CODEWITHSUNDEEP
windowsdockerazure-batch
Richard
Richard

Reputation: 69

Azure batch windows container workloads remove quotes from provided command line

When using windows container workloads on Azure Batch quotes are stripped from command line arguments if they do not contain a space.

We are using the newest C# SDK 13.0.0 and node VMs SKU windows server 2019 with containers.

Repro: Create job and a task running inside a docker container (e.g. based on the docker image mcr.microsoft.com/windows/servercore:ltsc2019) use command line of cmd /S /C mkdir "c:/foo" - see that inside the docker container the command is executed as cmd /S /C mkdir c:/foo - which will fail.

The same issue is described in this open containers PR: https://github.com/opencontainers/runtime-spec/commit/deb4d954eafc4fc65f04c00a08e08c3e69df32d0

Edit: I realized that this was more as statement than a question... so here is the question: What is a workaround/fix for this behavior?

Edit powershell -EncodedCommand Solution: I accepted the environment variable solution but we are using a different one. We use "https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_powershell_exe?view=powershell-5.1#-encodedcommand-base64encodedcommand" - doing so hides quotes and backslashes from CommandLineToArgsvW and docker - meaning the commandline gets put together properly inside the docker container on the azure batch vm. (In C# this is done by var base64EncodedCmd = System.Convert.ToBase64String(System.Text.Encoding.Unicode.GetBytes(cmd));) Take care to escape powershell properly as well. e.g. the encoded command could be something lik "& my.exe --% --input \\\"userprovidedparam\\"" (using powershells "stop parsing" --%) otherwise e.g. a value of $(Get-Date) would be evaluated

Upvotes: 1

Views: 179

Answers (1)

fpark
fpark

Reputation: 2369

Given this is an issue with the runtime, a potential workaround is to create a .cmd or .bat file that contains the commands you would like to run. You can associate this file as a ResourceFile or bake it into a custom container.

Upvotes: 3

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