From dbee5c01e9859d9fa56942ab57be53aaa8931f45 Mon Sep 17 00:00:00 2001
From: Adam Barth <abarth@chromium.org>
Date: Thu, 5 Nov 2015 00:20:03 -0800
Subject: [PATCH] Add a bash script for bootstrapping flutter_tools

---
 bin/cache/.gitignore |  2 ++
 bin/cache/README.md  |  3 +++
 bin/flutter          | 36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 bin/cache/.gitignore
 create mode 100644 bin/cache/README.md
 create mode 100755 bin/flutter

diff --git a/bin/cache/.gitignore b/bin/cache/.gitignore
new file mode 100644
index 00000000000..a46a10366c5
--- /dev/null
+++ b/bin/cache/.gitignore
@@ -0,0 +1,2 @@
+*.snapshot
+*.stamp
diff --git a/bin/cache/README.md b/bin/cache/README.md
new file mode 100644
index 00000000000..c7f88be9370
--- /dev/null
+++ b/bin/cache/README.md
@@ -0,0 +1,3 @@
+# Binary cache
+
+This directory contains a cache of binary artifacts used by the Flutter tools.
diff --git a/bin/flutter b/bin/flutter
new file mode 100755
index 00000000000..6a4667fd60c
--- /dev/null
+++ b/bin/flutter
@@ -0,0 +1,36 @@
+#!/bin/bash
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+FLUTTER_ROOT=$(dirname $(dirname "${BASH_SOURCE[0]}"))
+FLUTTER_TOOLS_DIR="$FLUTTER_ROOT/packages/flutter_tools"
+SNAPSHOT_PATH="$FLUTTER_ROOT/bin/cache/flutter_tools.snapshot"
+STAMP_PATH="$FLUTTER_ROOT/bin/cache/flutter_tools.stamp"
+SCRIPT_PATH="$FLUTTER_TOOLS_DIR/bin/sky_tools.dart"
+
+# TODO(abarth): We shouldn't require dart to be on the user's path.
+DART=dart
+
+if [ "$FLUTTER_TOOLS_DIR/pubspec.yaml" -nt "$FLUTTER_TOOLS_DIR/pubspec.lock" ]; then
+  (cd "$FLUTTER_TOOLS_DIR"; pub get)
+fi
+
+REVISION=`(cd "$FLUTTER_ROOT"; git rev-parse HEAD)`
+
+if [ ! -f "$SNAPSHOT_PATH" ] || [ ! -f "$STAMP_PATH" ] || [ `cat "$STAMP_PATH"` != $REVISION ]; then
+  DART --snapshot="$SNAPSHOT_PATH" --package-root="$FLUTTER_TOOLS_DIR/packages" "$SCRIPT_PATH"
+  echo -n $REVISION > "$STAMP_PATH"
+fi
+
+DART "$SNAPSHOT_PATH" "$@"
+
+# The VM exits with code 253 if the snapshot version is out-of-date.
+# If it is, we need to snapshot it again.
+EXIT_CODE=$?
+if [ $EXIT_CODE != 253 ]; then
+  exit $EXIT_CODE
+fi
+
+DART --snapshot="$SNAPSHOT_PATH" --package-root="$FLUTTER_TOOLS_DIR/packages" "$SCRIPT_PATH"
+DART "$SNAPSHOT_PATH" "$@"