12 Jul
2011
12 Jul
'11
3:29 p.m.
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@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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