Add a version consistency check

MODULE.bazel

@@ -14,8 +14,19 @@ bazel_dep(name = "platforms", version = "0.0.4")
 ### INTERNAL ONLY - lines after this are not included in the release packaging.
 
 # Gazelle extension is experimental
-bazel_dep(name = "rules_go", repo_name = "io_bazel_rules_go", version = "0.33.0")
-bazel_dep(name = "gazelle", repo_name = "bazel_gazelle", version = "0.26.0")
+# Note that io_bazel_rules_go 0.34.0 is currently (2022-09-12) a continuously
+# updated version (i.e. >= 0.35.0 in reality), which is what we need for
+# buildools. See https://github.com/bazelbuild/bazel-skylib/issues/386#issuecomment-1243958234
+bazel_dep(name = "rules_go", repo_name = "io_bazel_rules_go", version = "0.34.0")
+
+# We need https://github.com/bazelbuild/bazel-gazelle/pull/1331 for buildtools
+bazel_dep(name = "gazelle", repo_name = "bazel_gazelle", version = "0.27.0-pre")
+
+git_override(
+    commit = "55ba8e3f2aaad0f43d82d02eba90ccf7a7fe9c73",
+    module_name = "gazelle",
+    remote = "https://github.com/bazelbuild/bazel-gazelle",
+)
 
 go_deps = use_extension("@bazel_gazelle//:extensions.bzl", "go_deps")
 

WORKSPACE

@@ -6,18 +6,18 @@ load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
 maybe(
     name = "io_bazel_rules_go",
     repo_rule = http_archive,
-    sha256 = "685052b498b6ddfe562ca7a97736741d87916fe536623afb7da2824c0211c369",
+    sha256 = "099a9fb96a376ccbbb7d291ed4ecbdfd42f6bc822ab77ae6f1b5cb9e914e94fa",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.33.0/rules_go-v0.33.0.zip",
-        "https://github.com/bazelbuild/rules_go/releases/download/v0.33.0/rules_go-v0.33.0.zip",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.35.0/rules_go-v0.35.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.35.0/rules_go-v0.35.0.zip",
     ],
 )
 
 load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
 
 go_rules_dependencies()
 
-go_register_toolchains(version = "1.17.1")
+go_register_toolchains(version = "1.19.1")
 
 # Below this line is for documentation generation only,
 # and should thus not be included by dependencies on
@@ -80,6 +80,28 @@ http_archive(
 # Another Gazelle repository hint.
 # gazelle:repository go_repository name=bazel_gazelle importpath=github.com/bazelbuild/bazel-gazelle/testtools
 
-load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")
+load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")
 
 gazelle_dependencies()
+
+# Buildozer & deps
+http_archive(
+    name = "com_google_protobuf",
+    sha256 = "4dd35e788944b7686aac898f77df4e9a54da0ca694b8801bd6b2a9ffc1b3085e",
+    strip_prefix = "protobuf-3.19.2",
+    urls = [
+        "https://github.com/protocolbuffers/protobuf/archive/v3.19.2.tar.gz",
+    ],
+)
+
+load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
+
+protobuf_deps()
+
+go_repository(
+    name = "com_github_bazelbuild_buildtools",
+    build_naming_convention = "go_default_library",
+    importpath = "github.com/bazelbuild/buildtools",
+    sum = "h1:fmdo+fvvWlhldUcqkhAMpKndSxMN3vH5l7yow5cEaiQ=",
+    version = "v0.0.0-20220531122519-a43aed7014c8",
+)

tests/BUILD

@@ -1,4 +1,5 @@
 load("//:bzl_library.bzl", "bzl_library")
+load("//rules:diff_test.bzl", "diff_test")
 load(":build_test_tests.bzl", "build_test_test_suite")
 load(":collections_tests.bzl", "collections_test_suite")
 load(":dicts_tests.bzl", "dicts_test_suite")
@@ -100,3 +101,25 @@ sh_test(
     name = "shell_spawn_e2e_test",
     srcs = [":shell_spawn_e2e_test_src"],
 )
+
+genrule(
+    name = "version_from_module.bazel",
+    srcs = ["//:MODULE.bazel"],
+    outs = ["version_from_module.bazel.out"],
+    cmd = "cat '$<' | $(location @com_github_bazelbuild_buildtools//buildozer) 'print version' '-:bazel_skylib' > '$@'",
+    tools = ["@com_github_bazelbuild_buildtools//buildozer"],
+)
+
+genrule(
+    name = "version_from_version.bzl",
+    srcs = ["//:version.bzl"],
+    outs = ["version_from_version.bzl.out"],
+    cmd = "sed -n 's/ *version = \"\\(.*\\)\"/\\1/p' '$<' > '$@'",
+)
+
+diff_test(
+    name = "bazel_skylib_version_consistency_test",
+    failure_message = "The values of 'version' in version.bzl and MODULE.bazel do not match",
+    file1 = ":version_from_module.bazel",
+    file2 = ":version_from_version.bzl",
+)