Re: Executing commands at home and elsewhere

["Darren Albers" <dalbers gmail com>]

On 6/25/07, Kjetil Kjernsmo <kjetil kjernsmo net> wrote:
> Hi and thanks for the quick reply!
>
> I was meaning to start working on it, but the Real World came in and
> interferred, anyway, here we go. :-)
>
> On Tuesday 19 June 2007, Darren Albers wrote:
> > On 6/19/07, Dan Williams <dcbw redhat com> wrote:
>
> > > There's a tool called NetworkManagerDispatcher that calls scripts
> > > in /etc/NetworkManager/dispatcher.d when connections go up and down
> > > that most people use for this sort of thing, actually.
>
> > Here is one list (Though it is somewhat short since I haven't seen
> > any posted lately):
> > http://www.darrenalbers.net/wiki/index.php?title=NetworkManagerScript
> >s
> >
> > I think what you want is to use something whereami in conjunction
> > with NetworkManagerDispatcher.
>
> Great stuff, this is what I'm looking for, for sure.
>
> whereami seems to have everything I have looked for in terms of
> determining where I am. So, what remains is just executing scripts
> depending on the location.
>
> NetworkManagerDispatcher will only execute the scripts in the first
> level /etc/NetworkManager/dispatcher.d directory, right, not descend
> into subdirs?
>
> So, I was thinking about a setup similar to the Apache 2 setup on my
> box, i.e. create /etc/NetworkManager/dispatcher.d/scripts-available
> and /etc/NetworkManager/dispatcher.d/scripts-enabled and in the latter
> again subdirs for each of the locations, given the same names as in the
> whereami config, which would symlink to the actual scripts to be
> launched at each location
> in /etc/NetworkManager/dispatcher.d/scripts-available
>
> This would allow for relatively straightforward setups in the supposedly
> common case that there are several actions that would be in common for
> different locations, but not all.
>
> Does that sound like a reasonable approach?
>
> Kjetil
> --
> Kjetil Kjernsmo
> Programmer / Astrophysicist / Ski-orienteer / Orienteer / Mountaineer
> kjetil kjernsmo net
> Homepage: http://www.kjetil.kjernsmo.net/     OpenPGP KeyID: 6A6A0BBC
> _______________________________________________


I vaguely remember that Dispatcher.d doesn't support symlinks, but it
does support calling other scripts from the script itself so something
like:
if [ $2 == "up" ]; then
   /etc/init.d/whereami restart
fi


All you are doing is telling whereami to run when the interface comes
up and letting it handle the rest.  It has been a LONG time since I
have used whereami so any specifics of it are long forgotten but I
remember using it to handle my NFS mounts based on the location I was
visiting.  I am trying to remember how it knew that the network had
changed but whereami may have handled that for me automatically....
If I get some time when I get home I will take a look at whereami's
man pages.