rsync - Feb 2006 - checksum

Hello List,

i would like to know when the checksum (-c option) gets executed excatly
and where.

I aleady had a look in the docs and in the source code, but wasn?t too
lucky.

The way i want/need it would be:
   1.  make checksum on (full) source file
   2.  transfer file
   3.  check checksum on (full) destination

With "(full)" i mean the whole file, not parts/segments of it.

Is this the case?

Thanks, Mario

On Wed, Feb 15, 2006 at 04:55:40PM +0100, Mario Ohnewald
wrote:
> i would like to know when the checksum (-c option) gets executed excatly
> and where. [...]
> The way i want/need it would be:
>    1.  make checksum on (full) source file
>    2.  transfer file
>    3.  check checksum on (full) destination
No, you're confusing --checksum, a pre-transfer check, with something
that rsync does automatically: a whole-file checksum verification after
every update.  You don't normally need to use -c as long as you use -t.

..wayne..

> On Wed, Feb 15, 2006 at 06:47:34PM +0100, mario@bortal.de wrote:
>> Does the -t option use a checksum at all?
>
> No, but rsync does -- as I just said, rsync automatically does a
> whole-file checksum of every transferred file to ensure that it was
> transferred correctly.  This always happens.
Nice indeed! :)

I dont wanna piss you off, but is this documented in detail somewhere? ;)

>
>> The --checksum options creates checksums file-blocks, but not of the
>> whole file, right?
>
> No.  The --checksum option is an extra, pre-transfer, whole-file test
> for changedness that is used instead of -t to decide what files to send
> (and thus slows rsync down considerably).
ok.

Cheers, Mario