ifup and run-parts

[David Collier]

FWIW this implements my suggestion

    buf = xasprintf( "run-parts /etc/network/if-%s.d -a %s", opt, 
                      get_var( "iface", sizeof("iface") , ifd ) );

D


In article <memo.20110125160420.5476D at postmaster+dexdyne.com.cix.co.uk>,
from_busybox_maillist at dexdyne.com (David Collier) wrote:

> *From:* "David Collier" <from_busybox_maillist at dexdyne.com>
> *To:* busybox at busybox.net
> *Date:* Tue, 25 Jan 2011 16:04 +0000 (GMT Standard Time)
> 
> I'm trying to get to grips with what the /etc/network/if-up.d ( and
> friends ) scripts are all about.
> 
> As far as I can see they are automatically invoked by ifup and 
> ifdown
> 
> Is that the only thing that calls them?
> 
> D
> 
> ====================================================
> 
> One thing that puzzles me - I see this
> 
>     run-parts /etc/network/if-down.d
>     ifconfig lo 127.0.0.1 down
>     run-parts /etc/network/if-post-down.d
>                                                                     
>         run-parts /etc/network/if-down.d
>     ifconfig eth0 down
>     run-parts /etc/network/if-post-down.d
>  
> but how are the scripts in if-down.d to know if they are to run or 
> not,
> assuming they actually only apply to a single interface?
> 
> should it not do
> 
>     run-parts /etc/network/if-down.d       -a lo
>     ifconfig lo 127.0.0.1 down
>     run-parts /etc/network/if-post-down.d  -a lo
>                                                                     
>         run-parts /etc/network/if-down.d       -a eth0
>     ifconfig eth0 down
>     run-parts /etc/network/if-post-down.d  -a eth0
> 
> or is there some other environment variable that allows the scripts 
> to
> work out if it's their own personal interface that's being operated 
> on?
> 
> I assume I can make, and maybe submit, a patch to this line
> 
> 	buf = xasprintf("run-parts /etc/network/if-%s.d", opt);
> 
> in ifupdown.c to add the "-a <interface>" which I think is such a 
> good
> idea!
>         
> ----------------------------------------------------
> by the way - in Config.in the help test for run-parts says you can
> exclude it - but if it's issued by ifup and ifdown, then won't that
> provoke errors?
> 
> config RUN_PARTS
> 	bool "run-parts"
> 	default y
> 	help
> 	  run-parts is a utility designed to run all the scripts in a
>       directory.
> 
> 	  It is useful to set up a directory like cron.daily, where you
>       need to execute all the scripts in that directory.
> 
> 	  In this implementation of run-parts some features (such as report
> 	  mode) are not implemented.
> 
> 	  Unless you know that run-parts is used in some of your scripts
> 	  you can safely say N here.
> 
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