#!/usr/bin/python2
#
# Python functions to read, split and apply patches.
#
# Copyright (C) 2014-2017 Sebastian Lackner
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#
import collections
import difflib
import email.header
import hashlib
import itertools
import os
import re
import shutil
import stat
import subprocess
import sys
import tempfile
try:
from cStringIO import StringIO
except ImportError:
from io import StringIO
_devnull = open(os.devnull, 'wb')
class PatchParserError(RuntimeError):
"""Unable to parse patch file - either an unimplemented feature, or corrupted patch."""
pass
class PatchApplyError(RuntimeError):
"""Failed to apply/merge patch."""
pass
class PatchDiffError(RuntimeError):
"""Failed to compute diff."""
pass
class CParserError(RuntimeError):
"""Unable to parse C source."""
pass
class PatchObject(object):
def __init__(self, filename, header):
self.patch_author = header.get('author', None)
self.patch_email = header.get('email', None)
self.patch_subject = header.get('subject', None)
self.patch_revision = header.get('revision', 1)
self.signed_off_by = header.get('signedoffby', [])
self.filename = filename
self.offset_begin = None
self.offset_end = None
self.is_binary = False
self.oldname = None
self.newname = None
self.modified_file = None
self.oldsha1 = None
self.newsha1 = None
self.newmode = None
def read_chunks(self):
"""Iterates over arbitrary sized chunks of this patch."""
assert self.offset_end >= self.offset_begin
with open(self.filename) as fp:
fp.seek(self.offset_begin)
i = self.offset_end - self.offset_begin
while i > 0:
buf = fp.read(16384 if i > 16384 else i)
if buf == "": raise IOError("Unable to extract patch.")
yield buf
i -= len(buf)
def read(self):
"""Return the full patch as a string."""
return "".join(chunk for chunk in self.read_chunks())
class _PatchReader(object):
def __init__(self, filename, fp=None):
self.filename = filename
self.fp = fp if fp is not None else open(filename)
self.peeked = None
def close(self):
self.fp.close()
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.close()
def seek(self, pos):
"""Change the file cursor position."""
self.fp.seek(pos)
self.peeked = None
def tell(self):
"""Return the current file cursor position."""
if self.peeked is None:
return self.fp.tell()
return self.peeked[0]
def peek(self):
"""Read one line without changing the file cursor."""
if self.peeked is None:
pos = self.fp.tell()
tmp = self.fp.readline()
if len(tmp) == 0: return None
self.peeked = (pos, tmp)
return self.peeked[1]
def read(self):
"""Read one line from the file, and move the file cursor to the next line."""
if self.peeked is None:
tmp = self.fp.readline()
if len(tmp) == 0: return None
return tmp
tmp, self.peeked = self.peeked, None
return tmp[1]
def read_multiline(self):
"""Read multiline data from a patch file."""
line = self.read().rstrip("\r\n")
while True:
tmp = self.peek()
if not tmp.startswith(" "): break
line += tmp.rstrip("\r\n")
self.read()
return line
def read_hunk(self):
"""Read one hunk from a patch file."""
line = self.peek()
if line is None or not line.startswith("@@ -"):
return None
r = re.match("^@@ -([0-9]+)(,([0-9]+))? \+([0-9]+)(,([0-9]+))? @@", line)
if not r: raise PatchParserError("Unable to parse hunk header '%s'." % line)
srcpos = max(int(r.group(1)) - 1, 0)
dstpos = max(int(r.group(4)) - 1, 0)
srclines = int(r.group(3)) if r.group(3) else 1
dstlines = int(r.group(6)) if r.group(6) else 1
if srclines <= 0 and dstlines <= 0:
raise PatchParserError("Empty hunk doesn't make sense.")
self.read()
srcdata = []
dstdata = []
try:
while srclines > 0 or dstlines > 0:
line = self.read().rstrip("\n")
if line[0] == " ":
if srclines == 0 or dstlines == 0:
raise PatchParserError("Corrupted patch.")
srcdata.append(line[1:])
dstdata.append(line[1:])
srclines -= 1
dstlines -= 1
elif line[0] == "-":
if srclines == 0:
raise PatchParserError("Corrupted patch.")
