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BUG=b:233893248
TEST=CQ

Change-Id: I66591d7a738d241aed3290138c0f68065ab10a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3879174
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/api/controller/payload.py b/api/controller/payload.py
index 343baa1..f758b3c 100644
--- a/api/controller/payload.py
+++ b/api/controller/payload.py
@@ -16,117 +16,132 @@
 
 
 if TYPE_CHECKING:
-  from chromite.api import api_config
+    from chromite.api import api_config
 
-_VALID_IMAGE_PAIRS = (('src_signed_image', 'tgt_signed_image'),
-                      ('src_unsigned_image', 'tgt_unsigned_image'),
-                      ('src_dlc_image', 'tgt_dlc_image'),
-                      ('full_update', 'tgt_unsigned_image'),
-                      ('full_update', 'tgt_signed_image'),
-                      ('full_update', 'tgt_dlc_image'))
-_VALID_MINIOS_PAIRS = (('src_signed_image', 'tgt_signed_image'),
-                       ('src_unsigned_image', 'tgt_unsigned_image'),
-                       ('full_update', 'tgt_unsigned_image'),
-                       ('full_update', 'tgt_signed_image'))
+_VALID_IMAGE_PAIRS = (
+    ("src_signed_image", "tgt_signed_image"),
+    ("src_unsigned_image", "tgt_unsigned_image"),
+    ("src_dlc_image", "tgt_dlc_image"),
+    ("full_update", "tgt_unsigned_image"),
+    ("full_update", "tgt_signed_image"),
+    ("full_update", "tgt_dlc_image"),
+)
+_VALID_MINIOS_PAIRS = (
+    ("src_signed_image", "tgt_signed_image"),
+    ("src_unsigned_image", "tgt_unsigned_image"),
+    ("full_update", "tgt_unsigned_image"),
+    ("full_update", "tgt_signed_image"),
+)
 
 # TODO: Remove to use the standard cache directory if possible, otherwise
 #  document why it cannot be used and preferably move outside of the repo.
-_DEFAULT_PAYGEN_CACHE_DIR = '.paygen_cache'
+_DEFAULT_PAYGEN_CACHE_DIR = ".paygen_cache"
 
 # We have more fields we might validate however, they're either
 # 'oneof' or allowed to be the empty value by design. If @validate
 # gets more complex in the future we can add more here.
 @faux.empty_success
 @faux.empty_completed_unsuccessfully_error
-@validate.require('bucket')
-def GeneratePayload(input_proto: payload_pb2.GenerationRequest,
-                    output_proto: payload_pb2.GenerationResponse,
-                    config: 'api_config.ApiConfig') -> int:
-  """Generate a update payload ('do paygen').
+@validate.require("bucket")
+def GeneratePayload(
+    input_proto: payload_pb2.GenerationRequest,
+    output_proto: payload_pb2.GenerationResponse,
+    config: "api_config.ApiConfig",
+) -> int:
+    """Generate a update payload ('do paygen').
 
-  Args:
-    input_proto: Input proto.
-    output_proto: Output proto.
-    config: The API call config.
+    Args:
+      input_proto: Input proto.
+      output_proto: Output proto.
+      config: The API call config.
 
-  Returns:
-    A controller return code (e.g. controller.RETURN_CODE_SUCCESS).
-  """
+    Returns:
+      A controller return code (e.g. controller.RETURN_CODE_SUCCESS).
+    """
 
-  # Resolve the tgt image oneof.
-  tgt_name = input_proto.WhichOneof('tgt_image_oneof')
-  try:
-    tgt_image = getattr(input_proto, tgt_name)
-  except AttributeError:
-    cros_build_lib.Die('%s is not a known tgt image type' % (tgt_name,))
-
-  # Resolve the src image oneof.
-  src_name = input_proto.WhichOneof('src_image_oneof')
-
-  # If the source image is 'full_update' we lack a source entirely.
-  if src_name == 'full_update':
-    src_image = None
-  # Otherwise we have an image.
-  else:
+    # Resolve the tgt image oneof.
+    tgt_name = input_proto.WhichOneof("tgt_image_oneof")
     try:
-      src_image = getattr(input_proto, src_name)
+        tgt_image = getattr(input_proto, tgt_name)
     except AttributeError:
-      cros_build_lib.Die('%s is not a known src image type' % (src_name,))
+        cros_build_lib.Die("%s is not a known tgt image type" % (tgt_name,))
 
-  # Ensure they are compatible oneofs.
-  if (src_name, tgt_name) not in _VALID_IMAGE_PAIRS:
-    cros_build_lib.Die('%s and %s are not valid image pairs' %
-                       (src_image, tgt_image))
+    # Resolve the src image oneof.
+    src_name = input_proto.WhichOneof("src_image_oneof")
 
-  # Ensure that miniOS payloads are only requested for compatible image types.
-  if input_proto.minios and (src_name, tgt_name) not in _VALID_MINIOS_PAIRS:
-    cros_build_lib.Die('%s and %s are not valid image pairs for miniOS' %
-                       (src_image, tgt_image))
+    # If the source image is 'full_update' we lack a source entirely.
+    if src_name == "full_update":
+        src_image = None
+    # Otherwise we have an image.
+    else:
+        try:
+            src_image = getattr(input_proto, src_name)
+        except AttributeError:
+            cros_build_lib.Die("%s is not a known src image type" % (src_name,))
 
