Docker image for terraform-docs

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Available Architectures: amd64, i386, arm64, arm/v7, arm/v6

Tiny Alpine-based multistage-build dockerized version of terraform-docs^[1], which additionally implements terraform-docs-replace allowing you to automatically and safely replace the terraform-docs generated output infile. Furthermore this implementation is also Terraform >= 0.12 ready^[2]. See Generic Usage for more details. The image is built nightly against multiple stable versions and pushed to Dockerhub.

• _{[1] Official project: https://github.com/terraform-docs/terraform-docs}
• _{[2] Based on an awk script by cloudposse/build-harness}

:whale: Available Docker image versions

Rolling releaess

The following Docker image tags are rolling releases and are built and updated every night.

Point in time releases

The following Docker image tags are built once and can be used for reproducible builds. Its version never changes so you will have to update tags in your pipelines from time to time in order to stay up-to-date.

:capital_abcd: Environment variables

The following Docker environment variables are available. These will only need to be used when using terraform-docs-replace or terraform-docs-replace-012.

:open_file_folder: Docker mounts

The working directory inside the Docker container is /data/ and should be mounted locally to where your Terraform module is located.

:computer: Usage

Generic

Usage: cytopia/terraform-docs terraform-docs <ARGS> .
       cytopia/terraform-docs terraform-docs-012 <ARGS> .

       cytopia/terraform-docs terraform-docs-replace <ARGS> <PATH-TO-FILE>
       cytopia/terraform-docs terraform-docs-replace-012 <ARGS> <PATH-TO-FILE>


terraform-docs              Output as expected from terraform-docs
terraform-docs-012          Same as above, but used for Terraform >= 0.12 modules

terraform-docs-replace      Replaces directly inside README.md, if DELIM_START and DELIM_CLOSE are found.
terraform-docs-replace-012  Same as above, but used for Terraform >= 0.12 modules

<ARGS>                      All arguments terraform-docs command can use.
<PATH-TO-FILE>              File in where to auto-replace terraform-docs block.

Output to stdout

Create markdown output and sent to stdout:

# [Terraform < 0.12]
docker run --rm \
  -v $(pwd):/data \
  cytopia/terraform-docs \
  terraform-docs --sort-by-required md .

# [Terraform >= 0.12]
docker run --rm \
  -v $(pwd):/data \
  cytopia/terraform-docs \
  terraform-docs-012 --sort-by-required md .

Store in file

Create README.md with terraform-docs output:

# [Terraform < 0.12]
docker run --rm \
  -v $(pwd):/data \
  cytopia/terraform-docs \
  terraform-docs --sort-by-required md . > README.md

# [Terraform >= 0.12]
docker run --rm \
  -v $(pwd):/data \
  cytopia/terraform-docs \
  terraform-docs-012 --sort-by-required md . > README.md

Replace in README.md

Replace current terraform-docs blocks in README.md with current one in order to automatically keep it up to date. For this to work, the terraform-docs information must be wrapped with the following delimiter by default:

README.md:

<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
## Inputs
...
<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->

# [Terraform < 0.12]
# Path to README.md must be specified as last command.
# Note that the command changes from terraform-docs to terraform-docs-replace
docker run --rm \
  -v $(pwd):/data \
  cytopia/terraform-docs \
  terraform-docs-replace --sort-by-required md README.md

# [Terraform >= 0.12]
# Path to README.md must be specified as last command.
# Note that the command changes from terraform-docs to terraform-docs-replace
docker run --rm \
  -v $(pwd):/data \
  cytopia/terraform-docs \
  terraform-docs-replace-012 --sort-by-required md README.md

Replace in INFO.md with different delimiter

You are able to use different delimiter. Let's imagine the following delimiter:

INFO.md:

<!-- TFDOC_START -->
## Inputs
...
<!-- TFDOC_END -->

# [Terraform < 0.12]
# Path to INFO.md must be specified as last command.
# Note that the command changes from terraform-docs to terraform-docs-replace
docker run --rm \
  -v $(pwd):/data \
  -e DELIM_START='<!-- TFDOC_START -->' \
  -e DELIM_CLOSE='<!-- TFDOC_END -->' \
  cytopia/terraform-docs \
  terraform-docs-replace --sort-by-required md INFO.md

# [Terraform >= 0.12]
# Path to INFO.md must be specified as last command.
# Note that the command changes from terraform-docs to terraform-docs-replace
docker run --rm \
  -v $(pwd):/data \
  -e DELIM_START='<!-- TFDOC_START -->' \
  -e DELIM_CLOSE='<!-- TFDOC_END -->' \
  cytopia/terraform-docs \
  terraform-docs-replace-012 --sort-by-required md INFO.md

Example Makefile

You can add the following Makefile to your project for easy generation of terraform-docs output in a Terraform module. It takes into consideration the Main module, sub-modules and examples.

ifneq (,)
.error This Makefile requires GNU Make.
endif

.PHONY: gen _gen-main _gen-examples _gen-modules _update-tf-docs

CURRENT_DIR     = $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
TF_EXAMPLES     = $(sort $(dir $(wildcard $(CURRENT_DIR)examples/*/)))
TF_MODULES      = $(sort $(dir $(wildcard $(CURRENT_DIR)modules/*/)))
TF_DOCS_VERSION = 0.6.0

