Add appengine/gcloud/mustache dependencies.

pkg/appengine/test/dart-python--datastore-compatibility/tools/utils.sh

+#!/bin/bash
+
+function start_phase {
+  echo "==============================================="
+  echo "= Phase: $1"
+  echo "==============================================="
+}
+
+function error {
+  echo "==============================================="
+  echo "= Error: $1"
+  echo "==============================================="
+}
+
+function die {
+  echo "$1"
+  exit 1
+}
+
+function check_env_variable {
+  NAME="$1"
+  env | grep "$NAME" &> /dev/null
+  if [ $? -ne 0 ]; then
+    die "Couldn't find environment variable '$NAME'!"
+  fi
+}
+
+function analyze_file {
+  echo "Analyzing file '$1'."
+  # Hack because dartanalyzer doesn't look into packages/ directory next to
+  # entry point (if pacakges are nested).
+  PACKAGE_ROOT="$(dirname $1)/packages"
+
+  "$DART_SDK/bin/dartanalyzer" "--package-root=$PACKAGE_ROOT" --fatal-warnings "$1"
+  if [ $? -ne 0 ]; then
+    error "Analyzer failed on file '$1'."
+    return 1
+  fi
+  return 0
+}
+
+function test_file {
+  echo "Testing file '$1'."
+  "$DART_SDK/bin/dart" --checked "$@"
+  if [ $? -ne 0 ]; then
+    error "Running tests in '$1' failed."
+    return 1
+  fi
+  return 0
+}
+