Re: [Fab-user] Non-daemonized processes

[Christian Vest Hansen]

On Tue, Jun 29, 2010 at 06:52, Jeff Forcier <address@hidden> wrote:
> Hi Kenji,
>
> The problem is not the daemonizing but the fact that your stdin is not
> in fact hooked up to the remote end -- your Ctrl-C is not terminating
> the remote end, but the local Fabric session. So foreground programs
> like tail -f will also not exit cleanly, in addition to
> daemonized-but-not-detached processes which hold up the spawning shell
> from exiting.
>
> Interaction like what you seem to have been expecting will be
> available in Fabric 1.0 (though offhand I'm not sure whether we can
> easily trap Ctrl-C itself, since it has special meaning for the local
> end too -- but that's something that can be worked out). In the
> meantime you'll have to write your Fab tasks in such a way that they
> have some sort of halt condition not requiring interaction.

I haven't looked at the code for a while, but older versions at least
trapped Ctrl-C aka. SIGINT with the signal module, to do connection
clean-up.

>
> One "cheat" is to run something like e.g.
>
>    local('ssh %s "tail -f /path/to/file"' % env.host_string, capture=False)
>
> which would use an "out-of-band" SSH connection in a local shell,
> whose pipes *are* connected to your local ones. While the Ctrl-C
> capturing Fabric does might still goof that up, it's worth a shot, and
> will definitely work for other situations where Ctrl-C isn't the halt
> method.
>
> Best,
> Jeff
>
> On Mon, Jun 28, 2010 at 12:59 AM, Kenji Wellman <address@hidden> wrote:
>> Hello,
>> To demonstrate a problem I'm having I pasted some code below. On my server
>> (Ubuntu 9.10 64 bit) when I run this code, and exit with CTRL C the "tail
>> -f" process keeps running, and I have to manually send a SIGTERM signal to
>> end it.
>>
>> Since the process is a non-daemonized process I would expect it to close
>> like in regular ssh session after it is closed. Is there any way to get
>> functionality like that? Running processes in the foreground is useful to me
>> when I'm staging a development version of my site.
>>
>> from fabric.api import run, env
>>
>> env.hosts = ['localhost']
>>
>> def test():
>>     run('tail -f /var/log/syslog')
>>
>>
>> _______________________________________________
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>>
>>
>
>
>
> --
> Jeff Forcier
> Unix sysadmin; Python/Ruby developer
> http://bitprophet.org
>
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>



-- 
Venlig hilsen / Kind regards,
Christian Vest Hansen.