Partial transferred files useless at resume, compare-dir can help ?

[Constantin Teodorescu]

Matt McCutchen wrote:
> On Tue, 2006-06-13 at 22:00 +0300, Constantin Teodorescu wrote:
>   
>> I heard about the --partial option in order to keep the partial 
>> transferred file. I thought that rsync will apply his incremental check 
>> and update alghoritm on that partial file and resume the transfer.
>>
>> Unfortunatelly , the temporary file name is a unique file name ( 
>> .mydb-dump.sql.bz2.MkVSHy ) and in the next transfer session it will be 
>> another one  , so "partial" transfer files does not help me much.
>>     
>
> If you use --partial and the transfer is interrupted, the receiving
> rsync moves the partial file over the original when it dies, so the file
> will be found on the next attempt.  However, you say you want an atomic
> switch, so this won't do.
>   
I tried to simulate this by cutting the connection (remove the phone 
cable from the modem).
If --partial is not specified , the temporary file (  
.mydb-dump.sql.bz2.MkVSHy ) is erased and lost for ever.

If --partial is specified , the temporary file ( 
.mydb-dump.sql.bz2.MkVSHy ) is kept, and NOT MOVED OVER THE ORIGINAL 
(TARGET FILE).
>   
>> Can "--compare-dir" help me?
>>     
>
> No, but --partial-dir does exactly what you want.  Use something like
> --partial-dir=.rsync-partial.  When the receiving rsync dies, it will
> create a directory .rsync-partial and move the partial file
> from .mydb-dump.sql.bz2.MkVSHy to .rsync-partial/mydb-dumb.sql.bz2.
>   
Tried that right from the first time , because it's written in the man 
pages.
There is no .rsync-partial created there, the same ( 
.mydb-dump.sql.bz2.MkVSHy ) appears in the target directory , the same 
thing is happening ! :-(
> On the next attempt, the receiving rsync will copy the data in the
> partial file to a new temporary file and continue receiving data where
> it left off.  If the transfer gets interrupted again, rsync will move
> the new temporary file over the old partial file so it will be there for
> the next attempt, etc.
>
> Only when the complete file has been assembled on the receiver will
> rsync move it over the original; then rsync will clean up after itself
> by deleting .rsync-partial .
>   
This is EXACTLY what I wanted , and tried for the first time , like in 
the manual  but no ... it's behaviour is not changed at all ! :-(

Teo