Add basic support for plugins in swift-bootstrap script (#8128)

Add basic support for plugins to swift-bootstrap so that any plugins
added to dependencies aren't silently dropped from the build plan, which
could cause confusing errors related to nonexistent targets.

Author: owenv

Sources/SPMBuildCore/CMakeLists.txt

@@ -18,6 +18,7 @@ add_library(SPMBuildCore
   BuildSystem/BuildSystemCommand.swift
   BuildSystem/BuildSystemDelegate.swift
   BuiltTestProduct.swift
+  Plugins/DefaultPluginScriptRunner.swift
   Plugins/PluginContextSerializer.swift
   Plugins/PluginInvocation.swift
   Plugins/PluginMessages.swift

Sources/Workspace/DefaultPluginScriptRunner.swift renamed to Sources/SPMBuildCore/Plugins/DefaultPluginScriptRunner.swift

@@ -16,7 +16,6 @@ import Basics
 import Foundation
 import PackageGraph
 import PackageModel
-import SPMBuildCore
 
 import struct TSCBasic.ByteString
 import struct Basics.AsyncProcessResult

Sources/Workspace/CMakeLists.txt

@@ -8,7 +8,6 @@
 
 add_library(Workspace
   CheckoutState.swift
-  DefaultPluginScriptRunner.swift
   Diagnostics.swift
   InitPackage.swift
   LoadableResult.swift

Sources/swift-bootstrap/main.swift

@@ -314,12 +314,25 @@ struct SwiftBootstrapBuildTool: AsyncParsableCommand {
 
             switch buildSystem {
             case .native:
+                let pluginScriptRunner = DefaultPluginScriptRunner(
+                    fileSystem: self.fileSystem,
+                    cacheDir: scratchDirectory.appending("plugin-cache"),
+                    toolchain: self.hostToolchain,
+                    extraPluginSwiftCFlags: [],
+                    enableSandbox: true,
+                    verboseOutput: self.logLevel <= .info
+                )
                 return BuildOperation(
                     // when building `swift-bootstrap`, host and target build parameters are the same
                     productsBuildParameters: buildParameters,
                     toolsBuildParameters: buildParameters,
                     cacheBuildManifest: false,
                     packageGraphLoader: asyncUnsafePackageGraphLoader,
+                    pluginConfiguration: .init(
+                        scriptRunner: pluginScriptRunner,
+                        workDirectory: scratchDirectory.appending(component: "plugin-working-directory"),
+                        disableSandbox: false
+                    ),
                     scratchDirectory: scratchDirectory,
                     // When bootrapping no special trait build configuration is used
                     traitConfiguration: nil,
@@ -390,14 +403,7 @@ struct SwiftBootstrapBuildTool: AsyncParsableCommand {
                 },
                 binaryArtifacts: [:],
                 fileSystem: fileSystem,
-                observabilityScope: observabilityScope,
-                // Plugins can't be used in bootstrap builds, exclude those.
-                productsFilter: {
-                    $0.type != .plugin
-                },
-                modulesFilter: {
-                    $0.type != .plugin
-                }
+                observabilityScope: observabilityScope
             )
         }