feat: add bazel_version value to host_repo repository rule (#246)

BUILD.bazel

@@ -1,8 +1,10 @@
+load("@aspect_bazel_lib_host//:defs.bzl", "host")
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("@bazel_gazelle//:def.bzl", "gazelle", "gazelle_binary")
 load("//lib:write_source_files.bzl", "write_source_files")
 load("//lib:yq.bzl", "yq")
 load("//lib:diff_test.bzl", "diff_test")
+load("//lib:testing.bzl", "assert_contains")
 load("@bazel_skylib//rules:write_file.bzl", "write_file")
 load("@bazel_skylib//rules:copy_file.bzl", "copy_file")
 
@@ -69,3 +71,9 @@ diff_test(
     file1 = "external-dir/foo.txt",
     file2 = "foo_copy.txt",
 )
+
+assert_contains(
+    name = "bazel_version_test",
+    actual = ".bazelversion",
+    expected = str(host.bazel_version),
+)

WORKSPACE

@@ -25,6 +25,10 @@ local_repository(
     path = "./lib/tests/external_test_repo",
 )
 
+load("//lib:host_repo.bzl", "host_repo")
+
+host_repo(name = "aspect_bazel_lib_host")
+
 ############################################
 # Gazelle, for generating bzl_library targets
 load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")

lib/BUILD.bazel

@@ -147,7 +147,10 @@ bzl_library(
 bzl_library(
     name = "host_repo",
     srcs = ["host_repo.bzl"],
-    deps = ["//lib/private:host_repo"],
+    deps = [
+        "//lib/private:host_repo",
+        "@bazel_skylib//lib:versions",
+    ],
 )
 
 bzl_library(

lib/private/host_repo.bzl

@@ -1,5 +1,6 @@
 "A repository that exposes information about the host platform"
 
+load("@bazel_skylib//lib:versions.bzl", "versions")
 load(":repo_utils.bzl", "repo_utils")
 
 def _impl(rctx):
@@ -17,6 +18,7 @@ bzl_library(
     rctx.file("defs.bzl", content = """# @generated by @aspect_bazel_lib//lib/private:host_repo.bzl
 # Information about the host platform
 host = struct(
+    bazel_version = "{bazel_version}",
     is_darwin = {is_darwin},
     is_linux = {is_linux},
     is_windows = {is_windows},
@@ -24,6 +26,7 @@ host = struct(
     platform = "{platform}",
 )
 """.format(
+        bazel_version = versions.get(),
         is_darwin = repo_utils.is_darwin(rctx),
         is_linux = repo_utils.is_linux(rctx),
         is_windows = repo_utils.is_windows(rctx),