pre-commit-opentofu/README.md

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# Collection of git hooks for Terraform to be used with [pre-commit framework](http://pre-commit.com/)
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[![Github tag](https://img.shields.io/github/tag/antonbabenko/pre-commit-terraform.svg)](https://github.com/antonbabenko/pre-commit-terraform/releases) ![maintenance status](https://img.shields.io/maintenance/yes/2021.svg) [![Help Contribute to Open Source](https://www.codetriage.com/antonbabenko/pre-commit-terraform/badges/users.svg)](https://www.codetriage.com/antonbabenko/pre-commit-terraform)
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Want to contribute? Check [open issues](https://github.com/antonbabenko/pre-commit-terraform/issues?q=label%3A%22good+first+issue%22+is%3Aopen+sort%3Aupdated-desc) and [contributing notes](/.github/CONTRIBUTING.md).
## Sponsors
<br />
<a href="https://www.env0.com/?utm_campaign=pre-commit-terraform&utm_source=sponsorship&utm_medium=social"><img src="https://raw.githubusercontent.com/antonbabenko/pre-commit-terraform/master/assets/env0.png" alt="env0" width="180" height="44" />
Automated provisioning of Terraform workflows and Infrastructure as Code.</a>
<br />
<a href="https://www.infracost.io/?utm_campaign=pre-commit-terraform&utm_source=sponsorship&utm_medium=social"><img src="https://raw.githubusercontent.com/antonbabenko/pre-commit-terraform/master/assets/infracost.png" alt="infracost" width="200" height="38" />
Cloud cost estimates for Terraform.</a>
If you are using `pre-commit-terraform` already or want to support its development and [many other open-source projects](https://github.com/antonbabenko/terraform-aws-devops), please become a [GitHub Sponsor](https://github.com/sponsors/antonbabenko)!
## Table of content
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* [How to install](#how-to-install)
* [1. Install dependencies](#1-install-dependencies)
* [2. Install the pre-commit hook globally](#2-install-the-pre-commit-hook-globally)
* [3. Add configs and hooks](#3-add-configs-and-hooks)
* [4. Run](#4-run)
* [Available Hooks](#available-hooks)
* [Hooks usage notes and examples](#hooks-usage-notes-and-examples)
* [checkov](#checkov)
* [infracost_breakdown](#infracost_breakdown)
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* [terraform_docs](#terraform_docs)
* [terraform_docs_replace](#terraform_docs_replace)
* [terraform_fmt](#terraform_fmt)
* [terraform_providers_lock](#terraform_providers_lock)
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* [terraform_tflint](#terraform_tflint)
* [terraform_tfsec](#terraform_tfsec)
* [terraform_validate](#terraform_validate)
* [Authors](#authors)
* [License](#license)
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## How to install
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### 1. Install dependencies
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<!-- markdownlint-disable no-inline-html -->
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* [`pre-commit`](https://pre-commit.com/#install)
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* [`checkov`](https://github.com/bridgecrewio/checkov) required for `checkov` hook.
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* [`terraform-docs`](https://github.com/terraform-docs/terraform-docs) required for `terraform_docs` hook.
* [`terragrunt`](https://terragrunt.gruntwork.io/docs/getting-started/install/) required for `terragrunt_validate` hook.
* [`terrascan`](https://github.com/accurics/terrascan) required for `terrascan` hook.
* [`TFLint`](https://github.com/terraform-linters/tflint) required for `terraform_tflint` hook.
* [`TFSec`](https://github.com/liamg/tfsec) required for `terraform_tfsec` hook.
* [`infracost`](https://github.com/infracost/infracost) required for `infracost_breakdown` hook.
* [`jq`](https://github.com/stedolan/jq) required for `infracost_breakdown` hook.
<details><summary><b>Docker</b></summary><br>
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When `--build-arg` is not specified, the latest version of `pre-commit` and `terraform` will be installed.
```bash
git clone git@github.com:antonbabenko/pre-commit-terraform.git
cd pre-commit-terraform
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# Install the latest versions of all the tools
docker build -t pre-commit --build-arg INSTALL_ALL=true .
