Update .travis.yml for minor things

.travis.yml

@@ -1,6 +1,10 @@
 dist: trusty
 sudo: off
 
+branches:
+  only:
+  - master
+
 language: node_js # Base language is Nodejs (used for liniting and basic validation).
 
 addons:
@@ -24,32 +28,38 @@ cache:
 script: # Run the lint tests, then if env vars are present validate the template then try building the stack.
   - npm test
   - if [ "$SPNAME" != ""  -a  "$SPPASSWORD" != ""  -a  "$SPTENANT" != ""  -a  "$SPSSHKEY" != "" ]; then
-      export RUNBUILD="true";
+      export RUNBUILD="true"
+      export AZMDLGROUP="azmdl-travis-$TRAVIS_BUILD_NUMBER"
     fi
-  - if [ "$LOCATION" == "" ]; then
-      export LOCATION="westus";
+  - if [ -z "$LOCATION" ]; then
+      export LOCATION="westus"
     fi
-  - if [ "$RUNBUILD" == "true" ]; then
-      echo "Running Azure setup steps.";
-      az login --service-principal -u "$SPNAME" -p "$SPPASSWORD" --tenant "$SPTENANT";
-      az group create -l "$LOCATION" -g "moodle-azure-$TRAVIS_BUILD_NUMBER";
+  - if [ "$RUNBUILD" = "true" ]; then
+      echo "Running Azure setup steps."
+      az login --service-principal -u "$SPNAME" -p "$SPPASSWORD" --tenant "$SPTENANT"
+      az group create -l "$LOCATION" -g "$AZMDLGROUP"
     else
-      echo "Skipping Azure setup.";
+      echo "Skipping Azure setup."
     fi
-  - if [ "$RUNBUILD" == "true" ]; then
-      echo "Running Azure validation step.";
-      az group deployment validate --resource-group "moodle-azure-$TRAVIS_BUILD_NUMBER" --template-file azuredeploy.json --parameters azuredeploy.parameters.json --parameters sshPublicKey="$SPSSHKEY";
+  - if [ "$RUNBUILD" = "true" ]; then
+      echo "Running Azure validation step."
+      VALIDATION_RESULT=$(az group deployment validate --resource-group "$AZMDLGROUP" --template-file azuredeploy.json --parameters azuredeploy.parameters.json --parameters sshPublicKey="$SPSSHKEY")
+      if [ -n "$VALIDATION_RESULT" ]; then
+        echo "Azure template validation failed! Error message:"
+        echo $VALIDATION_RESULT
+        exit 1
+      fi
     else
-      echo "Skipping Azure validation.";
+      echo "Skipping Azure validation."
     fi
-  - if [ "$RUNBUILD" == "true" ]; then
-      echo "Running Azure build step.";
-      az group deployment create --resource-group "moodle-azure-$TRAVIS_BUILD_NUMBER" --template-file azuredeploy.json --parameters azuredeploy.parameters.json --parameters sshPublicKey="$SPSSHKEY" --debug --verbose;
+  - if [ "$RUNBUILD" = "true" ]; then
+      echo "Running Azure build step."
+      az group deployment create --resource-group "$AZMDLGROUP" --template-file azuredeploy.json --parameters azuredeploy.parameters.json --parameters sshPublicKey="$SPSSHKEY" --debug --verbose
     else
-      echo "Skipping Azure build.";
+      echo "Skipping Azure build."
     fi
 
 after_script: # Teardown group and created resource after build.
-  - if [ "$RUNBUILD" == "true" ]; then
-      az group delete -g "moodle-azure-$TRAVIS_BUILD_NUMBER" -y;
+  - if [ "$RUNBUILD" = "true" ]; then
+      az group delete -g "moodle-azure-$TRAVIS_BUILD_NUMBER" -y --no-wait
     fi