export
ifndef NIXOPS_CONFIG_PASS_SUBTREE_PATH
  $(error Please set NIXOPS_CONFIG_PASS_SUBTREE_PATH to the password-store subtree path)
endif

NIXOPS_STATE ?= ./state/eldiron.nixops
NIXOPS_DEPLOYMENT = cef694f3-081d-11e9-b31f-0242ec186adf
nixpkgs ?= https://releases.nixos.org/nixos/19.03/nixos-19.03.173009.2516c454c35/nixexprs.tar.xz
NIX_PATH = nixpkgs=${nixpkgs}:nixpkgsNext=${nixpkgs}:nixpkgsPrevious=${nixpkgs}

NIXOPS := $(shell NIX_PATH=$(NIX_PATH) nix-build --no-out-link -E "with import <nixpkgs> { overlays = builtins.attrValues (import ../overlays); }; nixops")/bin/nixops
NIXOPS_PRIV = ./scripts/with_env $(NIXOPS)

###### Current channel information
nix-info:
	@version=$$(nix eval --raw nixpkgs.lib.version) && \
	  mainversion=$$(echo $$version | cut -d"." -f -2) && \
	  echo "https://releases.nixos.org/nixos/$$mainversion/nixos-$$version/nixexprs.tar.xz" && \
	  nix-instantiate --find-file nixpkgs
.PHONY: nix-info

###### Initial setup
setup:
	./scripts/setup
.PHONY: setup

###### Nixops regular tasks
NIXOPS_ARGS ?=
nixops:
	$(NIXOPS_PRIV) $(NIXOPS_ARGS)

SSH_ARGS ?=
ssh-eldiron:
	$(NIXOPS_PRIV) ssh eldiron -- $(SSH_ARGS)

info:
	$(NIXOPS_PRIV) list
	$(NIXOPS_PRIV) info

debug:
	$(NIXOPS_PRIV) deploy --build-only --show-trace

dry-run:
	$(NIXOPS_PRIV) deploy --dry-run

build:
	$(NIXOPS_PRIV) deploy --build-only

upload:
	$(NIXOPS_PRIV) deploy --copy-only

deploy:
	$(NIXOPS_PRIV) deploy

deploy-reboot:
	$(NIXOPS_PRIV) deploy --force-reboot

reboot:
	$(NIXOPS_PRIV) reboot --include=eldiron
.PHONY: nixops ssh-eldiron info debug dry-run build upload deploy deploy-reboot reboot

###### Cleanup generations and garbage collection
profile := $$($(NIXOPS_PRIV) info | grep "^Nix profile: " | sed -e "s/^Nix profile: //")
GEN ?= "+3"

list-generations:
	nix-env -p $(profile) --list-generations
	$(NIXOPS_PRIV) ssh eldiron -- nix-env -p /nix/var/nix/profiles/system --list-generations
.PHONY: list-generations

delete-generations:
	nix-env -p $(profile) --delete-generations $(GEN)
	$(NIXOPS_PRIV) ssh eldiron -- nix-env -p /nix/var/nix/profiles/system --delete-generations $(GEN)
.PHONY: delete-generations

cleanup: delete-generations
	nix-store --gc
	$(NIXOPS_PRIV) ssh eldiron -- nix-store --gc
.PHONY: cleanup

###### Pull environment and deployment from remote
# Don't include pull_deployment by default as this should happen only rarely
pull: pull_environment;
.PHONY: pull

pull_environment:
ifndef NIXOPS_CONFIG_PASS_SUBTREE_REMOTE
	$(error "Please set NIXOPS_CONFIG_PASS_SUBTREE_REMOTE to the password-store subtree remote name")
endif
	pass git subtree pull --prefix=$(NIXOPS_CONFIG_PASS_SUBTREE_PATH) $(NIXOPS_CONFIG_PASS_SUBTREE_REMOTE) master
.PHONY: pull_environment

pull_deployment:
	@if $(NIXOPS) info -d $(NIXOPS_DEPLOYMENT) 2>/dev/null >/dev/null ; then \
	  echo "This will remove your current deployment file and recreate it!. Continue? [y/N]" && \
	  read y && \
	  [ "$$y" = "y" -o "$$y" = "Y" ] && \
	  $(NIXOPS) delete --force -d $(NIXOPS_DEPLOYMENT); \
	fi
	pass show $(NIXOPS_CONFIG_PASS_SUBTREE_PATH)/Nixops/Deployment | $(NIXOPS) import
	$(NIXOPS) modify -d $(NIXOPS_DEPLOYMENT) "$$(pwd)/default.nix"
.PHONY: pull_deployment

deployment_is_set:
	$(NIXOPS) info -d $(NIXOPS_DEPLOYMENT) 2>/dev/null >/dev/null
.PHONY: deployment_is_set

###### Push environment and deployment information to password store
push: push_deployment push_environment;
.PHONY: push

push_deployment:
	$(NIXOPS) export | pass insert -m $(NIXOPS_CONFIG_PASS_SUBTREE_PATH)/Nixops/Deployment
.PHONY: push_deployment

push_environment:
ifndef NIXOPS_CONFIG_PASS_SUBTREE_REMOTE
	$(error "Please set NIXOPS_CONFIG_PASS_SUBTREE_REMOTE to the password-store subtree remote name")
endif
	pass git subtree push --prefix=$(NIXOPS_CONFIG_PASS_SUBTREE_PATH) $(NIXOPS_CONFIG_PASS_SUBTREE_REMOTE) master
.PHONY: push_environment