1
# Copyright (C) 2005, 2006 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
4
Diff and patch functionality
20
from subprocess import Popen, PIPE
22
from bzrlib.errors import NoDiff3
23
from bzrlib.textfile import check_text_path
25
"""Diff and patch functionality"""
6
27
__docformat__ = "restructuredtext"
35
def write_to_cmd(args, input=""):
36
"""Spawn a process, and wait for the result
38
If the process is killed, an exception is raised
40
:param args: The command line, the first entry should be the program name
41
:param input: [optional] The text to send the process on stdin
42
:return: (stdout, stderr, status)
44
process = Popen(args, bufsize=len(input), stdin=PIPE, stdout=PIPE,
45
stderr=PIPE, close_fds=_do_close_fds)
46
stdout, stderr = process.communicate(input)
47
status = process.wait()
49
raise Exception("%s killed by signal %i" (args[0], -status))
50
return stdout, stderr, status
8
53
def patch(patch_contents, filename, output_filename=None, reverse=False):
9
54
"""Apply a patch to a file, to produce another output file. This is should
10
55
be suitable for our limited purposes.
26
71
if output_filename is not None:
27
72
args.extend(("-o", output_filename))
28
73
args.append(filename)
29
process = popen2.Popen3(args, bufsize=len(patch_contents))
30
process.tochild.write(patch_contents)
31
process.tochild.close()
32
status = os.WEXITSTATUS(process.wait())
36
def diff(orig_file, mod_str, orig_label=None, mod_label=None):
37
"""Compare two files, and produce a patch.
39
:param orig_file: path to the old file
41
:param mod_str: Contents of the new file
43
:param orig_label: The label to use for the old file
45
:param mod_label: The label to use for the new file
48
args = ["diff", "-u" ]
49
if orig_label is not None and mod_label is not None:
50
args.extend(("-L", orig_label, "-L", mod_label))
51
args.extend(("--", orig_file, "-"))
52
process = popen2.Popen3(args, bufsize=len(mod_str))
53
process.tochild.write(mod_str)
54
process.tochild.close()
55
patch = process.fromchild.read()
56
status = os.WEXITSTATUS(process.wait())
74
stdout, stderr, status = write_to_cmd(args, patch_contents)
62
78
def diff3(out_file, mine_path, older_path, yours_path):
63
79
def add_label(args, label):
64
80
args.extend(("-L", label))
81
check_text_path(mine_path)
82
check_text_path(older_path)
83
check_text_path(yours_path)
65
84
args = ['diff3', "-E", "--merge"]
66
85
add_label(args, "TREE")
67
86
add_label(args, "ANCESTOR")
68
87
add_label(args, "MERGE-SOURCE")
69
88
args.extend((mine_path, older_path, yours_path))
70
process = popen2.Popen4(args)
71
process.tochild.close()
72
output = process.fromchild.read()
73
status = os.WEXITSTATUS(process.wait())
90
output, stderr, status = write_to_cmd(args)
92
if e.errno == errno.ENOENT:
74
96
if status not in (0, 1):
75
raise Exception(output)
76
file(out_file, "wb").write(output)
97
raise Exception(stderr)
98
f = open(out_file, 'wb')