Powershell crashes microsoft/powershell docker container

Running Docker Edge on MAC OSX 10.12.6 From within iterm2 pulled microsoft/powershell:latest container. spin up the container ok and can docker exec into the container ok

run push in container to start powershell and receive the following output:

root@3d90889506e0:/# pwsh
PowerShell v6.0.2
Copyright (c) Microsoft Corporation. All rights reserved.

https://aka.ms/pscore6-docs
Type 'help' to get help.

PS />
Oops, something went wrong.  Please report this bug with the details below.
Report on GitHub: https://github.com/lzybkr/PSReadLine/issues/new
-----------------------------------------------------------------------
Last 0 Keys:


Exception:
System.DivideByZeroException: Attempted to divide by zero.
   at Microsoft.PowerShell.PSConsoleReadLine.Initialize(Runspace runspace, EngineIntrinsics engineIntrinsics)
   at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics)
-----------------------------------------------------------------------

Steps to reproduce

docker pull microsoft/powershell docker run --name=mypowershell -itd microsoft/powershell:latest docker exec -it mypowershell /bin/bash

type pwsh at prompt

[daxian-dbw]

My investigation shows that the DivideByZeroException exception is caused by having the container detached. When running docker run -itd to start the powershell container, since the container is detached, System.Console.BufferWidth and System.Console.BufferHeight are both 0, meaning the console windows doesn’t exist, and it’s actually a broken state. That leads to the DivideByZeroException.

I don’t think there is anything to fix in PSReadLine. As a workaround, if you need to start the container in a detached mode, then instead of using the default CMD, which is really just for interactive attached usage, just explicitly specify a command to prevent things from shutting down, such as

docker run --name=mypowershell -itd mcr.microsoft.com/powershell:latest pwsh -c "[console]::ReadKey()"

Then, you can run docker exec -it mypowershell /bin/bash or docker exec -it mypowershell pwsh

---

For the “Remote - Container” extension in VSCode, now the extension automatically adds a docker-compose.yml file to override the default CMD of a container image. The overriding command is just a loop, to prevents the container from shutting down.

    # Overrides default command so things don't shut down after the process ends.
    command: /bin/sh -c "while sleep 1000; do :; done"

So I think you don’t need to do anything extra, and it will just work. If the overriding command is not automatically added, then try adding it by yourself.

[JohnLBevan]

The issue seems to be with these lines: https://github.com/PowerShell/PSReadLine/blob/fd1265e385cb4b7b860d8f1452da1ceb347e123e/PSReadLine/Render.cs#L489-L498 i.e. as BufferWidth is zero.

Below’s some additional info (sadly copy-paste is not possible from the Docker for Desktop logs panel, where this info’s available).

### Environment 
PSReadLine: 2.1.0 
PowerShell: 7.1.1 
OS: Linux 4.19.104-microsoft-standard #1 SMP Wed Feb 19 06:37:35 UTC 2020 
BufferWidth: 0 
BufferHeight: 0 
Last 1 Keys 

<?>

### Exception 
System.DivideByZeroException: Attempted to divide by zero. 
at Microsoft.PowerShell.PSConsoleReadLine.PhysicalLineCount(Int32 columns, Boolean isFirstLogicalLine, Int32& lenLastPhysicalLine) 
at Microsoft.PowerShell.PSConsoleReadLine.ReallyRender(RenderData renderData, String defaultColor) 
at Microsoft.PowerShell.PSConsoleReadLine.ForceRender() 
at Microsoft.PowerShell.PSConsoleReadLine.Render() at Microsoft.PowerShell.PSConsoleReadLine.Insert(Chat c) 
at Microsoft.PowerShell.PSConsoleReadLine.SelfInsert(Nullable'l key, Object arg) 
at Microsoft.PowerShell.PSConsoleReadLine.ProcessOneKey(PSKeyInfo key, Dictionary'2 dispatchTable, Boolean ignoreIfNoAction, Object arg) 
at Microsoft.PowerShell.PSConsoleReadLine.InputLoop() 
at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, Enginelntrinsics engineIntrinsics, CancellationToken cancellationToken) 

PS /tmp> PS /tmp> 4Process terminated. The value must be greater than or equal to zero and less than the console's buffer size in that dimension. (Parameter 'top') 
Actual value was -1. 
at System.Environment. FailFast(System. String, System.Exception) 
at Microsoft. PowerShell.UnmanagedPSEntry. Start(System. String[], Int32) 
at Microsoft.PowerShell.ManagedPSEntry.Main(System.String[]) System.ArgumentOutOfRangeException: The value must be greater than or equal to zero and less than the console's buffer size in that dimension. (Parameter 'top') Actual value was -1. 
at System. Console.SetCursorPosition(Int32 left, Int32 top) 
at System. Console. set_CursorLeft(Int32 value) 
at Microsoft.PowerShell.ConsoleHostUserInterface.ReadLineFromConsole(Boolean endOnTab, String initialContent, Boolean calledFromPipeline, String& restOfLine, ReadLineResult& result) in /PowerShell/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterface.cs:line 1796 
at Microsoft.PowerShell.ConsoleHostUserInterface.ReadLine(Boolean endOnTab, String initialContent, ReadLineResult& result, Boolean calledFromPipeline, Boolean transcribeResult) in /PowerShell/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostUserInterface.cs:line 1431