-  # Find the value of bucket or default to 'chromeos-releases'.
-  destination_bucket = input_proto.bucket or 'chromeos-releases'
+    # Ensure they are compatible oneofs.
+    if (src_name, tgt_name) not in _VALID_IMAGE_PAIRS:
+        cros_build_lib.Die(
+            "%s and %s are not valid image pairs" % (src_image, tgt_image)
+        )
 
-  # There's a potential that some paygen_lib library might raise here, but since
-  # we're still involved in config we'll keep it before the validate_only.
-  payload_config = payload.PayloadConfig(tgt_image, src_image,
-                                         destination_bucket, input_proto.minios,
-                                         input_proto.verify,
-                                         upload=not input_proto.dryrun,
-                                         cache_dir=_DEFAULT_PAYGEN_CACHE_DIR)
+    # Ensure that miniOS payloads are only requested for compatible image types.
+    if input_proto.minios and (src_name, tgt_name) not in _VALID_MINIOS_PAIRS:
+        cros_build_lib.Die(
+            "%s and %s are not valid image pairs for miniOS"
+            % (src_image, tgt_image)
+        )
 
-  # If configured for validation only we're done here.
-  if config.validate_only:
-    return controller.RETURN_CODE_VALID_INPUT
+    # Find the value of bucket or default to 'chromeos-releases'.
+    destination_bucket = input_proto.bucket or "chromeos-releases"
 
-  # Do payload generation.
-  local_path, remote_uri = '', ''
-  try:
-    local_path, remote_uri = payload_config.GeneratePayload()
-  except paygen_payload_lib.PayloadGenerationSkippedException as e:
-    # If paygen was skipped, provide a reason if possible.
-    if isinstance(e, paygen_payload_lib.NoMiniOSPartitionException):
-      reason = payload_pb2.GenerationResponse.NOT_MINIOS_COMPATIBLE
-      output_proto.failure_reason = reason
+    # There's a potential that some paygen_lib library might raise here, but since
+    # we're still involved in config we'll keep it before the validate_only.
+    payload_config = payload.PayloadConfig(
+        tgt_image,
+        src_image,
+        destination_bucket,
+        input_proto.minios,
+        input_proto.verify,
+        upload=not input_proto.dryrun,
+        cache_dir=_DEFAULT_PAYGEN_CACHE_DIR,
+    )
 
-  _SetGeneratePayloadOutputProto(output_proto, local_path, remote_uri)
-  if remote_uri or input_proto.dryrun and local_path:
-    return controller.RETURN_CODE_SUCCESS
-  elif output_proto.failure_reason:
-    return controller.RETURN_CODE_UNSUCCESSFUL_RESPONSE_AVAILABLE
-  else:
-    return controller.RETURN_CODE_COMPLETED_UNSUCCESSFULLY
+    # If configured for validation only we're done here.
+    if config.validate_only:
+        return controller.RETURN_CODE_VALID_INPUT
+
+    # Do payload generation.
+    local_path, remote_uri = "", ""
+    try:
+        local_path, remote_uri = payload_config.GeneratePayload()
+    except paygen_payload_lib.PayloadGenerationSkippedException as e:
+        # If paygen was skipped, provide a reason if possible.
+        if isinstance(e, paygen_payload_lib.NoMiniOSPartitionException):
+            reason = payload_pb2.GenerationResponse.NOT_MINIOS_COMPATIBLE
+            output_proto.failure_reason = reason
+
+    _SetGeneratePayloadOutputProto(output_proto, local_path, remote_uri)
+    if remote_uri or input_proto.dryrun and local_path:
+        return controller.RETURN_CODE_SUCCESS
+    elif output_proto.failure_reason:
+        return controller.RETURN_CODE_UNSUCCESSFUL_RESPONSE_AVAILABLE
+    else:
+        return controller.RETURN_CODE_COMPLETED_UNSUCCESSFULLY
 
 
-def _SetGeneratePayloadOutputProto(output_proto: payload_pb2.GenerationResponse,
-                                   local_path: str,
-                                   remote_uri: str):
-  """Set the output proto with the results from the service class.
+def _SetGeneratePayloadOutputProto(
+    output_proto: payload_pb2.GenerationResponse,
+    local_path: str,
+    remote_uri: str,
+):
+    """Set the output proto with the results from the service class.
 
-  Args:
-    output_proto: The output proto.
-    local_path: set output_proto with the local path, or ''.
-    remote_uri: set output_proto with the remote uri, or ''.
-  """
-  output_proto.success = True
-  output_proto.local_path = local_path or ''
-  output_proto.remote_uri = remote_uri or ''
+    Args:
+      output_proto: The output proto.
+      local_path: set output_proto with the local path, or ''.
+      remote_uri: set output_proto with the remote uri, or ''.
+    """
+    output_proto.success = True
+    output_proto.local_path = local_path or ""
+    output_proto.remote_uri = remote_uri or ""