Fix tflint initialization

CHANGELOG.md

@@ -8,10 +8,17 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 Note: Can be used with `megalinter/megalinter@beta` in your GitHub Action mega-linter.yml file, or with `megalinter/megalinter:beta` docker image
 
+Linter updates:
+
 - New reporter **GITLAB_COMMENT_REPORTER** allowing to post MegaLinter results as comments on Gitlab merge requests
+- Add configuration file option for SQLFluff ([#1200](https://github.com/megalinter/megalinter/pull/1200))
 - secretlint: Use .gitignore as .secretlintignore if --secretlintignore is not defined and .secretlintignore not found ([#1207](https://github.com/megalinter/megalinter/issues/1207))
-- Fix v5 doc deployment when there is a new release ([1190](https://github.com/megalinter/megalinter/issues/1190))
+
+Fixes:
+
+- Fix v5 doc deployment when there is a new release ([#1190](https://github.com/megalinter/megalinter/issues/1190))
 - Fix issue when using `VALIDATE_ALL_CODEBASE: false` on Azure Pipelines by defining auth header in CI env variable GIT_AUTHORIZATION_BEARER ([#1125](https://github.com/megalinter/megalinter/issues/1125))
+- Fix tflint initialization so it uses configuration file when defined ([#1134](https://github.com/megalinter/megalinter/issues/1134))
 
 - Linter versions upgrades
   - [stylelint](https://stylelint.io) from 14.2.0 to **14.3.0** on 2022-01-23

megalinter/descriptors/terraform.megalinter-descriptor.yml

@@ -6,16 +6,14 @@ file_extensions:
   - ".tf"
 linters:
   # TFLINT
-  - linter_name: tflint
+  - class: TfLintLinter
+    linter_name: tflint
     name: TERRAFORM_TFLINT
     linter_url: https://github.com/terraform-linters/tflint
     linter_rules_url: https://github.com/terraform-linters/tflint/tree/master/docs/rules#rules
     linter_rules_configuration_url: https://github.com/terraform-linters/tflint/blob/master/docs/guides/config.md
     linter_rules_inline_disable_url: https://github.com/terraform-linters/tflint/blob/master/docs/guides/annotations.md
     config_file_name: .tflint.hcl
-    pre_commands:
-      - command: tflint --init
-        cwd: workspace
     examples:
       - "tflint myfile.tf"
       - "tflint -c .tflint.hcl myfile.tf"

megalinter/linters/TfLintLinter.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""
+Use TfLint to lint terraform files
+https://github.com/terraform-linters/tflint
+"""
+import logging
+
+import megalinter
+
+
+class TfLintLinter(megalinter.Linter):
+
+    # To execute before linting files
+    def before_lint_files(self):
+        # Build pre-command
+        tflint_init_command = "tflint --init"
+        if self.config_file is not None:
+            tflint_init_command += f" --config {self.config_file}"
+        logging.debug("tflint before_lint_files: " + tflint_init_command)
+        # Add to pre-commands
+        tflint_pre_command = {"command": tflint_init_command, "cwd": self.workspace}
+        if self.pre_commands is None:
+            self.pre_commands = []
+        self.pre_commands.append(tflint_pre_command)