Get android path from env (fixes bazelbuild#746)

--
Change-Id: Ideb2011d23da470276420afcc8b5a71f1470f391
Reviewed-on: https://bazel-review.googlesource.com/#/c/2771
MOS_MIGRATED_REVID=113639747

.gitignore

@@ -5,6 +5,7 @@
 /.idea/
 /.project
 /.settings
+/WORKSPACE.user.bzl
 /base_workspace/*
 /bazel-bazel
 /bazel-bin

WORKSPACE

@@ -12,37 +12,10 @@ jsonnet_repositories()
 rust_repositories()
 sass_repositories()
 
-# In order to run the Android integration tests, uncomment these rules, point
-# them to the Android NDK and the SDK, and point the bind rules under them
-# to @repository//:files .
-# android_sdk_repository(
-#     name = "androidsdk",
-#     path = "/path/to/sdk",
-#     # Available versions are under /path/to/sdk/build-tools/.
-#     build_tools_version = "21.1.1",
-#     # Available versions are under /path/to/sdk/platforms/.
-#     api_level = 19,
-# )
-
-# android_ndk_repository(
-#     name = "androidndk",
-#     path = "/path/to/ndk",
-#     api_level = 19,  # Set this to the SDK's api_level.
-# )
-
-bind(
-    name = "android_sdk_for_testing",
-    # Uncomment and delete the //:dummy line to run integration tests.
-    #   actual = "@androidsdk//:files",
-    actual = "//:dummy",
-)
-
-bind(
-    name = "android_ndk_for_testing",
-    # Uncomment and delete the //:dummy line to run integration tests.
-    #   actual = "@androidndk//:files",
-    actual = "//:dummy",
-)
+# In order to run the Android integration tests, run
+# scripts/workspace_user.sh and uncomment the next two lines.
+# load("/WORKSPACE.user", "android_repositories")
+# android_repositories()
 
 # only used for the scala rule
 new_http_archive(

scripts/workspace_user.sh

@@ -0,0 +1,76 @@
+#! /usr/bin/env bash
+#
+# Copyright 2016 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script locates the android sdk (via ANDROID_HOME) and ndk
+# (via ANDROID_NDK) on your system, and writes a WORKSPACE.user.bzl
+# that points to them.
+
+set -euo pipefail
+
+while [ ! -f WORKSPACE ]; do
+  cd ..
+  if [ "/" = $(pwd) ]
+  then
+    echo "WORKSPACE not found." 1>&2
+    exit 1
+  fi
+done
+
+: ${ANDROID_BUILD_TOOLS_VERSION:="21.1.1"}
+: ${ANDROID_API_LEVEL:="19"}
+
+if [ -n "${ANDROID_HOME:-}" ]; then
+  cat <<EOF >WORKSPACE.user.bzl
+def android_sdk():
+  native.android_sdk_repository(
+    name = "androidsdk",
+    path = "${ANDROID_HOME}",
+    # Available versions are under /path/to/sdk/build-tools/.
+    build_tools_version = "${ANDROID_BUILD_TOOLS_VERSION}",
+    # Available versions are under /path/to/sdk/platforms/.
+    api_level = ${ANDROID_API_LEVEL},
+  )
+  native.bind(name = "android_sdk_for_testing", actual = "@androidsdk//:files")
+EOF
+else
+    cat <<EOF >WORKSPACE.user.bzl
+def android_sdk():
+    native.bind(name = "android_sdk_for_testing", actual = "//:dummy")
+EOF
+fi
+
+if [ -n "${ANDROID_NDK:-}" ]; then
+  cat <<EOF >>WORKSPACE.user.bzl
+def android_ndk():
+  native.android_ndk_repository(
+    name = "androidndk",
+    path = "${ANDROID_NDK}",
+    api_level = ${ANDROID_API_LEVEL},
+  )
+  native.bind(name = "android_ndk_for_testing", actual = "@androidndk//:files")
+EOF
+else
+  cat <<EOF >>WORKSPACE.user.bzl
+def android_ndk():
+    native.bind(name = "android_ndk_for_testing", actual = "//:dummy")
+EOF
+fi
+
+cat <<EOF >>WORKSPACE.user.bzl
+def android_repositories():
+  android_sdk()
+  android_ndk()
+EOF