From 20099b81d24086413e248680427595dbad4e044d Mon Sep 17 00:00:00 2001
From: Yohan Belval <ybelval@turo.com>
Date: Tue, 12 Nov 2024 15:40:49 +0000
Subject: [PATCH] feat(lint): add caching layer to terraform

---
 lint/action.yaml | 26 ++++++++++++++++++++++++++
 test/action.yaml | 30 ++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/lint/action.yaml b/lint/action.yaml
index 750eb7c..186cbb3 100644
--- a/lint/action.yaml
+++ b/lint/action.yaml
@@ -37,6 +37,32 @@ runs:
     - name: Setup tools
       # Provide opportunity to install terraform, golang, and others
       uses: open-turo/action-setup-tools@v2
+
+    - name: Configure Terraform plugin cache
+      shell: bash
+      run: |
+        echo "TF_PLUGIN_CACHE_DIR=$HOME/.terraform.d/plugin-cache" >>"$GITHUB_ENV"
+        mkdir --parents "$HOME/.terraform.d/plugin-cache"
+    - name: Compute terraform plugin cache key
+      if: inputs.s3-bucket-name != ''
+      id: tf_plugin_cache_key
+      run: |
+        echo "key=terraform-${{ runner.os }}-${{ hashFiles('**/.terraform.lock.hcl') }}" >> $GITHUB_OUTPUT
+      shell: bash
+    - name: Load cached terraform plugins if available
+      if: inputs.s3-bucket-name != ''
+      uses: everpcpc/actions-cache@v2
+      id: read_cache
+      with:
+        bucket: ${{ inputs.s3-bucket-name }}
+        use-fallback: false
+        path: ~/.terraform.d/plugin-cache
+        key: ${{ env.cache-name }}-${{ steps.tf_plugin_cache_key.outputs.key }}
+        restore-keys: ${{ env.cache-name }}-
+      env:
+        AWS_REGION: ${{ inputs.s3-bucket-region }}
+        cache-name: ${{ github.event.repository.name }}/cache-tf-plugins
+
     - name: Pre-commit
       uses: open-turo/action-pre-commit@v3
       with:
diff --git a/test/action.yaml b/test/action.yaml
index 5b6d91d..34e04dd 100644
--- a/test/action.yaml
+++ b/test/action.yaml
@@ -18,6 +18,12 @@ inputs:
   aws-secret-access-key:
     required: false
     description: Secret access key that grants access to AWS services. Requires aws-access-key-id input as well.
+  s3-bucket-name:
+    required: false
+    description: S3 bucket name to cache dependencies to speed up runs.
+  s3-bucket-region:
+    required: false
+    description: S3 bucket region to cache dependencies to speed up runs.
 
 runs:
   using: composite
@@ -39,6 +45,30 @@ runs:
       run: |
         if [[ ! -f ./script/setup ]]; then echo "Missing required file: ./script/setup"; exit 1; fi
         if [[ ! -f ./script/test ]]; then echo "Missing required file: ./script/test"; exit 1; fi
+    - name: Configure Terraform plugin cache
+      shell: bash
+      run: |
+        echo "TF_PLUGIN_CACHE_DIR=$HOME/.terraform.d/plugin-cache" >>"$GITHUB_ENV"
+        mkdir --parents "$HOME/.terraform.d/plugin-cache"
+    - name: Compute terraform plugin cache key
+      if: inputs.s3-bucket-name != ''
+      id: tf_plugin_cache_key
+      run: |
+        echo "key=terraform-${{ runner.os }}-${{ hashFiles('**/.terraform.lock.hcl') }}" >> $GITHUB_OUTPUT
+      shell: bash
+    - name: Load cached terraform plugins if available
+      if: inputs.s3-bucket-name != ''
+      uses: everpcpc/actions-cache@v2
+      id: read_cache
+      with:
+        bucket: ${{ inputs.s3-bucket-name }}
+        use-fallback: false
+        path: ~/.terraform.d/plugin-cache
+        key: ${{ env.cache-name }}-${{ steps.tf_plugin_cache_key.outputs.key }}
+        restore-keys: ${{ env.cache-name }}-
+      env:
+        AWS_REGION: ${{ inputs.s3-bucket-region }}
+        cache-name: ${{ github.event.repository.name }}/cache-tf-plugins
     - name: Setup
       shell: bash
       run: ./script/setup