```
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To install a specific version of individual tools, define it using `--build-arg` arguments or set it to `latest`:
```bash
docker build -t pre-commit \
--build-arg PRE_COMMIT_VERSION=latest \
--build-arg TERRAFORM_VERSION=latest \
--build-arg CHECKOV_VERSION=2.0.405 \
--build-arg INFRACOST_VERSION=latest \
--build-arg TERRAFORM_DOCS_VERSION=0.15.0 \
--build-arg TERRAGRUNT_VERSION=latest \
--build-arg TERRASCAN_VERSION=1.10.0 \
--build-arg TFLINT_VERSION=0.31.0 \
--build-arg TFSEC_VERSION=latest \
.
```
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Set `-e PRE_COMMIT_COLOR=never` to disable the color output in `pre-commit`.
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</details>
<details><summary><b>MacOS</b></summary><br>
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[`coreutils`](https://formulae.brew.sh/formula/coreutils) is required for `terraform_validate` hook on MacOS (due to use of `realpath`).
```bash
brew install pre-commit terraform-docs tflint tfsec coreutils checkov terrascan infracost jq
```
</details>
<details><summary><b>Ubuntu 18.04</b></summary><br>
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```bash
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sudo apt update
sudo apt install -y unzip software-properties-common
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sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install -y python3.7 python3-pip
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python3 -m pip install --upgrade pip
pip3 install --no-cache-dir pre-commit
python3.7 -m pip install -U checkov
curl -L "$(curl -s https://api.github.com/repos/terraform-docs/terraform-docs/releases/latest | grep -o -E -m 1 "https://.+?-linux-amd64.tar.gz")" > terraform-docs.tgz && tar -xzf terraform-docs.tgz && rm terraform-docs.tgz && chmod +x terraform-docs && sudo mv terraform-docs /usr/bin/
curl -L "$(curl -s https://api.github.com/repos/terraform-linters/tflint/releases/latest | grep -o -E -m 1 "https://.+?_linux_amd64.zip")" > tflint.zip && unzip tflint.zip && rm tflint.zip && sudo mv tflint /usr/bin/
curl -L "$(curl -s https://api.github.com/repos/aquasecurity/tfsec/releases/latest | grep -o -E -m 1 "https://.+?tfsec-linux-amd64")" > tfsec && chmod +x tfsec && sudo mv tfsec /usr/bin/
curl -L "$(curl -s https://api.github.com/repos/accurics/terrascan/releases/latest | grep -o -E -m 1 "https://.+?_Linux_x86_64.tar.gz")" > terrascan.tar.gz && tar -xzf terrascan.tar.gz terrascan && rm terrascan.tar.gz && sudo mv terrascan /usr/bin/ && terrascan init
sudo apt install -y jq && \
curl -L "$(curl -s https://api.github.com/repos/infracost/infracost/releases/latest | grep -o -E -m 1 "https://.+?-linux-amd64.tar.gz")" > infracost.tgz && tar -xzf infracost.tgz && rm infracost.tgz && sudo mv infracost-linux-amd64 /usr/bin/infracost && infracost register
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```
</details>
<details><summary><b>Ubuntu 20.04</b></summary><br>
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```bash
sudo apt update
sudo apt install -y unzip software-properties-common python3 python3-pip
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python3 -m pip install --upgrade pip
pip3 install --no-cache-dir pre-commit
pip3 install --no-cache-dir checkov
curl -L "$(curl -s https://api.github.com/repos/terraform-docs/terraform-docs/releases/latest | grep -o -E -m 1 "https://.+?-linux-amd64.tar.gz")" > terraform-docs.tgz && tar -xzf terraform-docs.tgz terraform-docs && rm terraform-docs.tgz && chmod +x terraform-docs && sudo mv terraform-docs /usr/bin/
curl -L "$(curl -s https://api.github.com/repos/accurics/terrascan/releases/latest | grep -o -E -m 1 "https://.+?_Linux_x86_64.tar.gz")" > terrascan.tar.gz && tar -xzf terrascan.tar.gz terrascan && rm terrascan.tar.gz && sudo mv terrascan /usr/bin/ && terrascan init
curl -L "$(curl -s https://api.github.com/repos/terraform-linters/tflint/releases/latest | grep -o -E -m 1 "https://.+?_linux_amd64.zip")" > tflint.zip && unzip tflint.zip && rm tflint.zip && sudo mv tflint /usr/bin/
curl -L "$(curl -s https://api.github.com/repos/aquasecurity/tfsec/releases/latest | grep -o -E -m 1 "https://.+?tfsec-linux-amd64")" > tfsec && chmod +x tfsec && sudo mv tfsec /usr/bin/
sudo apt install -y jq && \
curl -L "$(curl -s https://api.github.com/repos/infracost/infracost/releases/latest | grep -o -E -m 1 "https://.+?-linux-amd64.tar.gz")" > infracost.tgz && tar -xzf infracost.tgz && rm infracost.tgz && sudo mv infracost-linux-amd64 /usr/bin/infracost && infracost register
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```
</details>
<!-- markdownlint-enable no-inline-html -->
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### 2. Install the pre-commit hook globally
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> Note: not needed if you use the Docker image
