[nant-dev] Input redirection support to exec? was: [Nant-users] chmod a+x equivalent in nant?]

[Troy Laurin]

Just looking at this post to the nant-users list...
Would it be useful in general to be able to specify a file to redirect 
into standard input for an external program?  It would be pretty trivial 
to add an <input> element to ExternalProgramBase which could specify a 
source file to pipe through to standard input.

Or is this just patching symptoms, and dancing around the real feature 
(That I think I saw mentioned in the archives) of implementing pipes? 
If fork/join was added to ExternalProgramBase, then exec becomes composable:

<pipe file="input.txt" id="input" />
<exec program="munge" fork="true" pid="munge.pid">
  <input pipe="input" />
  <output pipe="munge.output" log="false" />
  <error log="true" />
</exec>
<property name="grep-tool" value="grep" if="${platform::is-unix()}" />
<property name="grep-tool" value="find" if="${platform::is-win32()}" />
<property name="grep-args" value="-i '${filter}'" 
if="${platform::is-unix()}" />
<property name="grep-args" value="/i &quot;${filter}&quot;" 
if="${platform::is-win32()}" />

<exec program="${grep-tool}" commandline="${grep-args}">
  <input pipe="munge.output" log="false" />
  <output file="output.txt" />
  <error log="true" />
</exec>
<!-- join is optional, since the 'find' program should terminate when 
its input pipe closes, so munge has already completed
<join>
  <pid value="${munge.pid}" />
</join>
-->

*Sample language, I'm sure it could be improved.
-------- Original Message --------
Subject: RE: [Nant-users] chmod a+x equivalent in nant?
Date: Thu, 12 Aug 2004 11:48:04 +0300
From: Hristo Deshev | telerik <[EMAIL PROTECTED]>
Reply-To: <[EMAIL PROTECTED]>
Organization: telerik
To: <[EMAIL PROTECTED]>
Hi Jeroen,
I am <exec>'ing the cacls.exe utility to change the permissions in a build
target.  Here's an example:
                <exec program="cmd.exe" workingdir=".">
                        <arg value="/c cacls" />
                        <arg value="${mdb.file}" />
                        <arg value="/E" />
                        <arg value="/G testpc\aspnet:F" />
                        <arg value="&lt; y.txt" />
                </exec>
Note the input redirection --> "< y.txt".  Cacls asks a dumb "are you sure"
question at the console, and the y.txt file contains just a "y" and a new
line symbol.
Hope this helps.
Hristo Deshev

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