llvm_tools: abandon CLs after completing LLVM bisection.

Abandon CLs created for bisection if LLVM bisection successfully found
the root cause.

BUG=chromium:1081457
TEST=Verified locally.

Change-Id: I3702c38432fbaf87f7df62418c0b29cbe4ca722a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2382420
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: Jian Cai <jiancai@google.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/llvm_tools/llvm_bisection.py b/llvm_tools/llvm_bisection.py
index 37320baf..c8d694cd 100755
--- a/llvm_tools/llvm_bisection.py
+++ b/llvm_tools/llvm_bisection.py
@@ -13,6 +13,7 @@ import enum
 import errno
 import json
 import os
+import subprocess
 import sys
 
 import chroot
@@ -117,6 +118,13 @@ def GetCommandLineArgs():
       help='display contents of a command to the terminal '
       '(default: %(default)s)')
 
+  # Add argument for whether to display command contents to `stdout`.
+  parser.add_argument(
+      '--nocleanup',
+      action='store_false',
+      dest='cleanup',
+      help='Abandon CLs created for bisectoin')
+
   args_output = parser.parse_args()
 
   assert args_output.start_rev < args_output.end_rev, (
@@ -348,6 +356,19 @@ def main(args_output):
                                 '\n'.join(str(rev) for rev in skip_revisions))
       print(skip_revisions_message)
 
+    if args_output.cleanup:
+      # Abondon all the CLs created for bisection
+      gerrit = os.path.join(args_output.chroot_path, 'chromite/bin/gerrit')
+      for build in bisect_state['jobs']:
+        try:
+          subprocess.check_output([gerrit, 'abandon', build['cl']],
+                                  stderr=subprocess.STDOUT,
+                                  encoding='utf-8')
+        except subprocess.CalledProcessError as err:
+          # the CL may have been abandoned
+          if 'chromite.lib.gob_util.GOBError' not in err.output:
+            raise
+
     return BisectionExitStatus.BISECTION_COMPLETE.value
 
   for rev in revisions: