mirror of
https://bitbucket.org/chromiumembedded/cef
synced 2024-12-15 19:09:00 +01:00
f30fbb3d48
git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@971 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
594 lines
18 KiB
Python
594 lines
18 KiB
Python
""" Patch utility to apply unified diffs """
|
|
""" Brute-force line-by-line parsing
|
|
|
|
Project home: http://code.google.com/p/python-patch/
|
|
|
|
This file is subject to the MIT license available here:
|
|
http://www.opensource.org/licenses/mit-license.php
|
|
|
|
CEF Changes
|
|
-----------
|
|
|
|
2013/01/03
|
|
- Add support for patches containing new files
|
|
|
|
2009/07/22
|
|
- Add a 'root_directory' argument to PatchInfo::apply
|
|
- Fix a Python 2.4 compile error in PatchInfo::parse_stream
|
|
|
|
"""
|
|
|
|
__author__ = "techtonik.rainforce.org"
|
|
__version__ = "8.12-1"
|
|
|
|
import copy
|
|
import logging
|
|
import os
|
|
import re
|
|
from stat import *
|
|
# cStringIO doesn't support unicode in 2.5
|
|
from StringIO import StringIO
|
|
from logging import debug, info, warning
|
|
|
|
from os.path import exists, isfile
|
|
from os import unlink
|
|
|
|
debugmode = False
|
|
|
|
|
|
def from_file(filename):
|
|
""" read and parse patch file
|
|
return PatchInfo() object
|
|
"""
|
|
|
|
info("reading patch from file %s" % filename)
|
|
fp = open(filename, "rb")
|
|
patch = PatchInfo(fp)
|
|
fp.close()
|
|
return patch
|
|
|
|
|
|
def from_string(s):
|
|
""" parse text string and return PatchInfo() object """
|
|
return PatchInfo(
|
|
StringIO.StringIO(s)
|
|
)
|
|
|
|
|
|
class HunkInfo(object):
|
|
""" parsed hunk data (hunk starts with @@ -R +R @@) """
|
|
|
|
def __init__(self):
|
|
# define HunkInfo data members
|
|
self.startsrc=None
|
|
self.linessrc=None
|
|
self.starttgt=None
|
|
self.linestgt=None
|
|
self.invalid=False
|
|
self.text=[]
|
|
|
|
def copy(self):
|
|
return copy.copy(self)
|
|
|
|
# def apply(self, estream):
|
|
# """ write hunk data into enumerable stream
|
|
# return strings one by one until hunk is
|
|
# over
|
|
#
|
|
# enumerable stream are tuples (lineno, line)
|
|
# where lineno starts with 0
|
|
# """
|
|
# pass
|
|
|
|
|
|
|
|
|
|
class PatchInfo(object):
|
|
""" patch information container """
|
|
|
|
def __init__(self, stream=None):
|
|
""" parse incoming stream """
|
|
|
|
# define PatchInfo data members
|
|
# table with a row for every source file
|
|
|
|
#: list of source filenames
|
|
self.source=None
|
|
self.target=None
|
|
#: list of lists of hunks
|
|
self.hunks=None
|
|
#: file endings statistics for every hunk
|
|
self.hunkends=None
|
|
|
|
if stream:
|
|
self.parse_stream(stream)
|
|
|
|
def copy(self):
|
|
return copy.copy(self)
|
|
|
|
def parse_stream(self, stream):
|
|
""" parse unified diff """
|
|
self.source = []
|
|
self.target = []
|
|
self.hunks = []
|
|
self.hunkends = []
|
|
|
|
# define possible file regions that will direct the parser flow
|
|
header = False # comments before the patch body
|
|
filenames = False # lines starting with --- and +++
|
|
|
|
hunkhead = False # @@ -R +R @@ sequence
|
|
hunkbody = False #
|
|
hunkskip = False # skipping invalid hunk mode
|
|
|
|
header = True
|
|
lineends = dict(lf=0, crlf=0, cr=0)
|
|
nextfileno = 0
|
|
nexthunkno = 0 #: even if index starts with 0 user messages number hunks from 1
|
|
|
|
# hunkinfo holds parsed values, hunkactual - calculated
|
|
hunkinfo = HunkInfo()
|
|
hunkactual = dict(linessrc=None, linestgt=None)
|
|
|
|
fe = enumerate(stream)
|
|
for lineno, line in fe:
|
|
|
|
# analyze state
|
|
if header and line.startswith("--- "):
|
|
header = False
|
