Hudson cannot find powershell after update to powershell 3

Question

One of my jobs had need for the ConvertTo-Json commandlet available in powershell 3.0 So I installed WMF 3.0 on our Windows Server 2008 R2 (SP1) box. After a restart all my powershell using jobs result in the error:

[workspace] $ powershell.exe "& 'C:\Users\HUDSON~1\AppData\Local\Temp\hudson1263303013566726397.ps1'"
The system cannot find the file specified
FATAL: command execution failed
java.io.IOException: Cannot run program "powershell.exe" (in directory "C:\hudson\jobs\MyProject\workspace"): CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    at hudson.Proc$LocalProc.<init>(Proc.java:192)
    at hudson.Proc$LocalProc.<init>(Proc.java:164)
    at hudson.Launcher$LocalLauncher.launch(Launcher.java:639)
    at hudson.Launcher$ProcStarter.start(Launcher.java:274)
    at hudson.Launcher$ProcStarter.join(Launcher.java:281)
    at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:84)
    at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:60)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
    at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:630)
    at hudson.model.Build$RunnerImpl.build(Build.java:175)
    at hudson.model.Build$RunnerImpl.doRun(Build.java:137)
    at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:429)
    at hudson.model.Run.run(Run.java:1366)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
    at hudson.model.ResourceController.execute(ResourceController.java:88)
    at hudson.model.Executor.run(Executor.java:145)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(ProcessImpl.java:188)
    at java.lang.ProcessImpl.start(ProcessImpl.java:132)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1021)
    ... 16 more

Running powershell.exe from the cmd prompt works just fine.

What happened? How do I fix this?

I am using the Powershell Plugin to launch the scripts and I cannot find any configuration area for it.

Answer 1

After a day's worth of hassle we found the answer. We're still not sure exactly why it happened but the powershell directory disappeared from Hudson's path. Then, although PS3 was installed and the machine had been restarted, Hudson for some reason had not picked up the new PATH variable.

Manually shutting down and restarting Hudson finally got it to pick up the correct PATH and fixed the issue.