From 371c8b8a1ca7d0a4799fecc8b8c70ea2df1f7383 Mon Sep 17 00:00:00 2001
From: Igor Minar <igor@angularjs.org>
Date: Wed, 15 Apr 2015 21:32:39 -0700
Subject: [PATCH] chore(travis): add npm/install-dependencies.sh step in
 preparation for caching

---
 .travis.yml                       | 10 ++++++++++
 tools/npm/install-dependencies.sh | 16 ++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100755 tools/npm/install-dependencies.sh

diff --git a/.travis.yml b/.travis.yml
index d2d63b591b..162cb0b10d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,12 +28,22 @@ before_install:
 - ./scripts/ci/install_dart.sh ${DART_CHANNEL} ${ARCH}
 - sh -e /etc/init.d/xvfb start
 - if [[ -e SKIP_TRAVIS_TESTS ]]; then { cat SKIP_TRAVIS_TESTS ; exit 0; } fi
+
+install:
+  # Check the size of caches
+  - du -sh ./node_modules || true
+  # Install npm dependecies and ensure that npm cache is not stale
+  - tools/npm/install-dependencies.sh
+
 before_script:
 - mkdir -p $LOGS_DIR
+
 script:
 - ./scripts/ci/build_and_test.sh ${MODE}
+
 after_script:
 - ./scripts/ci/print-logs.sh
+
 notifications:
   webhooks:
     urls:
diff --git a/tools/npm/install-dependencies.sh b/tools/npm/install-dependencies.sh
new file mode 100755
index 0000000000..1851d4ea6a
--- /dev/null
+++ b/tools/npm/install-dependencies.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -e
+
+SHRINKWRAP_FILE=npm-shrinkwrap.json
+SHRINKWRAP_CACHED_FILE=node_modules/npm-shrinkwrap.cached.json
+
+if diff -q $SHRINKWRAP_FILE $SHRINKWRAP_CACHED_FILE; then
+  echo 'No shrinkwrap changes detected. npm install will be skipped...';
+else
+  echo 'Blowing away node_modules and reinstalling npm dependencies...'
+  rm -rf node_modules
+  npm install
+  cp $SHRINKWRAP_FILE $SHRINKWRAP_CACHED_FILE
+  echo 'npm install successful!'
+fi