|
# switch to filenames state
|
|
filenames = True
|
|
#: skip hunkskip and hunkbody code until you read definition of hunkhead
|
|
if hunkbody:
|
|
# process line first
|
|
if re.match(r"^[- \+\\]", line):
|
|
# gather stats about line endings
|
|
if line.endswith("\r\n"):
|
|
self.hunkends[nextfileno-1]["crlf"] += 1
|
|
elif line.endswith("\n"):
|
|
self.hunkends[nextfileno-1]["lf"] += 1
|
|
elif line.endswith("\r"):
|
|
self.hunkends[nextfileno-1]["cr"] += 1
|
|
|
|
if line.startswith("-"):
|
|
hunkactual["linessrc"] += 1
|
|
elif line.startswith("+"):
|
|
hunkactual["linestgt"] += 1
|
|
elif not line.startswith("\\"):
|
|
hunkactual["linessrc"] += 1
|
|
hunkactual["linestgt"] += 1
|
|
hunkinfo.text.append(line)
|
|
# todo: handle \ No newline cases
|
|
else:
|
|
warning("invalid hunk no.%d at %d for target file %s" % (nexthunkno, lineno+1, self.target[nextfileno-1]))
|
|
# add hunk status node
|
|
self.hunks[nextfileno-1].append(hunkinfo.copy())
|
|
self.hunks[nextfileno-1][nexthunkno-1]["invalid"] = True
|
|
# switch to hunkskip state
|
|
hunkbody = False
|
|
hunkskip = True
|
|
|
|
# check exit conditions
|
|
if hunkactual["linessrc"] > hunkinfo.linessrc or hunkactual["linestgt"] > hunkinfo.linestgt:
|
|
warning("extra hunk no.%d lines at %d for target %s" % (nexthunkno, lineno+1, self.target[nextfileno-1]))
|
|
# add hunk status node
|
|
self.hunks[nextfileno-1].append(hunkinfo.copy())
|
|
self.hunks[nextfileno-1][nexthunkno-1]["invalid"] = True
|
|
# switch to hunkskip state
|
|
hunkbody = False
|
|
hunkskip = True
|
|
elif hunkinfo.linessrc == hunkactual["linessrc"] and hunkinfo.linestgt == hunkactual["linestgt"]:
|
|
self.hunks[nextfileno-1].append(hunkinfo.copy())
|
|
# switch to hunkskip state
|
|
hunkbody = False
|
|
hunkskip = True
|
|
|
|
# detect mixed window/unix line ends
|
|
ends = self.hunkends[nextfileno-1]
|
|
if ((ends["cr"]!=0) + (ends["crlf"]!=0) + (ends["lf"]!=0)) > 1:
|
|
warning("inconsistent line ends in patch hunks for %s" % self.source[nextfileno-1])
|
|
if debugmode:
|
|
debuglines = dict(ends)
|
|
debuglines.update(file=self.target[nextfileno-1], hunk=nexthunkno)
|
|
debug("crlf: %(crlf)d lf: %(lf)d cr: %(cr)d\t - file: %(file)s hunk: %(hunk)d" % debuglines)
|
|
|
|
if hunkskip:
|
|
match = re.match("^@@ -(\d+)(,(\d+))? \+(\d+)(,(\d+))?", line)
|
|
if match:
|
|
# switch to hunkhead state
|
|
hunkskip = False
|
|
hunkhead = True
|
|
elif line.startswith("--- "):
|
|
# switch to filenames state
|
|
hunkskip = False
|
|
filenames = True
|
|
if debugmode and len(self.source) > 0:
|
|
debug("- %2d hunks for %s" % (len(self.hunks[nextfileno-1]), self.source[nextfileno-1]))
|
|
|
|
if filenames:
|
|
if line.startswith("--- "):
|
|
if nextfileno in self.source:
|
|
warning("skipping invalid patch for %s" % self.source[nextfileno])
|
|
del self.source[nextfileno]
|
|
# double source filename line is encountered
|
|
# attempt to restart from this second line
|
|
re_filename = "^--- ([^\t]+)"
|
|
match = re.match(re_filename, line)
|
|
if not match:
|
|
warning("skipping invalid filename at line %d" % lineno)
|
|
# switch back to header state
|
|
filenames = False
|
|
header = True
|
|
else:
|
|
self.source.append(match.group(1))
|
|
elif not line.startswith("+++ "):
|
|
if nextfileno in self.source:
|
|
warning("skipping invalid patch with no target for %s" % self.source[nextfileno])
|
|
del self.source[nextfileno]
|
|
else:
|
|
# this should be unreachable
|
|
warning("skipping invalid target patch")
|
|
filenames = False
|
|
header = True
|
|
else:
|
|
if nextfileno in self.target:
|
|
warning("skipping invalid patch - double target at line %d" % lineno)
