Re: 2.1.17 having issue with ExecResult() using pipelines

[Mark Burgess]

For your delectition I have arranged for a patch

 ExecShellResult

which will work just like ExecResult but use a shell, so that your pipes
will work now. You can get it from the svn server right now. Snapshot in
a few mins

M



On Fri, 2005-11-11 at 15:24 -0500, nathan r. hruby wrote:
> On Fri, 11 Nov 2005, Chip Seraphine wrote:
> 
> > nathan r. hruby wrote:
> >
> >> On Fri, 11 Nov 2005, Martin, Jason H wrote:
> >> 
> >>> If yada isn't in the normal path then that might be a problem; I don't
> >>> know what PATH will be set to when that happens. Good point.
> >>> 
> >> 
> >> Err.. right: here's the full real command:
> >>     CurrentLoad = ( ExecResult(/bin/sh -c "/bin/cat /proc/loadavg | 
> >> /bin/awk '{print $1}' | tr -d '\n'") )
> >> 
> >> What I'm seeing in 2.1.17 is that everything after "/bin/cat" simply
> >> dissapears and thus no pipeline.  eg, run a ps -ef while this is runnning
> >> and the awk and tr are not being executed.  The above works in 2.1.14.
> >
> >
> > I've had similar problems (starting in 2.1.16, I think).  I've been able to 
> > workaround it by switching the order of quote nesting; in other words:
> >
> 
> Yeah, I see that now
> http://groups.google.com/group/gnu.cfengine.help/browse_frm/thread/75f340262cc417d7/30b98b9f4d33df5b?q=Quotes+make+a+difference+in+2.1.16&rnum=1#30b98b9f4d33df5b
> 
> > thisworks= ( ExecResult(/bin/sh -c 'command1 "quotedarg" | command2') )
> >
> > but
> >
> > thisnoworks= ( ExecResult(/bin/sh -c "command1 'quotedarg' | command2") )
> >
> > In cases where I really neeed single quotes on the inside (as you do in 
> > your 
> > awk call), I've generally just punted and written little shell scripts for 
> > cfengine to call.  I could probably kludge it with special variables, but 
> > it 
> > gets nearly unreadable quickly.
> >
> 
> Sigh.  Neither are good solutions.  I have a lot of these little pipelines,
> all culled from the little shell scripts I'm trying to get rid of so it
> looks like the kludgy special variable it is.. Which doesn't seem to work
> either.
> 
> Oh hell.
> 
> -n