Handle root_symlinks and symlinks in OSS-Fuzz packaging

Bazel 9 provides the bash runfiles library via root_symlinks
instead of regular runfiles. The OSS-Fuzz packaging rule only
iterated over runfiles.files, missing root_symlinks entries
entirely and causing "cannot find runfiles.bash" errors at
runtime.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: fmeum

fuzzing/private/oss_fuzz/package.bzl

@@ -22,7 +22,7 @@ def _oss_fuzz_package_impl(ctx):
     binary_info = ctx.attr.binary[FuzzingBinaryInfo]
 
     binary_runfiles = binary_info.binary_runfiles.files.to_list()
-    archive_inputs = binary_runfiles
+    archive_inputs = list(binary_runfiles)
 
     runfiles_manifest = ctx.actions.declare_file(ctx.label.name + "_runfiles")
     local_jdk_prefix = Label("@local_jdk//:unused").workspace_name + "/"
@@ -39,6 +39,26 @@ def _oss_fuzz_package_impl(ctx):
         for runfile in binary_runfiles
         if runfile != binary_info.binary_file and not runfile_path(ctx, runfile).startswith(local_jdk_prefix)
     ])
+
+    # Handle root_symlinks, which place files at the root of the runfiles tree
+    # rather than under the workspace directory. In Bazel 9+, the bash runfiles
+    # library is provided via root_symlinks.
+    for symlink in binary_info.binary_runfiles.root_symlinks.to_list():
+        archive_inputs.append(symlink.target_file)
+        runfiles_manifest_content += "{path} {real_path}\n".format(
+            path = symlink.path,
+            real_path = symlink.target_file.path,
+        )
+
+    # Handle symlinks, which place files under the workspace directory at a
+    # path that differs from their default short_path.
+    for symlink in binary_info.binary_runfiles.symlinks.to_list():
+        archive_inputs.append(symlink.target_file)
+        runfiles_manifest_content += "{path} {real_path}\n".format(
+            path = ctx.workspace_name + "/" + symlink.path,
+            real_path = symlink.target_file.path,
+        )
+
     ctx.actions.write(runfiles_manifest, runfiles_manifest_content, False)
     archive_inputs.append(runfiles_manifest)