|
|
del self.source[nextfileno]
|
|
del self.target[nextfileno]
|
|
nextfileno -= 1
|
|
# double target filename line is encountered
|
|
# switch back to header state
|
|
filenames = False
|
|
header = True
|
|
else:
|
|
re_filename = "^\+\+\+ ([^\t]+)"
|
|
match = re.match(re_filename, line)
|
|
if not match:
|
|
warning("skipping invalid patch - no target filename at line %d" % lineno)
|
|
# switch back to header state
|
|
filenames = False
|
|
header = True
|
|
else:
|
|
self.target.append(match.group(1))
|
|
nextfileno += 1
|
|
# switch to hunkhead state
|
|
filenames = False
|
|
hunkhead = True
|
|
nexthunkno = 0
|
|
self.hunks.append([])
|
|
self.hunkends.append(lineends.copy())
|
|
continue
|
|
|
|
|
|
if hunkhead:
|
|
match = re.match("^@@ -(\d+)(,(\d+))? \+(\d+)(,(\d+))?", line)
|
|
if not match:
|
|
if nextfileno-1 not in self.hunks:
|
|
warning("skipping invalid patch with no hunks for file %s" % self.target[nextfileno-1])
|
|
# switch to header state
|
|
hunkhead = False
|
|
header = True
|
|
continue
|
|
else:
|
|
# switch to header state
|
|
hunkhead = False
|
|
header = True
|
|
else:
|
|
hunkinfo.startsrc = int(match.group(1))
|
|
if match.group(3):
|
|
hunkinfo.linessrc = int(match.group(3))
|
|
else:
|
|
hunkinfo.linessrc = 1
|
|
hunkinfo.starttgt = int(match.group(4))
|
|
if match.group(6):
|
|
hunkinfo.linestgt = int(match.group(6))
|
|
else:
|
|
hunkinfo.linestgt = 1
|
|
hunkinfo.invalid = False
|
|
hunkinfo.text = []
|
|
|
|
hunkactual["linessrc"] = hunkactual["linestgt"] = 0
|
|
|
|
# switch to hunkbody state
|
|
hunkhead = False
|
|
hunkbody = True
|
|
nexthunkno += 1
|
|
continue
|
|
else:
|
|
if not hunkskip:
|
|
warning("patch file incomplete - %s" % filename)
|
|
# sys.exit(?)
|
|
else:
|
|
# duplicated message when an eof is reached
|
|
if debugmode and len(self.source) > 0:
|
|
debug("- %2d hunks for %s" % (len(self.hunks[nextfileno-1]), self.source[nextfileno-1]))
|
|
|
|
info("total files: %d total hunks: %d" % (len(self.source), sum(len(hset) for hset in self.hunks)))
|
|
|
|
def apply(self, root_directory = None):
|
|
""" apply parsed patch """
|
|
|
|
total = len(self.source)
|
|
for fileno, filename in enumerate(self.source):
|
|
|
|
f2patch = filename
|
|
if not root_directory is None:
|
|
f2patch = root_directory + f2patch
|
|
if not exists(f2patch):
|
|
# if the patch contains a single hunk at position 0 consider it a new file
|
|
if len(self.hunks[fileno]) == 1 and self.hunks[fileno][0].startsrc == 0:
|
|
hunklines = [x[1:].rstrip("\r\n") for x in self.hunks[fileno][0].text if x[0] in " +"]
|
|
if len(hunklines) > 0:
|
|
warning("creating file %s" % (f2patch))
|
|
f = open(f2patch, "wb")
|
|
for line in hunklines:
|
|
f.write(line + "\n")
|
|
f.close()
|
|
continue
|
|
|
|
f2patch = self.target[fileno]
|
|
if not exists(f2patch):
|
|
warning("source/target file does not exist\n--- %s\n+++ %s" % (filename, f2patch))
|
|
continue
|
|
if not isfile(f2patch):
|
|
warning("not a file - %s" % f2patch)
|
|
continue
|
|
filename = f2patch
|
|
|
|
info("processing %d/%d:\t %s" % (fileno+1, total, filename))
|
|
|
|
# validate before patching
|
|
f2fp = open(filename)
|
|
hunkno = 0
|
|
hunk = self.hunks[fileno][hunkno]
|
|
hunkfind = []
|
|
hunkreplace = []
|
|
validhunks = 0
|
|
canpatch = False
|
|
for lineno, line in enumerate(f2fp):
|
|
if lineno+1 < hunk.startsrc:
|
|
continue
|
|
elif lineno+1 == hunk.startsrc:
|
|
hunkfind = [x[1:].rstrip("\r\n") for x in hunk.text if x[0] in " -"]
|
|
hunkreplace = [x[1:].rstrip("\r\n") for x in hunk.text if x[0] in " +"]
|
|
#pprint(hunkreplace)
