#!/usr/bin/make -f

-include alpine.conf.mk

BUILD_DATE	:= $(shell date +%y%m%d)
ALPINE_RELEASE	?= $(BUILD_DATE)
ALPINE_NAME	?= alpine-test
ALPINE_ARCH	:= i386
DESTDIR		?= $(shell pwd)/isotmp

SUDO		= sudo

ISO		?= $(ALPINE_NAME)-$(ALPINE_RELEASE)-$(ALPINE_ARCH).iso
ISO_LINK	?= $(ALPINE_NAME).iso
ISO_DIR		:= $(DESTDIR)/isofs
ISO_PKGDIR	:= $(ISO_DIR)/apks

APK_OPTS	:= $(addprefix --repo ,$(APK_REPOS))

find_apk_ver	= $(shell apk search $(APK_OPTS) $(1) | sort | uniq)
find_apk_file	= $(addsuffix .apk,$(call find_apk_ver,$(1)))
find_apk	= $(addprefix $(ISO_PKGDIR)/,$(call find_apk_file,$(1)))

# get apk does not support wildcards
get_apk         = $(addsuffix .apk,$(shell apk fetch --simulate $(APK_OPTS) $(1) 2>&1 | sed 's:^Downloading :$(ISO_PKGDIR)/:'))

KERNEL_FLAVOR	?= grsec
KERNEL_PKGNAME	?= linux-$(KERNEL_FLAVOR)
KERNEL_NAME	:= $(KERNEL_FLAVOR)
KERNEL_APK	:= $(call get_apk,$(KERNEL_PKGNAME))

XTABLES_ADDONS_APK:= $(call get_apk,xtables-addons-$(KERNEL_FLAVOR))
DAHDI_LINUX_APK	:= $(call get_apk,dahdi-linux-$(KERNEL_FLAVOR))
ISCSITARGET_APK	:= $(call get_apk,iscsitarget-$(KERNEL_FLAVOR))
MOD_APKS	:= $(KERNEL_APK) $(XTABLES_ADDONS_APK) $(DAHDI_LINUX_APK) \
		   $(ISCSITARGET_APK)

KERNEL		:= $(word 3,$(subst -, ,$(notdir $(KERNEL_APK))))-$(word 2,$(subst -, ,$(notdir $(KERNEL_APK))))

ALPINEBASELAYOUT_APK := $(call find_apk,alpine-baselayout)
UCLIBC_APK	:= $(call get_apk,uclibc)
BUSYBOX_APK	:= $(call get_apk,busybox)
APK_TOOLS_APK	:= $(call get_apk,apk-tools)
STRACE_APK	:= $(call get_apk,strace)

APKS_FILTER	?= | grep -v -- '-dev$$' | grep -v 'sources'

APKS		?= '*'
APK_FILES	:= $(call find_apk,$(APKS))

all: isofs

help:
	@echo "Alpine ISO builder"
	@echo
	@echo "Type 'make iso' to build $(ISO)"
	@echo
	@echo "I will use the following sources files:"
	@echo " 1. $(notdir $(KERNEL_APK)) (looks like $(KERNEL))"
	@echo " 2. $(notdir $(MOD_APKS))"
	@echo " 3. $(notdir $(ALPINEBASELAYOUT_APK))"
	@echo " 4. $(notdir $(UCLIBC_APK))"
	@echo " 5. $(notdir $(BUSYBOX_APK))"
ifeq ($(APK_BIN),)
	@echo " 6. $(notdir $(APK_TOOLS_APK))"
else
	@echo " 6. $(APK_BIN)"
endif
	@echo
	@echo "ALPINE_NAME:    $(ALPINE_NAME)"
	@echo "ALPINE_RELEASE: $(ALPINE_RELEASE)"
	@echo "KERNEL_FLAVOR:  $(KERNEL_FLAVOR)"
	@echo "KERNEL:         $(KERNEL)"
	@echo

clean:
	rm -rf $(MODLOOP) $(MODLOOP_DIR) $(MODLOOP_DIRSTAMP) \
		$(INITFS) $(INITFS_DIRSTAMP) $(INITFS_DIR) \
		$(ISO_DIR) $(ISO_REPOS_DIRSTAMP)


