Setup dotnet with preview version (e.g. 5.0 preview 2) about setup-dotnet

[litetex]

resolved in #80

[nietras]

@litetex I did try using the latest sdk version (as per https://dotnetcli.blob.core.windows.net/dotnet/release-metadata/5.0/releases.json) in yml but this fails e.g.:

    strategy:
      fail-fast: false
      matrix:
        os: [ ubuntu-latest, windows-latest, macos-latest ]
        dotnet: [ '5.0.100-preview.3.20216.6' ]
# ...
    - name: Setup .NET Core
      uses: actions/setup-dotnet@v1
      with:
        dotnet-version: ${{ runner.dotnet }}

Am I specifying it wrong? :) Seems like the ${{ runner.dotnet }} is not unfolded correctly...

[litetex]

Okay I see the problem now.

@nietras
At first:
You should use ${{ matrix.dotnet }} instead of ${{ runner.dotnet }}.
For more info checkout the docs

Second: it seems like the input is not validated correctly
→ https://github.com/litetex/ConsoleApp1/runs/618343455

Run actions/setup-dotnet@v1
with:

So dotnet is installed without any version information - clearly the workflow should fail now but it doesn't.
The following dotnet restore reads:

Run dotnet restore

Welcome to .NET Core 3.1!

Because the github vm's are set up with dotnet:
https://help.github.com/en/actions/reference/software-installed-on-github-hosted-runners
e.g.:
https://github.com/actions/virtual-environments/blob/master/images/linux/Ubuntu1804-README.md

The main error reason seems to be that https://github.com/actions/setup-dotnet/blob/master/action.yml

dotnet-version:
    description: 'SDK version to use. Example: 2.2.104'

does not match what's written in the source code

    //
    // Version is optional.  If supplied, install / use from the tool cache
    // If not supplied then task is still used to setup proxy, auth, etc...
    //

    let version = core.getInput('version');
    if (!version) {
      version = core.getInput('dotnet-version');
    }
    if (version) {
      const dotnetInstaller = new installer.DotnetCoreInstaller(version);
      await dotnetInstaller.installDotnet();
    }

    const sourceUrl: string = core.getInput('source-url');
    const configFile: string = core.getInput('config-file');
    if (sourceUrl) {
      auth.configAuthentication(sourceUrl, configFile);
    }
    // TODO: setup proxy from runner proxy config

    const matchersPath = path.join(__dirname, '..', '.github');
    console.log(`##[add-matcher]${path.join(matchersPath, 'csc.json')}`);
  } catch (error) {
    core.setFailed(error.message);
  }

[nietras]

You should use ${{ matrix.dotnet }} instead of ${{ runner.dotnet }}.

@litetex thanks, yes it seems the source I copied this from got it wrong. I got the preview working but now my issue is you cannot install multiple sdks it seems, closing this though since setting up a preview version is not a problem :)