|
|
hunklineno = 0
|
|
|
|
# todo \ No newline at end of file
|
|
|
|
# check hunks in source file
|
|
if lineno+1 < hunk.startsrc+len(hunkfind)-1:
|
|
if line.rstrip("\r\n") == hunkfind[hunklineno]:
|
|
hunklineno+=1
|
|
else:
|
|
debug("hunk no.%d doesn't match source file %s" % (hunkno+1, filename))
|
|
# file may be already patched, but we will check other hunks anyway
|
|
hunkno += 1
|
|
if hunkno < len(self.hunks[fileno]):
|
|
hunk = self.hunks[fileno][hunkno]
|
|
continue
|
|
else:
|
|
break
|
|
|
|
# check if processed line is the last line
|
|
if lineno+1 == hunk.startsrc+len(hunkfind)-1:
|
|
debug("file %s hunk no.%d -- is ready to be patched" % (filename, hunkno+1))
|
|
hunkno+=1
|
|
validhunks+=1
|
|
if hunkno < len(self.hunks[fileno]):
|
|
hunk = self.hunks[fileno][hunkno]
|
|
else:
|
|
if validhunks == len(self.hunks[fileno]):
|
|
# patch file
|
|
canpatch = True
|
|
break
|
|
else:
|
|
if hunkno < len(self.hunks[fileno]) and \
|
|
(len(self.hunks[fileno]) != 1 or self.hunks[fileno][0].startsrc != 0):
|
|
warning("premature end of source file %s at hunk %d" % (filename, hunkno+1))
|
|
|
|
f2fp.close()
|
|
|
|
if validhunks < len(self.hunks[fileno]):
|
|
if check_patched(filename, self.hunks[fileno]):
|
|
warning("already patched %s" % filename)
|
|
else:
|
|
warning("source file is different - %s" % filename)
|
|
if canpatch:
|
|
backupname = filename+".orig"
|
|
if exists(backupname):
|
|
warning("can't backup original file to %s - aborting" % backupname)
|
|
else:
|
|
import shutil
|
|
shutil.move(filename, backupname)
|
|
if patch_hunks(backupname, filename, self.hunks[fileno]):
|
|
warning("successfully patched %s" % filename)
|
|
unlink(backupname)
|
|
else:
|
|
warning("error patching file %s" % filename)
|
|
shutil.copy(filename, filename+".invalid")
|
|
warning("invalid version is saved to %s" % filename+".invalid")
|
|
# todo: proper rejects
|
|
shutil.move(backupname, filename)
|
|
|
|
# todo: check for premature eof
|
|
|
|
|
|
|
|
def check_patched(filename, hunks):
|
|
matched = True
|
|
fp = open(filename)
|
|
|
|
class NoMatch(Exception):
|
|
pass
|
|
|
|
# special case for new files
|
|
try:
|
|
if len(hunks) == 1 and hunks[0].startsrc == 0:
|
|
hunklines = [x[1:].rstrip("\r\n") for x in hunks[0].text if x[0] in " +"]
|
|
if len(hunklines) > 0:
|
|
for line in hunklines:
|
|
srcline = fp.readline()
|
|
if not len(srcline) or srcline.rstrip("\r\n") != line:
|
|
raise NoMatch
|
|
srcline = fp.readline()
|
|
if len(srcline):
|
|
raise NoMatch
|
|
fp.close()
|
|
return True
|
|
except NoMatch:
|
|
fp.close()
|
|
fp = open(filename)
|
|
|
|
lineno = 1
|
|
line = fp.readline()
|
|
hno = None
|
|
try:
|
|
if not len(line):
|
|
raise NoMatch
|
|
for hno, h in enumerate(hunks):
|
|
# skip to line just before hunk starts
|
|
while lineno < h.starttgt-1:
|
|
line = fp.readline()
|
|
lineno += 1
|
|
if not len(line):
|
|
raise NoMatch
|
|
for hline in h.text:
|
|
# todo: \ No newline at the end of file
|
|
if not hline.startswith("-") and not hline.startswith("\\"):
|
|
line = fp.readline()
|
|
lineno += 1
|
|
if not len(line):
|
|
raise NoMatch
|
|
if line.rstrip("\r\n") != hline[1:].rstrip("\r\n"):
|
|
warning("file is not patched - failed hunk: %d" % (hno+1))
|
|
raise NoMatch
|
|
except NoMatch:
|
|
matched = False
|
|
# todo: display failed hunk, i.e. expected/found
|
|
|
|
fp.close()
|
|
return matched
|
|
|
|
|
|
|
|
def patch_stream(instream, hunks):
|
|
""" given a source stream and hunks iterable, yield patched stream
|
|
|
|
converts lineends in hunk lines to the best suitable format
|
|
autodetected from input
|
|
"""
