LLVM tools: patch management for LLVM and patch manager

The script 'llvm_patch_management.py' constructs the arguments for the
patch manager to handle patches of a package. The script 'patch_manager.py'
is the patch manager. The patch manager has different modes to handle
all applicable patches that fail to apply. The mode 'bisect_patches' is
a WIP.

BUG=None
TEST=Created a json file that has the patches of the LLVM ebuild and used
the default failure mode of the patch manager. All patches applied successfully
for r365631.

Change-Id: I42f339ac0bb7c35d70a96cc0c2daeb470336b13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1708223
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: Salud Lemus <saludlemus@google.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm_tools/failure_modes.py b/llvm_tools/failure_modes.py
new file mode 100644
index 00000000..6a381c2e
--- /dev/null
+++ b/llvm_tools/failure_modes.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Failure mode constants avaiable to the patch manager."""
+
+from __future__ import print_function
+
+import enum
+
+
+class FailureModes(enum.Enum):
+  """Different modes for the patch manager when handling a failed patch."""
+
+  FAIL = 'fail'
+  CONTINUE = 'continue'
+  DISABLE_PATCHES = 'disable_patches'
+  BISECT_PATCHES = 'bisect_patches'
+  REMOVE_PATCHES = 'remove_patches'