trigger_scripts: apply format

This is preparation to replace Swarming Python client usage with Go
client.

I modified comment to fit 80 char limit.

Bug: 984869
Change-Id: Ie890e6211d5655ea2d561986cd3d39d8c4e36ffb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2992425
Auto-Submit: Takuto Ikuta <[email protected]>
Commit-Queue: Brian Sheedy <[email protected]>
Reviewed-by: Brian Sheedy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#896533}
diff --git a/testing/trigger_scripts/chromeos_device_trigger.py b/testing/trigger_scripts/chromeos_device_trigger.py
index a3b5fe4..fb1fc4cf 100755
--- a/testing/trigger_scripts/chromeos_device_trigger.py
+++ b/testing/trigger_scripts/chromeos_device_trigger.py
@@ -2,7 +2,6 @@
 # Copyright 2019 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
-
 """Custom swarming trigger script for ChromeOS device tests.
 
 CrOS device tests are unique in that the device OS they prefer to run on is
@@ -25,9 +24,8 @@
 
 import base_test_triggerer
 
-
-SRC_DIR = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(
-  __file__))))
+SRC_DIR = os.path.dirname(
+    os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 LKGM_FILE_PATH = os.path.join(SRC_DIR, 'chromeos', 'CHROMEOS_LKGM')
 # Should match something that looks like "12345.0.0".
 LKGM_RE = re.compile(r'\d+\.\d+\.\d+')
@@ -35,93 +33,103 @@
 
 
 def read_current_lkgm():
-  if not os.path.exists(LKGM_FILE_PATH):
-    sys.stderr.write('LKGM file not present at %s\n' % LKGM_FILE_PATH)
-    return None
+    if not os.path.exists(LKGM_FILE_PATH):
+        sys.stderr.write('LKGM file not present at %s\n' % LKGM_FILE_PATH)
+        return None
 
-  with open(LKGM_FILE_PATH) as f:
-    lkgm = f.read().strip()
+    with open(LKGM_FILE_PATH) as f:
+        lkgm = f.read().strip()
 
-  if not LKGM_RE.match(lkgm):
-    sys.stderr.write('Unknown format of LKGM: %s\n' % lkgm)
-    return None
+    if not LKGM_RE.match(lkgm):
+        sys.stderr.write('Unknown format of LKGM: %s\n' % lkgm)
+        return None
 
-  # Just the major version should be sufficient.
-  return lkgm.split('.')[0]
+    # Just the major version should be sufficient.
+    return lkgm.split('.')[0]
 
 
 def parse_args(triggerer):
-  # This script will do nothing but inspect and tweak the dimension args to
-  # `swarming.py trigger`. So let's pull just those out.
-  parser = argparse.ArgumentParser(description=__doc__)
-  parser.add_argument(
-      '-d', '--dimension', default=[], action='append', nargs=2,
-      dest='dimensions',
-      help='Dimensions to filter on. Duplicated from the `swarming.py trigger` '
-           'command. Parsed here to ensure `device_os` is not added.'
-  )
-  parser.add_argument(
-      '--optional-dimension', default=[], action='append', nargs=3,
-      dest='optional_dimensions',
-      help='Optional dimensions which will result in additional task slices. '
-           'Duplicated from the `swarming.py trigger` command.')
-  base_test_triggerer.BaseTestTriggerer.setup_parser_contract(parser)
-  args, additional_args = parser.parse_known_args()
-  additional_args = triggerer.modify_args(
-      additional_args, 0, args.shard_index, args.shards, args.dump_json)
+    # This script will do nothing but inspect and tweak the dimension args to
+    # `swarming.py trigger`. So let's pull just those out.
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        '-d',
+        '--dimension',
+        default=[],
+        action='append',
+        nargs=2,
+        dest='dimensions',
+        help=
+        'Dimensions to filter on. Duplicated from the `swarming.py trigger` '
+        'command. Parsed here to ensure `device_os` is not added.')
+    parser.add_argument(
+        '--optional-dimension',
+        default=[],
+        action='append',
+        nargs=3,
+        dest='optional_dimensions',
+        help='Optional dimensions which will result in additional task slices. '
+        'Duplicated from the `swarming.py trigger` command.')
+    base_test_triggerer.BaseTestTriggerer.setup_parser_contract(parser)
+    args, additional_args = parser.parse_known_args()
+    additional_args = triggerer.modify_args(additional_args, 0,
+                                            args.shard_index, args.shards,
+                                            args.dump_json)
 
