Tramp / process has died

Tramp / process has died

[David Reitter]

How can I make tramp reconnect automatically to its ssh connection  
when it detects that the process "has died"?

As a laptop users, my network connection will occasionally break down,  
so it's perfectly normal for an SSH connection to be terminated. I  
would want tramp to react appropriately and rebuild the connection  
when necessary.

Can this be done?

Thanks
- D

Re: Tramp / process has died

[Michael Albinus]

David Reitter <david.reitter@gmail.com> writes:

> How can I make tramp reconnect automatically to its ssh connection
> when it detects that the process "has died"?

Which Tramp version do you use? The upcoming Tramp 2.1.12 has a new
command `tramp-cleanup-connection', which you can call interactively.
This is not "reconnect automatically", but it could be a starting point.

I could also try to let it run in the background when it detects a
broken connection. But this needs more sophisticated checks, in order
not to run into an infinite loop.

A sledge-hammer workaround, also applicable in Tramp 2.0, is to delete
the Tramp connection buffer *tramp/ssh ...*

> Thanks
> - D

Best regards, Michael.

Re: Tramp / process has died

[David Reitter]

On 25 Nov 2007, at 10:44, Michael Albinus wrote:

> David Reitter <david.reitter@gmail.com> writes:
>
>> How can I make tramp reconnect automatically to its ssh connection
>> when it detects that the process "has died"?
>
> Which Tramp version do you use? The upcoming Tramp 2.1.12 has a new
> command `tramp-cleanup-connection', which you can call interactively.
> This is not "reconnect automatically", but it could be a starting  
> point.

I'm running "2.0.57-pre", which is, I believe, what comes with Emacs  
22.x (CVS).

In principle what I'm doing is to quit the stack trace that I'm  
getting, and then to retry the command again. But as a user, I don't  
want that interruption - I just want it to reconnect automatically.

> I could also try to let it run in the background when it detects a
> broken connection. But this needs more sophisticated checks, in order
> not to run into an infinite loop.

Sure, reconnection attempts should be timed and spaced. Perhaps you  
can initiate them whenever a new IP address has been assigned to the  
host. And "background" is good, because this would minimize the  
"hanging" when saving (and all other accesses) (i.e. busy time in  
which Emacs is unresponsive to user input apart from C-g).

- D

Re: Tramp / process has died

[Michael Albinus]

David Reitter <david.reitter@gmail.com> writes:

>> Which Tramp version do you use? The upcoming Tramp 2.1.12 has a new
>> command `tramp-cleanup-connection', which you can call interactively.
>> This is not "reconnect automatically", but it could be a starting
>> point.
>
> I'm running "2.0.57-pre", which is, I believe, what comes with Emacs
> 22.x (CVS).

Yep, that is the Tramp version in the EMACS_22_BASE branch. But Tramp
2.0 will see bug fixes only, no new features.

>> I could also try to let it run in the background when it detects a
>> broken connection. But this needs more sophisticated checks, in order
>> not to run into an infinite loop.
>
> Sure, reconnection attempts should be timed and spaced. Perhaps you
> can initiate them whenever a new IP address has been assigned to the
> host.

Tramp does not know the underlying IP address. It will need another
approach for check. I will play a little bit with ...

> - D

Best regards, Michael.