taskman_dotnet/dotnet.inc.php

<?php
namespace taskman;

class DotnetSupport
{
  static function install()
  {
    dotnet_install("8.0.0");
  }
}

task('dotnet_set_env', ['always' => true], function() { 
  dotnet_set_env();
});

task('dotnet_install', function() { 
  DotnetSupport::install();
});

function dotnet_install(string $version) 
{
  $has_dotnet = true;

  $dotnet_curr_ver = "";
  try 
  {
    $dotnet_curr_ver = shell_get("dotnet --version");
    print("DOTNET CURRENT VERSION: $dotnet_curr_ver\n");
  } 
  catch(\Throwable $th) 
  {
    $has_dotnet = false;
  }

  if($has_dotnet && version_compare($dotnet_curr_ver, $version) >= 0)
    return;

  print("DOTNET VERSION MISMATCH: $dotnet_curr_ver < $version\n");

  $install_file_path = dotnet_get_installer_path();

  $version_parts = explode('.', $version);
  $channel = $version_parts[0].'.'.$version_parts[1];
  if(is_win())
    shell("powershell -NoProfile -ExecutionPolicy unrestricted Invoke-Expression '\"$install_file_path\" -Channel $channel'");
  else
    shell("\"$install_file_path\" --channel $channel");
}

function dotnet_set_env() 
{  
  putenv("DOTNET_CLI_TELEMETRY_OPTOUT=1");

  $dotnet_path = dotnet_get_path();
  if(is_win())
    putenv("PATH=$dotnet_path;".getenv('PATH'));
  else
    putenv("PATH=$dotnet_path:".getenv('PATH'));
}

function dotnet_get_path()
{
  if(is_win())
  {
    $appdata_path = getenv('LOCALAPPDATA');
    return "$appdata_path\\Microsoft\\dotnet\\";
  }
  else
  {
    return getenv("HOME")."/.dotnet/";
  }
}

function dotnet_get_installer_path() : string 
{
  if(is_win())
    return __DIR__ . "/dotnet-install.ps1";
  else
    return __DIR__ . "/dotnet-install.sh";
}