Embed generated app-server schema bundles in Bazel builds (#54113)

## What changed

Use the stable and experimental bundles generated by `//bazel/schema:app-server` as compile-time inputs for `app-server-protocol` instead of the checked-in bundles.

Generalize `schema_generator_sources` to `schema_sources` so it can stage Rust sources alongside generated bundles. Keep empty bundle placeholders for the on-demand schema generator, which derives its output from Rust sources.

GitOrigin-RevId: a976c420a3698d631f3ea7c698b15b82391158e5

bazel/rules/schema_bundle.bzl

@@ -1,5 +1,7 @@
 """Generate API artifacts with the existing Rust and Python exporters."""
 
+load("@bazel_lib//lib:copy_file.bzl", "COPY_FILE_TOOLCHAINS", "copy_file_action")
+
 def _schema_bundle_impl(ctx):
     outputs = []
     for mode in ["stable", "experimental"]:
@@ -41,7 +43,7 @@ schema_bundle = rule(
     doc = "Generates both schema modes as cacheable actions with explicit tool dependencies.",
 )
 
-def _schema_generator_sources_impl(ctx):
+def _schema_sources_impl(ctx):
     sources = []
     crate_root = None
     prefix = ctx.label.package + "/"
@@ -57,22 +59,30 @@ def _schema_generator_sources_impl(ctx):
     if crate_root == None:
         fail("Schema generator sources must include src/lib.rs")
 
-    # The ignored generation function derives schemas from Rust. These embedded
-    # bundles are unused on that path, so do not read the committed artifacts.
+    # Runtime builds embed generated bundles. The generator needs only empty
+    # placeholders because its selected test derives the bundles from Rust.
     precomputed = [
         ctx.actions.declare_file(ctx.label.name + "/schema/precomputed/app-server-exports-" + mode + ".json.zst")
         for mode in ["stable", "experimental"]
     ]
-    for output in precomputed:
-        ctx.actions.write(output, "")
+    for mode, output in zip(["stable", "experimental"], precomputed):
+        if ctx.attr.schema:
+            directory = getattr(ctx.attr.schema[OutputGroupInfo], mode).to_list()[0]
+            copy_file_action(ctx, directory, output, dir_path = "precomputed/" + output.basename)
+        else:
+            ctx.actions.write(output, "")
     return [
         DefaultInfo(files = depset(sources)),
         OutputGroupInfo(crate_root = depset([crate_root]), precomputed = depset(precomputed)),
     ]
 
-schema_generator_sources = rule(
-    implementation = _schema_generator_sources_impl,
-    attrs = {"srcs": attr.label_list(allow_files = [".rs"])},
+schema_sources = rule(
+    implementation = _schema_sources_impl,
+    attrs = {
+        "srcs": attr.label_list(allow_files = [".rs"]),
+        "schema": attr.label(providers = [OutputGroupInfo]),
+    },
+    toolchains = COPY_FILE_TOOLCHAINS,
 )
 
 def _python_sdk_exports_impl(ctx):

codex-rs/app-server-protocol/BUILD.bazel

@@ -1,12 +1,25 @@
 load("@crates//:defs.bzl", "all_crate_deps")
 load("@rules_rust//rust:defs.bzl", "rust_binary")
 load("//:defs.bzl", "WINDOWS_RUSTC_LINK_FLAGS", "codex_rust_crate")
-load("//bazel/rules:schema_bundle.bzl", "schema_generator_sources")
+load("//bazel/rules:schema_bundle.bzl", "schema_sources")
+
+schema_sources(
+    name = "schema-sources",
+    srcs = glob(["src/**/*.rs"]),
+    schema = "//bazel/schema:app-server",
+)
+
+filegroup(
+    name = "schema-precomputed",
+    srcs = [":schema-sources"],
+    output_group = "precomputed",
+)
 
 codex_rust_crate(
     name = "app-server-protocol",
-    compile_data = glob(["schema/precomputed/**"]),
+    compile_data = [":schema-precomputed"],
     crate_name = "codex_app_server_protocol",
+    crate_srcs = [":schema-sources"],
     test_data_extra = glob(
         ["schema/**"],
         allow_empty = True,
@@ -21,7 +34,7 @@ alias(
     visibility = ["//bazel/schema:__pkg__"],
 )
 
-schema_generator_sources(
+schema_sources(
     name = "schema-generator-sources",
     srcs = glob(["src/**/*.rs"]),
     tags = ["manual"],