/src Makefile-generating-Makefile

Makefile

include meta.mk
include concrete.mk

CODE_TARGETS = postgresql-9.5.3 \
               nginx-1.11.1 \
               node-v6.2.1
$(foreach x,$(CODE_TARGETS),$(eval $(call META_TARGET,build/$x,.build-artefacts/$x,code/$x)))

BASE_PYTHON = 3.6.1
BUILD_FEATURES = dev
INSTALL_FEATURES = dev training
PACKAGES = httpie dnslib curio kitty pygit2 pycparser
DEV_PACKAGES =
$(foreach f,$(BUILD_FEATURES),$(eval $(call META_TARGET,build/Python-$(BASE_PYTHON)-$f,.build-artefacts/Python-$(BASE_PYTHON)-$f,code/Python-$(BASE_PYTHON))))
$(foreach f,$(INSTALL_FEATURES),$(eval $(call META_TARGET,install/python/$(BASE_PYTHON)-$f,.install-artefacts/python/$(BASE_PYTHON)-$f,install/python/$(BASE_PYTHON))))
$(foreach p,$(PACKAGES),$(eval $(call META_TARGET,install/python/$(BASE_PYTHON)+$p,.install-artefacts/python/$(BASE_PYTHON)+$p,install/python/$(BASE_PYTHON))))
$(foreach p,$(DEV_PACKAGES),$(eval $(call META_TARGET,install/python/$(BASE_PYTHON)-dev+$p,.install-artefacts/python/$(BASE_PYTHON)-dev+$p,install/python/$(BASE_PYTHON)-dev)))

# convenience rules
build@build/*:          $(filter build@build/%,$(BUILD_TARGETS))
build@install/*:        $(filter build@install/%,$(BUILD_TARGETS))
build@install/python/*: $(filter build@install/python/%,$(BUILD_TARGETS))

clean@build/*:          $(filter clean@build/%,$(CLEAN_TARGETS))
clean@install/*:        $(filter clean@install/%,$(CLEAN_TARGETS))
clean@install/python/*: $(filter clean@install/python/%,$(CLEAN_TARGETS))

meta.mk

SHELL = /bin/zsh
CONCRETE_MAKEFILE = concrete.mk

define META_TARGET

meta@$(1):
	@echo '$(1): build@$(1)'

meta@list@$(1):
	@echo '$(1)'

meta@build@$(1):
	@echo 'build@$(1): $(2) $(3)'
	@if [[ -n "$(4)" ]]; then echo 'build@$(1): $(4)'; fi

meta@dedup@$(1):
	@echo 'dedup@$(1): $(2) $(3)'

meta@clean@$(1):
	@echo 'clean@$(1):'
	@echo 'clean@$(3): clean@$(1)'

meta@vars@$(1):
	@echo 'TARGETS       += $(1)'
	@echo 'BUILD_TARGETS += build@$(1)'
	@echo 'DEDUP_TARGETS += dedup@$(1)'
	@echo 'CLEAN_TARGETS += clean@$(1)'

meta-all:   meta@$(1)
meta-list:  meta@list@$(1)
meta-build: meta@build@$(1)
meta-dedup: meta@dedup@$(1)
meta-clean: meta@clean@$(1)
meta-vars:  meta@vars@$(1)

endef

.DEFAULT_GOAL = list

meta-extras:

.PHONY: concrete
concrete:
	make -s meta-extras > concrete.mk
	make -s meta-all    >> concrete.mk

.PHONY: list
list: meta-list

.PHONY: meta-all
meta-all: meta-build meta-dedup meta-clean meta-vars
	@echo 'all: $$(TARGETS)'
	@echo 'clean: $$(CLEAN_TARGETS)'
	@echo
	@echo '$$(BUILD_TARGETS):'
	@echo '\t-@src-mount $$(@:build@%=%) $$(wordlist 1,2,$$^) > /dev/null && echo "src-mount $$(@:build@%=%) $$(wordlist 1,2,$$^) > /dev/null" || true'
	@echo
	@echo '$$(DEDUP_TARGETS):'
	@echo '\tdedup $$(@:dedup@%=%) $$^ --run'
	@echo
	@echo '$$(CLEAN_TARGETS):'
	@echo '\t-@fusermount -uz $$(@:clean@%=%) 2> /dev/null && echo "fusermount -uz $$(@:clean@%=%) > /dev/null" || true'
	@echo '\t-@rmdir $$(@:clean@%=%) 2> /dev/null && echo "rmdir $$(@:clean@%=%)" || true'
	@echo
	@echo '# default rule'
	@echo '%::;@:'

src-mount

#!/bin/zsh

active=$1
artefacts=$2
code=$3

mount_opts=${4:-}
if [[ -n $mount_opts ]]; then
    mount_opts="-o $mount_opts"
fi

check_dir="$(readlink -f "$active")"
if [[ -e "$check_dir" && "$(mount | grep "$check_dir")" ]]; then
    echo "$0: $active is already mounted"
    exit 1
fi

mkdir -p "$(readlink -f -- "$active")" "$(readlink -f -- "$artefacts")"
unionfs -o cow $mount_opts "$artefacts=RW:$code=RO" $active