Only run gospace tidy when go.mod or go.sum change (#1214)

.travis.yml

@@ -62,7 +62,7 @@ matrix:
         - go run ./scripts/check-imports.go ./...
         - go run ./scripts/protobuf.go --protoc=$HOME/protoc/bin/protoc lint
         - golangci-lint run
-        - gospace istidy
+        - ./scripts/check-travis-tidy.sh
 
     ### integration tests ###
     - env: MODE=integration

scripts/check-travis-tidy.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -ueo pipefail
+
+CHANGES=$(git diff --name-only $TRAVIS_COMMIT_RANGE -- go.mod go.sum)
+
+if [ -z "$CHANGES" ]
+then
+    echo "go modules not changed"
+else
+    echo "go module changes detected"
+    gospace tidy
+fi