$(APK_FILES):
	@mkdir -p "$(dir $@)";\
	p="$(notdir $(basename $@))";\
	apk fetch $(APK_REPO) -R -v -o "$(dir $@)" $${p%-[0-9]*}
#	apk fetch $(APK_OPTS) -R -v -o "$(dir $@)" \
#		`apk search -q $(APK_OPTS) $(APKS) | sort | uniq`

#
# Modloop
#
MODLOOP		:= $(ISO_DIR)/boot/$(KERNEL_NAME).cmg
MODLOOP_DIR	:= $(DESTDIR)/modloop
MODLOOP_DIRSTAMP := $(DESTDIR)/stamp.modloop

modloop: $(MODLOOP)

$(MODLOOP_DIRSTAMP): $(MOD_APKS)
	@rm -rf $(MODLOOP_DIR)
	@mkdir -p $(MODLOOP_DIR)/lib/modules/
	@for i in $(MOD_APKS); do \
		echo "==> modloop: prepare modules $$i";\
		tar -C $(MODLOOP_DIR) -xzf "$$i"; \
	done
	@rm -rf $(addprefix $(MODLOOP_DIR)/lib/modules/*/, source build)
	@depmod $(KERNEL) -b $(MODLOOP_DIR)
	@touch $(MODLOOP_DIRSTAMP)

$(MODLOOP): $(MODLOOP_DIRSTAMP)
	@echo "==> modloop: building image $(notdir $(MODLOOP))"
	@mkdir -p $(dir $(MODLOOP))
	@mkcramfs $(MODLOOP_DIR)/lib $(MODLOOP)

#
# Initramfs rules
#

INITFS		:= $(ISO_DIR)/boot/$(KERNEL_NAME).gz

INITFS_DIR	:= $(DESTDIR)/initfs
INITFS_FEATURES	:= ata base bootchart cdrom cramfs ext3 ide floppy raid scsi usb

initfs: $(INITFS)
$(INITFS):	$(shell mkinitfs -F "$(INITFS_FEATURES)" -l $(KERNEL))
	@mkinitfs -F "$(INITFS_FEATURES)" \
		-t $(INITFS_DIR) -o $@ $(KERNEL)

#
# Vserver template rules
#
VSTEMPLATE	:= $(ISO_DIR)/vs-template.tar.bz2
VSTEMPLATE_DIR 	:= $(DESTDIR)/vs-template

vstemplate: $(VSTEMPLATE)
	@echo "==> vstemplate: built $(VSTEMPLATE)"

$(VSTEMPLATE):
	@$(SUDO) rm -rf "$(VSTEMPLATE_DIR)"
	@$(SUDO) mkdir -p "$(VSTEMPLATE_DIR)"
	@$(SUDO) apk add --initdb --root $(VSTEMPLATE_DIR) alpine-baselayout openrc busybox
	@cd $(VSTEMPLATE_DIR) && $(SUDO) tar -jcf $@ *

#
# ISO rules
#

ISOLINUX	:= $(ISO_DIR)/isolinux
ISOLINUX_BIN	:= $(ISOLINUX)/isolinux.bin
ISOLINUX_CFG	:= $(ISOLINUX)/isolinux.cfg
SYSLINUX_CFG	:= $(ISO_DIR)/syslinux.cfg

$(ISOLINUX_BIN):
	@echo "==> iso: install isolinux"
	@mkdir -p $(dir $(ISOLINUX_BIN))
	@if ! apk fetch $(APK_REPO) --stdout syslinux | tar -O -zx usr/share/syslinux/isolinux.bin > $@; then \
		rm -f $@ && exit 1;\
	fi

$(ISOLINUX_CFG):
	@echo "==> iso: configure isolinux"
	@mkdir -p $(dir $(ISOLINUX_BIN))
	@echo "timeout 20" >$(ISOLINUX_CFG)
	@echo "prompt 1" >>$(ISOLINUX_CFG)
	@echo "default $(KERNEL_NAME)" >>$(ISOLINUX_CFG)
	@echo "label $(KERNEL_NAME)" >>$(ISOLINUX_CFG)
	@echo "	kernel /boot/$(KERNEL_NAME)" >>$(ISOLINUX_CFG)
	@echo "	append initrd=/boot/$(KERNEL_NAME).gz alpine_dev=cdrom:iso9660 modules=loop,cramfs,sd-mod,usb-storage,floppy quiet" >>$(ISOLINUX_CFG)