srcdata.append(line[1:])
srclines -= 1
elif line[0] == "+":
if dstlines == 0:
raise PatchParserError("Corrupted patch.")
dstdata.append(line[1:])
dstlines -= 1
elif line[0] == "\\":
pass # ignore
else:
raise PatchParserError("Unexpected line in hunk.")
except IndexError: # triggered by ""[0]
raise PatchParserError("Truncated patch.")
while True:
line = self.peek()
if line is None or not line.startswith("\\ "): break
self.read()
return (srcpos, srcdata, dstpos, dstdata)
def _read_single_patch(fp, header, oldname=None, newname=None):
"""Internal function to read a single patch from a file."""
patch = PatchObject(fp.filename, header)
patch.offset_begin = fp.tell()
patch.oldname = oldname
patch.newname = newname
# Skip over initial diff --git header
line = fp.peek()
if line.startswith("diff --git "):
fp.read()
# Read header
while True:
line = fp.peek()
if line is None:
break
elif line.startswith("--- "):
patch.oldname = line[4:].strip()
elif line.startswith("+++ "):
patch.newname = line[4:].strip()
elif line.startswith("old mode") or line.startswith("deleted file mode"):
pass # ignore
elif line.startswith("new mode "):
patch.newmode = line[9:].strip()
elif line.startswith("new file mode "):
patch.newmode = line[14:].strip()
elif line.startswith("new mode") or line.startswith("new file mode"):
raise PatchParserError("Unable to parse header line '%s'." % line)
elif line.startswith("copy from") or line.startswith("copy to"):
raise NotImplementedError("Patch copy header not implemented yet.")
elif line.startswith("rename "):
raise NotImplementedError("Patch rename header not implemented yet.")
elif line.startswith("similarity index") or line.startswith("dissimilarity index"):
pass # ignore
elif line.startswith("index "):
r = re.match("^index ([a-fA-F0-9]*)\.\.([a-fA-F0-9]*)", line)
if not r: raise PatchParserError("Unable to parse index header line '%s'." % line)
patch.oldsha1, patch.newsha1 = r.group(1), r.group(2)
else:
break
fp.read()
if patch.oldname is None or patch.newname is None:
raise PatchParserError("Missing old or new name.")
elif patch.oldname == "/dev/null" and patch.newname == "/dev/null":
raise PatchParserError("Old and new name is /dev/null?")
if patch.oldname.startswith("a/"):
patch.oldname = patch.oldname[2:]
elif patch.oldname != "/dev/null":
raise PatchParserError("Old name in patch doesn't start with a/.")
if patch.newname.startswith("b/"):
patch.newname = patch.newname[2:]
elif patch.newname != "/dev/null":
raise PatchParserError("New name in patch doesn't start with b/.")
if patch.newname != "/dev/null":
patch.modified_file = patch.newname
else:
patch.modified_file = patch.oldname
# Decide between binary and textual patch
if line is None or line.startswith("diff --git ") or line.startswith("--- "):
if oldname != newname:
raise PatchParserError("Stripped old- and new name doesn't match.")
elif line.startswith("@@ -"):
while fp.read_hunk() is not None:
pass
elif line.rstrip() == "GIT binary patch":
if patch.oldsha1 is None or patch.newsha1 is None:
raise PatchParserError("Missing index header, sha1 sums required for binary patch.")
elif patch.oldname != patch.newname:
raise PatchParserError("Stripped old- and new name doesn't match for binary patch.")
fp.read()
line = fp.read()
if line is None: raise PatchParserError("Unexpected end of file.")
r = re.match("^(literal|delta) ([0-9]+)", line)
if not r: raise NotImplementedError("Only literal/delta patches are supported.")
patch.is_binary = True
# Skip over patch data
while True:
line = fp.read()
if line is None or line.strip() == "":
break
else:
raise PatchParserError("Unknown patch format.")
patch.offset_end = fp.tell()
return patch
def _parse_author(author):
if sys.version_info[0] > 2:
author = str(email.header.make_header(email.header.decode_header(author)))
else:
author = ' '.join([data.decode(format or 'utf-8').encode('utf-8') for \
data, format in email.header.decode_header(author)])
r = re.match("\"?([^\"]*)\"? <(.*)>", author)
if r is None: raise NotImplementedError("Failed to parse From - header.")
