Fixed Glob crash (#1181)

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Next Version
 
+### Fixed
+
+- Fixed crash caused by a simultaneous write during a glob processing [#1177](https://github.com/yonaskolb/XcodeGen/issues/1177) @tr1ckyf0x
+
 ## 2.26.0
 
 ### Added

Sources/XcodeGenCore/Atomic.swift

@@ -0,0 +1,27 @@
+//
+//  Atomic.swift
+//  
+//
+//  Created by Vladislav Lisianskii on 23.02.2022.
+//
+
+import Foundation
+
+@propertyWrapper
+struct Atomic<Value> {
+    private let queue = DispatchQueue(label: "com.xcodegencore.atomic")
+    private var value: Value
+
+    init(wrappedValue: Value) {
+        self.value = wrappedValue
+    }
+
+    var wrappedValue: Value {
+        get {
+            return queue.sync { value }
+        }
+        set {
+            queue.sync { value = newValue }
+        }
+    }
+}

Sources/XcodeGenCore/Glob.swift

@@ -57,7 +57,7 @@ public class Glob: Collection {
 
     public static let defaultBlacklistedDirectories = ["node_modules", "Pods"]
 
-    private var isDirectoryCache = [String: Bool]()
+    @Atomic private var isDirectoryCache = [String: Bool]()
 
     public let behavior: Behavior
     public let blacklistedDirectories: [String]