stockholm/Makefile

stockholm ?= .

export HOSTNAME ?= $(shell cat /proc/sys/kernel/hostname)

export STOCKHOLM_VERSION ?= $(shell \
	version=git.$$(git describe --always --dirty); \
	case $$version in (*-dirty) version=$$version@$$HOSTNAME; esac; \
	date=$$(date +%y.%m); \
	printf '%s' "$$date.$$version"; \
)

system ?= $(HOSTNAME)
$(if $(system),,$(error unbound variable: system))

nixos-config ?= $(stockholm)/$(LOGNAME)/1systems/$(system)/config.nix
ifneq ($(words $(wildcard $(nixos-config))),1)
$(error bad nixos-config: $(nixos-config))
endif

# target = [target_user@]target_host[:target_port][/target_path]
ifdef target
_target_user != echo $(target) | sed -n 's/@.*//p'
_target_path != echo $(target) | sed -n 's/^[^/]*//p'
_target_port != echo $(target) | sed -En 's|^.*:([^/]*)(/.*)?$$|\1|p'
_target_host != echo $(target) | sed -En 's/^(.*@)?([^:/]*).*/\2/p'
ifneq ($(_target_host),)
$(if $(target_host),$(error cannot define both, target_host and host in target))
target_host ?= $(_target_host)
endif
ifneq ($(_target_user),)
$(if $(target_user),$(error cannot define both, target_user and user in target))
target_user ?= $(_target_user)
endif
ifneq ($(_target_port),)
$(if $(target_port),$(error cannot define both, target_port and port in target))
target_port ?= $(_target_port)
endif
ifneq ($(_target_path),)
$(if $(target_path),$(error cannot define both, target_path and path in target))
target_path ?= $(_target_path)
endif
endif

target_host ?= $(system)
target_user ?= root
target_port ?= 22
target_path ?= /var/src

$(if $(target_host),,$(error unbound variable: target_host))
$(if $(target_user),,$(error unbound variable: target_user))
$(if $(target_port),,$(error unbound variable: target_port))
$(if $(target_path),,$(error unbound variable: target_path))

whatsupnix = \
	if type whatsupnix >/dev/null 2>&1; then \
	  whatsupnix $(1); \
	else \
	  cat; \
	fi

build = \
	nix-build \
		-Q \
		--no-out-link \
		--show-trace \
		-I nixos-config=$(nixos-config) \
		-I stockholm=$(stockholm) \
		-E "with import <stockholm>; $(1)" \
		$(2) \
	|& $(call whatsupnix)

evaluate = \
	nix-instantiate \
		--eval \
		--readonly-mode \
		--show-trace \
		-I nixos-config=$(nixos-config) \
		-I stockholm=$(stockholm) \
		-E "let eval = import <stockholm>; in with eval; $(1)" \
		$(2)

ifeq ($(MAKECMDGOALS),)
$(error No goals specified)
endif

# usage: make deploy system=foo [target=bar]
# usage: make install system=foo target=bar
# usage: make test system=foo target=bar
deploy install test:
ifdef target
	nix-shell --run '$@ --system=$(system) --target=$(target)'
else
	nix-shell --run '$@ --system=$(system)'
endif

# usage: make populate system=foo
populate: populate-target = \
	$(target_user)@$(target_host):$(target_port)$(target_path)
ifeq ($(debug),true)
populate: populate-flags += --debug
endif
ifneq ($(ssh),)
populate: populate-flags += --ssh=$(ssh)
endif
populate:
	nix-shell --run 'get-source $(LOGNAME)/1systems/$(system)/source.nix' \
	populate $(populate-target) $(populate-flags)

# usage: make pkgs.populate
pkgs:;@$(error no package selected)
pkgs.%:;@$(call build,$@)

# usage: make LOGNAME=krebs system=wolf eval.config.krebs.build.host.name
eval eval.:;@$(call evaluate,$${expr-eval})
eval.%:;@$(call evaluate,$@)