```bash
DIR=~/.git-template
git config --global init.templateDir ${DIR}
pre-commit init-templatedir -t pre-commit ${DIR}
```
### 3. Add configs and hooks
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Step into the repository you want to have the pre-commit hooks installed and run:
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```bash
git init
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cat <<EOF > .pre-commit-config.yaml
repos:
- repo: https://github.com/antonbabenko/pre-commit-terraform
rev: <VERSION> # Get the latest from: https://github.com/antonbabenko/pre-commit-terraform/releases
hooks:
- id: terraform_fmt
- id: terraform_docs
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EOF
```
### 4. Run
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Execute this command to run `pre-commit` on all files in the repository (not only changed files):
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```bash
pre-commit run -a
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```
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Or, using Docker:
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```bash
docker run -v $(pwd):/lint -w /lint pre-commit run -a
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```
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Execute this command to list the versions of the tools in Docker:
```bash
docker run --entrypoint cat pre-commit:latest /usr/bin/tools_versions_info
```
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## Available Hooks
There are several [pre-commit](https://pre-commit.com/) hooks to keep Terraform configurations (both `*.tf` and `*.tfvars`) and Terragrunt configurations (`*.hcl`) in a good shape:
<!-- markdownlint-disable no-inline-html -->
| Hook name | Description | Dependencies<br><sup>[Install instructions here](#1-install-dependencies)</sup> |
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| ------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| `checkov` | [checkov](https://github.com/bridgecrewio/checkov) static analysis of terraform templates to spot potential security issues. [Hook notes](#checkov) | `checkov`<br>Ubuntu deps: `python3`, `python3-pip` |
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| `infracost_breakdown` | Check how much your infra costs with [infracost](https://github.com/infracost/infracost). [Hook notes](#infracost_breakdown) | `infracost`, `jq`, [Infracost API key](https://www.infracost.io/docs/#2-get-api-key)
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| `terraform_docs_replace` | Runs `terraform-docs` and pipes the output directly to README.md | `python3`, `terraform-docs` |
| `terraform_docs_without_`<br>`aggregate_type_defaults` | Inserts input and output documentation into `README.md` without aggregate type defaults. Hook notes same as for [terraform_docs](#terraform_docs) | `terraform-docs` |
| `terraform_docs` | Inserts input and output documentation into `README.md`. Recommended. [Hook notes](#terraform_docs) | `terraform-docs` |
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| `terraform_fmt` | Reformat all Terraform configuration files to a canonical format. [Hook notes](#terraform_fmt) | - |
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| `terraform_providers_lock` | Updates provider signatures in [dependency lock files](https://www.terraform.io/docs/cli/commands/providers/lock.html). [Hook notes](#terraform_providers_lock) | - |
| `terraform_tflint` | Validates all Terraform configuration files with [TFLint](https://github.com/terraform-linters/tflint). [Available TFLint rules](https://github.com/terraform-linters/tflint/tree/master/docs/rules#rules). [Hook notes](#terraform_tflint). | `tflint` |
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| `terraform_tfsec` | [TFSec](https://github.com/aquasecurity/tfsec) static analysis of terraform templates to spot potential security issues. [Hook notes](#terraform_tfsec) | `tfsec` |
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| `terraform_validate` | Validates all Terraform configuration files. [Hook notes](#terraform_validate) | - |
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| `terragrunt_fmt` | Reformat all [Terragrunt](https://github.com/gruntwork-io/terragrunt) configuration files (`*.hcl`) to a canonical format. | `terragrunt` |
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| `terragrunt_validate` | Validates all [Terragrunt](https://github.com/gruntwork-io/terragrunt) configuration files (`*.hcl`) | `terragrunt` |
| `terrascan` | [terrascan](https://github.com/accurics/terrascan) Detect compliance and security violations. | `terrascan` |
<!-- markdownlint-enable no-inline-html -->
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Check the [source file](https://github.com/antonbabenko/pre-commit-terraform/blob/master/.pre-commit-hooks.yaml) to know arguments used for each hook.
