Reland 9756ee7cba

Since Fuchsia engineers rarely work within this repo, initialize a lightweight fake @fuchsia_sdk repo rather than distributing the Fuchsia SDK here.

Tested locally via `bazel query --[no]enable_bzlmod "deps(set(//googletest/test:gtest_all_test))"` (#4472)

PiperOrigin-RevId: 610826859
Change-Id: I7d41b1dbe9e7f133fe535d7337dc5bff5bf97d3a

fake_fuchsia_sdk.bzl

@@ -0,0 +1,33 @@
+"""Provides a fake @fuchsia_sdk implementation that's used when the real one isn't available.
+
+This is needed since bazel queries on targets that depend on //:gtest (eg:
+`bazel query "deps(set(//googletest/test:gtest_all_test))"`) will fail if @fuchsia_sdk is not
+defined when bazel is evaluating the transitive closure of the query target.
+
+See https://github.com/google/googletest/issues/4472.
+"""
+
+def _fake_fuchsia_sdk_impl(repo_ctx):
+    for stub_target in repo_ctx.attr._stub_build_targets:
+        stub_package = stub_target
+        stub_target_name = stub_target.split("/")[-1]
+        repo_ctx.file("%s/BUILD.bazel" % stub_package, """
+filegroup(
+    name = "%s",
+)
+""" % stub_target_name)
+
+fake_fuchsia_sdk = repository_rule(
+    doc = "Used to create a fake @fuchsia_sdk repository with stub build targets.",
+    implementation = _fake_fuchsia_sdk_impl,
+    attrs = {
+        "_stub_build_targets": attr.string_list(
+            doc = "The stub build targets to initialize.",
+            default = [
+                "pkg/fdio",
+                "pkg/syslog",
+                "pkg/zx",
+            ],
+        ),
+    },
+)