fix: allow each language to specify how many components to skip while…

… unpacking the tar file generated by bazel (#675)

synthtool/gcp/gapic_bazel.py

@@ -58,7 +58,9 @@ def php_library(self, service: str, version: str, **kwargs) -> Path:
  return self._generate_code(service, version, "php", **kwargs)
 
  def java_library(self, service: str, version: str, **kwargs) -> Path:
- return self._generate_code(service, version, "java", **kwargs)
+ return self._generate_code(
+ service, version, "java", tar_strip_components=0, **kwargs
+ )
 
  def ruby_library(self, service: str, version: str, **kwargs) -> Path:
  return self._generate_code(service, version, "ruby", **kwargs)
@@ -76,6 +78,7 @@ def _generate_code(
  bazel_target: str = None,
  include_protos: bool = False,
  proto_output_path: Union[str, Path] = None,
+ tar_strip_components: int = 1,
  ):
  # Determine which googleapis repo to use
  if discogapic:
@@ -190,7 +193,7 @@ def _generate_code(
  "tar",
  "-C",
  str(output_dir),
- "--strip-components=1",
+ f"--strip-components={tar_strip_components}",
  "-xzf",
  tar_file,
  ]