Fix legacy CI (#1103)

* fix ci

* use official url

Author: TylerLeonhardt

PowerShellEditorServices.build.ps1

@@ -34,7 +34,7 @@ if ($PSVersionTable.PSEdition -ne "Core") {
 
 task SetupDotNet -Before Clean, Build, TestHost, TestServer, TestProtocol, TestPowerShellApi {
 
-    $minRequiredSdkVersion = "2.0.0"
+    $minRequiredSdkVersion = (Get-Content (Join-Path $PSScriptRoot 'global.json') | ConvertFrom-Json).sdk.version
 
     $dotnetPath = "$PSScriptRoot/.dotnet"
     $dotnetExePath = if ($script:IsUnix) { "$dotnetPath/dotnet" } else { "$dotnetPath/dotnet.exe" }
@@ -52,13 +52,8 @@ task SetupDotNet -Before Clean, Build, TestHost, TestServer, TestProtocol, TestP
 
     # Make sure the dotnet we found is the right version
     if ($dotnetExePath) {
-        # dotnet --version can return a semver that System.Version can't handle
-        # e.g.: 2.1.300-preview-01. The replace operator is used to remove any build suffix.
-        $version = [version]((& $dotnetExePath --version) -replace '[+-].*$','')
-        $maxRequiredSdkVersion = [version]::Parse("3.0.0")
-
-        # $minRequiredSdkVersion <= version < $maxRequiredSdkVersion
-        if ($version -ge [version]$minRequiredSdkVersion -and $version -lt $maxRequiredSdkVersion) {
+        # dotnet --version can write to stderr, which causes builds to abort, therefore use --list-sdks instead
+        if ((& $dotnetExePath --list-sdks | ForEach-Object { $_.Split()[0] }) -contains $requiredSdkVersion) {
             $script:dotnetExe = $dotnetExePath
         }
         else {
@@ -80,7 +75,7 @@ task SetupDotNet -Before Clean, Build, TestHost, TestServer, TestProtocol, TestP
 
         # Download the official installation script and run it
         $installScriptPath = "$([System.IO.Path]::GetTempPath())dotnet-install.$installScriptExt"
-        Invoke-WebRequest "https://raw.githubusercontent.com/dotnet/cli/v2.0.0/scripts/obtain/dotnet-install.$installScriptExt" -OutFile $installScriptPath
+        Invoke-WebRequest "https://dot.net/v1/dotnet-install.$installScriptExt" -OutFile $installScriptPath
         $env:DOTNET_INSTALL_DIR = "$PSScriptRoot/.dotnet"
 
         if (!$script:IsUnix) {

global.json

@@ -0,0 +1,5 @@
+{
+    "sdk": {
+        "version": "2.1.801"
+    }
+}