On Mon, Jan 24, 2011 at 03:50:04PM +0100, Agustin Martin wrote:
> On Mon, Jan 24, 2011 at 02:17:48PM +0100, Harald Jenny wrote:
> > Hi Augustin
> > 
> > On Sun, Jan 23, 2011 at 01:38:47AM +0100, Agustin Martin wrote:
> > > 2011/1/21 Teodor MICU <mteo...@gmail.com>:
> > > > 2011/1/21 Agustin Martin <agmar...@debian.org>:
> > > >> if [ "$MILTERSOCKET" ] && [ "`echo $MILTERSOCKET | grep -v ^inet`" ]; 
> > > >> then
> > > >>
> > > >> but as Teodor points out (just read it), second check seems to be 
> > > >> enough.
> > > >
> > > > Only that I realized latter the intention of this construction. My
> > > > previous suggestion was to use this construction on its own without
> > > > "test":
> > > >
> > > > if echo "$MILTERSOCKET" | grep -q -v "^inet"; then
> > > > ...
> > > > fi
> > > > (the return code is set by grep)
> > > >
> > > > This works too but there is an extra test for the empty string:
> > > > if [ "$(echo $MILTERSOCKET | grep -v ^inet)" ]; then
> > > > ...
> > > > fi
> > > > (the return code is set by 'test')
> > > 
> > > If I understand correctly, first expression saves redundant checks, so
> > > is preferrable.
> > 
> > I will have a to check this - this is meant as a guard against accidently
> > setting $MILTERSOCKET to "".
> 
> Damm, seems I wrongly understood Theodor's mail, and my proposed change will 
> not work because of echo newline. Anyway, in the case above, 'echo -n' 
> (allowed by policy 10.4) 
> 
> http://www.de.debian.org/doc/debian-policy/ch-files.html#s-scripts
> 
> should help with that,

Thanks for the pointer

> 
> if echo -n "$MILTERSOCKET" | grep -q -v "^inet"; then 
> 
> That will still not protect against things like setting $MILTERSOCKET 
> to " ", but dealing with "" is a must.

Yes it is, will upload a new version of my patch ASAP.

> 
> -- 
> Agustin
> 

Harald



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