patchwork/patchwork/hasher.py at main · getpatchwork/patchwork · GitHub

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#!/usr/bin/env python

# Patchwork - automated patch tracking system

# SPDX-License-Identifier: GPL-2.0-or-later

"""Hash generation for diffs."""

import hashlib

import re

import sys

HUNK_RE = re.compile(r'^\@\@ -\d+(?:,(\d+))? \+\d+(?:,(\d+))? \@\@')

FILENAME_RE = re.compile(r'^(---|\+\+\+) (\S+)')

def hash_diff(diff):

"""Generate a hash from a diff."""

# normalise spaces

diff = diff.replace('\r', '')

diff = diff.strip() + '\n'

prefixes = ['-', '+', ' ']

hashed = hashlib.sha1()

for line in diff.split('\n'):

if len(line) <= 0:

continue

hunk_match = HUNK_RE.match(line)

filename_match = FILENAME_RE.match(line)

if filename_match:

# normalise -p1 top-directories

if filename_match.group(1) == '---':

filename = 'a/'

else:

filename = 'b/'

filename += '/'.join(filename_match.group(2).split('/')[1:])

line = filename_match.group(1) + ' ' + filename

elif hunk_match:

# remove line numbers, but leave line counts

def fn(x):

if not x:

return 1

return int(x)

line_nos = list(map(fn, hunk_match.groups()))

line = '@@ -%d +%d @@' % tuple(line_nos)

elif line[0] in prefixes:

# if we have a +, - or context line, leave as-is

pass

else:

# other lines are ignored

continue

hashed.update((line + '\n').encode('utf-8'))

return hashed.hexdigest()

def main(args):

"""Hash a diff provided by stdin.

This is required by scripts found in /tools

"""

print(hash_diff('\n'.join(sys.stdin.readlines())))

if __name__ == '__main__':

sys.exit(main(sys.argv))

patchwork/patchwork/hasher.py at main · getpatchwork/patchwork · GitHub

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