From 1cb3201b5eb7578acfe5b94c8fa5d18083b24366 Mon Sep 17 00:00:00 2001
From: Wade Simmons <wade@wades.im>
Date: Mon, 2 Mar 2020 16:21:19 -0500
Subject: [PATCH] Github Actions: cache modules and only run when necessary
 (#197)

This PR does two things:

- Only run the tests when relevant files change.
- Cache the Go Modules directory between runs, so they don't have to redownload everything everytime (go.sum is the cache key). Pretty much straight from the examples: https://github.com/actions/cache/blob/master/examples.md#go---modules
---
 .github/workflows/gofmt.yml |  3 +++
 .github/workflows/smoke.yml | 14 ++++++++++++++
 .github/workflows/test.yml  | 21 +++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/.github/workflows/gofmt.yml b/.github/workflows/gofmt.yml
index a5294a3..bada507 100644
--- a/.github/workflows/gofmt.yml
+++ b/.github/workflows/gofmt.yml
@@ -4,6 +4,9 @@ on:
     branches:
       - master
   pull_request:
+    paths:
+      - '.github/workflows/gofmt.yml'
+      - '**.go'
 jobs:
 
   gofmt:
diff --git a/.github/workflows/smoke.yml b/.github/workflows/smoke.yml
index 55a5a2a..eb883c5 100644
--- a/.github/workflows/smoke.yml
+++ b/.github/workflows/smoke.yml
@@ -4,6 +4,13 @@ on:
     branches:
       - master
   pull_request:
+    paths:
+      - '.github/workflows/smoke**'
+      - '**Makefile'
+      - '**.go'
+      - '**.proto'
+      - 'go.mod'
+      - 'go.sum'
 jobs:
 
   smoke:
@@ -20,6 +27,13 @@ jobs:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v1
 
+    - uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: build
       run: make
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 78d4220..fb8d0ec 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -4,6 +4,13 @@ on:
     branches:
       - master
   pull_request:
+    paths:
+      - '.github/workflows/test.yml'
+      - '**Makefile'
+      - '**.go'
+      - '**.proto'
+      - 'go.mod'
+      - 'go.sum'
 jobs:
 
   test-linux:
@@ -20,6 +27,13 @@ jobs:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v1
 
+    - uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: Build
       run: make all
 
@@ -43,6 +57,13 @@ jobs:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v1
 
+    - uses: actions/cache@v1
+      with:
+        path: ~/go/pkg/mod
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: |
+          ${{ runner.os }}-go-
+
     - name: Build nebula
       run: go build ./cmd/nebula