Exception "Value connot be null"

[derekmpage]

I receive an exception when trying to run this utility.

note I am using ssh certificates.

me@wsl2_host ~/cat .zshrc | grep wsl2
eval $($HOME/wsl2-ssh-agent)

Do you have any idea what's happening here?

 me@wsl2_host$ ~/ ./wsl2-ssh-agent --verbose --foreground
[L] 2024/03/26 16:30:22 start listening on /home/me/.ssh/wsl2-ssh-agent.sock
[L] 2024/03/26 16:30:22 invoking [W] in PowerShell.exe
[W] 2024/03/26 16:30:23 ssh-agent.exe version: 8.6.0.1 (ignoreOpenSSHExtensions: True)
[L] 2024/03/26 16:30:23 [W] invoked successfully
[W] 2024/03/26 16:30:23 ready: PSVersion 5.1.22621.2506
[L] 2024/03/26 16:30:28 ssh: connected
[L] 2024/03/26 16:30:28 ssh -> [L] (5 B)
[L] 2024/03/26 16:30:28 [L] -> [W] (5 B)
[W] 2024/03/26 16:30:28 [W] named pipe: connected
[W] 2024/03/26 16:30:28 [L] -> [W] -> ssh-agent.exe (5 B)
[L] 2024/03/26 16:30:28 [L] <- [W] (9 B)
[L] 2024/03/26 16:30:28 ssh <- [L] (9 B)
[W] 2024/03/26 16:30:28 [L] <- [W] <- ssh-agent.exe (9 B)
[W] 2024/03/26 16:30:28 [W] named pipe: disconnected
[L] 2024/03/26 16:30:42 ssh -> [L] (747 B)
[L] 2024/03/26 16:30:42 [L] -> [W] (747 B)
[W] 2024/03/26 16:30:42 [W] named pipe: connected
[W] 2024/03/26 16:30:42 [L] -> [W] -> ssh-agent.exe (747 B)
[W] 2024/03/26 16:30:42 [W] named pipe: disconnected
wsl2-ssh-agent.ps1: terminated
Exception calling "Write" with "3" argument(s): "Value cannot be null.
Parameter name: buffer"
At line:33 char:5
+                 $ssh_client_out.Write($buf, 0, $buf.Length)
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentNullException

[L] 2024/03/26 16:30:52 failed to read from [W]: read |0: i/o timeout
[L] 2024/03/26 16:30:52 [W] terminated; retry
[L] 2024/03/26 16:30:52 invoking [W] in PowerShell.exe
[W] 2024/03/26 16:30:53 ssh-agent.exe version: 8.6.0.1 (ignoreOpenSSHExtensions: True)
[L] 2024/03/26 16:30:53 [W] invoked successfully
[L] 2024/03/26 16:30:53 [L] -> [W] (747 B)
[W] 2024/03/26 16:30:53 ready: PSVersion 5.1.22621.2506
[W] 2024/03/26 16:30:53 [W] named pipe: connected
[W] 2024/03/26 16:30:53 [L] -> [W] -> ssh-agent.exe (747 B)
[W] 2024/03/26 16:30:53 [W] named pipe: disconnected
wsl2-ssh-agent.ps1: terminated
Exception calling "Write" with "3" argument(s): "Value cannot be null.
Parameter name: buffer"
At line:33 char:5
+                 $ssh_client_out.Write($buf, 0, $buf.Length)
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentNullException

[mame]

@Hill-98 Could you please check this out? Looks like ReadMessage returns null, but I don't see how that could happen. TBH I'm not familiar enough with PowerShell.

[Hill-98]

I'm not familiar too, but my guess is that it might be because there was an error in ReadMessage, but PowerShell doesn't abort by default when it encounters an error, so $buf gets a null.

[mame]

@derekmpage Can you try 0.9.2 (the older version) of wsl2-ssh-agent?

https://github.com/mame/wsl2-ssh-agent/releases/tag/v0.9.2

If the problem is not reproduced there, I suspect it is caused by the changes in #7. I guess I'll just have to revert.

[mame]

No reply, so I'll close it for now. If you find that the issue does not reproduce with 0.9.2, please let me know.