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prefix?=/usr/local

cc_files=wait_for_files samizdat-pinentry
cpp_files=dynmenu

compiled_programs=${cc_files} ${cpp_files}

CC=gcc -std=gnu99
CFLAGS=-Os

SUBMODULES = fsmgr kiki openssh

all: samizdat-paths.sh ${compiled_programs} ${SUBMODULES}

.PHONY: stack
stack:
	which stack >/dev/null || curl -sSL https://get.haskellstack.org/ | sh

build-deps: build-dep-stamp
build-dep-stamp: build-deps.txt
	sudo apt-get install --no-upgrade $$(cat build-deps.txt)
	touch $@

dynmenu: src/dynmenu.cpp | build-deps
	$(CXX) $(CFLAGS) $< -o $@ -lcurses
samizdat-pinentry: src/samizdat-pinentry.c | build-deps
	$(CC) $(CFLAGS)  $< -o $@ -lcurses
wait_for_files: src/wait_for_files.c | build-deps
	$(CC) $(CFLAGS)  $< -o $@

dyndns_realprog = dyndns.ssh-rsa.cryptonomic.net
dyndns_links = dyndns.ssh-dss.cryptonomic.net                                 \
dyndns.ecdsa-sha2-nistp256.cryptonomic.net dyndns.ssh-ed25519.cryptonomic.net
dyndns_progs = $(dyndns_realprog) $(dyndns_links)

$(addprefix src/, $(dyndns_links)):
	ln -s $(dyndns_realprog) $@

src_bin_programs = xorriso-usb.sh btrfs-functions.sh btrfs-receive-root.sh      \
btrfs-send-root.sh var.sh grub-efi.sh keygen.sh initrd.sh qemu.sh               \
dnsmasq-dhcp-script.sh samizdat-password-agent samizdat-gpg-agent publish-ip.sh \
selfstrap samizdat-daily-snapshot-root samizdat-diff-root kiki-export-stdout    \
kiki-import-stdin $(dyndns_progs)

bin_programs=$(addprefix src/, $(src_bin_programs)) samizdat-paths.sh ${cc_files} ${btrfs_utils}

btrfs_utils=$(addprefix src/btrfs-utils/, btarfs btrfs-shrink with-btrfs-seed)

initrd_files:=$(wildcard src/initrd/*) dynmenu samizdat-pinentry wait_for_files
initramfs_conf_files:=$(wildcard initramfs-tools/*)

isolinux_files:=$(wildcard isolinux/*)

clean:
	rm -f samizdat-paths.sh ${compiled_programs}

.PHONY: all clean
samizdat-paths.sh: src/samizdat-paths.in
	@sed -e "s?PREFIX?$(prefix)?g" $< > $@
include samizdat-paths.sh

install-nested-kvm: conf/kvm.conf
	install -m0644 conf/kvm.conf ${instdir}/etc/modprobe.d/
	modprobe -r kvm-intel kvm-amd kvm; modprobe kvm; modprobe kvm-intel; modprobe kvm-amd; true

network_filter := $(shell ./src/generate-network-filter.sh)

conf_files_out = conf/br0 conf/dnsmasq.conf conf/network_if-up.d_samizdat
conf_files_in = $(addsuffix .in, $(conf_files_out))

$(conf_files_out): $(conf_files_in) ./src/generate-network-filter.sh
	sed -e '$(network_filter)' < $@.in > $@

static_conf_files = conf/torrc conf/nbd-server conf/postfix_main.cf

.PHONY: install-configuration install-bootserver start-bootserver
install-bootserver:
	sudo initrd.sh
	sudo -E $(MAKE) instdir=/ real-install-bootserver start-bootserver

start-bootserver:
	ifup --force br0
	service dnsmasq restart
	service nbd-server restart

