Go mod tidy (#6264)

* updates go.sum
* go mod tidy checker
* reverts go.sum
* updates apk command
* fixes path
* show git status
* more debug info
* more debug info
* minor test
* get rid of git
* multiple checks
* test reset
* change order of checkers
* mod verify
* broken sum
* Merge refs/heads/master into go-mod-tidy
* better info
* Merge branch 'go-mod-tidy' of github.com:prysmaticlabs/prysm into go-mod-tidy
* better info
* reset
* run go mod tidy to fix

.github/actions/gomodtidy/Dockerfile

@@ -0,0 +1,5 @@
+FROM golang:alpine
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/gomodtidy/action.yml

@@ -0,0 +1,5 @@
+name: 'Go mod tidy checker'
+description: 'Checks that `go mod tidy` has been applied.'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/gomodtidy/entrypoint.sh

@@ -0,0 +1,34 @@
+#!/bin/sh -l
+set -e
+export PATH=$PATH:/usr/local/go/bin
+
+cd $GITHUB_WORKSPACE
+
+cp go.mod go.mod.orig
+cp go.sum go.sum.orig
+
+go mod tidy
+
+echo "Checking go.mod and go.sum:"
+checks=0
+if [ "$(diff -s go.mod.orig go.mod | grep -c 'Files go.mod.orig and go.mod are identical')" = 1 ]; then
+  echo "- go.mod is up to date."
+  checks=$((checks + 1))
+else
+  echo "- go.mod is NOT up to date."
+fi
+
+if [ "$(diff -s go.sum.orig go.sum | grep -c 'Files go.sum.orig and go.sum are identical')" = 1 ]; then
+  echo "- go.sum is up to date."
+  checks=$((checks + 1))
+else
+  echo "- go.sum is NOT up to date."
+fi
+
+if [ $checks -eq 2 ]; then
+  exit 0
+fi
+
+# Notify of any issues.
+echo "Run 'go mod tidy' to update."
+exit 1

.github/workflows/go.yml

@@ -15,6 +15,10 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v1
 
+      - name: Go mod tidy checker
+        id: gomodtidy
+        uses: ./.github/actions/gomodtidy
+
       - name: Gofmt checker
         id: gofmt
         uses: ./.github/actions/gofmt