Downgrade android/ios .NET 8 workload to specific version

[JeroenBer]

Android application type

.NET Android (net7.0-android, net8.0-android, etc.)

Affected platform version

.NET 8

Description

We accidentally updated our .NET 8 workload version by restoring a workload for another project.

Now on Windows our .NET8 Android workload version is:
34.0.1.94; git-rev-head:0d97e20; git-branch:release/8.0.2xx

We need to restore it to this version below because all our production releases are using this workload:
34.0.1.78; git-rev-head:87e4a6d; git-branch:release/8.0.1xx

Can anyone tell us exactly how to do this ?

Also we installed a new MacMini and because of some regression bugs for "ios" workload so we need to downgrade this from:

17.2.8053
to:
17.2.8022

There seems to be an option for dotnet workload restore --from-rollback-file for this ? But how do we determine the correct parameter for this ?

For professional development we need to be able to pin workloads. We first need to do some regression testing before bringing a new workload version into production.
Also we need to be able to specify the workload version we want to install, we want all our developers to use the same workload version and not use different versions or being forced to upgrade to the latest workload version.

Due to Xamarin upgrade experiences we first need to verify and test workload versions before updating them since they sometimes introduce new bugs. We also need to be able to revert to a previous version.

Steps to Reproduce

Not available

Did you find any workaround?

No

Relevant log output

No response

[jonathanpeppers]

--from-rollback-file is undocumented intentionally:

• Add workload install --from-rollback-file documentation docs#28226

But if you want to use it, you should be able to figure out the contents with:

> dotnet workload update --print-rollback
==workloadRollbackDefinitionJsonOutputStart==
{
  "microsoft.net.sdk.android": "34.0.95/8.0.100",
  "microsoft.net.sdk.ios": "17.2.8053/8.0.100",
  "microsoft.net.sdk.maccatalyst": "17.2.8053/8.0.100",
  "microsoft.net.sdk.macos": "14.2.8053/8.0.100",
  "microsoft.net.sdk.maui": "8.0.21/8.0.100",
  "microsoft.net.sdk.tvos": "17.2.8053/8.0.100",
  "microsoft.net.workload.mono.toolchain.current": "8.0.5/8.0.100",
  "microsoft.net.workload.emscripten.current": "8.0.5/8.0.100",
  "microsoft.net.workload.emscripten.net6": "8.0.5/8.0.100",
  "microsoft.net.workload.emscripten.net7": "8.0.5/8.0.100",
  "microsoft.net.workload.mono.toolchain.net6": "8.0.5/8.0.100",
  "microsoft.net.workload.mono.toolchain.net7": "8.0.5/8.0.100",
  "microsoft.net.sdk.aspire": "8.0.0/8.0.100"
}
==workloadRollbackDefinitionJsonOutputEnd==

Make a file like this named workload.json:

{
  "microsoft.net.sdk.android": "34.0.78/8.0.100"
}

Then dotnet workload install android --from-rollback workload.json should install 34.0.78.

Long term, they are making it where you can pin workload versions in global.json:

• Add design for simplifying workload versioning designs#294

Hope that helps! Closing for now, as this is probably an issue for dotnet/sdk, but I think this should get you what you need.