[CentOS-mirror] I see all your new mirrors ...

[João Carlos Mendes Luís]

I was just following the examples given in the manual, but, indeed, your 
suggestion is very good.  Thanks a lot!


                                        Jonny

-- 
João Carlos Mendes Luís - Computer&  Networking Engineer
jonny at jonny.eng.br


On 07/14/2011 08:36 PM, Kealey, Martin, VF-NZ wrote:
>
> Perhaps that example code would clearer if written:
>
> (
>     if ! flock -w 1 200 ; then
>             echo>&2 "Another process is still running..."
>             exit
>     fi
>     RunLocked
> ) 200>  ${lockdir}/mirror.centos.lock
>
> Or
>
> exec 200>  ${lockdir}/mirror.centos.lock
> if ! flock -w 1 200 ; then
>     echo>&2 "Another process is still running..."
>     exit
> fi
> RunLocked
>
> Or for a more succinct version:
>
> ( flock -w 1  200&&  RunLocked ) 200>  ${lockdir}/mirror.centos.lock
>
> (Point is: referencing "|$?|" is almost never needed, and usually 
> obfuscatory.)
>
> *From:*centos-mirror-bounces at centos.org 
> [mailto:centos-mirror-bounces at centos.org] *On Behalf Of *João Carlos 
> Mendes Luís
> *Sent:* 13 July 2011 03:29
> *To:* Mailing list for CentOS mirrors.
> *Subject:* Re: [CentOS-mirror] I see all your new mirrors ...
>
> Using "touch" and "test -e" as a lock test is not safe.  If the shell 
> dies for any reason, the lock file will get stale.
>
> If you sync station is linux, a safer option is to use the flock(1) 
> program:
>
>
> *NAME**
>        flock - Manage locks from shell scripts
>
> SYNOPSIS
>        flock [-sxon] [-w timeout] lockfile [-c] command...
>
>        flock [-sxon] [-w timeout] lockdir [-c] command...
>
>        flock [-sxun] [-w timeout] fd
> *
>
> Here is the lock part of my mirror script:
>
> *RunLocked()**
> {
>    ....
> }
>
> (
>   flock -w 1 200
>   if [ "$?" -ne 0 ] ; then
>     echo "Error, lock is already taken..."
>     exit
>   else
>     RunLocked
>   fi
> ) 200> ${lockdir}/mirror.centos.lock
>
> *
>
>                                         Jonny
>   
> -- 
> João Carlos Mendes Luís - Computer&  Networking Engineer
> jonny at jonny.eng.br  <mailto:jonny at jonny.eng.br>
>
>
> On 07/12/2011 11:56 AM, Adam wrote:
>
> admin wrote:
>
>
> Yes It would be great . I'm still rsync centos repo.
> Could you provide me bash script to rsync with file locking ?
>
>
> Attached is a bash locking rsync script.  This script is pretty 
> informative and intelligent.  It verifies that the time stamp of the 
> server you are syncing form is newer then yours before it syncs.  
> Hence it shouldn't ever delete files you have already downloaded if 
> you hit an old mirror.
>
> Adam
>
>   
>   
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