[WIP] Add terragrunt functions so we can work with tofu/terraform

.pre-commit-hooks.yaml

@@ -9,6 +9,15 @@
   exclude: \.+.terraform\/.*$
   require_serial: true
 
+- id: terragrunt-fmt
+  name: Terragrunt fmt
+  description: Rewrites all Terraform configuration files to a canonical format using terragrunt.
+  entry: hooks/terragrunt-fmt.sh
+  language: script
+  files: \.tf$
+  exclude: \.+.terraform\/.*$
+  require_serial: true
+
 - id: terraform-validate
   name: Terraform validate
   description: Validates all Terraform configuration files
@@ -18,6 +27,15 @@
   exclude: \.+.terraform\/.*$
   require_serial: true
 
+- id: terragrunt-validate
+  name: Terragrunt validate
+  description: Validates all Terraform configuration files using terragrunt.
+  entry: hooks/terragrunt-validate.sh
+  language: script
+  files: \.tf$
+  exclude: \.+.terraform\/.*$
+  require_serial: true
+
 - id: packer-validate
   name: Packer validate
   description: Validates all Packer configuration files
@@ -46,6 +64,18 @@
       .+\.terragrunt-cache\/.*$|
     )$
 
+- id: terragrunt-hclvalidate
+  name: Terragrunt hclvalidate
+  description: Validates all Terragrunt configuration files to a canonical format
+  entry: hooks/terragrunt-hclvalidate.sh
+  language: script
+  files: \.hcl$
+  exclude: >
+    (?x)^(
+      .+\.terraform\/.*$|
+      .+\.terragrunt-cache\/.*$|
+    )$
+
 - id: shellcheck
   name: Shellcheck Bash Linter
   description: Performs linting on bash scripts

hooks/terragrunt-fmt.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -e
+
+# OSX GUI apps do not pick up environment variables the same way as Terminal apps and there are no easy solutions,
+# especially as Apple changes the GUI app behavior every release (see https://stackoverflow.com/q/135688/483528). As a
+# workaround to allow GitHub Desktop to work, add this (hopefully harmless) setting here.
+original_path=$PATH
+export PATH=$PATH:/usr/local/bin
+
+# Store and return last failure from fmt so this can validate every directory passed before exiting
+FMT_ERROR=0
+
+for file in "$@"; do
+  terragrunt --terragrunt-no-auto-init fmt -diff -check "$file" || FMT_ERROR=$?
+done
+
+# reset path to the original value
+export PATH=$original_path
+
+exit ${FMT_ERROR}

hooks/terragrunt-hclvalidate.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -e
+
+# OSX GUI apps do not pick up environment variables the same way as Terminal apps and there are no easy solutions,
+# especially as Apple changes the GUI app behavior every release (see https://stackoverflow.com/q/135688/483528). As a
+# workaround to allow GitHub Desktop to work, add this (hopefully harmless) setting here.
+export PATH=$PATH:/usr/local/bin
+
+for file in "$@"; do
+  pushd "$(dirname "$file")" >/dev/null
+   terragrunt hclvalidate "$(basename "$file")"
+  popd >/dev/null
+done

hooks/terragrunt-validate.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -e
+
+# OSX GUI apps do not pick up environment variables the same way as Terminal apps and there are no easy solutions,
+# especially as Apple changes the GUI app behavior every release (see https://stackoverflow.com/q/135688/483528). As a
+# workaround to allow GitHub Desktop to work, add this (hopefully harmless) setting here.
+export PATH=$PATH:/usr/local/bin
+
+# Disable output not usually helpful when running in automation (such as guidance to run plan after init)
+export TF_IN_AUTOMATION=1
+
+# Store and return last failure from validate so this can validate every directory passed before exiting
+VALIDATE_ERROR=0
+
+for dir in $(echo "$@" | xargs -n1 dirname | sort -u | uniq); do
+  echo "--> Running 'terraform validate' in directory '$dir'"
+  pushd "$dir" >/dev/null
+  terragrunt init -backend=false || VALIDATE_ERROR=$?
+  terragrunt validate || VALIDATE_ERROR=$?
+  popd >/dev/null
+done
+
+exit ${VALIDATE_ERROR}