rules_go.patch

#
# Bazel RBE on Windows GCP workers currently will not invoke cmd.exe batch files correctly
#
# Symptom is program not found 'bazel-out', because of the way that the CreateProcess command
# is constructed by bazel with actions.run with forward slashes, e.g. the command
#   cmd.exe /c "bazel-out/host/bin/external/go_sdk/builder.exe.bat"
# where cmd.exe on GCP is treating 'bazel-out' as the target, and /host as a command line switch.
# This problem was not observed on Azure CI pipelines or locally by the developers. The eventual
# fix is not specific to rules_go; this patch simply addresses immediate breakage and can be removed
# once the underlying issue within Bazel/RBE is fixed.
# See:
# - https://github.com/bazelbuild/rules_go/pull/2542
# - https://github.com/envoyproxy/envoy/issues/11657
#
diff --git a/go/private/rules/binary.bzl b/go/private/rules/binary.bzl
index b88dfd96..e68b5ece 100644
--- a/go/private/rules/binary.bzl
+++ b/go/private/rules/binary.bzl
@@ -128,8 +128,9 @@ def _go_tool_binary_impl(ctx):
             content = cmd,
         )
         ctx.actions.run(
-            executable = bat,
-            inputs = sdk.libs + sdk.headers + sdk.tools + ctx.files.srcs + [sdk.go],
+            executable = "cmd.exe",
+            arguments = ["/S", "/C", bat.path.replace("/", "\\")],
+            inputs = sdk.libs + sdk.headers + sdk.tools + ctx.files.srcs + [sdk.go, bat],
             outputs = [cout],
             env = {"GOROOT": sdk.root_file.dirname},  # NOTE(#2005): avoid realpath in sandbox
             mnemonic = "GoToolchainBinaryCompile",