[PATCH] One more -x to not traverse cyclic bind-mounts

[Jeff Hansen]

On 01/13/2011 06:14 PM, Wayne Davison wrote:
> On Thu, Jan 13, 2011 at 10:24 AM, Jeff Hansen 
> <jhansen at cardaccess-inc.com <mailto:jhansen at cardaccess-inc.com>> wrote:
>
>     This patch allows one to repeat the '-x' option a third time to
>     stop rsync from traversing potentially cyclic bind mounts that are
>     on the same filesystem.
>
>
> See the support/mnt-excl script for one way exclude all mounts 
> (including bind mounts) from an rsync.  The script also recommends an 
> awk command piped into an absolute-anchored exclude, but does get some 
> of the details wrong.  Here's a better explanation:
>
> awk '{print $2}' /proc/mounts | rsync -avf 'merge,/- -' /dir host:/dest/
>
> The above will get a list of all mount points on the system and use it 
> as an exclude list to prevent any mounts from being traversed. 
>  However, what it will not do is to protect the related mount points 
> on the receiving side from deletion unless you happen to be copying 
> into an exactly-the-same path on the destination.  If you want the 
> excluded directories to be protected on the receiving side, you're 
> better off using the mnt-excl script (which tweaks the excludes to be 
> relative to the transfer).
>
> ..wayne..
I'm really just trying to make things easier on everybody; i.e. avoid 
having to use scripts to do simple things.  It seems like adding some 
sort of a flag to get this functionality would benefit everyone more 
than pointing them to an awk script that may or may not be readily 
available/usable.

Either that, or we should fix the '-x' flag so that it actually does 
what it purports to do -- stay on *one* file system.  Conceptually, I 
would not consider a bind mount the "same" file system, especially wrt 
backups.

-Jeff

-- 
**** ////Jeff Hansen
////Card Access, Inc.//
//11778 So. Election Rd., Ste. 260//
//Salt Lake City, UT 84020//
//JHansen at CardAccess-inc.com// <mailto:JHansen at CardAccess-inc.com>
//www.CardAccess-inc.com <http://www.cardaccess-inc.com/>//
//801-748-4900 ext 26 (Office)//
//801-748-4901 (fax)//

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