[ale] One home directory

[Jim Kinney]

On Wed, Oct 14, 2009 at 9:02 AM, Jeff Lightner <jlightner at water.com> wrote:
> It won't delete things unless you tell it to.  One hopes that someone
> that is using the same file on two separate systems isn't updating it
> independently on each as that is the only time it would "clobber" the
> file on one side or the other.   If one IS updating it on each side
> independently I doubt there is any tool that would reasonably decided
> which version is the one you want - at best it would decided based on
> which one had last been updated.

at which point it is discovered that the _real_ master version machine
has a bad clock and ntp was never turned on...

rsync is a perfect tool for replicating copies as long as the sync
from master, edit local, sync to master process is followed with out
fail.

If multiple people are editing remote copies then a real check-out/in
tool is required.
>
> -----Original Message-----
> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
> Brian Pitts
> Sent: Tuesday, October 13, 2009 8:13 PM
> To: ale at ale.org
> Subject: Re: [ale] One home directory
>
> On 10/13/2009 02:39 PM, Jeff Lightner wrote:
>> Unison is based on rsync I believe.  Haven't used it but have heard
> good
>> things about it.
>>
>> By unidirectional I assume you mean rsync only updates one side on a
>> given run.  I'm not really sure that is the case (I'd have to explore
>> flags) but even if it were it only means you'd need to run two
> separate
>> rsync jobs - one that used one side as the source and the other as the
>> target and another that used the original source as target and
> original
>> target as source.
>
> That won't work. The first rsync from system one to system two will
> clobber all the files you've changed on system two. From the manpage,
> 'Rsync  finds  files  that  need to be transferred using a "quick check"
> algorithm (by default) that looks for files that have changed  in size
> or in last-modified time.'
>
> $ mkdir one two
> $ touch one/a one/b
> $ rsync -av one/ two/
> sending incremental file list
> ./
> a
> b
>
> sent 138 bytes  received 53 bytes  382.00 bytes/sec
> total size is 0  speedup is 0.00
> $ ls -l one two
> one:
> total 0
> -rw-rw-r-- 1 brian brian 0 2009-10-13 20:07 a
> -rw-rw-r-- 1 brian brian 0 2009-10-13 20:07 b
>
> two:
> total 0
> -rw-rw-r-- 1 brian brian 0 2009-10-13 20:07 a
> -rw-rw-r-- 1 brian brian 0 2009-10-13 20:07 b
> $ echo one > one/a
> $ echo two > two/b
> $ ls -l one two
> one:
> total 4
> -rw-rw-r-- 1 brian brian 4 2009-10-13 20:07 a
> -rw-rw-r-- 1 brian brian 0 2009-10-13 20:07 b
>
> two:
> total 4
> -rw-rw-r-- 1 brian brian 0 2009-10-13 20:07 a
> -rw-rw-r-- 1 brian brian 4 2009-10-13 20:07 b
> $ cat two/b
> two
> $ rsync -av one/ two/
> sending incremental file list
> a
> b
>
> sent 151 bytes  received 50 bytes  402.00 bytes/sec
> total size is 4  speedup is 0.02
> $ cat two/b
> $
>
> --
> All the best,
> Brian Pitts
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-- 
-- 
James P. Kinney III
Actively in pursuit of Life, Liberty and Happiness