feat: upgrade to bazel 9 and drop WORKSPACE mode

.bazelversion

@@ -1 +1 @@
-8.6.0
+9.0.0

.github/workflows/ci.yml

@@ -47,9 +47,6 @@ jobs:
           - ubuntu-latest
           - macos-latest
           - windows-latest
-        mode:
-          - bzlmod
-          - WORKSPACE
         exclude:
           # TruffleRuby doesn't work on Windows.
           - os: windows-latest
@@ -61,8 +58,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: bazel-contrib/setup-bazel@0.18.0
         with:
-          # Move autoload_externally to .bazelrc once Bazel 6 support is dropped.
-          bazelrc: common --announce_rc --color=yes --incompatible_autoload_externally= ${{ matrix.mode == 'WORKSPACE' && '--enable_workspace' || '' }}
+          bazelrc: common --announce_rc --color=yes
           module-root: examples/gem
           # Workaround for long path issues: https://github.com/jruby/jruby/issues/3995.
           output-base: ${{ matrix.os == 'windows-latest' && 'D:/b' || '' }}
@@ -160,8 +156,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: bazel-contrib/setup-bazel@0.18.0
         with:
-          # Move autoload_externally to .bazelrc once Bazel 6 support is dropped.
-          bazelrc: common --announce_rc --color=yes --incompatible_autoload_externally=
+          bazelrc: common --announce_rc --color=yes
           module-root: examples/deep_gem
           # Workaround for long path issues: https://github.com/jruby/jruby/issues/3995.
           output-base: ${{ matrix.os == 'windows-latest' && 'D:/b' || '' }}
@@ -193,8 +188,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: bazel-contrib/setup-bazel@0.18.0
         with:
-          # Move autoload_externally to .bazelrc once Bazel 6 support is dropped.
-          bazelrc: common --announce_rc --incompatible_autoload_externally=
+          bazelrc: common --announce_rc
           module-root: examples/rails
           repository-cache: true
       - run: echo ${{ matrix.ruby }} > .ruby-version
@@ -225,8 +219,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: bazel-contrib/setup-bazel@0.15.0
         with:
-          # Move autoload_externally to .bazelrc once Bazel 6 support is dropped.
-          bazelrc: common --announce_rc --incompatible_autoload_externally=
+          bazelrc: common --announce_rc
           module-root: examples/proto
           repository-cache: true
       - run: echo ${{ matrix.ruby }} > .ruby-version

README.md

@@ -6,7 +6,8 @@ This repository hosts [Ruby][1] language ruleset for [Bazel][2].
 
 The ruleset is known to work with:
 
-- Bazel 8 using WORKSPACE and Bzlmod _(tested on CI)_.
+- Bazel 9 using Bzlmod _(tested on CI)_.
+- Bazel 8 using WORKSPACE and Bzlmod _(no longer tested on CI)_.
 - Bazel 7 using WORKSPACE and Bzlmod _(no longer tested on CI)_.
 
 ## Getting Started
@@ -15,39 +16,6 @@ The ruleset is known to work with:
 
 The fastest way to try this in an empty project is to click the green "Use this template" button on https://github.com/bazel-starters/ruby.
 
-### WORKSPACE
-
-1. Install the ruleset following WORKSPACE instructions on the [latest release][13].
-2. Download and install Ruby:
-
-```bazel
-# WORKSPACE
-load("@rules_ruby//ruby:deps.bzl", "rb_register_toolchains")
-
-rb_register_toolchains(
-    version = "3.3.9",
-    # alternatively, load version from .ruby-version file
-    # version_file = "//:.ruby-version",
-)
-```
-
-3. _(Optional)_ Download and install Bundler dependencies:
-
-```bazel
-# WORKSPACE
-load("@rules_ruby//ruby:deps.bzl", "rb_bundle_fetch")
-
-rb_bundle_fetch(
-    name = "bundle",
-    gemfile = "//:Gemfile",
-    gemfile_lock = "//:Gemfile.lock",
-)
-```
-
-4. Start defining your library, binary and test targets in `BUILD` files.
-
-### Bzlmod
-
 1. Install ruleset following Bzlmod instructions on the [latest release][13].
 2. Download and install Ruby:
 

examples/deep_gem/.bazelrc

@@ -15,6 +15,10 @@
 startup --windows_enable_symlinks
 build --enable_runfiles
 
+# Do not autoload language-specific rules removed in Bazel core.
+# https://github.com/bazelbuild/bazel/issues/23043
+common --incompatible_autoload_externally=
+
 # Allow to run Bazel without pre-installed JDK.
 # Docs: https://bazel.build/reference/command-line-reference#flag--java_runtime_version
 build --java_runtime_version=remotejdk_21 --tool_java_runtime_version=remotejdk_21

examples/gem/.bazelrc

@@ -15,6 +15,10 @@
 startup --windows_enable_symlinks
 build --enable_runfiles
 
+# Do not autoload language-specific rules removed in Bazel core.
+# https://github.com/bazelbuild/bazel/issues/23043
+common --incompatible_autoload_externally=
+
 # Allow to run Bazel without pre-installed JDK.
 # Docs: https://bazel.build/reference/command-line-reference#flag--java_runtime_version
 build --java_runtime_version=remotejdk_21 --tool_java_runtime_version=remotejdk_21

examples/proto/.bazelrc

@@ -1,2 +1,6 @@
 common --@protobuf//bazel/toolchains:prefer_prebuilt_protoc
-common --repo_env="JAVA_HOME=../bazel_tools/jdk"
+common --repo_env="JAVA_HOME=../bazel_tools/jdk"
+
+# Do not autoload language-specific rules removed in Bazel core.
+# https://github.com/bazelbuild/bazel/issues/23043
+common --incompatible_autoload_externally=

examples/rails/.bazelrc

@@ -10,8 +10,9 @@ build --incompatible_strict_action_env=true
 # Don't allow empty glob patterns by default
 build --incompatible_disallow_empty_glob
 
-# Enable bzlmod
-common --enable_bzlmod
-
 # Download the JDK to run Bazel
 build --java_runtime_version=remotejdk_11
+
+# Do not autoload language-specific rules removed in Bazel core.
+# https://github.com/bazelbuild/bazel/issues/23043
+common --incompatible_autoload_externally=