Add bzlmod support

This commit adds support for bzlmod.
See the MODULE.bazel for changes and enable with `--enable_bzlmod`.

.bazelrc

@@ -1,3 +1,7 @@
+# Enable Bzlmod
+# TODO: While supporting Bazel 5 we need to keep experimental flag vs using "--enable_bzlmod"
+common --experimental_enable_bzlmod
+
 # We can't create a bzl_library for rules-swift because of its visibility,
 # so circumvent by not using the sandbox
 build --strategy=Stardoc=standalone

.github/workflows/tests.yml

@@ -93,8 +93,9 @@ jobs:
         run: .github/workflows/xcode_select.sh
       - name: Build and Test
         run: |
-          # iOS tests
+          # iOS tests without bzlmod on Bazel 5
           bazelisk build \
+            --noexperimental_enable_bzlmod \
             --config=ci \
             --config=ios \
             --config=vfs \
@@ -155,8 +156,10 @@ jobs:
           git diff --exit-code
       - name: Check docs
         run: |
+          # TODO: stardoc doesn't currently support bzlmod: https://github.com/bazelbuild/stardoc/issues/117
           bazelisk run \
             --config=ci \
+            --noexperimental_enable_bzlmod \
             //docs
           git diff --exit-code docs
 

BUILD.bazel

@@ -3,13 +3,15 @@
 load("@build_bazel_rules_swift//swift/internal:feature_names.bzl", "SWIFT_FEATURE_USE_GLOBAL_INDEX_STORE")
 load("//rules:features.bzl", "feature_names")
 load("@bazel_skylib//lib:selects.bzl", "selects")
+load("@buildifier_prebuilt//:rules.bzl", "buildifier")
 
-sh_binary(
+buildifier(
     name = "buildifier",
-    srcs = select({
-        "@bazel_tools//src/conditions:darwin_x86_64": ["@buildifier.mac.amd64//file"],
-        "@bazel_tools//src/conditions:darwin_arm64": ["@buildifier.mac.arm64//file"],
-    }),
+    exclude_patterns = [
+        "./.git/*",
+        "./bazel-*/*",
+    ],
+    mode = "fix",
 )
 
 config_setting(

MODULE.bazel

@@ -0,0 +1,118 @@
+"""
+Defines all the external repositories and dependencies for rules_ios.
+"""
+
+# Defines the rules_ios bzlmod module
+# TODO: The `version` needs to be updated between releases
+module(
+    name = "rules_ios",
+    version = "1.0.1",
+    bazel_compatibility = [">=5.0.0"],
+    compatibility_level = 1,
+    repo_name = "build_bazel_rules_ios",
+)
+
+# Declare the bzlmod dependencies needed by rules_ios and users of rules_ios
+bazel_dep(
+    name = "apple_support",
+    version = "1.6.0",
+    repo_name = "build_bazel_apple_support",
+)
+bazel_dep(
+    name = "rules_apple",
+    version = "2.3.0",
+    repo_name = "build_bazel_rules_apple",
+)
+bazel_dep(
+    name = "rules_cc",
+    version = "0.0.6",
+)
+bazel_dep(
+    name = "rules_python",
+    version = "0.21.0",
+)
+bazel_dep(
+    name = "rules_swift",
+    version = "1.8.0",
+    repo_name = "build_bazel_rules_swift",
+)
+
+# Declare the development dependencies needed for rules_ios development
+bazel_dep(
+    name = "buildifier_prebuilt",
+    version = "6.1.0",
+    dev_dependency = True,
+)
+bazel_dep(
+    name = "rules_pkg",
+    version = "0.9.1",
+    dev_dependency = True,
+)
+bazel_dep(
+    name = "bazel_skylib",
+    version = "1.4.1",
+    dev_dependency = True,
+)
+
+# Load non-bzlmod dependencies from rules_ios
+non_module_deps = use_extension("//rules:module_extensions.bzl", "non_module_deps")
+use_repo(
+    non_module_deps,
+    "com_github_yonaskolb_xcodegen",
+    "xchammer",
+)
+
+non_module_dev_deps = use_extension(
+    "//rules:module_extensions.bzl",
+    "non_module_dev_deps",
+    dev_dependency = True,
+)
+use_repo(
+    non_module_dev_deps,
+    "GoogleMobileAdsSDK",
+    "TensorFlowLiteC",
+    "arm64-to-sim",
+    "com_github_apple_swiftcollections",
+    "tart",
+)
+
+# Configure Xcode
+xcode_configure = use_extension(
+    "//rules:module_extensions.bzl",
+    "xcode_configure",
+    dev_dependency = True,
+)
+xcode_configure.configure(
+    remote_xcode_label = "",
+    xcode_locator_label = "//tools/toolchains/xcode_configure:xcode_locator.m",
+)
+
+# Load non-bzlmod dependencies used in this repo from rules_swift
+swift_non_module_deps = use_extension("@build_bazel_rules_swift//swift:extensions.bzl", "non_module_deps")
+use_repo(
+    swift_non_module_deps,
+    "build_bazel_rules_swift_index_import",
+    "build_bazel_rules_swift_local_config",
+)
+
+# Load non-bzlmod dependencies used in this repo from rules_apple
+apple_non_module_deps = use_extension("@build_bazel_rules_apple//apple:extensions.bzl", "non_module_deps")
+use_repo(
+    apple_non_module_deps,
+    "xctestrunner",
+)
+
+# Register the Python toolchain
+python = use_extension("@rules_python//python:extensions.bzl", "python")
+python.toolchain(
+    name = "python3_9",
+    python_version = "3.9",
+)
+use_repo(
+    python,
+    "python3_9_toolchains",
+)
+
+register_toolchains(
+    "@python3_9_toolchains//:all",
+)

