Add the --grpc_port startup option and start a Java server if it's passed in.

Note that the presence of server/grpc_port does not guarantee that the server actually listens to it and we can't guarantee it, either, because it can always be kill -9'd.

I haven't decided yet how the transition between AF_UNIX and gRPC will work. For now, I'm happy that we can start up a Java server.

The way to get the kernel-chosen port is truly awful, but it is apparently impossible to do so in a different way:

https://github.com/grpc/grpc-java/issues/72

--
MOS_MIGRATED_REVID=119828354

1 files changed, 6 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BlazeServerStartupOptions.java b/src/main/java/com/google/devtools/build/lib/runtime/BlazeServerStartupOptions.java
index c4fc2c3fff..35bc68e076 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/BlazeServerStartupOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BlazeServerStartupOptions.java
@@ -257,4 +257,10 @@ public class BlazeServerStartupOptions extends OptionsBase {
           + "invocation_policy.InvocationPolicy proto. Unlike other options, it is an error to "
           + "specify --invocation_policy multiple times.")
   public String invocationPolicy;
+
+  @Option(name = "grpc_port",
+      defaultValue = "-1",
+      category = "undocumented",
+      help = "Port to start up the gRPC command server on. If 0, let the kernel choose.")
+  public int grpcPort;
 }