$(SYSLINUX_CFG):
	@echo "==> iso: configure syslinux"
	@echo "timeout 20" >$@
	@echo "prompt 1" >>$@
	@echo "default $(KERNEL_NAME)" >>$@
	@echo "label $(KERNEL_NAME)" >>$@
	@echo "	kernel /boot/$(KERNEL_NAME)" >>$@
	@echo "	append initrd=/boot/$(KERNEL_NAME).gz alpine_dev=usbdisk:vfat modules=loop,cramfs,sd-mod,usb-storage quiet" >>$@

ISO_KERNEL	:= $(ISO_DIR)/boot/$(KERNEL_NAME)
ISO_REPOS_DIRSTAMP := $(DESTDIR)/stamp.isorepos
ISOFS_DIRSTAMP	:= $(DESTDIR)/stamp.isofs

$(ISO_REPOS_DIRSTAMP): $(ISO_PKGDIR)/APK_INDEX.gz
	@touch $@

$(ISO_PKGDIR)/APK_INDEX.gz: $(APK_FILES)
	@echo "==> iso: generating repository index"
	@apk index $(ISO_PKGDIR)/*.apk | gzip > $@

$(ISO_KERNEL): $(KERNEL_APK)
	@echo "==> iso: install kernel $(KERNEL)"
	@mkdir -p $(dir $(ISO_KERNEL))
	@tar -C $(ISO_DIR) -xzf $(KERNEL_APK)
	@rm -f $(ISO_DIR)/.[A-Z]* $(ISO_DIR)/.[a-z]*
	@touch $(ISO_KERNEL)

$(ISOFS_DIRSTAMP): $(MODLOOP) $(INITFS) $(ISOLINUX_CFG) $(ISOLINUX_BIN) $(ISO_KERNEL) $(ISO_REPOS_DIRSTAMP) $(SYSLINUX_CFG)
	@echo "$(ALPINE_NAME)-$(ALPINE_RELEASE) $(BUILD_DATE)" \
		> $(ISO_DIR)/.alpine-release
	@touch $@

$(ISO): $(ISOFS_DIRSTAMP)
	@echo "==> iso: building $(notdir $(ISO))"
	@genisoimage -o $(ISO) -l -J -R \
		-b isolinux/isolinux.bin \
		-c isolinux/boot.cat	\
		-no-emul-boot		\
		-boot-load-size 4	\
		-boot-info-table	\
		-quiet			\
		-follow-links		\
		$(ISO_OPTS)		\
		$(ISO_DIR)
	@ln -fs $@ $(ISO_LINK)

isofs: $(ISOFS_DIRSTAMP)
iso: $(ISO)

#
# SHA1 sum of ISO
#
ISO_SHA1	:= $(ISO).sha1

$(ISO_SHA1):	$(ISO)
	@echo "==> Generating sha1 sum"
	@sha1sum $(ISO) > $@ || rm -f $@

#
# USB image
#
USBIMG 		:= $(ALPINE_NAME)-$(ALPINE_RELEASE)-$(ALPINE_ARCH).img
USBIMG_FREE	?= 8192
USBIMG_SIZE 	= $(shell echo $$(( `du -s $(ISO_DIR) | awk '{print $$1}'` + $(USBIMG_FREE) )) )
MBRPATH 	:= /usr/share/syslinux/mbr.bin

$(USBIMG): $(ISOFS_DIRSTAMP)
	@echo "==> Generating $@"
	@mformat -C -v 'ALPINE' -c 16 -h 64 -n 32 -i $(USBIMG) \
		-t $$(($(USBIMG_SIZE) / 1200)) ::
	@syslinux $(USBIMG)
	@mcopy -i $(USBIMG) $(ISO_DIR)/* $(ISO_DIR)/.[a-z]* ::
	@mcopy -i $(USBIMG) /dev/zero ::/zero 2>/dev/null || true
	@mdel -i $(USBIMG) ::/zero

USBIMG_SHA1	:= $(USBIMG).sha1
$(USBIMG_SHA1):	$(USBIMG)
	@echo "==> Generating sha1 sum"
	@sha1sum $(USBIMG) > $@ || rm -f $@

$(ALPINE_NAME).img:	$(USBIMG)
	@ln -sf $(USBIMG) $@

img:	$(ALPINE_NAME).img

sha1 release: $(ISO_SHA1) $(USBIMG_SHA1)