# == defs

# -- overwrite these >>
ifeq ($(ROOT_FS_DEVICE),)
ROOT_FS_DEVICE = /dev/hda1
endif

BOOT_FILES = $(wildcard /boot/*$(shell uname -r)*)
# -- overwrite these <<

URL = http://www.kernel.org/pub/linux/utils/boot/syslinux/syslinux-3.11.tar.bz2
DLOAD_DIR = /home/samba/dat/share/exe/linux/syslinux
DLOAD_PKG = $(DLOAD_DIR)/$(notdir $(URL))
BUILD_DIR = cd_root
DIRS = $(DLOAD_DIR) $(BUILD_DIR)
UNPACK_DIR = $(notdir $(shell echo $(DLOAD_PKG) | sed 's/.tar.bz2$$//'))
ISO_IMAGE = image.iso
ISOLINUX_BIN = $(UNPACK_DIR)/isolinux.bin
ISOLINUX_CFG = isolinux.cfg
INITRD = /boot/initrd

CD_FILES = \
	$(BOOT_FILES) \
	$(UNPACK_DIR)/com32/modules/menu.c32 \
	$(INITRD) \
	$(ISOLINUX_BIN) \
	$(ISOLINUX_CFG)
	
KERNELS = $(shell file $(BOOT_FILES) | grep -ie 'linux.*kernel' | sed 's/:.*//')

export ROOT_FS_DEVICE

# == targets

all: $(ISO_IMAGE)
install:
clean:
	rm -rf *.done
	rm -rf $(BUILD_DIR) $(UNPACK_DIR)
	rm -f $(ISO_IMAGE)
	rm -f $(ISOLINUX_CFG)

distclean: clean

# == rules

dirs.done:
	mkdir -p $(DIRS)
	touch $@

$(DLOAD_PKG):
	wget -c $(URL) -P $(DLOAD_DIR)

dload.done: $(DLOAD_PKG)
	touch $@

unpack.done: dload.done
	tar -xjf $(DLOAD_PKG)
	touch $@

copy.done: unpack.done dirs.done $(CD_FILES)
	mkdir -p $(BUILD_DIR)
	for i in $(CD_FILES); do \
		n=`basename $$i | tr [A-Z] [a-z] | sed 's/\.tar\.gz/.tgz/; s/-/_/g; s/\([^.]*\)\.\([^.]*\)$$/\1@\2/; s/\./_/g; s/@/./'` ;\
		echo "copying $$i -> $(BUILD_DIR)/$$n" ;\
		cp $$i $(BUILD_DIR)/$$n ;\
	done
	touch $@

$(ISO_IMAGE): copy.done
	mkisofs -l --iso-level 2 -o $(ISO_IMAGE) \
                -b isolinux.bin -c boot.cat \
                -no-emul-boot -boot-load-size 4 -boot-info-table \
		$(BUILD_DIR)

isolinux.cfg:
	( \
		echo DEFAULT menu.c32 ;\
		echo PROMPT 0 ;\
		for k in $(notdir $(KERNELS)); do \
			l=`echo $$k | sed 's/vmlinuz-//g'` ;\
			echo -e "LABEL $$l\n  KERNEL $$k\n  APPEND initrd=initrd root=$(ROOT_FS_DEVICE)" ;\
		done \
	) > $@