	cp -f $(CONF_FILES_DIR)/usr/isolinux/isolinux.cfg $(CD_ROOT)/usr/isolinux/
	echo "$(FULL_VERSION_STRING)" > $(CD_ROOT)/usr/isolinux/message.txt

	touch $(CD_ROOT)/usr/isolinux/.built


$(CD_ROOT)/etc/pl_pcitable:
	scripts/rewrite-pcitable.py \
	    $(wildcard $(CD_ROOT)/lib/modules/*/modules.pcimap) \
	    $(CD_ROOT)/etc/pl_pcitable


$(INITRD).gz: $(CD_ROOT)/.built
	(cd $(CD_ROOT) && mv usr $(CD_ROOT_USR))
	mkdir $(CD_ROOT)/usr

	dd if=/dev/zero of=$(INITRD) bs=1M count=$(INITRD_SIZE)
	mkfs.ext2 -F -m 0 -i 1024 $(INITRD)

	mkdir -p $(INITRD_MOUNT)
	mount -o loop,rw $(INITRD) $(INITRD_MOUNT)
	(cd $(CD_ROOT) && tar --exclude $(CD_ROOT_USR) -cf initrdcontents.tar *)
	tar -C $(INITRD_MOUNT) -xf $(CD_ROOT)/initrdcontents.tar
	umount $(INITRD_MOUNT)
	rmdir $(INITRD_MOUNT)

	gzip $(INITRD)

	rm -f $(CD_ROOT)/initrdcontents.tar
	rmdir $(CD_ROOT)/usr
	(cd $(CD_ROOT) && mv $(CD_ROOT_USR) usr)


$(CD_ROOT)/.config: $(CD_ROOT)/.built $(CD_ROOT)/usr/isolinux/.built
	@echo "removing unneccessary build files"
	rm -rf $(wildcard $(CD_ROOT)/lib/modules/*/build/)

	@echo "setting up non-ssh authentication"
	mkdir -p $(CD_ROOT)/etc/samba
	chroot $(CD_ROOT) /usr/sbin/authconfig --nostart --kickstart \
            --enablemd5 --enableshadow

	@echo "setting root password"
	sed -i "s#root::#root:$(ROOT_PASSWD):#g" $(CD_ROOT)/etc/shadow

	echo "$(FULL_VERSION_STRING)" > $(CD_ROOT)/usr/isolinux/pl_version
	echo "$(FULL_VERSION_STRING)" > $(CD_ROOT)/pl_version


	echo "moving kernel to isolinux directory"
	mkdir -p $(CD_ROOT)/usr/isolinux/
	mv -f $(wildcard $(CD_ROOT)/boot/vmlinuz-*) $(CD_ROOT)/usr/isolinux/kernel



cdr: $(CD_IMAGE)
	cdrecord $(CDRECORD_FLAGS) -data $(CD_IMAGE)

clean:
	rm -rf $(CD_ROOT)
	rm -f $(CD_IMAGE)


.PHONY: all cdr clean