snippet of packer-centric makefile

Makefile

projs := $(basename $(wildcard *.json))
cmds := validate inspect build fix
aliases := bootstrap rebuild

# Enable packer debug logging
PACKER_LOG := 1
PACKER_LOG_PATH := /tmp/packer-debug
export PACKER_LOG PACKER_LOG_PATH

# call out rules that don't generate output
.PHONY: clean deps \
	$(cmds) $(foreach proj,$(projs), $(addsuffix -$(proj),$(cmds))) \
	all $(projs)

# dep management tasks
clean:
	@rm -rf cookbooks

deps: cookbooks

cookbooks:
	@berks vendor $@

# auto-define global and per-proj rules for packer commands
define packer_cmd_rules
$1: $(addprefix $1-,$(projs))
$(addprefix $1-,$(projs)):
	@packer $1 $$(addsuffix .json,$$(subst $1-,,$$@))
endef

$(foreach cmd,$(cmds), $(eval $(call packer_cmd_rules,$(cmd))))

# auto generate global and per-proj fast-builds
all: $(projs)

$(projs):
	@packer build \
		-var "base_image=nathwill/${@}" \
		$(addsuffix .json, $@)