Set-Variable : Cannot process command because of one or more missing mandatory parameters: Name.

[Amedee Van Gasse]

I got this when connecting to a Windows node, how do I fix this?

[02/09/21 10:20:58] [SSH] SSH host key matches key seen previously for this host. Connection will be allowed.

[02/09/21 10:20:58] [SSH] Authentication successful.

[02/09/21 10:20:59] [SSH] The remote user's environment is:

Set-Variable : Cannot process command because of one or more missing mandatory parameters: Name.

At line:1 char:1

+ set

+ ~~~

    + CategoryInfo          : InvalidArgument: (:) [Set-Variable], ParameterBindingException

    + FullyQualifiedErrorId : MissingMandatoryParameter,Microsoft.PowerShell.Commands.SetVariableCommand

 

[02/09/21 10:21:00] [SSH] Checking java version of C:\Users\jenkins/jdk/bin/java

[02/09/21 10:21:01] [SSH] C:\Users\jenkins/jdk/bin/java -version returned 11.0.10.

[02/09/21 10:21:01] [SSH] Starting sftp client.

[02/09/21 10:21:01] [SSH] Copying latest remoting.jar...

[02/09/21 10:21:02] [SSH] Copied 1,521,553 bytes.

Expanded the channel window size to 4MB

[02/09/21 10:21:02] [SSH] Starting agent process: cd "C:\Users\jenkins" && C:\Users\jenkins/jdk/bin/java  -jar remoting.jar -workDir C:\Users\jenkins -jar-cache C:\Users\jenkins/remoting/jarCache

At line:1 char:23

+ cd "C:\Users\jenkins" && C:\Users\jenkins/jdk/bin/java  -jar remoting ...

+                       ~~

The token '&&' is not a valid statement separator in this version.

    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException

    + FullyQualifiedErrorId : InvalidEndOfLine

 

Agent JVM has terminated. Exit code=1

[02/09/21 10:21:02] Launch failed - cleaning up connection

[02/09/21 10:21:02] [SSH] Connection closed.

SSHLauncher{host='ec2-3-123-229-137.eu-central-1.compute.amazonaws.com', port=22, credentialsId='b56e65e1-beb0-4ad3-bcaa-e9c7aea3c4f8', jvmOptions='', javaPath='', prefixStartSlaveCmd='', suffixStartSlaveCmd='', launchTimeoutSeconds=60, maxNumRetries=10, retryWaitTime=15, sshHostKeyVerificationStrategy=hudson.plugins.sshslaves.verifiers.ManuallyTrustedKeyVerificationStrategy, tcpNoDelay=true, trackCredentials=true}

[02/09/21 10:21:02] [SSH] Opening SSH connection to ec2-3-123-229-137.eu-central-1.compute.amazonaws.com:22.

[02/09/21 10:21:03] [SSH] SSH host key matches key seen previously for this host. Connection will be allowed.

[02/09/21 10:21:03] [SSH] Authentication successful.

[02/09/21 10:21:03] [SSH] The remote user's environment is:

Set-Variable : Cannot process command because of one or more missing mandatory parameters: Name.

At line:1 char:1

+ set

+ ~~~

    + CategoryInfo          : InvalidArgument: (:) [Set-Variable], ParameterBindingException

    + FullyQualifiedErrorId : MissingMandatoryParameter,Microsoft.PowerShell.Commands.SetVariableCommand

 

[02/09/21 10:21:04] [SSH] Checking java version of C:\Users\jenkins/jdk/bin/java

[02/09/21 10:21:04] [SSH] C:\Users\jenkins/jdk/bin/java -version returned 11.0.10.

[02/09/21 10:21:04] [SSH] Starting sftp client.

[02/09/21 10:21:04] [SSH] Copying latest remoting.jar...

Source agent hash is D866F0B482DB94F38E49B26B465D5DB5. Installed agent hash is D866F0B482DB94F38E49B26B465D5DB5

Verified agent jar. No update is necessary.

Expanded the channel window size to 4MB

[02/09/21 10:21:09] [SSH] Starting agent process: cd "C:\Users\jenkins" && C:\Users\jenkins/jdk/bin/java  -jar remoting.jar -workDir C:\Users\jenkins -jar-cache C:\Users\jenkins/remoting/jarCache

At line:1 char:23

+ cd "C:\Users\jenkins" && C:\Users\jenkins/jdk/bin/java  -jar remoting ...

+                       ~~

The token '&&' is not a valid statement separator in this version.

    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException

    + FullyQualifiedErrorId : InvalidEndOfLine

 

Agent JVM has terminated. Exit code=1

[02/09/21 10:21:10] Launch failed - cleaning up connection

[02/09/21 10:21:10] [SSH] Connection closed.

connect timed out

SSH Connection failed with IOException: "connect timed out", retrying in 15 seconds. There are 2 more retries left.

connect timed out

SSH Connection failed with IOException: "connect timed out", retrying in 15 seconds. There are 1 more retries left.

connect timed out

ERROR: Connection is not established!

java.lang.IllegalStateException: Connection is not established!

at com.trilead.ssh2.Connection.getRemainingAuthMethods(Connection.java:988)

at com.cloudbees.jenkins.plugins.sshcredentials.impl.TrileadSSHPublicKeyAuthenticator.getRemainingAuthMethods(TrileadSSHPublicKeyAuthenticator.java:88)

at com.cloudbees.jenkins.plugins.sshcredentials.impl.TrileadSSHPublicKeyAuthenticator.canAuthenticate(TrileadSSHPublicKeyAuthenticator.java:80)

at com.cloudbees.jenkins.plugins.sshcredentials.SSHAuthenticator.newInstance(SSHAuthenticator.java:218)

at com.cloudbees.jenkins.plugins.sshcredentials.SSHAuthenticator.newInstance(SSHAuthenticator.java:171)

at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:865)

at hudson.plugins.sshslaves.SSHLauncher$1.call(SSHLauncher.java:436)

at hudson.plugins.sshslaves.SSHLauncher$1.call(SSHLauncher.java:423)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at java.lang.Thread.run(Thread.java:748)

[02/09/21 10:24:11] Launch failed - cleaning up connection

[02/09/21 10:24:11] [SSH] Connection closed.

