Passing environment variables to a job

Updated September 27, 2016 18:26


Hi, I am trying to pass environment variables to an exec job:

<stage name="defaultStage">
  <jobs>
    <job name="defaultJob">
      <tasks>
        <exec command="/bin/echo" args="REVISION: ${GO_REVISION}" />
      </tasks>
</properties>
    </job>
  </jobs>
</stage>

The output:

[cruise] setting environment variable 'GO_REVISION' to value '7116'
REVISION: ${GO_REVISION}
Should this variable not be made available to the job?

Comments

8 comments

Anju Antony February 23, 2011 15:28

Hi Brett

You specify variables on an job by adding an <environmentvariables> section to the job definition.

<job name="my-job">
    <environmentvariables>
        <variable name="FOO">bar</variable>
        <variable name="MULTIPLE_LINES">Variable values can have
        multiple lines (assuming that your operating system supports this correctly).</variable>
        <variable name="COMPLEX"><![CDATA[<complex
        values>]]></variable>
    </environmentvariables>
    ...
</job>

So in your case it would look something like below

<jobs>
     <job name="defaultJob">      
        <environmentvariables>
         <variable name="REVISION">${GO_REVISION}</variable>
        </environmentvariables>
       <tasks>
         <exec command="/bin/echo" />
       </tasks>
     </job>

Ian Bridson February 23, 2011 16:23

Hi Brett

I think it is a syntax issue - The variable should be specified as %GO_REVISION% when passed in an argument. I can certainly use the revision variables when I specify them in this form

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Brett Cave February 24, 2011 09:29

Hi Ian,

Thanks for the comment. That would most likely be on a Windows platform. I forgot to mention that we are running a linux build environment.

Anju: testing now.

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Brett Cave February 24, 2011 09:46
Anju: I already had that config. Here is the relevant code snippet and output:

Configuration:

<pipeline name="Test">
<materials>
    <svn url="http://svn.mycompany.com/svn/PROJECT/trunk/component" username="username" password="password" autoUpdate="false" materialName="svn_material" />
</materials>
<stage name="Test">
    <jobs>
      <job name="test">
        <environmentvariables>
          <variable name="REVISION">${GO_REVISION_SVN_MATERIAL}</variable>
        </environmentvariables>
        <tasks>
          <exec command="/bin/echo" args="REVISION: $REVISION" />
        </tasks>
      </job>
    </jobs>
</stage>
</pipeline>

Output:
```
[cruise] setting environment variable 'GO_REVISION_SVN_MATERIAL' to value '7187'
[cruise] setting environment variable 'REVISION' to value '${GO_REVISION_SVN_MATERIAL}'
REVISION: $REVISION


As you can see, I have named my material. Go output indicates that it assigns GO_REVISION_SVN_MATERIAL
 a value of 7187 but that value is not assigned. I have tried with both ${VAR} syntax and  $VAR syntax.
```
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Rajesh Muppalla February 25, 2011 07:31

Hi Brett,

Since echo command does not understand environment variables, its the shell thats does the substitution, the exec task needs to have the command set as "bash" with echo and its arguments as argument. So your exec task now looks like

<exec command="/bin/bash" args="-c 'echo REVISION: $REVISION'"/> /* Notice the single quote around echo. That has stumped us (Go devs) a few times */

This would print - REVISION: ${GO_REVISION_SVN_MATERIAL}

But I guess you want REVISION: 7187 to be output, so you can change the exec task to

<exec command="/bin/bash" args="-c 'echo ${GO_REVISION_SVN_MATERIAL}'"/>

FWIW, for your scripts (shell, ANT, NANT), the environment variables that Go sets are available like any other system environment variables.

Hope this helps. Let me know if you need any further questions.

Regards,

Rajesh

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Brett Cave February 25, 2011 08:21
Ok, great. Thanks Rajesh, that does work. I think it would probably be best to then write system scripts or project-specific scripts and execute them, rather that doing it all directly.

What am I doing wrong here (this is declared within a <job> tag:

        <environmentvariables>
          <variable name="REVISION">${GO_REVISION_SVN_MATERIAL}</variable>
        </environmentvariables>

Output:
```
[cruise] setting environment variable 'GO_REVISION_SVN_MATERIAL' to value '7187'
[cruise] setting environment variable 'REVISION' to value '${GO_REVISION_SVN_MATERIAL}'
```
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Rajesh Muppalla February 25, 2011 09:37

Hi Brett,

In this case, Go is just assigning the value ${GO_REVISION_SVN_MATERIAL} to the REVISION environment variable and not substituting it. Go currently does not support recursive environment variable substitution.

To solve your problem, you can use the env. variable GO_REVISION_SVN_MATERIAL in your scripts directly.

However, if your scripts need the REVISION env. variable to be set and its value to be same as GO_REVISION_SVN_MATERIAL you can use this exec task (or do it in separate script)

<exec command="/bin/bash" args="-c 'REVISION=${GO_REVISION_SVN_MATERIAL}'"/>

Hope this helps.

Rajesh

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Brett Cave February 25, 2011 11:11

Ok great, thanks Rajesh.

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