comparison mercurial/patch.py @ 6295:bace1990ab12

patch: fix corner case with update + copy patch handling (issue 937)

The self patching of files when diffed with a backup is a bit peculiar to me.
It makes sense in mpatch, that's less clear in mercurial patching code. Let's
document and preserve it for now.

6294:9cd6292abfdf

            i += 1
            # consume '//' in the path
            while i < pathlen - 1 and path[i] == '/':
                i += 1
            count -= 1
        return path[i:].rstrip()

    nulla = afile_orig == "/dev/null"
    nullb = bfile_orig == "/dev/null"
    afile = pathstrip(afile_orig, strip)
    gooda = not nulla and os.path.exists(afile)
    bfile = pathstrip(bfile_orig, strip)
    if afile == bfile:
        goodb = gooda
    else:
        goodb = not nullb and os.path.exists(bfile)
    createfunc = hunk.createfile
    if reverse:
        createfunc = hunk.rmfile
    missing = not goodb and not gooda and not createfunc()
    fname = None
    if not missing:
        if gooda and goodb:
            fname = (afile in bfile) and afile or bfile
        elif gooda:
            fname = afile

    if not fname:
        if not nullb:
            fname = (afile in bfile) and afile or bfile
        elif not nulla:
            fname = afile
        else:
            raise PatchError(_("undefined source and destination files"))

6295:bace1990ab12

            i += 1
            # consume '//' in the path
            while i < pathlen - 1 and path[i] == '/':
                i += 1
            count -= 1
        return path[:i].lstrip(), path[i:].rstrip()

    nulla = afile_orig == "/dev/null"
    nullb = bfile_orig == "/dev/null"
    abase, afile = pathstrip(afile_orig, strip)
    gooda = not nulla and os.path.exists(afile)
    bbase, bfile = pathstrip(bfile_orig, strip)
    if afile == bfile:
        goodb = gooda
    else:
        goodb = not nullb and os.path.exists(bfile)
    createfunc = hunk.createfile
    if reverse:
        createfunc = hunk.rmfile
    missing = not goodb and not gooda and not createfunc()
    # If afile is "a/b/foo" and bfile is "a/b/foo.orig" we assume the
    # diff is between a file and its backup. In this case, the original
    # file should be patched (see original mpatch code).
    isbackup = (abase == bbase and bfile.startswith(afile))
    fname = None
    if not missing:
        if gooda and goodb:
            fname = isbackup and afile or bfile
        elif gooda:
            fname = afile

    if not fname:
        if not nullb:
            fname = isbackup and afile or bfile
        elif not nulla:
            fname = afile
        else:
            raise PatchError(_("undefined source and destination files"))