[Amedee Van Gasse]

FYI PowerShell is the default SSH shell on this machine.

[Slide]

That will cause problems, the ssh-agents-plugin is not set up to handle PowerShell as the default shell. I looked into it a while back but didn't make good progress.

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[Slide]

FYI, I started to look at this again and will hopefully have a PR soon.

[Amedee Van Gasse]

That would actually be great and very much appreciated.

I've been down the rabbit hole a bit further and found something that may be of interest.

From what I've seen from the error, Jenkins sends compound shell commands to the node, with "&&" as pipeline chain operator.

"&&" has the same function in Bash as well as in MS-DOS.

PowerShell Windows (up to version 5 I guess) doesn't know '&&', there you have to use '-and'.

However, PowerShell 7 (PowerShell Core, the open source cross-platform version) does implement pipeline chain operators.

See https://docs.microsoft.com/en-us/powershell/scripting/whats-new/what-s-new-in-powershell-70?view=powershell-7

I don't know if that will solve all of the issues with PowerShell, but it's definitely worth giving a shot.

I'll try it out and report back here.

[Amedee Van Gasse]

I'm happy to report that Jenkins works fine with PowerShell 7!

I have this in my connection log:

[02/12/21 10:58:38] [SSH] SSH host key matches key seen previously for this host. Connection will be allowed.

[02/12/21 10:58:38] [SSH] Authentication successful.

[02/12/21 10:58:50] [SSH] The remote user's environment is:

[91mSet-Variable: [91mCannot process command because of one or more missing mandatory parameters: Name. [0m

[02/12/21 10:58:53] [SSH] Checking java version of C:\Users\jenkins/jdk/bin/java

[02/12/21 10:58:57] [SSH] C:\Users\jenkins/jdk/bin/java -version returned 11.0.10.

[02/12/21 10:58:57] [SSH] Starting sftp client.

[02/12/21 10:58:58] [SSH] Copying latest remoting.jar...

[02/12/21 10:58:59] [SSH] Copied 1,521,553 bytes.

Expanded the channel window size to 4MB

[02/12/21 10:58:59] [SSH] Starting agent process: cd "C:\Users\jenkins" && C:\Users\jenkins/jdk/bin/java  -jar remoting.jar -workDir C:\Users\jenkins -jar-cache C:\Users\jenkins/remoting/jarCache

Feb 12, 2021 9:59:02 AM org.jenkinsci.remoting.engine.WorkDirManager initializeWorkDir

INFO: Using C:\Users\jenkins\remoting as a remoting work directory

Feb 12, 2021 9:59:02 AM org.jenkinsci.remoting.engine.WorkDirManager setupLogging

INFO: Both error and output logs will be printed to C:\Users\jenkins\remoting

<===[JENKINS REMOTING CAPACITY]===>channel started

Remoting version: 4.5

This is a Windows agent

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by org.jenkinsci.plugins.envinject.service.EnvInjectMasterEnvVarsSetter to field java.lang.reflect.Field.modifiers

WARNING: Please consider reporting this to the maintainers of org.jenkinsci.plugins.envinject.service.EnvInjectMasterEnvVarsSetter

WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations

WARNING: All illegal access operations will be denied in a future release

Agent successfully connected and online

The Agent is connected, disconnect it before to try to connect it again.

The An illegal reflective access operation has occurred is probably something something Java 11, and I always ignore such warnings.

Maybe someone should consider reporting this to the maintainers of org.jenkinsci.plugins.envinject.service.EnvInjectMasterEnvVarsSetter? :-)

This is how I configured the node with Ansible:

- name: Install Win32-OpenSSH service

  win_chocolatey:

    name: openssh

    package_params: /SSHServerFeature

    state: present

  ignore_errors: yes

- name: Install Powershell Core

  win_chocolatey:

    name: powershell-core

    state: present

- name: Set the default SSH shell to PowerShell

  win_regedit:

    path: HKLM:\SOFTWARE\OpenSSH

    name: DefaultShell

    data: C:\Program Files\PowerShell\7\pwsh.exe

The ignore_errors: yes with openssh is because I use the same Ansible playbook for Packer (which goes to AWS) and Vagrant (which is for testing on my local machine), and the local VM already has SSH running and I haven't bothered yet with debugging that, so I just ignore the error when Chcoclatey can't install OpenSSH due to port 22 already in use.

But anyway: for anyone not using Ansible: you need to set the registry key HKLM:\SOFTWARE\OpenSSH to the full path of pwsh.exe.

Powershell legacy and Powershell Core have a different executable name, intentionally, so they can be used side-by-side.

I hope this is useful for anyone.

-- 

Amedee

[Amedee Van Gasse]

I just noticed that there is still an error:

Set-Variable: Cannot process command because of one or more missing mandatory parameters: Name.

That is because in Bash (Linux) and MS-DOS (Windows), you can just type set to get a list of all environment variables.

However, in PowerShell (cross-platform), the equivalent command is ls Env: (including the colon : at the end!)

If you type set in PowerShell, it interprets that as the cmdlet Set-Variable, which expects a mandatory parameter -Name.

Fortunately this is not a fatal error for the Jenkins connection, because it's just a debugging statement.

-- 

Amedee