makefile: Add whitespace check

Signed-off-by: Or Shoval <oshoval@redhat.com>

.github/workflows/check.yaml

@@ -38,3 +38,10 @@ jobs:
       uses: actions/checkout@v2
     - name: Run unit tests
       run: make test
+  whitespace-check:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v2
+    - name: Run whitespace check
+      run: make whitespace-check

Makefile

@@ -67,6 +67,12 @@ create-nodeport:
 bump-kubevirtci:
 	./hack/bump-kubevirtci.sh
 
+whitespace:
+	./hack/whitespace.sh --fix
+
+whitespace-check:
+	./hack/whitespace.sh
+
 vendor: $(GO)
 	$(GO) mod tidy
 	$(GO) mod vendor
@@ -86,5 +92,7 @@ vendor: $(GO)
 	cluster-clean \
 	create-nodeport \
 	bump-kubevirtci \
+	whitespace \
+	whitespace-check \
 	vendor
 

hack/whitespace.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -e
+
+function fix() {
+    git ls-files -- ':!vendor/' | xargs sed --follow-symlinks -i 's/[[:space:]]*$//'
+}
+
+function check() {
+    invalid_files=$(git ls-files -- ':!vendor/' | xargs egrep -Hn " +$" || true)
+    if [[ $invalid_files ]]; then
+        echo 'Found trailing whitespaces. Please remove trailing whitespaces using `make fmt`:'
+        echo "$invalid_files"
+        return 1
+    fi
+}
+
+if [ "$1" == "--fix" ]; then
+    fix
+else
+    check
+fi
+