return r.group(1).strip(), r.group(2).strip()
def _parse_subject(subject):
version = "(v|try|rev|take) *([0-9]+)"
subject = subject.strip()
if subject.endswith("."): subject = subject[:-1]
r = re.match("^\\[PATCH([^]]*)\\](.*)$", subject, re.IGNORECASE)
if r is not None:
subject = r.group(2).strip()
r = re.search(version, r.group(1), re.IGNORECASE)
if r is not None: return subject, int(r.group(2))
r = re.match("^(.*)\\(%s\\)$" % version, subject, re.IGNORECASE)
if r is not None: return r.group(1).strip(), int(r.group(3))
r = re.match("^(.*)\\[%s\\]$" % version, subject, re.IGNORECASE)
if r is not None: return r.group(1).strip(), int(r.group(3))
r = re.match("^(.*)[.,] +%s$" % version, subject, re.IGNORECASE)
if r is not None: return r.group(1).strip(), int(r.group(3))
r = re.match("^([^:]+) %s: (.*)$" % version, subject, re.IGNORECASE)
if r is not None: return "%s: %s" % (r.group(1), r.group(4)), int(r.group(3))
r = re.match("^(.*) +%s$" % version, subject, re.IGNORECASE)
if r is not None: return r.group(1).strip(), int(r.group(3))
r = re.match("^(.*)\\(resend\\)$", subject, re.IGNORECASE)
if r is not None: return r.group(1).strip(), 1
return subject, 1
def read_patch(filename, fp=None):
"""Iterates over all patches contained in a file, and returns PatchObject objects."""
header = {}
with _PatchReader(filename, fp) as fp:
while True:
line = fp.peek()
if line is None:
break
elif line.startswith("From: "):
author = fp.read_multiline()[6:]
header['author'], header['email'] = _parse_author(author)
header.pop('signedoffby', None)
elif line.startswith("Subject: "):
subject = fp.read_multiline()[9:]
subject, revision = _parse_subject(subject)
if not subject.endswith("."): subject += "."
subject = re.sub('^([^:]*: *)([a-z])', lambda x: "%s%s" %
(x.group(1), x.group(2).upper()), subject, 1)
header['subject'], header['revision'] = subject, revision
header.pop('signedoffby', None)
elif line.startswith("Signed-off-by: "):
if 'signedoffby' not in header:
header['signedoffby'] = []
header['signedoffby'].append(_parse_author(line[15:]))
fp.read()
elif line.startswith("diff --git "):
tmp = line.strip().split(" ")
if len(tmp) != 4: raise PatchParserError("Unable to parse git diff header line '%s'." % line)
yield _read_single_patch(fp, header, tmp[2].strip(), tmp[3].strip())
elif line.startswith("--- "):
yield _read_single_patch(fp, header)
elif line.startswith("@@ -") or line.startswith("+++ "):
raise PatchParserError("Patch didn't start with a git or diff header.")
else:
fp.read()
def apply_patch(original, patchfile, reverse=False, fuzz=2):
"""Apply a patch with optional fuzz - uses the commandline 'patch' utility."""
result = tempfile.NamedTemporaryFile(mode='w+', delete=False)
try:
# We open the file again to avoid race-conditions with multithreaded reads
with open(original.name) as fp:
shutil.copyfileobj(fp, result)
result.close()
cmdline = ["patch", "--no-backup-if-mismatch", "--force", "--silent", "-r", "-"]
if reverse: cmdline.append("--reverse")
if fuzz != 2: cmdline.append("--fuzz=%d" % fuzz)
cmdline += [result.name, patchfile.name]
exitcode = subprocess.call(cmdline, stdout=_devnull, stderr=_devnull)
if exitcode != 0:
raise PatchApplyError("Failed to apply patch (exitcode %d)." % exitcode)
# Hack - we can't keep the file open while patching ('patch' might rename/replace
# the file), so create a new _TemporaryFileWrapper object for the existing path.
return tempfile._TemporaryFileWrapper(file=open(result.name, 'r+'), \
name=result.name, delete=True)
except:
os.unlink(result.name)
raise
def _preprocess_source(fp):
"""Simple C preprocessor to determine where we can safely add #ifdef instructions."""
