Fix travis kyaml exit and targets

- properly exit non-0 if there are any uncommitted files
- make functions/examples targes
- add missing licenses
- refactor into loop

travis/kyaml-pre-commit.sh

@@ -1,16 +1,21 @@
 #!/bin/bash
+# Copyright 2019 The Kubernetes Authors.
+# SPDX-License-Identifier: Apache-2.0
+
 set -e
 
-cd kyaml
-make all
-
-cd ../cmd/config
-make all
-
-cd ../kubectl
-make all
+# run all tests for kyaml and related commands
+targets="kyaml cmd/config cmd/kubectl functions/examples/injection-tshirt-sizes functions/examples/template-go-nginx functions/examples/template-heredoc-cockroachdb functions/examples/validator-kubeval functions/examples/validator-resource-requests"
+for target in $targets; do
+  pushd .
+  cd $target
+  make all
+  popd
+done
 
 # make sure no files were generated or changed by make
-cd ../..
+# ignore changes to go.mod and go.sum -- they are too flaky
+find . -name go.mod | xargs git checkout --
+find . -name go.sum | xargs git checkout --
 git add .
-git diff-index HEAD --
+git diff-index HEAD --exit-code