Re: [Nant-users] Creating/setting env variables

[Ian MacLean]

Eric Deslauriers wrote:
The docs could use a tad more detail:
http://nant.sourceforge.net/help/tasks/exec.html
Fortunately, this came to my aid.
http://www.mail-archive.com/nant-users@lists.sourceforge.net/msg05320.ht
ml
This is an OK solution for a limited # of execs, or a set of execs I can
kick of via foreach, but if I have to change variables between calls,
and the calls aren't ordered the same or aren't the same, it makes for
some long, repetitive sections. And since properties are immutable, I
don't think I can create the limited sets of <call>, set some values,
and make the calls?
 

what makes you think properties are immutable ?
Any sneaky/devious folk out there want to wade in (offlist is OK too)?
:)
 

well if its sneaky/devious you're after - the original link you posted 
is on the right track. Heres a slightly cleaner version using a custom task:
----------------------------------------------------------------------------------------------------------------------------------------------------------------
<script language="C#" >
           <imports>
               <import namespace="System.Runtime.InteropServices"/>
           </imports>
           <code><![CDATA[                
               [DllImport("kernel32.dll", SetLastError=true)]
               static extern bool SetEnvironmentVariable(string lpName, 
string lpValue);
              
               [TaskName("setenv")]
               public class SetEnvTask : Task {               

               private string _name;
               private string _value;
              
               [TaskAttribute("name", Required=true)]
               public string EnvName {
                   get { return _name; }
                   set { _name = value; }
               }
               [TaskAttribute("value", Required=true)]
               public string EnvValue {
                   get { return _value; }
                   set { _value = value; }
               }
              
               protected override void ExecuteTask() {
                   Log(Level.Info, "Setting env var {0} to {1}", 
EnvName, EnvValue );
                   if ( ! SetEnvironmentVariable(EnvName, EnvValue) ) {
                       throw new BuildException(string.Format("Error 
setting env var {0} to {1}", EnvName, EnvValue ) , Location);
                   }                   
               }       
       }
       ]]></code>
   </script>
        
   <!-- echo current value if it exists -->   
   <if test="${environment::variable-exists('X')}" >
       <echo message="X = ${environment::get-variable('X')}" />
   </if>
      
   <echo message="Setting new value"/>      
   <setenv name="X" value="test"/>
   <echo message="X = ${environment::get-variable('X')}" />       

----------------------------------------------------------------------------------------------------------------------------------------------------------------
This way you don't have to call a specific target - just use the custom 
<setenv> task. And its simple to set variables between calls to other tasks.

The above generates the following output:
Target(s) specified: build
  [script] Scanning assembly "00f_4pst" for extensions.
    [echo] Setting new value
  [setenv] Setting env var X to test
    [echo] X = test
build:
This is probably somthing worth considering adding to NAnt. Of course we 
would need to use platform #ifdefs as the above is windows specific.

Ian
Eric D
 

-----Original Message-----
From: Castro, Edwin Gabriel (Firing Systems Engr.)
   

[mailto:[EMAIL PROTECTED]
 

Sent: Wednesday, December 08, 2004 12:55 PM
To: Merrill Cornish; Eric Deslauriers; NAnt Users mailing list
Subject: RE: [Nant-users] Creating/setting env variables
.NET can, on the other hand, start a process with particular
   

environment
 

variables set. The <exec> task has an <environment> element for this
purpose. I use it to call devenv.exe and set the appropriate PATH,
INCLUDE, and LIB environment variable for that execution only.
   


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Discover which products truly live up to the hype. Start reading now. 
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