Fix tests on Linux

Sources/Extensions.swift

@@ -47,7 +47,7 @@ public extension Data {
     func write(to: Path, atomically: Bool = false) throws -> Path {
         let opts: NSData.WritingOptions
         if atomically {
-        #if os(macOS)
+        #if !os(Linux)
             opts = .atomicWrite
         #else
             opts = .atomic

Sources/Path+FileManager.swift

@@ -73,24 +73,37 @@ public extension Path {
         return try "".write(to: self)
     }
 
-    @inlinable
-    @discardableResult
-    public func mkdir() throws -> Path {
+    private func _foo(go: () throws -> Void) throws {
+    #if !os(Linux)
         do {
-            try FileManager.default.createDirectory(at: url, withIntermediateDirectories: false, attributes: nil)
+            try go()
         } catch CocoaError.Code.fileWriteFileExists {
             // noop
         }
+    #else
+        do {
+            try go()
+        } catch {
+            let error = error as NSError
+            guard error.domain == NSCocoaErrorDomain, error.code == CocoaError.Code.fileWriteFileExists.rawValue else {
+                throw error
+            }
+        }
+    #endif
+    }
+
+    @discardableResult
+    public func mkdir() throws -> Path {
+        try _foo {
+            try FileManager.default.createDirectory(at: self.url, withIntermediateDirectories: false, attributes: nil)
+        }
         return self
     }
 
-    @inlinable
     @discardableResult
     public func mkpath() throws -> Path {
-        do {
+        try _foo {
             try FileManager.default.createDirectory(at: url, withIntermediateDirectories: true, attributes: nil)
-        } catch CocoaError.Code.fileWriteFileExists {
-            // noop
         }
         return self
     }

Sources/TemporaryDirectory.swift

@@ -5,7 +5,7 @@ public class TemporaryDirectory {
     public var path: Path { return Path(string: url.path) }
 
     public init() throws {
-    #if os(macOS)
+    #if !os(Linux)
         url = try FileManager.default.url(for: .itemReplacementDirectory, in: .userDomainMask, appropriateFor: URL(fileURLWithPath: "/"), create: true)
     #else
         let envs = ProcessInfo.processInfo.environment