Implement android_sdk_repository in Starlark.

Fixes #76.

PiperOrigin-RevId: 563532977
Change-Id: I1a17d21984429bf426c9ff3f8ba7cdab337c8529

android/rules.bzl

@@ -53,7 +53,7 @@ load(
     _android_sdk = "android_sdk",
 )
 load(
-    "//rules:android_sdk_repository.bzl",
+    "//rules/android_sdk_repository:rule.bzl",
     _android_sdk_repository = "android_sdk_repository",
 )
 load(

rules/BUILD

@@ -69,7 +69,6 @@ bzl_library(
     srcs = [
         "android_ndk_repository.bzl",
         "android_sdk.bzl",
-        "android_sdk_repository.bzl",
         "android_tools_defaults_jar.bzl",
         "baseline_profiles.bzl",
         "dex.bzl",
@@ -83,6 +82,7 @@ bzl_library(
         "//rules/aar_import:bzl",
         "//rules/android_library:bzl",
         "//rules/android_sandboxed_sdk:bzl",
+        "//rules/android_sdk_repository:bzl",
         "//rules/flags:bzl",
     ],
 )

rules/android_sdk_repository/BUILD

@@ -0,0 +1,18 @@
+# Description:
+#   The android_sdk_repository repository rule for using an Android SDK with Bazel.
+
+load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
+
+bzl_library(
+    name = "bzl",
+    srcs = [
+        "empty.template.bzl",
+        "helper.bzl",
+        "rule.bzl",
+        "template.bzl",
+    ],
+    visibility = ["//:__subpackages__"],
+    deps = [
+        "//rules:android_revision_bzl",
+    ],
+)

rules/android_sdk_repository/empty.template.bzl

@@ -0,0 +1,60 @@
+# Copyright 2023 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 module adds no-op repository rules when the Android SDK is not installed.
+"""
+
+package(default_visibility = ["//visibility:public"])
+
+# android_sdk_repository was used without a valid Android SDK being set.
+# Either the path attribute of android_sdk_repository or the ANDROID_HOME
+# environment variable must be set.
+# This is a minimal BUILD file to allow non-Android builds to continue.
+
+alias(
+    name = "has_androidsdk",
+    actual = "@bazel_tools//tools/android:always_false",
+)
+
+filegroup(
+    name = "files",
+    srcs = [":error_message"],
+)
+
+filegroup(
+    name = "sdk",
+    srcs = [":error_message"],
+)
+
+filegroup(
+    name = "d8_jar_import",
+    srcs = [":error_message"],
+)
+
+filegroup(
+    name = "dx_jar_import",
+    srcs = [":error_message"],
+)
+
+genrule(
+    name = "invalid_android_sdk_repository_error",
+    outs = [
+        "error_message",
+    ],
+    cmd = """echo \
+    android_sdk_repository was used without a valid Android SDK being set. \
+    Either the path attribute of android_sdk_repository or the ANDROID_HOME \
+    environment variable must be set. ; \
+    exit 1 """,
+)