# Adjust your delimiter here or overwrite via make arguments
DELIM_START = <!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
DELIM_CLOSE = <!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->

gen: _update-tf-docs
	@echo "################################################################################"
	@echo "# Terraform-docs generate"
	@echo "################################################################################"
	@$(MAKE) --no-print-directory _gen-main
	@$(MAKE) --no-print-directory _gen-examples
	@$(MAKE) --no-print-directory _gen-modules

_gen-main:
	@echo "------------------------------------------------------------"
	@echo "# Main module"
	@echo "------------------------------------------------------------"
	@if docker run --rm \
		-v $(CURRENT_DIR):/data \
		-e DELIM_START='$(DELIM_START)' \
		-e DELIM_CLOSE='$(DELIM_CLOSE)' \
		cytopia/terraform-docs:$(TF_DOCS_VERSION) \
		terraform-docs-replace --sort-by-required md README.md; then \
		echo "OK"; \
	else \
		echo "Failed"; \
		exit 1; \
	fi

_gen-examples:
	@$(foreach example,\
		$(TF_EXAMPLES),\
		DOCKER_PATH="examples/$(notdir $(patsubst %/,%,$(example)))"; \
		echo "------------------------------------------------------------"; \
		echo "# $${DOCKER_PATH}"; \
		echo "------------------------------------------------------------"; \
		if docker run --rm \
			-v $(CURRENT_DIR):/data \
			-e DELIM_START='$(DELIM_START)' \
			-e DELIM_CLOSE='$(DELIM_CLOSE)' \
			cytopia/terraform-docs:$(TF_DOCS_VERSION) \
			terraform-docs-replace --sort-by-required md $${DOCKER_PATH}/README.md; then \
			echo "OK"; \
		else \
			echo "Failed"; \
			exit 1; \
		fi; \
	)

_gen-modules:
	@$(foreach module,\
		$(TF_MODULES),\
		DOCKER_PATH="modules/$(notdir $(patsubst %/,%,$(module)))"; \
		echo "------------------------------------------------------------"; \
		echo "# $${DOCKER_PATH}"; \
		echo "------------------------------------------------------------"; \
		if docker run --rm \
			-v $(CURRENT_DIR):/data \
			-e DELIM_START='$(DELIM_START)' \
			-e DELIM_CLOSE='$(DELIM_CLOSE)' \
			cytopia/terraform-docs:$(TF_DOCS_VERSION) \
			terraform-docs-replace --sort-by-required md $${DOCKER_PATH}/README.md; then \
			echo "OK"; \
		else \
			echo "Failed"; \
			exit 1; \
		fi; \
	)

_update-tf-docs:
	docker pull cytopia/terraform-docs:$(TF_DOCS_VERSION)

Travis CI integration

With the above Makefile in place, you can easily add a Travis CI rule to ensure the terraform-docs output is always up-to-date and will fail otherwise (due to git changes):

---
sudo: required
language: minimal
services:
  - docker
script:
  - make gen
  - git diff --quiet || { echo "Build Changes"; git diff; git status; false; }

:information_source: Example projects

Find below some example projects how this Docker image is used in CI to verify if the README.md has been updated with the latest changes generated from terraform-docs:

• https://github.com/cytopia/terraform-aws-rds/blob/master/Makefile
• https://github.com/Flaconi/terraform-aws-microservice/blob/master/Makefile

Related #awesome-ci projects

Docker images

Save yourself from installing lot's of dependencies and pick a dockerized version of your favourite linter below for reproducible local or remote CI tests:

GitHub	DockerHub	Type	Description
awesome-ci		Basic	Tools for git, file and static source code analysis
file-lint		Basic	Baisc source code analysis
linkcheck		Basic	Search for URLs in files and validate their HTTP status code
ansible		Ansible	Multiple versions and flavours of Ansible
ansible-lint		Ansible	Lint Ansible
gofmt		Go	Format Go source code [1]
goimports		Go	Format Go source code [1]
golint		Go	Lint Go code
eslint		Javascript	Lint Javascript code
jsonlint		JSON	Lint JSON files [1]
kubeval		K8s	Lint Kubernetes files
checkmake		Make	Lint Makefiles
phpcbf		PHP	PHP Code Beautifier and Fixer
phpcs		PHP	PHP Code Sniffer
phplint		PHP	PHP Code Linter [1]
php-cs-fixer		PHP	PHP Coding Standards Fixer
bandit		Python	A security linter from PyCQA
black		Python	The uncompromising Python code formatter
mypy		Python	Static source code analysis
pycodestyle		Python	Python style guide checker
pydocstyle		Python	Python docstyle checker
pylint		Python	Python source code, bug and quality checker
terraform-docs		Terraform	Terraform doc generator (TF 0.12 ready) [1]
terragrunt		Terraform	Terragrunt and Terraform
terragrunt-fmt		Terraform	terraform fmt for Terragrunt files [1]
yamlfmt		Yaml	Format Yaml files [1]
yamllint		Yaml	Lint Yaml files

^[1] Uses a shell wrapper to add enhanced functionality not available by original project.

Makefiles

Visit cytopia/makefiles for dependency-less, seamless project integration and minimum required best-practice code linting for CI. The provided Makefiles will only require GNU Make and Docker itself removing the need to install anything else.

:page_facing_up: License

MIT License

Copyright (c) 2019 cytopia