Am Dienstag, 31. Mai 2011, 17:52:58 schrieb Philip Prindeville:
> On 5/30/11 4:00 PM, Peter Wagner wrote:
> > Hi,
> >
> > while i was reading some init files i stumbled upon this:
> >
> > /sbin/wifi detect >> /etc/config/wireless
> >
> > grep -qs config /etc/config/wireless && {
> >
> > /sbin/wifi up
> >
> > } || {
> >
> > rm -f /etc/config/wireless
> >
> > }
> >
> > this means:
> >> /sbin/wifi detect >> /etc/config/wireless
> >
> > /sbin/wifi only outputs something if /etc/config/wireless doesnt exist
> > but even if the files exist /etc/config/wireless modification time gets
> > updated. this means even when the wifi is allready configured the modtime
> > of the file gets updated everytime the system boots.
> >
> > i created this patch - maybe there is a better way to fix this.
>
> I would test for the file changing with respect to the existing copy,
> rather than non-zero length.
>
> If you change out hardware, or if you had a wireless interface but now have
> removed it, you don't want to retain invalid information.
>
> I'd use "cmp -s" to compare the two files.
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this wont work - because if the file wireless exists the script output nothing
... so if you attach a new wifi card - you would have to remove the file and
restart the router or do a wifi detect > /etc/config/wireless ...
and if the file is empty (the one wifi detect created) cmp will also return
something != 0...
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