prevent writing to unmounted directory
 

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


How are you accessing the NAS? NFS? SAMBA?

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prevent writing to unmounted directory
 

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

There are other ways to do the test, depending on how the mount was
done: at boot with fstab, mounted by a user using 'mount', automounted,
or by some other method.


If mounted at boot time but the mount fails, output of 'mount' with no
args would not have /mnt/music in it, so grep could be used in that case.


If mounted by the user, then mount would fail if the NAS were down, and
that could be tested for (assuming the 'mount' is part of the script).


Or, 'df /mnt/music', which returns info for the mounted device, if
mounted, and for the root device if not.


These latter suggestions require pipes to grep for values that are valid
for the mounted condition, with checks on the grep exit status
determining whether or not you continue.


For example, with the 'df' suggestion:

if df /mnt/music | grep /mnt/music > /dev/null
then
# run your script here.
fi

Using I/O redirection, with grep, is more portable, but for Linux
systems (or, specifically, any system with Gnu grep), you can use 'grep
-q /mnt/music' instead.


--
Bob McGowan

prevent writing to unmounted directory
 

On Thursday 24 April 2008, Damon L. Chesser 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
>
> How are you accessing the NAS? NFS? SAMBA?

smbfs

>
> --
> Damon L. Chesser
> damon@damtek.com
> http://www.linkedin.com/in/dchesser



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prevent writing to unmounted directory
 

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!

>
> There are other ways to do the test, depending on how the mount was
> done: at boot with fstab, mounted by a user using 'mount', automounted,
> or by some other method.
>
> If mounted at boot time but the mount fails, output of 'mount' with no
> args would not have /mnt/music in it, so grep could be used in that case.
>
> If mounted by the user, then mount would fail if the NAS were down, and
> that could be tested for (assuming the 'mount' is part of the script).
>
> Or, 'df /mnt/music', which returns info for the mounted device, if
> mounted, and for the root device if not.
>
> These latter suggestions require pipes to grep for values that are valid
> for the mounted condition, with checks on the grep exit status
> determining whether or not you continue.
>
> For example, with the 'df' suggestion:
>
> if df /mnt/music | grep /mnt/music > /dev/null
> then
> # run your script here.
> fi

I'll give this a shot.

BTW I'm running rsyc -rltuDOvz which seems like the only way to get it to work
to my NAS (mounted as smbfs in fstab) without all sorts of group and
timestamp errors. Ths thing is that the files are landing on the NAS with
the copy date, not the date they have on the source, which I don't think i
really like.

C

>
> Using I/O redirection, with grep, is more portable, but for Linux
> systems (or, specifically, any system with Gnu grep), you can use 'grep
> -q /mnt/music' instead.



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prevent writing to unmounted directory
 

Touch a file on the NAS share with a name such as
NAS.HERE, and in your script check that that file
exists. If it exists, then it's mounted, if not, then
it's not mounted.


Ken

--- Chris <list.hurschler@gmx.de> wrote:

> On Thursday 24 April 2008, Damon L. Chesser 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
> >
> > How are you accessing the NAS? NFS? SAMBA?
>
> smbfs
>
> >
> > --
> > Damon L. Chesser
> > damon@damtek.com
> > http://www.linkedin.com/in/dchesser
>
>
>
> --
> C. Hurschler
>
>
> --
> To UNSUBSCRIBE, email to
> debian-user-REQUEST@lists.debian.org
> with a subject of "unsubscribe". Trouble? Contact
> listmaster@lists.debian.org
>
>





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prevent writing to unmounted directory
 

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

prevent writing to unmounted directory
 

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

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prevent writing to unmounted directory
 

On Thursday 24 Apr 2008, Chris wrote:
> mounted as smbfs in fstab

I thought smbfs was unmaintained and that cifs was the better option - anyone?

Chris.


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prevent writing to unmounted directory
 

Chris wrote:



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

C



Chris,

in the example, you touch the file ONCE to make it exist. Then when you
mount music, it will "mask" the file. That file will only show up when
your smb mount for music is not mounted. Try it.


When you make a file in a dir /tmp/test then mount something in
/tmp/test the contents of /tmp/test will only show the mounted files.
When you unmount /tmp/test the original file will still be there.


I think this is a rather elegant approach independent of networking. If
networking is down, you will see the "touched" file. If networking is
up and smb/CIF is working, you will not see it. The "touched" file will
not be overwritten by your file moving/deletion/backups/restores.


Does that help?

--
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damon@damtek.com
http://www.linkedin.com/in/dchesser


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prevent writing to unmounted directory
 

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's an excellent suggestion. Way cool!

--
Bob McGowan