[closes gh-69] Updated build to reuse last successful result if available.

#build/Build-All.ps1

@@ -2,8 +2,8 @@ Set-StrictMode -Version 2.0
 $ErrorActionPreference = 'Stop'
 $ProgressPreference = "SilentlyContinue" # https://www.amido.com/powershell-win32-error-handle-invalid-0x6/
 
-# Write-Host, Write-Error and Write-Warning do not function properly in Azure
-# So this mostly uses Write-Output for now
+# This mostly uses Write-Output because it was an Azure WebJob before, and Write-Warning/etc
+# didn't work properly in WebJobs
 $BuildRoslynBranchIfModified = Resolve-Path "$PSScriptRoot\Build-RoslynBranchIfModified.ps1"
 ."$PSScriptRoot\Setup-Build.ps1"
 
@@ -37,6 +37,17 @@ function ConvertTo-Hashtable([PSCustomObject] $object) {
     return $result
 }
 
+function Write-Success($object) {
+    $saved = $Host.UI.RawUI.ForegroundColor
+    try {
+        $Host.UI.RawUI.ForegroundColor = 'Green'
+        Write-Output "SUCCESS: $object"
+    }
+    finally {
+        $Host.UI.RawUI.ForegroundColor = $saved
+    }
+}
+
 # Code ------
 try {
     $Host.UI.RawUI.WindowTitle = "SharpLab Build" # prevents title > 1024 char errors
@@ -133,6 +144,7 @@ try {
             $siteRoot            = Ensure-ResolvedPath "$sitesRoot\$branchFsName"
             $branchArtifactsRoot = Ensure-ResolvedPath "$roslynArtifactsRoot\$branchFsName"
 
+            $branchBuildFailed = $false
             try {
                 &$BuildRoslynBranchIfModified `
                     -SourceRoot $repositorySourceRoot `
@@ -152,24 +164,6 @@ try {
                         }
                         Set-Content "$branchArtifactsRoot\BranchInfo.json" (ConvertTo-Json $branchInfo -Depth 100)
                     }
-
-                Write-Output "Copying Server\Web.config to $siteRoot\Web.config..."
-                Copy-Item "$sourceRoot\Server\Web.config" "$siteRoot\Web.config" -Force
-                
-                Write-Output "Resolving and copying assemblies..."
-                $resolverLogPath = "$branchArtifactsRoot\AssemblyResolver.log"
-                $resolverCommand = "&""$assemblyResolver""" +
-                  " --source-bin ""$sourceRoot\Server\bin\Release"" " +
-                  " --roslyn-bin ""$branchArtifactsRoot\Binaries""" +
-                  " --target ""$(Ensure-ResolvedPath $siteRoot\bin)""" +
-                  " --target-app-config ""$siteRoot\Web.config""" +
-                  " >> ""$resolverLogPath"""
-                $resolverCommand | Out-File $resolverLogPath -Encoding 'Unicode'
-                Invoke-Expression $resolverCommand
-                if ($LastExitCode -ne 0) {
-                    throw New-Object BranchBuildException("AssemblyResolver failed with code $LastExitCode, see $resolverLogPath.")
-                }
-                Write-Output "All done, looks OK."
             }
             catch {
                 $ex = $_.Exception
@@ -177,9 +171,43 @@ try {
                     throw
                 }
 
