How Can I read the taskExec output ?

[borgogelli]

Hi

some task, call a system command which produces some outputs.
Robo can prints out them on video but how can I store it in a var ?

For example

 $result = $this->taskExec('java -jar ' . $my_jar)
        ->background()
        ->run();

Can I extract the command output from the $result object ?

Thank you

Andrea

[Sweetchuck]

I think the $result->getMessage() will be you friend.

https://github.com/consolidation-org/Robo/blob/ff86b2cb870424dfdfd347cd2b7e180a2647ddd0/src/Task/Base/Exec.php#L154

[borgogelli]

Hi Sweetchuck ,
getMessage() sometimes returns an empty string like in following snippet:

$result = $this->taskSvnStack($svn_user, $svn_password)
        ->dir($path)
        ->exec("info")
        ->printed(true)
        ->run();

[Sweetchuck]

It gives a different result on success and on fail.
https://github.com/consolidation-org/Robo/blob/141bc9976e73201b93e9ee07c950951f239b278b/src/Task/CommandStack.php#L65

On success there is no information about the StdOut

[borgogelli]

Well, so how can I read the StdOut when task end successfully ? See the above example, where I'd like to read the output of the "svn info" command. I know that a task has a logger object linked. Could it be useful to read the StdOut ?

[greg-1-anderson]

Do you need access to stdout for tasks that perform an operation?

In your first example, you are using ->background() to run a Java server in the background. A Robo execTask is not a good way to monitor the output from a long-running background task. Use a log file, or run the process via the Symfony process component directly.

In the second example, a Robo taskExec is not a good way to obtain information about the system, e.g. when building your task objects. Instead, you should use the php exec function, or the Symfony Process component to call things such as svn info.

Use taskExec for commands that change the state of the system. When implementing a task that needs to exec a tool, then it is preferable to use ExecCommand or extend your class from CommandStack.

[borgogelli]

Thanks a lot Greg for clearing up the usage of "taskExec".
The confusion arises from the following example in the getting-start guide:
$this->taskExec('ls')->args($args )->run() ; (here I get information and I don't change the state of the system)
I think that your clarification will also be useful to other users .
Regards from Italy

[greg-1-anderson]

Good point -- we should change that example.

[geek-merlin]

I had that problem with current robo / openeuropa/task-runner, and the search engine directed me here.

What made me succeed was ->printOutput(false)like so:

    $hash = $this->taskExec('git rev-parse HEAD')
      ->printOutput(false)
      ->run()->stopOnFail()->getMessage();

[dgrothaus-mc]

    $hash = $this->taskExec('git rev-parse HEAD')
      ->printOutput(false)
      ->run()->stopOnFail()->getMessage();

You are the MVP. That helped a lot. Thank you.