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119 lines
2.8 KiB
Markdown
119 lines
2.8 KiB
Markdown
# GNU Make
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1. [TL;DR](#tldr)
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1. [Load .env files in the Makefile](#load-env-files-in-the-makefile)
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1. [Further readings](#further-readings)
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1. [Sources](#sources)
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## TL;DR
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```makefile
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# assign default values, but allow override
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# usage: make override_me=new_value target
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override override_me ?= default_value
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# export variables for all programs to see
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# only exported in the commands' sub-shells
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export
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# export specific variables only
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export override_me
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# assign shell command output as values
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command_output = ${shell command with args}
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target_name: target_specific_variable = value
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target_name: dash_instead_of_underscore = ${subst _,-,${override_me}}
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target_name: previous_target required_file.ext
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${info output string}
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echoed_command
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@quiet_command
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${MAKE} next_target
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previous_target:
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@quiet_command
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next_target:
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# load env files
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-include .env
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-include .env.local
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# conditionals
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ifeq "${shell uname}" "Darwin"
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expiration_date = ${shell date -v "+365d" "+%FT%TZ"}
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else ifeq "${shell uname}" "Linux"
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expiration_date = ${shell date -d "+1 year" "+%FT%TZ"}
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endif
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```
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```makefile
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repository_name = $(shell basename $$(git rev-parse --show-toplevel))
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override environment_id ?= dev
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override tf_plan_file ?= ${environment_id}.tfplan
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override tf_vars_file ?= ${environment_id}.tfvars
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-include .env
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export
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pre-flight:
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${info validating terraform's configuration…}
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@terraform fmt -recursive
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@terraform validate
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ifeq "${destroy}" "1"
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tf_destroy_switch = -destroy
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endif
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plan: pre-flight ${tf_vars_file}
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${info planning ${environment_id}'s resources…}
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@terraform plan ${tf_destroy_switch} -var-file='${tf_vars_file}' -input=false -out='${tf_plan_file}'
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apply: plan ${tf_plan_file}
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${info applying ${environment_id}'s plan}
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@terraform apply '${tf_plan_file}'
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```
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## Load .env files in the Makefile
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Use this at top of a Makefile to export all variables in `.env`:
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```makefile
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ifneq (,$(wildcard ./.env))
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include .env
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export
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endif
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```
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`ifneq` + `wildcard` is a typical way to check a file exists.<br/>
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`include .env` imports `.env` into the Makefile variables.<br/>
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`export` without parameters exports all variables set until now.
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## Further readings
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- [Conditional syntax]
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### Sources
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- [Makefile variable initialization and export]
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- [How to load and export variables from an .env file in Makefile?]
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<!--
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References
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-->
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<!-- Upstream -->
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[conditional syntax]: https://www.gnu.org/software/make/manual/html_node/Conditional-Syntax.html
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<!-- Others -->
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[how to load and export variables from an .env file in makefile?]: https://stackoverflow.com/questions/44628206/how-to-load-and-export-variables-from-an-env-file-in-makefile#70663753
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[makefile variable initialization and export]: https://stackoverflow.com/questions/2838715/makefile-variable-initialization-and-export
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