|
|
|
|
# todo: At the moment substituted lineends may not be the same
|
|
# at the start and at the end of patching. Also issue a
|
|
# warning/throw about mixed lineends (is it really needed?)
|
|
|
|
hunks = iter(hunks)
|
|
|
|
srclineno = 1
|
|
|
|
lineends = {'\n':0, '\r\n':0, '\r':0}
|
|
def get_line():
|
|
"""
|
|
local utility function - return line from source stream
|
|
collecting line end statistics on the way
|
|
"""
|
|
line = instream.readline()
|
|
# 'U' mode works only with text files
|
|
if line.endswith("\r\n"):
|
|
lineends["\r\n"] += 1
|
|
elif line.endswith("\n"):
|
|
lineends["\n"] += 1
|
|
elif line.endswith("\r"):
|
|
lineends["\r"] += 1
|
|
return line
|
|
|
|
|
|
for hno, h in enumerate(hunks):
|
|
debug("hunk %d" % (hno+1))
|
|
# skip to line just before hunk starts
|
|
while srclineno < h.startsrc:
|
|
yield get_line()
|
|
srclineno += 1
|
|
|
|
for hline in h.text:
|
|
# todo: check \ No newline at the end of file
|
|
if hline.startswith("-") or hline.startswith("\\"):
|
|
get_line()
|
|
srclineno += 1
|
|
continue
|
|
else:
|
|
if not hline.startswith("+"):
|
|
get_line()
|
|
srclineno += 1
|
|
line2write = hline[1:]
|
|
# detect if line ends are consistent in source file
|
|
if sum([bool(lineends[x]) for x in lineends]) == 1:
|
|
newline = [x for x in lineends if lineends[x] != 0][0]
|
|
yield line2write.rstrip("\r\n")+newline
|
|
else: # newlines are mixed
|
|
yield line2write
|
|
|
|
for line in instream:
|
|
yield line
|
|
|
|
|
|
|
|
def patch_hunks(srcname, tgtname, hunks):
|
|
# get the current file mode
|
|
mode = os.stat(srcname)[ST_MODE]
|
|
|
|
src = open(srcname, "rb")
|
|
tgt = open(tgtname, "wb")
|
|
|
|
debug("processing target file %s" % tgtname)
|
|
|
|
tgt.writelines(patch_stream(src, hunks))
|
|
|
|
tgt.close()
|
|
src.close()
|
|
|
|
# restore the file mode
|
|
os.chmod(tgtname, mode)
|
|
|
|
return True
|
|
|
|
|
|
|
|
|
|
|
|
|
|
from optparse import OptionParser
|
|
from os.path import exists
|
|
import sys
|
|
|
|
if __name__ == "__main__":
|
|
opt = OptionParser(usage="%prog [options] unipatch-file", version="python-patch %s" % __version__)
|
|
opt.add_option("-d", action="store_true", dest="debugmode", help="debug mode")
|
|
(options, args) = opt.parse_args()
|
|
|
|
if not args:
|
|
opt.print_version()
|
|
print("")
|
|
opt.print_help()
|
|
sys.exit()
|
|
debugmode = options.debugmode
|
|
patchfile = args[0]
|
|
if not exists(patchfile) or not isfile(patchfile):
|
|
sys.exit("patch file does not exist - %s" % patchfile)
|
|
|
|
|
|
if debugmode:
|
|
logging.basicConfig(level=logging.DEBUG, format="%(levelname)8s %(message)s")
|
|
else:
|
|
logging.basicConfig(level=logging.INFO, format="%(message)s")
|
|
|
|
|
|
|
|
patch = from_file(patchfile)
|
|
#pprint(patch)
|
|
patch.apply()
|
|
|
|
# todo: document and test line ends handling logic - patch.py detects proper line-endings
|
|
# for inserted hunks and issues a warning if patched file has incosistent line ends
|