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320 lines
12 KiB
Python
320 lines
12 KiB
Python
#!/usr/bin/python
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#
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# Python functions to read, split and apply patches.
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#
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# Copyright (C) 2014 Sebastian Lackner
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#
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import collections
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import difflib
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import hashlib
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import itertools
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import os
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import re
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import subprocess
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import tempfile
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class PatchParserError(RuntimeError):
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"""Unable to parse patch file - either an unimplemented feature, or corrupted patch."""
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pass
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class PatchApplyError(RuntimeError):
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"""Failed to apply/merge patch."""
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pass
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class PatchObject(object):
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def __init__(self, filename):
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self.extracted_patch = None
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self.unique_hash = None
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self.filename = filename
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self.offset_begin = None
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self.offset_end = None
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self.isbinary = False
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self.oldname = None
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self.newname = None
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self.modified_file = None
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self.oldsha1 = None
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self.newsha1 = None
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self.newmode = None
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def is_binary(self):
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return self.isbinary
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def read_chunks(self):
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"""Iterates over arbitrary sized chunks of this patch."""
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assert self.offset_end >= self.offset_begin
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with open(self.filename) as fp:
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fp.seek(self.offset_begin)
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i = self.offset_end - self.offset_begin
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while i > 0:
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buf = fp.read(4096 if i > 4096 else i)
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if buf == "": raise IOError("Unable to extract patch.")
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yield buf
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i -= len(buf)
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def extract(self):
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"""Create a temporary file containing the extracted patch."""
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if not self.extracted_patch:
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self.extracted_patch = tempfile.NamedTemporaryFile()
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for chunk in self.read_chunks():
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self.extracted_patch.write(chunk)
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self.extracted_patch.flush()
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return self.extracted_patch
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def hash(self):
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"""Hash the content of the patch."""
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if not self.unique_hash:
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m = hashlib.sha256()
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for chunk in self.read_chunks():
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m.update(chunk)
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self.unique_hash = m.digest()
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return self.unique_hash
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def read_patch(filename):
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"""Iterates over all patches contained in a file, and returns PatchObject objects."""
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class _FileReader(object):
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def __init__(self, filename):
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self.filename = filename
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self.fp = open(self.filename)
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self.peeked = None
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def close(self):
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self.fp.close()
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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def seek(self, pos):
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"""Change the file cursor position."""
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self.fp.seek(pos)
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self.peeked = None
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def tell(self):
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"""Return the current file cursor position."""
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if self.peeked is None:
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return self.fp.tell()
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return self.peeked[0]
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def peek(self):
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"""Read one line without changing the file cursor."""
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if self.peeked is None:
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pos = self.fp.tell()
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tmp = self.fp.readline()
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if len(tmp) == 0: return None
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self.peeked = (pos, tmp)
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return self.peeked[1]
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def read(self):
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"""Read one line from the file, and move the file cursor to the next line."""
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if self.peeked is None:
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tmp = self.fp.readline()
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if len(tmp) == 0: return None
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return tmp
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tmp, self.peeked = self.peeked, None
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return tmp[1]
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def _read_single_patch(fp, oldname=None, newname=None):
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"""Internal function to read a single patch from a file."""
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patch = PatchObject(fp.filename)
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patch.offset_begin = fp.tell()
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patch.oldname = oldname
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patch.newname = newname
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# Skip over initial diff --git header
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line = fp.peek()
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if line.startswith("diff --git "):
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assert fp.read() == line
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# Read header
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while True:
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line = fp.peek()
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if line is None:
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break
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elif line.startswith("--- "):
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patch.oldname = line[4:].strip()
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elif line.startswith("+++ "):
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patch.newname = line[4:].strip()
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elif line.startswith("old mode") or line.startswith("deleted file mode"):
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pass # ignore
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elif line.startswith("new mode "):
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patch.newmode = line[9:].strip()
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elif line.startswith("new file mode "):
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patch.newmode = line[14:].strip()
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elif line.startswith("new mode") or line.startswith("new file mode"):
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raise PatchParserError("Unable to parse header line '%s'." % line)
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elif line.startswith("copy from") or line.startswith("copy to"):
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raise NotImplementedError("Patch copy header not implemented yet.")
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elif line.startswith("rename "):
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raise NotImplementedError("Patch rename header not implemented yet.")
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elif line.startswith("similarity index") or line.startswith("dissimilarity index"):
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pass # ignore
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elif line.startswith("index "):
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r = re.match("^index ([a-fA-F0-9]*)\.\.([a-fA-F0-9]*)", line)
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if not r: raise PatchParserError("Unable to parse index header line '%s'." % line)
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patch.oldsha1, patch.newsha1 = r.group(1), r.group(2)
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else:
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break
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assert fp.read() == line
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if patch.oldname is None or patch.newname is None:
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raise PatchParserError("Missing old or new name.")
