first commit

.github/workflows/tag-release.yml

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+name: Tag release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  create_tag:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: check if tag already exists
+        run: git fetch --depth=1 origin +refs/tags/*:refs/tags/* && git rev-parse "$(cat VERSION)" >/dev/null 2>&1 && exit 1 || exit 0
+
+      - name: create tag
+        run: |
+          git config --global user.email "${{ github.actor }}"
+          git config --global user.name "${{ github.actor }}"
+          git tag -a -m "$(cat VERSION)" $(cat VERSION)
+          git push --follow-tags

.github/workflows/test.yml

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+name: Run tests
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  run_tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: setup git
+        run: |
+          git config --global user.email "${{ github.actor }}"
+          git config --global user.name "${{ github.actor }}"
+
+      - name: test failure on no terraform version
+        id: fail_no_version
+        continue-on-error: true
+        uses: ./
+
+      - name: no terraform version failed
+        if: steps.fail_no_version.outcome != 'failure'
+        run: exit 1
+
+      - name: test failure on invalid terraform version
+        id: fail_invalid_version
+        continue-on-error: true
+        uses: ./
+        with:
+          terraform_version: asdf
+
+      - name: invalid terraform version failed
+        if: steps.fail_invalid_version.outcome != 'failure'
+        run: exit 1
+
+      - name: test failure on missing terraform version
+        id: fail_missing_version
+        continue-on-error: true
+        uses: ./
+        with:
+          terraform_version: 999.999.999
+
+      - name: missing terraform version failed
+        if: steps.fail_no_version.outcome != 'failure'
+        run: exit 1
+
+      - name: munge test.tf for a failing commit
+        run: echo "" >> test.tf
+
+      - name: commit the munged test.tf
+        run: git add . && git commit -m "running tests"
+
+      - name: test failure
+        id: failure_step
+        continue-on-error: true
+        uses: ./
+        with:
+          terraform_version: 0.14.6
+
+      - name: failure failed
+        if: steps.failure_step.outcome != 'failure'
+        run: exit 1
+
+      - name: commit the newly fmt'd files
+        run: git add . && git commit -m "running tests"
+
+      - name: test success on the new commit
+        uses: ./
+        with:
+          terraform_version: 0.14.6
+
+  check_version:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: check if tag already exists
+        run: git fetch --depth=1 origin +refs/tags/*:refs/tags/* && git rev-parse "$(cat VERSION)" >/dev/null 2>&1 && exit 1 || exit 0

Dockerfile

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+# Container image that runs your code
+FROM alpine:3.10
+
+RUN apk update && apk add curl unzip git
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# Enforce Terraform fmt
+Status check which fails if any of the committed files have changes after running `terraform fmt`
+
+## Example usage
+```yaml
+uses: leigholiver/[email protected]
+with:
+  terraform_version: 0.14.6
+```
+
+## Inputs
+### `terraform_version`
+**Required** The Terraform version to use
+
+## Outputs
+### `diff`
+The diff of terraform fmt changes

VERSION

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+v1.0.0

action.yml

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+name: 'Enforce Terraform fmt'
+description: 'Status check which fails if any of the committed files have changes after running `terraform fmt`'
+branding:
+  icon: git-pull-request
+  color: purple
+inputs:
+  terraform_version:
+    description: 'The Terraform version to use'
+    required: true
+outputs:
+  diff:
+    description: 'The diff of terraform fmt changes'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.terraform_version }}

entrypoint.sh

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+#!/bin/sh -l
+set -e
+
+if [ -z "${INPUT_TERRAFORM_VERSION}" ]; then
+  echo "No terraform version specified"
+  exit 1
+fi
+
+VERSION=$(expr "${INPUT_TERRAFORM_VERSION}" : [0-9]\\+\.[0-9]\\+\.[0-9]\\+)
+if [ "$VERSION" = "0" ]; then
+  echo "Invalid terraform version specified"
+  exit 1
+fi
+
+# get terraform
+curl "https://releases.hashicorp.com/terraform/${INPUT_TERRAFORM_VERSION}/terraform_${INPUT_TERRAFORM_VERSION}_linux_amd64.zip" \
+--output terraform_${INPUT_TERRAFORM_VERSION}_linux_amd64.zip
+
+if [ -f "terraform_${INPUT_TERRAFORM_VERSION}_linux_amd64.zip" ]; then
+    unzip -o terraform_${INPUT_TERRAFORM_VERSION}_linux_amd64.zip
+else
+  echo "Couldn't find terraform version"
+  exit 1
+fi
+
+# get the changed .tf/.tf.json files
+FAILED="false"
+for FILENAME in $(git diff --name-only HEAD HEAD~1); do
+    if [ ! $(expr "${FILENAME}" : ".*\.[tf|tf.json]") = "0" ]; then
+        # fmt them
+        RESULT=$(./terraform fmt ${FILENAME} 2> /dev/null || echo "error")
+        if [ "${RESULT}" = "${FILENAME}" ] || [ "${RESULT}" = "error" ]; then
+            FAILED="true"
+            echo "${FILENAME} failed"
+        else
+          echo "${FILENAME} is ok"
+        fi
+    fi
+done
+
+if [ "$FAILED" = "true" ] ; then
+    # output the git diff
+    echo "::set-output name=diff::$(git diff $(git diff --name-only HEAD HEAD~1))"
+    exit 1
+fi
+exit 0

test.tf

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+terraform {
+required_version = ">= 0.12.26"
+}