tonic-build: Allow setting skip_protoc_run on the prost Builder

tonic-build/src/prost.rs

@@ -20,6 +20,7 @@ pub fn configure() -> Builder {
  build_server: true,
  build_transport: true,
  file_descriptor_set_path: None,
+ skip_protoc_run: false,
  out_dir: None,
  extern_path: Vec::new(),
  field_attributes: Vec::new(),
@@ -224,6 +225,7 @@ pub struct Builder {
  pub(crate) build_server: bool,
  pub(crate) build_transport: bool,
  pub(crate) file_descriptor_set_path: Option<PathBuf>,
+ pub(crate) skip_protoc_run: bool,
  pub(crate) extern_path: Vec<(String, String)>,
  pub(crate) field_attributes: Vec<(String, String)>,
  pub(crate) type_attributes: Vec<(String, String)>,
@@ -271,6 +273,14 @@ impl Builder {
  self
  }
 
+ /// In combination with with file_descriptor_set_path, this can be used to provide a file
+ /// descriptor set as an input file, rather than having prost-build generate the file by
+ /// calling protoc.
+ pub fn skip_protoc_run(mut self) -> Self {
+ self.skip_protoc_run = true;
+ self
+ }
+
  /// Set the output directory to generate code to.
  ///
  /// Defaults to the `OUT_DIR` environment variable.
@@ -464,6 +474,9 @@ impl Builder {
  if let Some(path) = self.file_descriptor_set_path.as_ref() {
  config.file_descriptor_set_path(path);
  }
+ if self.skip_protoc_run {
+ config.skip_protoc_run();
+ }
  for (proto_path, rust_path) in self.extern_path.iter() {
  config.extern_path(proto_path, rust_path);
  }