How is it possible to run this PowerShell script inside a docker container?

Question

I'm trying to run the below script (myscript.ps1) inside a Windows Docker container without actually copying the script file to the container.

$Source =  @"
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;

public static class Imagehlp
{
    [DllImport("imagehlp.dll", CharSet = CharSet.Auto)]
    public static extern int MapFileAndCheckSum(string Filename, out int HeaderSum, out int CheckSum);
}
"@
Add-Type -TypeDefinition $Source

[int] $headerSum = 0;
[int] $checkSum = 0;
$result = [Imagehlp]::MapFileAndCheckSum(
    "C:\Program Files\Internet Explorer\iexplore.exe",
    [ref] $headerSum,
    [ref] $checkSum
    )

 if ($result -ne 0) {
     Write-Error "Error: $result"
    }
 $headerSum, $checkSum

First, I have searched online for the answer and tried the solution in here. However, when I tried the given solution, I got the error below.

docker exec my-windows powershell -command "C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1"

C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1 : The term 
'C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1' is not
recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify
that the path is correct and try again.
At line:1 char:1
+ C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Users\abc...yscript.p
   s1:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

The reason for this error is probably because the script is in the host not in the container. Therefore, I have tried to save the script content into a variable in PowerShell and then tried to run the command with the variable.

$script1 = Get-Content ('C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1')
docker exec my-windows powershell -command $script1

This time I get the following error.

At line:1 char:15
+ $Source =  @" using System; using System.Diagnostics; using System.Ru ...
+               ~
No characters are allowed after a here-string header but before the end of the
line.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordEx
   ception
    + FullyQualifiedErrorId : UnexpectedCharactersAfterHereStringHeader

It says that the here-string part of my script is not properly typed and there exists another character after @" but there is no character after that. I'm guessing this is something related to newline or carriage return characters but I'm not sure. Can you please help me? Thanks a bunch!

Mathias R. Jessen · Accepted Answer · 2020-09-08 13:01:04Z

2

For this, I'd suggest taking advantage of powershell.exe's -EncodedCommand switch

# Load script contents from disk
$script1 = Get-Content 'C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1' -Raw
# UTF16LE-encode the script
$bytes = [System.Text.Encoding]::Unicode.GetBytes($script1)
# Convert encoded byte string to b64
$encodedCommand = [Convert]::ToBase64String($bytes)

docker exec my-windows powershell -encodedcommand $encodedCommand

Beware that Windows' process API's limit the length of command line arguments to 8191 characters, so it only works for scripts of less than ~3050 characters (including whitespace)

edited Sep 8, 2020 at 13:01

answered Sep 8, 2020 at 10:25

Mathias R. Jessen

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3 Comments

egkmor Over a year ago

Thanks @Mathias for the quick reply, I have tried your solution but I still get the same error. I have edited the post with the newer error. Maybe this error is related to saving a script to a variable and then calling the script via the variable. Is this possible?

Mathias R. Jessen Over a year ago

@grcrtrkm Looks like PowerShell takes issue with the line breaks in the @""@ here-string being LF and not CRLF, try $script1 = $script1 -replace '\r?\n',"`r`n" before GetBytes()

egkmor Over a year ago

OK, now I got it but I had to call get-content with -raw flag to ensure that the script is saved into a variable properly. Can you please edit your answer like below. Thanks for the help, appreciated! $script1 = Get-Content -raw ('C:\Users\abc\Desktop\PowerShellScripts\myscript.ps1')

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