## Hooks usage notes and examples
### checkov
For [checkov](https://github.com/bridgecrewio/checkov) you need to specify each argument separately:
```yaml
- id: checkov
args: [
"-d", ".",
"--skip-check", "CKV2_AWS_8",
]
```
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### infracost_breakdown
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`infracost_breakdown` executes `infracost breakdown` command and compare the estimated costs with those specified in the hook-config. `infracost breakdown` normally runs `terraform init`, `terraform plan`, and calls Infracost Cloud Pricing API (remote version or [self-hosted version](https://www.infracost.io/docs/cloud_pricing_api/self_hosted)).
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Unlike most other hooks, this hook triggers once if there are any changed files in the repository.
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1. `infracost_breakdown` supports [all `infracost breakdown` arguments](https://www.infracost.io/docs/#useful-options). The following example only shows costs:
```yaml
- id: infracost_breakdown
args:
- --args=--path=./env/dev
verbose: true # Always show costs
```
<!-- markdownlint-disable-next-line no-inline-html -->
<details><summary>Output</summary>
```bash
Running in "env/dev"
Summary: {
"unsupportedResourceCounts": {
"aws_sns_topic_subscription": 1
}
}
Total Monthly Cost: 86.83 USD
Total Monthly Cost (diff): 86.83 USD
```
<!-- markdownlint-disable-next-line no-inline-html -->
</details>
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2. (Optionally) Define `cost constrains` the hook should evaluate successfully in order to pass:
```yaml
- id: infracost_breakdown
args:
- --args=--path=./env/dev
- --hook-config=.totalHourlyCost|tonumber > 0.1
- --hook-config=.totalHourlyCost|tonumber > 1
- --hook-config=.projects[].diff.totalMonthlyCost|tonumber != 10000
- --hook-config=.currency == "USD"
```
<!-- markdownlint-disable-next-line no-inline-html -->
<details><summary>Output</summary>
```bash
Running in "env/dev"
Passed: .totalHourlyCost|tonumber > 0.1 0.11894520547945205 > 0.1
Failed: .totalHourlyCost|tonumber > 1 0.11894520547945205 > 1
Passed: .projects[].diff.totalMonthlyCost|tonumber !=10000 86.83 != 10000
Passed: .currency == "USD" "USD" == "USD"
Summary: {
"unsupportedResourceCounts": {
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"aws_sns_topic_subscription": 1
}
}
Total Monthly Cost: 86.83 USD
Total Monthly Cost (diff): 86.83 USD
```
<!-- markdownlint-disable-next-line no-inline-html -->
</details>
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* Only one path per one hook (`- id: infracost_breakdown`) is allowed.
* Set `verbose: true` to see cost even when the checks are passed.
* Hook uses `jq` to process the cost estimation report returned by `infracost breakdown` command
* Expressions defined as `--hook-config` argument should be in a jq-compatible format (e.g. `.totalHourlyCost`, `.totalMonthlyCost`)
To study json output produced by `infracost`, run the command `infracost breakdown -p PATH_TO_TF_DIR --format json`, and explore it on [jqplay.org](https://jqplay.org/).
* Supported comparison operators: `<`, `<=`, `==`, `!=`, `>=`, `>`.
