Problem spawning background process from Groovy script

[Dirk Heinrichs]

Hi,

I've got a job that runs a Groovy script which should pull from a Mercurial repo, merge a given branch and then serve the result to sub jobs running in a multijob phase to perform builds on different OS's. For this to achieve, the script should spawn a "hg serve" process into the background. Once the Multijob phases have finished, another script should then kill that process again.

That works fine as long as I execute the Groovy script standalone (the script finishes and the background process keeps running). But if executed from Jenkins, the "hg serve" process is killed when the script finishes, which is of course not what I want.

How can I spawn a background process from a Groovy script in Jenkins so that it's still running when the script ends?

Here's my script:

// The repo clone is in directory "merge" in the workspace

def port = "9000"

def builder = new ProcessBuilder(["hg", "serve", "-p", port])

builder.redirectErrorStream(true)

builder.directory(new File("merge"))

def proc = builder.start()

Happens regardless of the slaves OS. Jenkins version is 2.32.1 (in case it matters).

Thanks a lot...

    Dirk

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Dirk Heinrichs
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[Dirk Heinrichs]

On 09.03.2017 13:23, Dirk Heinrichs wrote:

How can I spawn a background process from a Groovy script in Jenkins so that it's still running when the script ends?

OK, nevermind. Seems the background process is killed because the job's next step failed (which is OK).

Bye...

[Christopher Orr]

On Thu, 9 Mar 2017, at 13:23, Dirk Heinrichs wrote:
> Hi,
>
> I've got a job that runs a Groovy script which should pull from a
> Mercurial repo, merge a given branch and then serve the result to sub
> jobs running in a multijob phase to perform builds on different OS's.
> For this to achieve, the script should spawn a "hg serve" process into
> the background. Once the Multijob phases have finished, another script
> should then kill that process again.
>
> That works fine as long as I execute the Groovy script standalone (the
> script finishes and the background process keeps running). But if
> executed from Jenkins, the "hg serve" process is killed when the script
> finishes, which is of course not what I want.
>
> How can I spawn a background process from a Groovy script in Jenkins so
> that it's still running when the script ends?

Sounds like
https://wiki.jenkins-ci.org/display/JENKINS/Spawning+processes+from+build