rsync - Apr 2007 - why does --size-only not detect change only is size (but also time)?

Hi,
	I'm wondering why when I use --size-only on the same file, except the 
modification time, rsync transfers the modification time?
	I was under the impression that --size-only caused rsync to transfer files 
based upon differences in the size of the file.

For example:

#cp Untitled.pdf Untitled-2.pdf

#touch Untitled.pdf

#rsync -ani --size-only Untitled.pdf Untitled-2.pdf
.f..t...... Untitled.pdf

#ls -al --block-size=1 Untitled*
-rw------- 1 csights csights 20696 2007-04-18 19:00 Untitled-2.pdf
-rw------- 1 csights csights 20696 2007-04-18 19:08 Untitled.pdf


	It seems to me as though this file should not be transfered because the sizes 
are the same.

Thanks,
	C.

On Wed, Apr 18, 2007 at 07:37:44PM -0400, CSights wrote:
> #rsync -ani --size-only Untitled.pdf Untitled-2.pdf
> .f..t...... Untitled.pdf
The file was not transferred (since there was not '<' or
'>' in the
first character).  The time was changed due to the --times option being
implied by -a.

..wayne..

On 4/18/07, CSights <csights@fastmail.fm> wrote:
>         I'm wondering why when I use --size-only on the same file,
except the
> modification time, rsync transfers the modification time?
>         I was under the impression that --size-only caused rsync to
transfer files
> based upon differences in the size of the file.
[...]
> #rsync -ani --size-only Untitled.pdf Untitled-2.pdf
> .f..t...... Untitled.pdf
[...]
>         It seems to me as though this file should not be transfered because
the sizes
> are the same.
The first character of the itemize line is a period, which means that
rsync decided that the file's data was the same on both sides and thus
didn't transfer the file per se.  (If rsync did transfer it, the
character would be a < or >.)  All rsync did was copy the mtime, which
you asked it to do by passing -a, which includes --times.

If you don't want to copy mtimes at all, add --no-times somewhere
after the -a on the command line.  Then transferred files will have
their mtimes set to the current time by virtue of rsync modifying
their data, while other files' mtimes will be left alone.  I don't
think there's a way to copy mtimes on transferred files but not
already up-to-date files.

Matt