grpc-protoinfo-3.patch

commit e2ba3aa07009292617c3cabe734e8e44099b22ac
Author: Lukacs T. Berki <lberki@google.com>
Date:   Tue Aug 6 14:00:11 2019 +0200

    Update C++ code generation to work with Bazel 0.29 .
    
    The above Bazel version changes proto compilation slightly: some proto
    files are put into a `_virtual_imports` directory and thus
    `_get_include_directory` needs to be updated accordingly.
    
    Ideally, it would use instead the `ProtoInfo` provider to tease out the
    proto import directories, but that's a bit more intrusive change.

diff --git a/bazel/protobuf.bzl b/bazel/protobuf.bzl
index f2df7bd87b..3066e1d550 100644
--- a/bazel/protobuf.bzl
+++ b/bazel/protobuf.bzl
@@ -59,6 +59,13 @@ def proto_path_to_generated_filename(proto_path, fmt_str):
 def _get_include_directory(include):
     directory = include.path
     prefix_len = 0
+
+    virtual_imports = "/_virtual_imports/"
+    if not include.is_source and virtual_imports in include.path:
+        root, relative = include.path.split(virtual_imports, 2)
+        result = root + virtual_imports + relative.split("/", 1)[0]
+        return result
+
     if not include.is_source and directory.startswith(include.root.path):
         prefix_len = len(include.root.path) + 1