comparison mercurial/patch.py @ 16123:b0c7525f826d stable

patch: fix fuzzing of hunks without previous lines (issue3264)

When applying hunks such as:

  @@ -2,1 +2,2 @@
   context
  +change

fuzzing would empty the "old" block and make patchfile.apply() traceback.
Instead, we apply the new block at specified location without testing.

The "bottom hunk" test was removed as patch(1) has no problem applying hunk
with no context in the middle of a file.

16122:9ef3a4a2c6c0

        # ok, we couldn't match the hunk. Lets look for offsets and fuzz it
        self.hash = {}
        for x, s in enumerate(self.lines):
            self.hash.setdefault(s, []).append(x)
        if h.hunk[-1][0] != ' ':
            # if the hunk tried to put something at the bottom of the file
            # override the start line and use eof here
            search_start = len(self.lines)
        else:
            search_start = orig_start + self.skew

        for fuzzlen in xrange(3):
            for toponly in [True, False]:
                old, oldstart, new, newstart = h.fuzzit(fuzzlen, toponly)

                cand = self.findlines(old[0][1:], search_start)
                for l in cand:
                    if diffhelpers.testhunk(old, self.lines, l) == 0:
                        self.lines[l : l + len(old)] = new
                        self.offset += len(new) - len(old)
                        self.skew = l - orig_start
                        self.dirty = True
                        offset = l - orig_start - fuzzlen

16123:b0c7525f826d

        # ok, we couldn't match the hunk. Lets look for offsets and fuzz it
        self.hash = {}
        for x, s in enumerate(self.lines):
            self.hash.setdefault(s, []).append(x)

        for fuzzlen in xrange(3):
            for toponly in [True, False]:
                old, oldstart, new, newstart = h.fuzzit(fuzzlen, toponly)
                oldstart = oldstart + self.offset + self.skew
                oldstart = min(oldstart, len(self.lines))
                if old:
                    cand = self.findlines(old[0][1:], oldstart)
                else:
                    # Only adding lines with no or fuzzed context, just
                    # take the skew in account
                    cand = [oldstart]

                for l in cand:
                    if not old or diffhelpers.testhunk(old, self.lines, l) == 0:
                        self.lines[l : l + len(old)] = new
                        self.offset += len(new) - len(old)
                        self.skew = l - orig_start
                        self.dirty = True
                        offset = l - orig_start - fuzzlen