Yann Autissier
f2bcbc6857
myos export prints every setting the requested stacks declare, in one process: 68 variables in half a second, where asking for them one at a time costs a process each and about ten seconds. The shim reads that once and includes it, so a .mk target sees HOST_FABIO_VERSION and the computed fabio tag without make knowing anything about how they are produced. --make quotes the values so make neither expands a $ nor starts a comment at a #.
75 lines
2.9 KiB
Makefile
75 lines
2.9 KiB
Makefile
##
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# myos, from make.
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#
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# This file gives a project the myos commands as make targets, without the make
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# engine: every target shells out to bin/myos, which is pure POSIX sh. What the
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# project keeps from make is what make is actually good at, and the CLI is not:
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# its own targets, its own dependencies, and the .mk files of its stacks.
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#
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# MYOS ?= /usr/local/lib/myos
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# include $(MYOS)/share/make/shim.mk
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#
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# It lives outside make/ on purpose: the legacy engine includes every .mk of
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# that directory, and would pull this one in too.
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#
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# Then `make up STACK=host` and `myos up host` do the same thing, through the
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# same code. Variables given on the command line are forwarded, so
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# `make up STACK=host DOMAIN=example.org` behaves as expected.
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MYOS ?= $(patsubst %/share/make/shim.mk,%,$(lastword $(MAKEFILE_LIST)))
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MYOS_BIN ?= $(MYOS)/bin/myos
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STACK_DIR_NAME ?= stack
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## every directory myos looks for stacks in, so the .mk of a stack installed
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## system wide brings its targets along too
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STACK_DIR ?= $(subst :, ,$(shell $(MYOS_BIN) env MYOS_PATH --color=never 2>/dev/null | awk '{print $$2}'))
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# variable MYOS_ARGS: variables set on the make command line, forwarded to myos
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MYOS_ARGS ?= $(foreach v,$(MAKEOVERRIDES),$(v))
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.DEFAULT_GOAL := help
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## the stack files may add their own targets: that is what make is kept for
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include $(foreach dir,$(STACK_DIR),$(wildcard $(dir)/*.mk $(dir)/*/*.mk))
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# function make: run a myos command, for the stack .mk files that call it
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define make
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$(MYOS_BIN) $(MYOS_ARGS) $(1)
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endef
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# The settings of the stacks, read once and evaluated here.
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# A stack keeps its settings in hooks that only myos reads; asking for them one
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# at a time costs a process per variable, so they come in a single call.
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MYOS_SETTINGS ?= .myos.settings.mk
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$(MYOS_SETTINGS):
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@$(MYOS_BIN) --color=never $(MYOS_ARGS) export --make > $@ 2>/dev/null || : > $@
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-include $(MYOS_SETTINGS)
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## regenerated on every run, and the catch-all below must not hand this file
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## to myos as if it were a command
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.PHONY: $(MYOS_SETTINGS)
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# function myos-var: the value myos resolves for one variable, when a single
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# lookup is cheaper than the whole set
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myos-var = $(shell $(MYOS_BIN) --color=never $(MYOS_ARGS) env $(1) | awk '{print $$2}')
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# target help: List the myos commands
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.PHONY: help
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help:
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@$(MYOS_BIN) help
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# target myos: Run an arbitrary myos command, as in `make myos ARGS="up host"`
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.PHONY: myos
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myos:
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@$(MYOS_BIN) $(MYOS_ARGS) $(ARGS)
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# make tries to remake every makefile it read, and the catch-all below would
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# hand each of them to myos as a command. An empty rule stops that.
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$(MAKEFILE_LIST): ;
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# target %: Hand anything else to myos
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## a target the project defines itself keeps precedence over this rule
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%: FORCE
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@$(MYOS_BIN) $(MYOS_ARGS) $@ $(ARGS)
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.PHONY: FORCE
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FORCE: ;
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