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# Copyright (C) 2005, 2006 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
from __future__ import absolute_import
import errno
import os
from subprocess import Popen, PIPE
from bzrlib.errors import NoDiff3
from bzrlib.textfile import check_text_path
"""Diff and patch functionality"""
__docformat__ = "restructuredtext"
_do_close_fds = True
if os.name == 'nt':
_do_close_fds = False
def write_to_cmd(args, input=""):
"""Spawn a process, and wait for the result
If the process is killed, an exception is raised
:param args: The command line, the first entry should be the program name
:param input: [optional] The text to send the process on stdin
:return: (stdout, stderr, status)
"""
process = Popen(args, bufsize=len(input), stdin=PIPE, stdout=PIPE,
stderr=PIPE, close_fds=_do_close_fds)
stdout, stderr = process.communicate(input)
status = process.wait()
if status < 0:
raise Exception("%s killed by signal %i" (args[0], -status))
return stdout, stderr, status
def patch(patch_contents, filename, output_filename=None, reverse=False):
"""Apply a patch to a file, to produce another output file. This is should
be suitable for our limited purposes.
:param patch_contents: The contents of the patch to apply
:type patch_contents: str
:param filename: the name of the file to apply the patch to
:type filename: str
:param output_filename: The filename to produce. If None, file is \
modified in-place
:type output_filename: str or NoneType
:param reverse: If true, apply the patch in reverse
:type reverse: bool
:return: 0 on success, 1 if some hunks failed
"""
args = ["patch", "-f", "-s", "--posix", "--binary"]
if reverse:
args.append("--reverse")
if output_filename is not None:
args.extend(("-o", output_filename))
args.append(filename)
stdout, stderr, status = write_to_cmd(args, patch_contents)
return status
def diff3(out_file, mine_path, older_path, yours_path):
def add_label(args, label):
args.extend(("-L", label))
check_text_path(mine_path)
check_text_path(older_path)
check_text_path(yours_path)
args = ['diff3', "-E", "--merge"]
add_label(args, "TREE")
add_label(args, "ANCESTOR")
add_label(args, "MERGE-SOURCE")
args.extend((mine_path, older_path, yours_path))
try:
output, stderr, status = write_to_cmd(args)
except OSError, e:
if e.errno == errno.ENOENT:
raise NoDiff3
else:
raise
if status not in (0, 1):
raise Exception(stderr)
f = open(out_file, 'wb')
try:
f.write(output)
finally:
f.close()
return status
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