# Simple Makefile to build base VM images using packer and ansible
# TODO
#   * support ssh as user instead of root
#   * testing target
PACKER = packer
ANSIBLE_DIR = ansible-roles

# check which hypervisors are available
ifeq ($(shell which qemu-system-$(shell uname -m | sed 's/i686/i386/') 2>&1 > /dev/null && echo $$?), 0)
    AVAILABLE_BUILDERS += qemu
endif
ifeq ($(shell which virtualbox 2>&1 > /dev/null && echo $$?), 0)
    AVAILABLE_BUILDERS += virtualbox-iso
endif
ifeq ($(shell which vmplayer 2>&1 > /dev/null && echo $$?), 0)
    AVAILABLE_BUILDERS += vmware-iso
endif
ifndef BUILDER
    $(info # BUILDER not set, using default builder: $(DEFAULT_BUILDER))
    $(info # Detected builders: $(AVAILABLE_BUILDERS))
    $(info )
    BUILDER := $(firstword $(AVAILABLE_BUILDERS))
endif

##
#       Templates and flavors detection
##
# The packer templates, detected as *.json (excluding base.json)
TEMPLATES := $(basename $(filter-out base.json,$(wildcard *.json)))
# The provisioning flavors, detected as ansible-roles/setup-<flavor>.yml
FLAVORS := $(patsubst $(ANSIBLE_DIR)/setup-%.yml,%, $(wildcard $(ANSIBLE_DIR)/setup-*.yml))

BASETARGETS := $(foreach template, $(TEMPLATES), $(template)/base)
PROVTARGETS := $(foreach template, $(TEMPLATES), $(foreach flavor, $(FLAVORS), $(template)/$(flavor)))
BOOTTARGETS := $(foreach template, $(TEMPLATES), $(template)/base/boot)
BOOTTARGETS += $(foreach prov, $(PROVTARGETS), $(prov)/boot)

PACKER_OPTS := -var-file=base.json
ifdef DEBUG
    PACKER_OPTS += -debug
    PACKER_OPTS += -var='headless=false'
endif

TIMESTAMP := $(shell date "+%Y-%m-%d_%H-%M-%S")

check_rootpw = $(if $(strip $(ROOTPW)),,$(error No root password is set, set it as ROOTPW in your environment.))


.PHONY: all help clean
all: help

##
#       Creating base images
##
$(BASETARGETS):
	$(call check_rootpw)
	$(info ** Building template '$(@D)' using '$(BUILDER)' **)
	$(PACKER) build -only=$(BUILDER) \
		$(PACKER_OPTS) \
		-var='vm_name=rootfs-image' \
		-var='output_directory=$(@D)/base' \
		$(@D).json

##
#       Provisioning images
##
# This should still only use base images
$(PROVTARGETS):
$(foreach flav, $(FLAVORS), %/$(flav)): %/base
	$(call check_rootpw)
	$(eval BUILD_DIR := $(@D)/$(@F).$(TIMESTAMP))
	$(info ** Provisioning '$(@D)' with '$(@F)' **)
	@mkdir -p $(BUILD_DIR)
	@cp -r $(ANSIBLE_DIR) $(BUILD_DIR)/$(ANSIBLE_DIR)
	$(PACKER) build -only=$(BUILDER) \
		$(PACKER_OPTS) \
		-var='vm_name=rootfs-image' \
		-var='output_directory=$(BUILD_DIR)/build' \
		-var='base_image=$(@D)/base/rootfs-image' \
		-var='playbook=setup-$(@F).yml' \
		$(BUILD_DIR)/$(ANSIBLE_DIR)/run-playbook-only.json

##
#		Generating boot files
##
# This should use provisioned image
$(BOOTTARGETS):
%/boot: %
	$(call check_rootpw)
	$(eval BUILD_DIR := $(@D).$(TIMESTAMP))
	$(info ** Generating boot files for '$(BUILD_DIR)')
	$(PACKER) build -only=$(BUILDER) \
		$(PACKER_OPTS) \
		-var='vm_name=rootfs-image.tmp' \
		-var='output_directory=$(BUILD_DIR)/build/tmp' \
		-var='base_image=$(BUILD_DIR)/build/rootfs-image' \
		-var='playbook=build-dracut-initramfs.yml' \
		$(BUILD_DIR)/$(ANSIBLE_DIR)/run-playbook-only.json
	@mv $(BUILD_DIR)/$(ANSIBLE_DIR)/boot_files $(BUILD_DIR)/build/boot

help:
	@printf "Usage:\n\tmake <template>/<flavor>[/boot]\n"
	@echo
	@echo "Base images targets:"
	@for T in $(BASETARGETS); do printf "\t%s\n" "$$T"; done
	@echo
	@echo "Provisioning images targets: "
	@for P in $(PROVTARGETS); do printf "\t%s\n" "$$P"; done
	@echo
	@echo "Generate boot files targets:"
	@printf "\t<provisioning_target>/boot\n"

# The builds are directories named after the template name
clean:
	-$(foreach build_dir,$(TEMPLATES),test -d $(build_dir) && rm -rf $(build_dir);)