_re_state0 = re.compile("(\"|/[/*])")
_re_state1 = re.compile("(\\\\\"|\\\\\\\\|\")")
_re_state2 = re.compile("\\*/")
# We need to read the original file, and figure out where lines can be splitted
lines = []
for line in fp:
lines.append(line.rstrip("\n"))
split = set([0])
state = 0
i = 0
while i < len(lines):
# Read a full line (and handle line continuation)
line = lines[i]
i += 1
while line.endswith("\\"):
if i >= len(lines):
raise CParserError("Unexpected end of file.")
line = line[:-1] + lines[i]
i += 1
# To find out where we can add our #ifdef tags we use a simple
# statemachine. This allows finding the beginning of a multiline
# instruction or comment.
j = 0
while True:
# State 0: No context
if state == 0:
match = _re_state0.search(line, j)
if match is None: break
if match.group(0) == "\"":
state = 1 # Begin of string
elif match.group(0) == "/*":
state = 2 # Begin of comment
elif match.group(0) == "//":
break # Rest of the line is a comment, which can be safely ignored
else:
assert 0
# State 1: Inside of string
elif state == 1:
match = _re_state1.search(line, j)
if match is None:
raise CParserError("Line ended in the middle of a string.")
if match.group(0) == "\"":
state = 0 # End of string
elif match.group(0) != "\\\"" and match.group(0) != "\\\\":
assert 0
# State 2: Multiline comment
elif state == 2:
match = _re_state2.search(line, j)
if match is None: break
if match.group(0) == "*/":
state = 0 # End of comment
else:
assert 0
else:
raise CParserError("Internal state error.")
j = match.end()
# Only in state 0 (no context) we can split here
if state == 0:
split.add(i)
# Ensure that the last comment is properly terminated
if state != 0:
raise CParserError("Unexpected end of file.")
return lines, split
def generate_ifdef_patch(original, patched, ifdef):
"""Generate a patch which adds #ifdef where necessary to keep both the original and patched version."""
#
# The basic of idea of this algorithm is as following:
#
# (1) determine diff between original file and patched file
# (2) run the preprocessor, to determine where #ifdefs can be safely added
# (3) use diff and preprocessor information to create a merged version containing #ifdefs
# (4) create another diff to apply the changes on the patched version
#
with tempfile.NamedTemporaryFile(mode='w+') as diff:
exitcode = subprocess.call(["git", "diff", "--no-index", "--minimal", "-U1", original.name, patched.name],
stdout=diff, stderr=_devnull)
if exitcode == 0:
return None
elif exitcode != 1:
raise PatchDiffError("Failed to compute diff (exitcode %d)." % exitcode)
# Preprocess the original C source
original.seek(0)
lines, split = _preprocess_source(original)
# Parse the created diff file
fp = _PatchReader(diff.name, diff)
fp.seek(0)
# We expect this output format from 'git diff', if this is not the case things might go wrong.
line = fp.read()
assert line.startswith("diff --git ")
line = fp.read()
assert line.startswith("index ")
line = fp.read()
assert line.startswith("--- ")
line = fp.read()
assert line.startswith("+++ ")
hunks = []
while fp.peek() is not None:
srcpos, srcdata, dstpos, dstdata = fp.read_hunk()
# Ensure that the patch would really apply in practice
if lines[srcpos:srcpos + len(srcdata)] != srcdata:
raise PatchParserError("Patch failed to apply.")
