chore(#57): add new stage for go fmt check (#64)

.travis.yml

@@ -9,5 +9,9 @@ git:
   depth: 1
   go_import_path: github.com/Clusterlab/ha_cluster_exporter
 
-script:
-  - make 
+jobs:
+  include:
+    - stage: Go fmt
+    - script: ./go_lint.sh
+    - stage: Build
+    - script: make

go_lint.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+# NOTE: This script needs be run from the root of the GD2 repository
+
+# Find all Go source files in the repository, that are not vendored or generated
+# and then run gofmt on them
+GOFMT_FILE_LIST=$(gofmt -l . | grep -v vendor)
+if [ -n "${GOFMT_FILE_LIST}" ]; then
+  printf >&2 'gofmt failed for the following files:\n%s\n\nplease run "gofmt -w ." on your changes before committing.\n' "${GOFMT_FILE_LIST}"
+  exit 1
+fi