* Most useful paths and checks:
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* `.totalHourlyCost` (same as `.projects[].breakdown.totalHourlyCost`) - show total hourly infra cost
* `.totalMonthlyCost` (same as `.projects[].breakdown.totalMonthlyCost`) - show total monthly infra cost
* `.projects[].diff.totalHourlyCost` - show the difference in hourly cost for the existing infra and tf plan
* `.projects[].diff.totalMonthlyCost` - show the difference in monthly cost for the existing infra and tf plan
* `.diffTotalHourlyCost` (for Infracost version 0.9.12 or newer) or `[.projects[].diff.totalMonthlyCost | select (.!=null) | tonumber] | add` (for Infracost older than 0.9.12)
* To disable hook color output, set `PRE_COMMIT_COLOR=never` env var.
3. **Docker usage**. In `docker build` or `docker run` command:
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* You need to provide [Infracost API key](https://www.infracost.io/docs/integrations/environment_variables/#infracost_api_key) via `-e INFRACOST_API_KEY=<your token>`. By default, it is saved in `~/.config/infracost/credentials.yml`
* Set `-e INFRACOST_SKIP_UPDATE_CHECK=true` to [skip the Infracost update check](https://www.infracost.io/docs/integrations/environment_variables/#infracost_skip_update_check) if you use this hook as part of your CI/CD pipeline.
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### terraform_docs
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1. `terraform_docs` and `terraform_docs_without_aggregate_type_defaults` will insert/update documentation generated by [terraform-docs](https://github.com/terraform-docs/terraform-docs) framed by markers:
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```txt
<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
```
if they are present in `README.md`.
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2. It is possible to pass additional arguments to shell scripts when using `terraform_docs` and `terraform_docs_without_aggregate_type_defaults`.
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3. It is possible to automatically:
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* create documentation file
* extend existing documentation file by appending markers to the end of the file (see item 1 above)
* use different filename for the documentation (default is `README.md`)
```yaml
- id: terraform_docs
args:
- --hook-config=--path-to-file=README.md # Valid UNIX path. I.e. ../TFDOC.md or docs/README.md etc.
- --hook-config=--add-to-exiting-file=true # Boolean. true or false
- --hook-config=--create-file-if-not-exist=true # Boolean. true or false
```
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4. You can provide [any configuration available in `terraform-docs`](https://terraform-docs.io/user-guide/configuration/) as argument to `terraform_doc` hook, for example:
```yaml
- id: terraform_docs
args:
- --args=--config=.terraform-docs.yml
5. If you need some exotic settings, it can be done too. I.e. this one generates HCL files:
```yaml
- id: terraform_docs
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args:
- tfvars hcl --output-file terraform.tfvars.model .
```
### terraform_docs_replace
`terraform_docs_replace` replaces the entire README.md rather than doing string replacement between markers. Put your additional documentation at the top of your `main.tf` for it to be pulled in. The optional `--dest` argument lets you change the filename that gets created/modified.
Example:
```yaml
- id: terraform_docs_replace
args:
- --sort-by-required
- --dest=TEST.md
```
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### terraform_fmt
1. `terraform_fmt` supports custom arguments so you can pass [supported flags](https://www.terraform.io/docs/cli/commands/fmt.html#usage). Eg:
```yaml
- id: terraform_fmt
args:
- --args=-no-color
- --args=-diff
- --args=-write=false
```
### terraform_providers_lock
1. The hook requires Terraform 0.14 or later.
2. The hook invokes two operations that can be really slow:
* `terraform init` (in case `.terraform` directory is not initialised)
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* `terraform providers lock`
Both operations require downloading data from remote Terraform registries, and not all of that downloaded data or meta-data is currently being cached by Terraform.
3. `terraform_providers_lock` supports custom arguments:
```yaml
- id: terraform_providers_lock
args:
- '--args=-platform=windows_amd64'
- '--args=-platform=darwin_amd64'
```
4. It may happen that Terraform working directory (`.terraform`) already exists but not in the best condition (eg, not initialized modules, wrong version of Terraform, etc.). To solve this problem, you can find and delete all `.terraform` directories in your repository:
```bash
echo "
function rm_terraform {
find . -name ".terraform*" -print0 | xargs -0 rm -r
}
" >>~/.bashrc
# Reload shell and use `rm_terraform` command in the repo root
```
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`terraform_providers_lock` hook will try to reinitialize directories before running the `terraform providers lock` command.