# Strip common lines from the beginning and end
while len(srcdata) > 0 and len(dstdata) > 0 and \
srcdata[0] == dstdata[0]:
srcdata.pop(0)
dstdata.pop(0)
srcpos += 1
dstpos += 1
while len(srcdata) > 0 and len(dstdata) > 0 and \
srcdata[-1] == dstdata[-1]:
srcdata.pop()
dstdata.pop()
# Ensure that diff generated valid output
assert len(srcdata) > 0 or len(dstdata) > 0
# If this is the first hunk, then check if we have to extend it at the beginning
if len(hunks) == 0:
assert srcpos == dstpos
while srcpos > 0 and srcpos not in split:
srcpos -= 1
dstpos -= 1
srcdata.insert(0, lines[srcpos])
dstdata.insert(0, lines[srcpos])
hunks.append((srcpos, dstpos, srcdata, dstdata))
# Check if we can merge with the previous hunk
else:
prev_srcpos, prev_dstpos, prev_srcdata, prev_dstdata = hunks[-1]
prev_endpos = prev_srcpos + len(prev_srcdata)
found = 0
for i in xrange(prev_endpos, srcpos):
if i in split:
found += 1
# At least two possible splitting positions inbetween
if found >= 2:
while prev_endpos not in split:
prev_srcdata.append(lines[prev_endpos])
prev_dstdata.append(lines[prev_endpos])
prev_endpos += 1
while srcpos not in split:
srcpos -= 1
srcdata.insert(0, lines[srcpos])
dstdata.insert(0, lines[srcpos])
hunks.append((srcpos, dstpos, srcdata, dstdata))
# Merge hunks
else:
while prev_endpos < srcpos:
prev_srcdata.append(lines[prev_endpos])
prev_dstdata.append(lines[prev_endpos])
prev_endpos += 1
assert prev_dstpos + len(prev_dstdata) == dstpos
prev_srcdata.extend(srcdata)
prev_dstdata.extend(dstdata)
# Ready with this hunk
pass
# We might have to extend the last hunk
if len(hunks):
prev_srcpos, prev_dstpos, prev_srcdata, prev_dstdata = hunks[-1]
prev_endpos = prev_srcpos + len(prev_srcdata)
while prev_endpos < len(lines) and prev_endpos not in split:
prev_srcdata.append(lines[prev_endpos])
prev_dstdata.append(lines[prev_endpos])
prev_endpos += 1
# Generate resulting file with #ifdefs
with tempfile.NamedTemporaryFile(mode='w+') as intermediate:
pos = 0
while len(hunks):
srcpos, dstpos, srcdata, dstdata = hunks.pop(0)
if pos < srcpos:
intermediate.write("\n".join(lines[pos:srcpos]))
intermediate.write("\n")
if len(srcdata) and len(dstdata):
intermediate.write("#if !defined(%s)\n" % ifdef)
intermediate.write("\n".join(srcdata))
intermediate.write("\n#else /* %s */\n" % ifdef)
intermediate.write("\n".join(dstdata))
intermediate.write("\n#endif /* %s */\n" % ifdef)
elif len(srcdata):
intermediate.write("#if !defined(%s)\n" % ifdef)
intermediate.write("\n".join(srcdata))
intermediate.write("\n#endif /* %s */\n" % ifdef)
elif len(dstdata):
intermediate.write("#if defined(%s)\n" % ifdef)
intermediate.write("\n".join(dstdata))
intermediate.write("\n#endif /* %s */\n" % ifdef)
else:
assert 0
pos = srcpos + len(srcdata)
if pos < len(lines):
intermediate.write("\n".join(lines[pos:]))
intermediate.write("\n")
intermediate.flush()
# Now we can finally compute the diff between the original file and our intermediate file
diff = tempfile.NamedTemporaryFile(mode='w+')
exitcode = subprocess.call(["git", "diff", "--no-index", "--minimal", original.name, intermediate.name],
stdout=diff, stderr=_devnull)
if exitcode != 1: # exitcode 0 cannot (=shouldn't) happen in this situation
raise PatchDiffError("Failed to compute diff (exitcode %d)." % exitcode)
diff.flush()
diff.seek(0)
# We expect this output format from 'git diff', if this is not the case things might go wrong.
line = diff.readline()
assert line.startswith("diff --git ")
line = diff.readline()
assert line.startswith("index ")
line = diff.readline()
assert line.startswith("--- ")
line = diff.readline()
assert line.startswith("+++ ")
# Return the final diff
return diff
def escape_sh(text):
"""Escape string for usage in shell '...' quotes."""
return text.replace("'", "'\\''")
def escape_c(text):
"""Escape string for usage in C "..." quotes."""
return text.replace("\\", "\\\\").replace("\"", "\\\"")
if __name__ == "__main__":
import unittest
# Basic tests for _parse_author() and _parse_subject()
class PatchParserTests(unittest.TestCase):
def test_author(self):
author = _parse_author("Author Name <author@email.com>")
self.assertEqual(author, ("Author Name", "author@email.com"))
author = _parse_author("=?UTF-8?q?Author=20Name?= <author@email.com>")
self.assertEqual(author, ("Author Name", "author@email.com"))
def test_subject(self):
subject = _parse_subject("[PATCH v3] component: Subject.")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject (v3).")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject (try 3).")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject (take 3).")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject (rev 3).")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject [v3].")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject, v3.")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject v3.")
