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#!/usr/bin/python
# Copyright (c) 2014 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.
"""Find and display recent changes in the given GM.
Example usage:
$ python gm/show_gm_changes.py Test-Mac10.7-MacMini4.1-GeForce320M-x86-Debug \
shadertext_gpu --autogen-path .gm-actuals
Rev Hash
15990 10904734222736193002
10729 10752292282035416719
8504 2915063876615374518
71 7546128203733045901
"""
import argparse
import json
import os
import re
import subprocess
import sys
def _get_hash_and_last_change(gm_name, filepath):
"""Find the current hash for the given GM and the last-changed revision.
This function runs "svn blame", which is slow.
Args:
gm_name: string; name of the GM in question.
filepath: string; path to the actual-results.json file.
Returns:
tuple of the form (last_changed_rev, hash), where last_changed_rev is an
int and hash is a string, or (None, None) if the file does not exist, the
GM is not found in the file, or some other problem occurs.
"""
if not os.path.isfile(filepath):
# If the file doesn't exist, we may have synced to before it was created.
return (None, None)
output = subprocess.check_output(['svn', 'blame', '--force', filepath])
pattern = (r'^\s+\d+\s+.+\s+"%s.png" : {\s*\n\s+\d+\s+.+\s+"allowed-digests" '
': \[\s*\n\s+(\d+)\s+.+\s+\[ "bitmap-64bitMD5",\s+\n*(\d+)')
match = re.search(pattern % gm_name, output, re.MULTILINE)
if match:
try:
return (int(match.groups()[0]), match.groups()[1])
except Exception:
# If there are any problems with the above (incorrect number of matches,
# inability to parse an integer), just return None.
return (None, None)
return (None, None)
def find_changes(builder_name, gm_name, autogen_path):
"""Find and return recent changes in the given GM.
This function runs "svn blame" and "svn update" numerous times and is
therefore very slow.
Args:
builder_name: string; name of the builder.
gm_name: string; name of the GM.
autogen_path: string; path to skia-autogen checkout.
Yields:
tuples of the form: (autogen_revision, hash)
"""
actuals_path = os.path.join(autogen_path, builder_name, 'actual-results.json')
# Capture the initial state of the skia-autogen checkout so that we can return
# to the same state later.
orig_rev = subprocess.check_output(['svnversion', '.'],
cwd=autogen_path).rstrip()
try:
last_change_rev, hash = _get_hash_and_last_change(gm_name, actuals_path)
while last_change_rev:
yield (str(last_change_rev), hash)
# Sync to the revision just *before* the last change
subprocess.check_call(['svn', 'update', '-r', str(last_change_rev - 1)],
cwd=autogen_path,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
last_change_rev, hash = _get_hash_and_last_change(gm_name, actuals_path)
finally:
# Return the repository to its initial state.
subprocess.check_call(['svn', 'update', '-r', orig_rev],
cwd=autogen_path,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
def main():
"""Find and display recent changes in the given GM."""
parser = argparse.ArgumentParser(description=sys.modules[__name__].__doc__)
parser.add_argument('builder_name', help='Name of the builder.')
parser.add_argument('gm_name', help='Name of the GM.')
parser.add_argument('--autogen-path', default=os.curdir,
help=('Path to a skia-autogen checkout. This checkout '
'will be modified but the script will attempt to '
'restore it to its original state. Default: '
'"%(default)s"'))
args = parser.parse_args()
print 'Rev\tHash'
for change in find_changes(args.builder_name, args.gm_name,
args.autogen_path):
print '\t'.join(change)
if __name__ == '__main__':
sys.exit(main())
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