-                Write-Output "  [WARNING] $($ex.Message)"
+                $branchBuildFailed = $true
+                Write-Warning "$($ex.Message)"
                 Add-Content $failedListPath @("$branchFsName ($repositoryName)", $ex.Message, '')
             }
+
+            $branchBinariesPath = "$branchArtifactsRoot\Binaries"
+            if (!(Test-Path $branchBinariesPath)) {
+                Write-Warning "No binaries available, skipping further steps."
+                if (!$branchBuildFailed) {
+                    Add-Content $failedListPath @("$branchFsName ($repositoryName)", "No binaries found under $branchBinariesPath.", '')
+                }
+                return;
+            }
+
+            Write-Output "Copying Server\Web.config to $siteRoot\Web.config..."
+            Copy-Item "$sourceRoot\Server\Web.config" "$siteRoot\Web.config" -Force
+
+            Write-Output "Resolving and copying assemblies..."
+            $resolverLogPath = "$branchArtifactsRoot\AssemblyResolver.log"
+            $resolverCommand = "&""$assemblyResolver""" +
+              " --source-bin ""$sourceRoot\Server\bin\Release"" " +
+              " --roslyn-bin ""$branchBinariesPath""" +
+              " --target ""$(Ensure-ResolvedPath $siteRoot\bin)""" +
+              " --target-app-config ""$siteRoot\Web.config""" +
+              " >> ""$resolverLogPath"""
+            $resolverCommand | Out-File $resolverLogPath -Encoding 'Unicode'
+            Invoke-Expression $resolverCommand
+            if ($LastExitCode -ne 0) {
+                Write-Warning "AssemblyResolver failed with code $LastExitCode, see $resolverLogPath."
+                return
+            }
+            if (!$branchBuildFailed) {
+                Write-Success "All done, looks OK."
+            }
+            else {
+                Write-Warning "Branch build failed: using previous version."
+            }
         }
     }
 }

#build/Build-RoslynBranchIfModified.ps1

@@ -21,15 +21,18 @@ $newHash = (Invoke-Git $sourceRoot log "origin/$branchName" -n 1 --pretty=format
 if (Test-Path $hashMarkerPath) {
     $oldHash = [IO.File]::ReadAllText($hashMarkerPath)
     if ($oldHash -eq $newHash) {
-        Write-Output "Branch '$branchName' is up to date."
+        Write-Output "No changes since the last build."
         return
     }
 }
 
+[IO.File]::WriteAllText($hashMarkerPathFull, $newHash)
+
 Write-Output "Resetting '$branchName'..."
 
 Invoke-Git $sourceRoot checkout $branchName --force
 Invoke-Git $sourceRoot reset --hard origin/$branchName
+#Invoke-Git $sourceRoot clean --force
 if (Test-Path "$sourceRoot\Binaries") {
     Remove-Item "$sourceRoot\Binaries" -Recurse -Force
 }
@@ -52,21 +55,16 @@ function Build-Project(
     "  $projectPath $msbuildArgs" | Out-Default
 
     $projectPath = "$sourceRoot\$projectPath"
-    "    nuget restore" | Out-Default
-    nuget restore "$projectPath" >> "$buildLogPath"
-    if ($LastExitCode -ne 0) {
-        throw New-Object BranchBuildException("Build failed, see $buildLogPath", $buildLogPath)
-    }
-    
-    $msbuild = $env:MSBUILD_PATH
-    "    msbuild ($msbuild)" | Out-Default
-    Invoke-Expression ("&`"$msbuild`" `"$projectPath`" $msbuildArgs >> `"$buildLogPath`"")
+    "    dotnet restore" | Out-Default
+    dotnet restore "$projectPath" >> "$buildLogPath"
+    "    dotnet build" | Out-Default
+    Invoke-Expression ("dotnet build `"$projectPath`" $msbuildArgs >> `"$buildLogPath`"")
     if ($LastExitCode -ne 0) {
         throw New-Object BranchBuildException("Build failed, see $buildLogPath", $buildLogPath)
     }
 }
 
-$standardArgs = "/nodeReuse:false /m /p:RestorePackages=false /p:Configuration=Debug /p:DelaySign=false /p:SignAssembly=false /p:NeedsFakeSign=false /p:SolutionDir=`"$sourceRoot\Src`""
+$standardArgs = "/p:RestorePackages=false /p:Configuration=Debug /p:DelaySign=false /p:SignAssembly=false /p:NeedsFakeSign=false /p:SolutionDir=`"$sourceRoot\Src`""
 Build-Project "Src\Compilers\Core\Portable\CodeAnalysis.csproj" $standardArgs
 Build-Project "Src\Compilers\CSharp\Portable\CSharpCodeAnalysis.csproj" $standardArgs
 Build-Project "src\Features\CSharp\Portable\CSharpFeatures.csproj" $standardArgs
@@ -84,8 +82,6 @@ robocopy "$sourceRoot\Binaries\Debug" "$artifactsRoot\Binaries\Debug" `
     /xd "runtimes" `
     /mir /np
 
-[IO.File]::WriteAllText($hashMarkerPathFull, $newHash)
-
 Write-Output "  Build completed"
 
 if ($ifBuilt) {