self.assertEqual(subject, ("component: Subject", 3))
subject = _parse_subject("[PATCH] component: Subject (resend).")
self.assertEqual(subject, ("component: Subject", 1))
# Basic tests for read_patch()
class PatchReaderTests(unittest.TestCase):
def test_simple(self):
with open("tests/simple.patch") as fp:
source = fp.read().split("\n")
# Test formatted git patch with author and subject
patchfile = tempfile.NamedTemporaryFile(mode='w+')
patchfile.write("\n".join(source))
patchfile.flush()
patches = list(read_patch(patchfile.name))
self.assertEqual(len(patches), 1)
self.assertEqual(patches[0].patch_author, "Author Name")
self.assertEqual(patches[0].patch_email, "author@email.com")
self.assertEqual(patches[0].patch_subject, "component: Replace arg1 with arg2.")
self.assertEqual(patches[0].patch_revision, 3)
self.assertEqual(patches[0].signed_off_by, [("Author Name", "author@email.com"),
("Other Developer", "other@email.com")])
self.assertEqual(patches[0].filename, patchfile.name)
self.assertEqual(patches[0].is_binary, False)
self.assertEqual(patches[0].modified_file, "test.txt")
lines = patches[0].read().rstrip("\n").split("\n")
self.assertEqual(lines, source[10:23])
# Test with git diff
del source[0:10]
self.assertTrue(source[0].startswith("diff --git"))
patchfile = tempfile.NamedTemporaryFile(mode='w+')
patchfile.write("\n".join(source))
patchfile.flush()
patches = list(read_patch(patchfile.name))
self.assertEqual(len(patches), 1)
self.assertEqual(patches[0].patch_author, None)
self.assertEqual(patches[0].patch_email, None)
self.assertEqual(patches[0].patch_subject, None)
self.assertEqual(patches[0].patch_revision, 1)
self.assertEqual(patches[0].signed_off_by, [])
self.assertEqual(patches[0].filename, patchfile.name)
self.assertEqual(patches[0].is_binary, False)
self.assertEqual(patches[0].modified_file, "test.txt")
lines = patches[0].read().rstrip("\n").split("\n")
self.assertEqual(lines, source[:13])
# Test with unified diff
del source[0:2]
self.assertTrue(source[0].startswith("---"))
patchfile = tempfile.NamedTemporaryFile(mode='w+')
patchfile.write("\n".join(source))
patchfile.flush()
patches = list(read_patch(patchfile.name))
self.assertEqual(len(patches), 1)
self.assertEqual(patches[0].patch_author, None)
self.assertEqual(patches[0].patch_email, None)
self.assertEqual(patches[0].patch_subject, None)
self.assertEqual(patches[0].patch_revision, 1)
self.assertEqual(patches[0].signed_off_by, [])
self.assertEqual(patches[0].filename, patchfile.name)
self.assertEqual(patches[0].is_binary, False)
self.assertEqual(patches[0].modified_file, "test.txt")
lines = patches[0].read().rstrip("\n").split("\n")
self.assertEqual(lines, source[:11])
# Test with StringIO buffer
fp = StringIO("\n".join(source))
patches = list(read_patch("unknown.patch", fp))
self.assertEqual(len(patches), 1)
self.assertEqual(patches[0].patch_author, None)
self.assertEqual(patches[0].patch_email, None)
self.assertEqual(patches[0].patch_subject, None)
self.assertEqual(patches[0].patch_revision, 1)
self.assertEqual(patches[0].signed_off_by, [])
self.assertEqual(patches[0].filename, "unknown.patch")
self.assertEqual(patches[0].is_binary, False)
self.assertEqual(patches[0].modified_file, "test.txt")
def test_multi(self):
with open("tests/multi.patch") as fp:
source = fp.read().split("\n")
patchfile = tempfile.NamedTemporaryFile(mode='w+')
patchfile.write("\n".join(source))
patchfile.flush()
patches = list(read_patch(patchfile.name))
self.assertEqual(len(patches), 3)
self.assertEqual(patches[0].patch_author, "Author Name")
self.assertEqual(patches[0].patch_email, "author@email.com")
self.assertEqual(patches[0].patch_subject, "component: Replace arg1 with arg2.")