-  if additional_args[0] != 'trigger':
-    parser.error(
-        'This script is only supported for `swarming.py trigger` invocations.')
+    if additional_args[0] != 'trigger':
+        parser.error(
+            'This script is only supported for `swarming.py trigger`'
+            ' invocations.'
+        )
 
-  for k, _ in args.dimensions:
-    if k == 'device_os':
-      parser.error(
-          'Must not specify the device_os dimension when using this script. '
-          '(It will be added automatically.)')
+    for k, _ in args.dimensions:
+        if k == 'device_os':
+            parser.error(
+                'Must not specify the device_os dimension when using this'
+                ' script. (It will be added automatically.)')
 
-  # It might be a valid use-case to include optional-dimensions in the initial
-  # invocation. But it'd be difficult to integrate them into what we're doing
-  # here. So let's just ensure there aren't any.
-  if args.optional_dimensions:
-    parser.error(
-        'Must not specify optional dimensions when using this script.')
+    # It might be a valid use-case to include optional-dimensions in the initial
+    # invocation. But it'd be difficult to integrate them into what we're doing
+    # here. So let's just ensure there aren't any.
+    if args.optional_dimensions:
+        parser.error(
+            'Must not specify optional dimensions when using this script.')
 
-  return args, additional_args
+    return args, additional_args
 
 
 def main():
-  triggerer = base_test_triggerer.BaseTestTriggerer()
-  args, additional_args = parse_args(triggerer)
+    triggerer = base_test_triggerer.BaseTestTriggerer()
+    args, additional_args = parse_args(triggerer)
 
-  current_lkgm = read_current_lkgm()
-  if not current_lkgm:
-    return 1
+    current_lkgm = read_current_lkgm()
+    if not current_lkgm:
+        return 1
 
-  new_args = additional_args[:1]
-  # Insert our modified dimension args in between the 1st and 2nd args of the
-  # initial `swarming.py` invocation. This avoids the presence of the special
-  # `--` arg from causing swarming.py to ignore them.
-  needs_device_status = True
-  for k, v in args.dimensions:
-    new_args.extend(['--dimension', k, v])
-    if k == 'device_status':
-      needs_device_status = False
+    new_args = additional_args[:1]
+    # Insert our modified dimension args in between the 1st and 2nd args of the
+    # initial `swarming.py` invocation. This avoids the presence of the special
+    # `--` arg from causing swarming.py to ignore them.
+    needs_device_status = True
+    for k, v in args.dimensions:
+        new_args.extend(['--dimension', k, v])
+        if k == 'device_status':
+            needs_device_status = False
 
-  # Only CrOS device bots with a device_status dimension of "available" should
-  # run tests. So target those explicitly if we aren't already.
-  if needs_device_status:
-    new_args.extend(['--dimension', 'device_status', 'available'])
+    # Only CrOS device bots with a device_status dimension of "available" should
+    # run tests. So target those explicitly if we aren't already.
+    if needs_device_status:
+        new_args.extend(['--dimension', 'device_status', 'available'])
 
-  new_args.extend([
-      '-optional-dimension',
-      'device_os=%s:%d' % (current_lkgm, PRIMARY_SLICE_EXPIRATION_S),
-  ])
-  new_args += additional_args[1:]
+    new_args.extend([
+        '-optional-dimension',
+        'device_os=%s:%d' % (current_lkgm, PRIMARY_SLICE_EXPIRATION_S),
+    ])
+    new_args += additional_args[1:]
 
-  return triggerer.run_swarming_go(
-    new_args, True, args.dump_json, args.shard_index or 0, args.shards)
+    return triggerer.run_swarming_go(new_args, True, args.dump_json,
+                                     args.shard_index or 0, args.shards)
 
 
 if __name__ == '__main__':
-  sys.exit(main())
+    sys.exit(main())