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elif patch.oldname == "/dev/null" and patch.newname == "/dev/null":
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raise PatchParserError("Old and new name is /dev/null?")
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if patch.oldname.startswith("a/"):
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patch.oldname = patch.oldname[2:]
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elif patch.oldname != "/dev/null":
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raise PatchParserError("Old name in patch doesn't start with a/.")
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if patch.newname.startswith("b/"):
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patch.newname = patch.newname[2:]
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elif patch.newname != "/dev/null":
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raise PatchParserError("New name in patch doesn't start with b/.")
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if patch.newname != "/dev/null":
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patch.modified_file = patch.newname
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else:
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patch.modified_file = patch.oldname
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# Decide between binary and textual patch
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if line is None or line.startswith("diff --git ") or line.startswith("--- "):
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if oldname != newname:
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raise PatchParserError("Stripped old- and new name doesn't match.")
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elif line.startswith("@@ -"):
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while True:
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line = fp.peek()
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if line is None or not line.startswith("@@ -"):
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break
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r = re.match("^@@ -(([0-9]+),)?([0-9]+) \+(([0-9]+),)?([0-9]+) @@", line)
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if not r: raise PatchParserError("Unable to parse hunk header '%s'." % line)
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srcpos = max(int(r.group(2)) - 1, 0) if r.group(2) else 0
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dstpos = max(int(r.group(5)) - 1, 0) if r.group(5) else 0
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srclines, dstlines = int(r.group(3)), int(r.group(6))
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if srclines <= 0 and dstlines <= 0:
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raise PatchParserError("Empty hunk doesn't make sense.")
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assert fp.read() == line
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while srclines > 0 or dstlines > 0:
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line = fp.read()
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if line is None:
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raise PatchParserError("Truncated patch.")
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elif line.startswith(" "):
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if srclines == 0 or dstlines == 0:
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raise PatchParserError("Corrupted patch.")
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srclines -= 1
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dstlines -= 1
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elif line.startswith("-"):
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if srclines == 0:
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raise PatchParserError("Corrupted patch.")
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srclines -= 1
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elif line.startswith("+"):
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if dstlines == 0:
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raise PatchParserError("Corrupted patch.")
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dstlines -= 1
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elif line.startswith("\\ "):
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pass # ignore
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else:
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raise PatchParserError("Unexpected line in hunk.")
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while True:
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line = fp.peek()
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if line is None or not line.startswith("\\ "): break
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assert fp.read() == line
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elif line.rstrip() == "GIT binary patch":
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if patch.oldsha1 is None or patch.newsha1 is None:
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raise PatchParserError("Missing index header, sha1 sums required for binary patch.")
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elif patch.oldname != patch.newname:
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raise PatchParserError("Stripped old- and new name doesn't match for binary patch.")
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assert fp.read() == line
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line = fp.read()
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if line is None: raise PatchParserError("Unexpected end of file.")
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r = re.match("^(literal|delta) ([0-9]+)", line)
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if not r: raise NotImplementedError("Only literal/delta patches are supported.")
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patch.isbinary = True
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# Skip over patch data
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while True:
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line = fp.read()
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if line is None or line.strip() == "":
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break
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else:
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raise PatchParserError("Unknown patch format.")
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patch.offset_end = fp.tell()
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return patch
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with _FileReader(filename) as fp:
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while True:
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line = fp.peek()
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if line is None:
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break
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elif line.startswith("diff --git "):
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tmp = line.strip().split(" ")
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if len(tmp) != 4: raise PatchParserError("Unable to parse git diff header line '%s'." % line)
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yield _read_single_patch(fp, tmp[2].strip(), tmp[3].strip())
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elif line.startswith("--- "):
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yield _read_single_patch(fp)
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elif line.startswith("@@ -") or line.startswith("+++ "):
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raise PatchParserError("Patch didn't start with a git or diff header.")
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else:
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assert fp.read() == line
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def apply_patch(content, patches, reverse=False, fuzz=2):
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"""Apply a patch with optional fuzz - uses the commandline 'patch' utility."""
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if not isinstance(patches, collections.Sequence):
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patches = [patches]
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contentfile = tempfile.NamedTemporaryFile(delete=False)
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try:
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contentfile.write(content)
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contentfile.close()
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for patch in patches:
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patchfile = patch.extract()
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cmdline = ["patch", "--batch", "--silent", "-r", "-"]
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if reverse: cmdline.append("--reverse")
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if fuzz != 2: cmdline.append("--fuzz=%d" % fuzz)
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cmdline += [contentfile.name, patchfile.name]
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exitcode = subprocess.call(cmdline)
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if exitcode != 0:
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raise PatchApplyError("Failed to apply patch (exitcode %d)." % exitcode)
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with open(contentfile.name) as fp:
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content = fp.read()
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finally:
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os.unlink(contentfile.name)
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return content
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