real-install-bootserver: $(conf_files_out) $(static_conf_files)
ifndef instdir
	$(error "You must specify instdir, for safety.")
else
	install  -p  -m0644  -DT  conf/dnsmasq.conf              ${instdir}/etc/dnsmasq.conf
	install  -p  -m0644  -DT  conf/eth0                      ${instdir}/etc/network/interfaces.d/eth0
	install  -p  -m0644  -DT  conf/br0                       ${instdir}/etc/network/interfaces.d/br0
	install  -p  -m0644  -DT  conf/network_if-up.d_samizdat  ${instdir}/etc/network/if-up.d/samizdat
	install  -p  -m0644  -DT  conf/nbd-server                ${instdir}/etc/nbd-server/conf.d/samizdat.conf
endif

install-configuration: real-install-bootserver $(conf_files_out) $(static_conf_files)
ifndef instdir
	$(error "You must specify instdir, for safety.")
else
	install  -p  -m0644  -DT  conf/postfix_main.cf           ${instdir}/etc/postfix/main.cf
	install  -p  -m0644  -DT  conf/torrc                     ${instdir}/etc/tor/torrc
	ln -sf /var/cache/kiki/config/tor/hostname  ${instdir}/etc/mailname
	ln -sf /var/cache/kiki/config/tor/hostname  ${instdir}/etc/hostname
endif

include user.mk

.PHONY: submodule $(SUBMODULES)
$(SUBMODULES): stack
	[ -e $@/Makefile ] || git submodule update --init
	$(MAKE) -C $@ $(cmd)

install-submodules: cmd=install
install-submodules: $(SUBMODULES)

rootfs = samizdat
export rootfs

.PHONY: rootfs
rootfs:
	[ -e install-submodules-stamp ] || make install-submodules-stamp
	[ -e install-stamp ] || sudo make install-stamp
	$(MAKE) -C rootfs
	sudo mkdir -p /srv/nbd
	sudo ln -sf "$$PWD"/rootfs/$(rootfs).btrfs /srv/nbd/samizdat.btrfs

boot: rootfs
	sudo SLOW_BOOT=y qemu.sh

fastboot: rootfs
	sudo qemu.sh

reuse_child := $(shell 2>/dev/null read child < reused-child && echo --reuse_child=$$child; true)

samizdat.iso:
	sudo initrd.sh
	xorriso-usb.sh $(reuse_child) --bootloader --out samizdat.iso

isotest: install
	sudo initrd.sh
	xorriso-usb.sh $(reuse_child) --bootloader --out samizdat.iso
	USE_ISO=y SLOW_BOOT=y qemu.sh

isotest-nonet: install
	sudo initrd.sh
	xorriso-usb.sh $(reuse_child) --out samizdat-nonet.iso
	USE_ISO=y SLOW_BOOT=y NO_NET=y qemu.sh samizdat-nonet.iso

.PHONY: install
install:
	[ -e install-submodules-stamp ] || make install-submodules-stamp
	sudo make install-stamp

install-submodules-stamp: install-submodules
	touch $@

install-bin-programs: ${bin_programs}
	install -p ${bin_programs} ${instdir}${samizdat_bindir}

CP=cp --preserve=timestamps -r

install-stamp: install-bin-programs samizdat-paths.sh ${compiled_programs}
	mkdir -p ${instdir}${samizdat_initrd_files_dir}
	mkdir -p ${instdir}${samizdat_child_dir}
	mkdir -p ${instdir}${samizdat_grub_efi_dir}
	mkdir -p ${instdir}${samizdat_initramfs_conf_dir}
	mkdir -p ${instdir}${samizdat_isolinux_dir}
	mkdir -p ${instdir}${samizdat_linux_dir}
	$(CP) ${initrd_files} ${instdir}${samizdat_initrd_files_dir}
	$(CP) ${initramfs_conf_files} ${instdir}${samizdat_initramfs_conf_dir}
	$(CP) ${isolinux_files} ${instdir}${samizdat_isolinux_dir}
	touch $@