test: run tofu linting using pre-commit

.github/workflows/lint.yml

@@ -6,27 +6,6 @@ on:
   pull_request:
 
 jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: opentofu/setup-opentofu@v1
-        with:
-          tofu_version: v1.7.2 # renovate: datasource=github-releases depName=opentofu/opentofu
-          tofu_wrapper: false
-
-      - run: |
-          tofu init
-          tofu validate
-          tofu fmt
-
-      - name: Check uncommitted changes
-        run: git diff --exit-code
-
-      - if: failure()
-        run: echo "::error::Check failed, please run 'tofu validate; tofu fmt' and commit the changes."
-
   pre-commit:
     runs-on: ubuntu-latest
     steps:
@@ -37,6 +16,11 @@ jobs:
         with:
           python-version: 3.x
 
+      - uses: opentofu/setup-opentofu@v1
+        with:
+          tofu_version: v1.7.2 # renovate: datasource=github-releases depName=opentofu/opentofu
+          tofu_wrapper: false
+
       - name: Install dependencies
         run: pip install pre-commit
 

.gitignore

@@ -0,0 +1 @@
+.terraform/

.pre-commit-config.yaml

@@ -28,3 +28,23 @@ repos:
       - id: prettier
         files: \.(md|ya?ml)$
         exclude: ^CHANGELOG.md$
+
+  - repo: local
+    hooks:
+      - id: tofu fmt
+        name: tofu fmt
+        description: Format Terraform files.
+        require_serial: true
+        pass_filenames: false
+        entry: make fmt
+        language: system
+        files: (\.tf|\.tfvars)$
+
+      - id: tofu validate
+        name: tofu validate
+        description: Validates Terraform files.
+        require_serial: true
+        pass_filenames: false
+        entry: make validate
+        language: system
+        files: (\.tf|\.tfvars)$

Makefile

@@ -0,0 +1,10 @@
+SHELL = bash
+
+.terraform:
+	tofu init -backend=false
+
+fmt: .terraform
+	tofu fmt -recursive
+
+validate: .terraform
+	tofu validate

example/Makefile

@@ -12,6 +12,9 @@ env.auto.tfvars:
 .terraform:
 	tofu init
 
+validate: .terraform
+	tofu validate
+
 up: .terraform env.auto.tfvars
 	tofu apply -auto-approve
 	$(MAKE) port-forward