Cannot index into a null array.

[jerodway]

Has anyone encountered this error:

PS C:\Users\rodwjam> wslcompact
WslCompact v7.0 2023.02.08
(C) 2023 Oscar Lopez
wslcompact -h for help. For more information visit: https://github.com/okibcn/wslcompact

Distro's name: Ubuntu
Image file: C:\Users\canso\AppData\Local\Packages\CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc\LocalState\ext4.vhdx
Current size: 28691 MB
Cannot index into a null array.
At C:\Users\canso\scoop\apps\wslcompact\current\wslcompact.ps1:79 char:17

• ... $estimated = ((wsl --system -d "$wsl_distro" -e df /mnt/w ...

•             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

  • CategoryInfo : InvalidOperation: (:) [], RuntimeException
  • FullyQualifiedErrorId : NullArray

Estimated size: 0 +/- 0 MB
The estimated process time using an SSD is about 0 minutes.

[okibcn]

@jerodway, do you have any special user configuration within your Ubuntu? the Estimated size is provided by wsl, so it might be a configuration colliding with it. Do you have other distros installed and running at the same time? It shouldn't be a issue, but I need more data to know what is going on in your system.

Please try these two commands from PowerShell:

wsl --system -d Ubuntu -e df /mnt/wslg/distro

wsl -d Ubuntu -e df /

And this one from within a WSL shell session inside Ubuntu:

\df /

They should return the same text, but for some reason, in your case, it is behaving differently. It would be nice if you copy-n-paste the output of these three tests into a reply here.

[jerodway]

Well, initially I could not get the first command to work at all. After a bit of playing around with it, I sorted out that problem and then wslcompact seemed to just start working. Sorry for bothering you

[okibcn]

@Aldo-f , we can continue the conversation here from the duplicated issue #8. It seems you have the same problem @jerodway had. I ask you to do the same test. We need to know what is going on.

@jerodway, maybe you could help with the solution you found in your system.

Thanks.

[okibcn]

@Aldo-f , these are the lines compatible with your distro's name. Do you have any special user configuration within your Ubuntu? the Estimated size is provided by wsl, so it might be a configuration colliding with it. Do you have other distros installed and running at the same time? It shouldn't be a issue, but I need more data to know what is going on in your system.

Please try these two commands from PowerShell:

wsl --system -d Ubuntu-18.04 -e df /mnt/wslg/distro

wsl -d Ubuntu-18.04 -e df /

And this one from within a WSL shell session inside Ubuntu-18.04:

\df /

They should return the same text, but for some reason, in your case, it is behaving differently. It would be nice if you copy-n-paste the output of these three tests into a reply here. Please.

[Aldo-f]

Not aware of any special configuration.
Installed Lando with Hyperspace (so that installs docker, lando, ...)

Seems GUI support is disabled on host, don't know if that's a requirement.

I could however use wslcompact to reduce my ext4.vhdx from 15GB to 13GB. (many thanks ;) )
(had to use $env:TEMP="D:\tmp" 'cause I'm out of space on C: )

> wslcompact
 WslCompact v8.0 2023.02.13
 (C) 2023 Oscar Lopez
 wslcompact -h for help. For more information visit: https://github.com/okibcn/wslcompact

 Distro's name:  Ubuntu-18.04
 Image file:     C:\Users\aldo\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu18.04onWindows_79rhkp1fndgsc\LocalState\ext4.vhdx
 Current size:   13479 MB
InvalidOperation: C:\Users\aldo\scoop\apps\wslcompact\current\wslcompact.ps1:79
Line |
  79 |  …             $estimated = ((wsl --system -d "$wsl_distro" -e df /mnt/w …
     |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Cannot index into a null array.
 Estimated size: 0 +/- 0 MB
 The estimated process time using an SSD is about 0 minutes.

> wsl --system -d Ubuntu-18.04 -e df /mnt/wslg/distro
GUI application support is disabled via C:\Users\aldo\.wslconfig or /etc/wsl.conf.
Error code: Wsl/Service/CreateInstance/WSL_E_GUI_APPLICATIONS_DISABLED

> wsl -d Ubuntu-18.04 -e df /
Filesystem      1K-blocks     Used Available Use% Mounted on
/dev/sdc       1055762868 13180200 988879196   2% /

Inside WSL

> \df /
Filesystem      1K-blocks     Used Available Use% Mounted on
/dev/sdc       1055762868 13180200 988879196   2% /

Details of my .wslconfig (GUI disabled)

# Settings apply across all Linux distros running on WSL 2
[wsl2]

# Limits VM memory to use no more than 4 GB, this can be set as whole numbers using GB or MB
memory=3GB 

# Sets the VM to use two virtual processors
# processors=2

# Specify a custom Linux kernel to use with your installed distros. The default kernel used can be found at https://github.com/microsoft/WSL2-Linux-Kernel
# kernel=C:\\temp\\myCustomKernel

# Sets additional kernel parameters, in this case enabling older Linux base images such as Centos 6
# kernelCommandLine = vsyscall=emulate

# Sets amount of swap storage space to 8GB, default is 25% of available RAM
swap=8GB

# Sets swapfile path location, default is %USERPROFILE%\AppData\Local\Temp\swap.vhdx
# swapfile=C:\\temp\\wsl-swap.vhdx

# Disable page reporting so WSL retains all allocated memory claimed from Windows and releases none back when free
# pageReporting=false

# Turn off default connection to bind WSL 2 localhost to Windows localhost
localhostforwarding=true

# Disables nested virtualization
nestedVirtualization=false

# Turns on output console showing contents of dmesg when opening a WSL 2 distro for debugging
debugConsole=false

# Disable use of GUI? 
guiApplications=false  # <------ this line

[okibcn]

Thanks!

Finally We know what is going on. With this info I am sure I will be able to solve the issue of size detection.

[okibcn]

Release 8.5 fixes the issue.

Thanks for helping with it.