Re: prevent writing to unmounted directory

[Chris <list.hurschler@gmx.de>]

On Friday 25 April 2008, Andrew Sackville-West wrote:
> On Thu, Apr 24, 2008 at 10:18:48PM +0200, Chris wrote:
> > On Thursday 24 April 2008, Bob McGowan wrote:
> > > Chris wrote:
> > > > Hello,
> > > >
> > > > I want to run a script to rsync local files to a NAS mounted to
> > > > /mnt/music. Sometimes the NAS is not running, and I want to prevent
> > > > the script from writing to the mount directory:  is there any easy
> > > > way to prevent this?
> > > >
> > > > Thanks,
> > > >
> > > > C
> > >
> > > if [ -f /mnt/music/somefile ]
> > > then
> > >    # run your script here.
> > > fi
> >
> > hey, cool.  I wouldn't have expected anything like this!
>
> another alternative, since it's likely that the contents of /mnt/music
> could change (I know mine does), why not do this.
>
> umount /mnt/music
> touch /mnt/music/SENTINEL
>
> then do
>
> if [ -f /mnt/music/SENTINEL ]
> then
> 	echo "Music share is not mounted!"
> 	exit 1;
> fi
>
> #run your script here
>
> the only way SENTINEL will appear is when the NAS is *not*
> mounted. And this protects whatever you are using as your SENTINEL
> from inadvertent deletion.
>
> A

that seems like a nice approach.  Why do I need to touch the SENTINEL file?

C

-- 
C. Hurschler