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From Matt Benson <gudnabr...@yahoo.com>
Subject Re: How to hide output of an <exec> -- DON'T use spawn=true
Date Fri, 15 Apr 2005 20:13:07 GMT
--- Ninju Bohra <ninju_bohra@yahoo.com> wrote:

> Oops,
> 
> Look like the "spawn" attribute route won't work :-)
> 
> With "spawn=true" the <exec> task does NOT "block"
> and
> wait for the executable to finish.  I need to have
> the
> script proceed only after the execuatable is
> finished,
> so we down to the <redirector> and/or moving to
> 1.6.3

Ninju:  I wrote the redirector stuff a year ago and to
my chagrin only just discovered that refid'd
redirectors do not work!  A huge bug that will be
fixed in CVS within the hour, and will be in Ant 1.6.3
.  I will post an example after the bug is fixed.

Thanks,
Matt

> 
> 
> --- Ninju Bohra <ninju_bohra@yahoo.com> wrote:
> 
> > I thought about using the output attribute, but
> what
> > value would I use for when they DO want the output
> > to
> > come to the console?  I don't want to have the
> > <exec>
> > task duplicated (differing only in one have the
> > output="NUL" and the other not using the output
> > attribute) and then a set of conditions
> controlling
> > which <exec> to invoke.
> > 
> > Actually, I am thinking of using the spawn
> attribute
> > instead.  The default value of the ${hide_output}
> > property would be 'false', the CC script would set
> > the
> > ${hide_output} to 'true' when it invoke the script
> > and
> > the single task call would be:
> > 
> >    <exec executable="..." spawn=${hide_output}>
> >         <arg line...>
> >             .
> >             .
> >             .
> >    </exec>
> > 
> > What do you think?
> > --- Matt Benson <gudnabrsam@yahoo.com> wrote:
> > > If you are using a recent version of Ant, you
> > could
> > > redirect to your null device (a file).  Since
> > you're
> > > on Windows (I assume from the backslashed
> paths),
> > > the
> > > file will be NUL .  You could do some
> conditional
> > > stuff based on OS to choose NUL or /dev/null as
> > your
> > > null device and be cross-platform, but basically
> > > <exec
> > > output="NUL"> should work on Windows.
> > > 
> > > HTH,
> > > Matt
> > > 
> > > --- Ninju Bohra <ninju_bohra@yahoo.com> wrote:
> > > > Hello all,
> > > > 
> > > > On my Windows Box, I have a series of <exec>
> > calls
> > > > to
> > > > do a set of Orcale database operations, one of
> > the
> > > > calls look like:
> > > > 
> > > >        <exec executable="imp.exe">
> > > >           <arg value="${import.login}"/>
> > > >           <arg
> > > > value="file=${export.dir}\DataExport.dmp"/>
> > > >           <arg
> > > > value="log=${export.dir}\DataImport.log"/>
> > > >           <arg
> > > > value="parfile=${export.dir}\fromuser.txt"/>
> > > >           <arg value="touser=${import.user}"/>
> > > >           <arg value="BUFFER=32000000"/>
> > > >           <arg value="RECORDLENGTH=65535"/>
> > > >           <arg value="IGNORE=N"/>
> > > >           <arg value="GRANTS=N"/>
> > > >           <arg value="ROWS=Y"/>
> > > >           <arg value="COMMIT=N"/>
> > > >           <arg value="INDEXES=Y"/>
> > > >           <env key="NLS_LANG"
> > > > value="AMERICAN_AMERICA.UTF8"/>
> > > >        </exec>
> > > > 
> > > > Now everything works fine with the program
> > > > generating
> > > > a lot of output to the console.  This output
> is
> > > > useful
> > > > when the call initiated by a user, but we also
> > > have
> > > > an
> > > > automated CruiseControl process that uses the
> > same
> > > > targets to load it's database and the problem
> is
> > > > that
> > > > all that output (2k+ lines) ends up cluttering
> > the
> > > > final CC email that gets generated.
> > > > 
> > > > So is there any simple parameter that I can
> send
> > > to
> > > > the <exec> task to tell it to suppress sending
> > the
> > > > output the to System.out?
> > > > 
> > > > 
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> >
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