self.assertEqual(patches[0].patch_revision, 3)
self.assertEqual(patches[0].signed_off_by, [("Author Name", "author@email.com"),
("Other Developer", "other@email.com")])
self.assertEqual(patches[0].filename, patchfile.name)
self.assertEqual(patches[0].is_binary, False)
self.assertEqual(patches[0].modified_file, "other_test.txt")
lines = patches[0].read().rstrip("\n").split("\n")
self.assertEqual(lines, source[11:24])
self.assertEqual(patches[1].patch_author, "Author Name")
self.assertEqual(patches[1].patch_email, "author@email.com")
self.assertEqual(patches[1].patch_subject, "component: Replace arg1 with arg2.")
self.assertEqual(patches[1].patch_revision, 3)
self.assertEqual(patches[1].signed_off_by, [("Author Name", "author@email.com"),
("Other Developer", "other@email.com")])
self.assertEqual(patches[1].filename, patchfile.name)
self.assertEqual(patches[1].is_binary, False)
self.assertEqual(patches[1].modified_file, "test.txt")
lines = patches[1].read().rstrip("\n").split("\n")
self.assertEqual(lines, source[24:46])
self.assertEqual(patches[2].patch_author, "Other Developer")
self.assertEqual(patches[2].patch_email, "other@email.com")
self.assertEqual(patches[2].patch_subject, "component: Replace arg2 with arg3.")
self.assertEqual(patches[2].patch_revision, 4)
self.assertEqual(patches[2].signed_off_by, [("Other Developer", "other@email.com")])
self.assertEqual(patches[2].filename, patchfile.name)
self.assertEqual(patches[2].is_binary, False)
self.assertEqual(patches[2].modified_file, "test.txt")
lines = patches[2].read().rstrip("\n").split("\n")
self.assertEqual(lines, source[58:71])
# Basic tests for apply_patch()
class PatchApplyTests(unittest.TestCase):
def test_apply(self):
source = ["line1();", "line2();", "line3();",
"function(arg1);",
"line5();", "line6();", "line7();"]
original = tempfile.NamedTemporaryFile(mode='w+')
original.write("\n".join(source + [""]))
original.flush()
source = ["@@ -1,7 +1,7 @@",
" line1();", " line2();", " line3();",
"-function(arg1);",
"+function(arg2);",
" line5();", " line6();", " line7();"]
patchfile = tempfile.NamedTemporaryFile(mode='w+')
patchfile.write("\n".join(source + [""]))
patchfile.flush()
expected = ["line1();", "line2();", "line3();",
"function(arg2);",
"line5();", "line6();", "line7();"]
result = apply_patch(original, patchfile, fuzz=0)
lines = result.read().rstrip("\n").split("\n")
self.assertEqual(lines, expected)
expected = ["line1();", "line2();", "line3();",
"function(arg1);",
"line5();", "line6();", "line7();"]
result = apply_patch(result, patchfile, reverse=True, fuzz=0)
lines = result.read().rstrip("\n").split("\n")
self.assertEqual(lines, expected)
# Basic tests for _preprocess_source()
class PreprocessorTests(unittest.TestCase):
def test_preprocessor(self):
source = ["int a; // comment 1",
"int b; // comment 2 \\",
" comment 3 \\",
" comment 4",
"int c; // comment with \"quotes\"",
"int d; // comment with /* c++ comment */",
"int e; /* multi \\",
" line",
" comment */",
"char *x = \"\\\\\";",
"char *y = \"abc\\\"def\";",
"char *z = \"multi\" \\",
" \"line\"",
" \"string\";"]
lines, split = _preprocess_source(source)
self.assertEqual(lines, source)
self.assertEqual(split, set([0, 1, 4, 5, 6, 9, 10, 11, 13, 14]))
# Basic tests for generate_ifdef_patch()
class GenerateIfdefPatchTests(unittest.TestCase):
def test_ifdefined(self):
source = ["line1();", "line2();", "line3();",
