Trunk - The New Super linter | CloudFalcon Blog

> **The DevOps super linter and formater**

What is Trunk? and How are we using it with Terraform and Docker

Trunk is a **blazingly** fast meta code checker and formatter with extraordinary features like caching, preexisting issue detection, a daemon, and a language server.

Install

bash

curl https://get.trunk.io -fsSL | bash

Or with:

[

](https://marketplace.visualstudio.com/items?itemName=Trunk.io)

:::caution - Init Must be in root git level

✖ Trunk can only init if it's run at the root of a git repo

:::

:::caution - Init Must be with commited files existed

✖ No committed files in repo, unable to analyze files. Trunk init enables linters automatically based on the contents of your repo, so you must have something in your repo for it to work.

:::

Initialize trunk in your repo

bash

trunk init

Run 30+ linters on your repo

bash

trunk check

Auto-format your repo

bash

trunk fmt

![Terraform](https://img.shields.io/badge/terraform-%235835CC.svg?style=for-the-badge&logo=terraform&logoColor=white)

hcl

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.0"
    }
  }
}

# Configure the AWS Provider
provider "aws" {
  region = "us-east-1"
  access_key = "my-access-key"
  secret_key = "my-secret-key"
}

# Create a VPC
resource "aws_vpc" "example" {
  cidr_block = "10.0.0.0/16"
}

![Docker](https://img.shields.io/badge/docker-%230db7ed.svg?style=for-the-badge&logo=docker&logoColor=white)

docker

# syntax=docker/dockerfile:1
FROM node:12-alpine
RUN apk add --no-cache python2 g++ make
WORKDIR /app
COPY . .
RUN yarn install --production
CMD ["node", "src/index.js"]

Demo

bash

$ trunk init
Initializing

 ✔ Analyzing files in your repo... done (3 files in 0.01s)
 ✔ Detecting latest linter versions... done (3 linters in 0.00s)
 ✔ Creating config files... done (0.27s)


Enabled 3 Linters

 • gitleaks
 • hadolint (created .hadolint.yaml)
 • terraform-fmt


✔ Enabled 3 linters (see .trunk/trunk.yaml)
32 additional linters can be enabled in .trunk/trunk.yaml

bash

$ trunk check --all --no-fix
Checking 100% [====================================================================================>]  12/12  0.4s

  AUTOFIXES

main.tf
 1:1  high  Incorrect formatting  terraform-fmt

  10 | # Configure the AWS Provider
  11 | provider "aws" {
  12 |     region     = "us-east-1"
     |   region     = "us-east-1"
  13 |   access_key = "my-access-key"
  14 |      secret_key = "my-secret-key"
     |   secret_key = "my-secret-key"
  15 | }
  16 |

→ Apply autofix (Y/n): n
  Autofix discarded.

  ISSUES

Dockerfile:3:1
 3:1  medium  Pin versions in apk add. Instead of `apk add <package>` use `apk add <package>=<version>`  hadolint/DL3018
 6:1  low     `yarn cache clean` missing after `yarn install` was run.                                   hadolint/DL3060

main.tf:1:1
 1:1  high  Incorrect formatting, autoformat by running 'trunk fmt'  terraform-fmt

✖ 3 blocking issues

bash

$ trunk fmt
Checking 100% [======================================================================================>]  3/3  0.4s

 ✔ Auto-fixed main.tf

Re-checking autofixed files...

Checking 67% [==========================================================>                             ]  2/3  0.4s

✔ No issues