WORKSPACE

@@ -1,12 +1,20 @@
+# This file marks the root of the Bazel workspace.
+# See MODULE.bazel for dependencies and setup.
+# It is only used when bzlmod is disabled.
+# When bzlmod is enabled WORKSPACE.bzlmod is used.
+
 workspace(name = "build_bazel_rules_ios")
 
 load(
     "//rules:repositories.bzl",
     "rules_ios_dependencies",
+    "rules_ios_dev_dependencies",
 )
 
 rules_ios_dependencies(load_xchammer_dependencies = True)
 
+rules_ios_dev_dependencies()
+
 load(
     "@build_bazel_rules_apple//apple:repositories.bzl",
     "apple_rules_dependencies",
@@ -55,25 +63,14 @@ load("@io_bazel_stardoc//:setup.bzl", "stardoc_repositories")
 
 stardoc_repositories()
 
-load(
-    "@bazel_tools//tools/build_defs/repo:http.bzl",
-    "http_file",
-)
+# Download prebuilt binaries buildifier
+load("@buildifier_prebuilt//:deps.bzl", "buildifier_prebuilt_deps")
 
-# Download offical release of buildifier.mac
-http_file(
-    name = "buildifier.mac.amd64",
-    executable = True,
-    sha256 = "c9378d9f4293fc38ec54a08fbc74e7a9d28914dae6891334401e59f38f6e65dc",
-    urls = ["https://github.com/bazelbuild/buildtools/releases/download/5.1.0/buildifier-darwin-amd64"],
-)
+buildifier_prebuilt_deps()
 
-http_file(
-    name = "buildifier.mac.arm64",
-    executable = True,
-    sha256 = "745feb5ea96cb6ff39a76b2821c57591fd70b528325562486d47b5d08900e2e4",
-    urls = ["https://github.com/bazelbuild/buildtools/releases/download/5.1.0/buildifier-darwin-arm64"],
-)
+load("@buildifier_prebuilt//:defs.bzl", "buildifier_prebuilt_register_toolchains")
+
+buildifier_prebuilt_register_toolchains()
 
 load(
     "//tests/ios/frameworks/external-dependency:external_dependency.bzl",

WORKSPACE.bzlmod

@@ -0,0 +1,27 @@
+# This file marks the root of the Bazel workspace.
+# See MODULE.bazel for dependencies and setup.
+# It is only used when bzlmod is enabled.
+# This file will generally be kept empty in favor of using MODULE.bazel fully.
+
+workspace(name = "build_bazel_rules_ios")
+
+# TODO: stardoc doesn't currently support bzlmod: https://github.com/bazelbuild/stardoc/issues/117
+# Once that closes we should depend on it via the WORKSPACE file.
+# In the meantime, this is a workaround to at least allow building.
+# Note however that updating docs with bzlmod will not work until the above is resolved.
+# Until then use: --noenable_bzlmod
+load(
+    "@bazel_tools//tools/build_defs/repo:git.bzl",
+    "git_repository",
+)
+
+git_repository(
+    name = "io_bazel_stardoc",
+    commit = "6f274e903009158504a9d9130d7f7d5f3e9421ed",
+    remote = "https://github.com/bazelbuild/stardoc.git",
+    shallow_since = "1667581897 -0400",
+)
+
+load("@io_bazel_stardoc//:setup.bzl", "stardoc_repositories")
+
+stardoc_repositories()

rules/module_extensions.bzl

@@ -0,0 +1,44 @@
+"""Definitions for bzlmod module extensions."""
+
+load(
+    "//rules:repositories.bzl",
+    "rules_ios_dependencies",
+    "rules_ios_dev_dependencies",
+)
+load(
+    "//tools/toolchains/xcode_configure:xcode_configure.bzl",
+    _xcode_configure = "xcode_configure",
+)
+
+def _non_module_deps_impl(_):
+    rules_ios_dependencies(
+        load_xchammer_dependencies = True,
+        load_bzlmod_dependencies = False,
+    )
+
+non_module_deps = module_extension(implementation = _non_module_deps_impl)
+
+def _non_module_dev_deps_impl(_):
+    rules_ios_dev_dependencies(load_bzlmod_dependencies = False)
+
+non_module_dev_deps = module_extension(implementation = _non_module_dev_deps_impl)
+
+def _xcode_configure_impl(module_ctx):
+    for mod in module_ctx.modules:
+        for xcode_configure_attr in mod.tags.configure:
+            _xcode_configure(
+                remote_xcode_label = xcode_configure_attr.remote_xcode_label,
+                xcode_locator_label = xcode_configure_attr.xcode_locator_label,
+            )
+
+xcode_configure = module_extension(
+    implementation = _xcode_configure_impl,
+    tag_classes = {
+        "configure": tag_class(
+            attrs = {
+                "remote_xcode_label": attr.string(mandatory = True),
+                "xcode_locator_label": attr.string(mandatory = True),
+            },
+        ),
+    },
+)