"function(arg1, \\",
" arg2, \\",
" arg3);",
"line5();", "line6();", "line7();"]
source1 = tempfile.NamedTemporaryFile(mode='w+')
source1.write("\n".join(source + [""]))
source1.flush()
source = ["line1();", "line2();", "line3();",
"function(arg1, \\",
" new_arg2, \\",
" arg3);",
"line5();", "line6();", "line7();"]
source2 = tempfile.NamedTemporaryFile(mode='w+')
source2.write("\n".join(source + [""]))
source2.flush()
diff = generate_ifdef_patch(source1, source1, "PATCHED")
self.assertEqual(diff, None)
diff = generate_ifdef_patch(source2, source2, "PATCHED")
self.assertEqual(diff, None)
expected = ["@@ -1,9 +1,15 @@",
" line1();", " line2();", " line3();",
"+#if !defined(PATCHED)",
" function(arg1, \\",
" arg2, \\",
" arg3);",
"+#else /* PATCHED */",
"+function(arg1, \\",
"+ new_arg2, \\",
"+ arg3);",
"+#endif /* PATCHED */",
" line5();", " line6();", " line7();"]
diff = generate_ifdef_patch(source1, source2, "PATCHED")
lines = diff.read().rstrip("\n").split("\n")
self.assertEqual(lines, expected)
expected = ["@@ -1,9 +1,15 @@",
" line1();", " line2();", " line3();",
"+#if !defined(PATCHED)",
" function(arg1, \\",
" new_arg2, \\",
" arg3);",
"+#else /* PATCHED */",
"+function(arg1, \\",
"+ arg2, \\",
"+ arg3);",
"+#endif /* PATCHED */",
" line5();", " line6();", " line7();"]
diff = generate_ifdef_patch(source2, source1, "PATCHED")
lines = diff.read().rstrip("\n").split("\n")
self.assertEqual(lines, expected)
# Basic tests for escape_sh()
class EscapeShellTests(unittest.TestCase):
ascii = "".join([chr(i) for i in range(32, 127)] + \
["\\" + chr(i) for i in range(32, 127)])
def test_bash(self):
script = tempfile.NamedTemporaryFile(mode='w+', delete=False)
try:
script.write("#!/bin/bash\nprintf '%%s\\n' '%s'\n" % escape_sh(self.ascii))
script.close()
st = os.stat(script.name)
os.chmod(script.name, st.st_mode | stat.S_IEXEC)
result = subprocess.check_output([script.name])
if not isinstance(result, str): result = result.decode('utf-8')
self.assertEqual(result.rstrip("\n"), self.ascii)
finally:
os.unlink(script.name)
@unittest.skipUnless(os.path.exists("/bin/dash"), "requires Dash")
def test_dash(self):
script = tempfile.NamedTemporaryFile(mode='w+', delete=False)
try:
script.write("#!/bin/dash\nprintf '%%s\\n' '%s'\n" % escape_sh(self.ascii))
script.close()
st = os.stat(script.name)
os.chmod(script.name, st.st_mode | stat.S_IEXEC)
result = subprocess.check_output([script.name])
if not isinstance(result, str): result = result.decode('utf-8')
self.assertEqual(result.rstrip("\n"), self.ascii)
finally:
os.unlink(script.name)
# Basic tests for escape_c()
class EscapeCTests(unittest.TestCase):
ascii = "".join([chr(i) for i in range(32, 127)] + \
["\\" + chr(i) for i in range(32, 127)])
def test_c(self):
source = tempfile.NamedTemporaryFile(mode='w+', suffix='.c', delete=False)
try:
source.write("#include <stdio.h>\n")
source.write("int main() { printf(\"%%s\", \"%s\"); return 0; }\n" % escape_c(self.ascii))
source.close()
compiled = tempfile.NamedTemporaryFile(mode='w+', delete=False)
try:
compiled.close()
subprocess.call(["gcc", source.name, "-o", compiled.name])
result = subprocess.check_output([compiled.name])
if not isinstance(result, str): result = result.decode('utf-8')
self.assertEqual(result.rstrip("\n"), self.ascii)
finally:
os.unlink(compiled.name)
finally:
os.unlink(source.name)
unittest.main()