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### terraform_tflint
1. `terraform_tflint` supports custom arguments so you can enable module inspection, deep check mode, etc.
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Example:
```yaml
- id: terraform_tflint
args:
- --args=--deep
- --args=--enable-rule=terraform_documented_variables
```
2. When you have multiple directories and want to run `tflint` in all of them and share a single config file, it is impractical to hard-code the path to the `.tflint.hcl` file. The solution is to use the `__GIT_WORKING_DIR__` placeholder which will be replaced by `terraform_tflint` hooks with Git working directory (repo root) at run time. For example:
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```yaml
- id: terraform_tflint
args:
- --args=--config=__GIT_WORKING_DIR__/.tflint.hcl
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```
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### terraform_tfsec
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1. `terraform_tfsec` will consume modified files that pre-commit
passes to it, so you can perform whitelisting of directories
or files to run against via [files](https://pre-commit.com/#config-files)
pre-commit flag
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Example:
```yaml
- id: terraform_tfsec
files: ^prd-infra/
```
The above will tell pre-commit to pass down files from the `prd-infra/` folder
only such that the underlying `tfsec` tool can run against changed files in this
directory, ignoring any other folders at the root level
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2. To ignore specific warnings, follow the convention from the
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[documentation](https://github.com/aquasecurity/tfsec#ignoring-warnings).
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Example:
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```hcl
resource "aws_security_group_rule" "my-rule" {
type = "ingress"
cidr_blocks = ["0.0.0.0/0"] #tfsec:ignore:AWS006
}
```
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3. `terraform_tfsec` supports custom arguments, so you can pass supported `--no-color` or `--format` (output), `-e` (exclude checks) flags:
```yaml
- id: terraform_tfsec
args:
- >
--args=--format json
--no-color
-e aws-s3-enable-bucket-logging,aws-s3-specify-public-access-block
```
4. When you have multiple directories and want to run `tfsec` in all of them and share a single config file - use the `__GIT_WORKING_DIR__` placeholder. It will be replaced by `terraform_tfsec` hooks with Git working directory (repo root) at run time. For example:
```yaml
- id: terraform_tfsec
args:
- --args=--config-file=__GIT_WORKING_DIR__/.tfsec.json
```
Otherwise, will be used files that located in sub-folders:
```yaml
- id: terraform_tfsec
args:
- --args=--config-file=.tfsec.json
```
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### terraform_validate
1. `terraform_validate` supports custom arguments so you can pass supported `-no-color` or `-json` flags:
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```yaml
- id: terraform_validate
args:
- --args=-json
- --args=-no-color
```
2. `terraform_validate` also supports custom environment variables passed to the pre-commit runtime:
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```yaml
- id: terraform_validate
args:
- --envs=AWS_DEFAULT_REGION="us-west-2"
- --envs=AWS_ACCESS_KEY_ID="anaccesskey"
- --envs=AWS_SECRET_ACCESS_KEY="asecretkey"
```
3. It may happen that Terraform working directory (`.terraform`) already exists but not in the best condition (eg, not initialized modules, wrong version of Terraform, etc.). To solve this problem, you can find and delete all `.terraform` directories in your repository:
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```bash
echo "
function rm_terraform {
find . -name ".terraform*" -print0 | xargs -0 rm -r
}
" >>~/.bashrc
# Reload shell and use `rm_terraform` command in the repo root
```
`terraform_validate` hook will try to reinitialize them before running the `terraform validate` command.
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**Warning:** If you use Terraform workspaces, DO NOT use this workaround ([details](https://github.com/antonbabenko/pre-commit-terraform/issues/203#issuecomment-918791847)). Wait to [`force-init`](https://github.com/antonbabenko/pre-commit-terraform/issues/224) option implementation.
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## Authors
This repository is managed by [Anton Babenko](https://github.com/antonbabenko) with help from these awesome contributors:
<!-- markdownlint-disable no-inline-html -->
<a href="https://github.com/antonbabenko/pre-commit-terraform/graphs/contributors">
<img src="https://contrib.rocks/image?repo=antonbabenko/pre-commit-terraform" />
</a>
<!-- markdownlint-enable no-inline-html -->
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## License
MIT licensed. See [LICENSE](LICENSE) for full details.