Fix permissions set/get on Linux

Sources/SwiftNetrcCore/SwiftNetrc.swift

@@ -19,6 +19,9 @@ public final class SwiftNetrc {
 
         /// .netrc file isn't read-only
         case fileGroupOrWorldWritableOrExecutable
+
+        /// Couldn't read file permissions
+        case unableToReadFilePermissions
     }
 
     /// The URL to the .netrc file. Defaults to ~/.netrc
@@ -70,7 +73,10 @@ public final class SwiftNetrc {
         let attributes = try FileManager.default.attributesOfItem(atPath: netrcFile.path)
         // .netrc must be read and/or write for user only, so 600 or 400 are ok, nothing else.
         let okPermissions: Int16 = 0o600
-        guard (attributes[.posixPermissions] as! Int16 | okPermissions) == okPermissions else {
+        guard let filePerms = attributes[.posixPermissions] as? NSNumber else {
+            throw SwiftNetrcError.unableToReadFilePermissions
+        }
+        guard (filePerms.int16Value | okPermissions) == okPermissions else {
             throw SwiftNetrcError.fileGroupOrWorldWritableOrExecutable
         }
         let netrc = try String(contentsOf: netrcFile, encoding: .utf8)

Tests/LinuxMain.swift

@@ -0,0 +1,6 @@
+import XCTest
+@testable import SwiftNetrcTests
+
+XCTMain([
+     testCase(SwiftNetrcTests.allTests)
+])

Tests/SwiftNetrcTests/SwiftNetrcTests.swift

@@ -9,6 +9,19 @@ import XCTest
 
 class SwiftNetrcTests: XCTestCase {
 
+    /// For Linux
+    static var allTests = [
+        ("testRetrievesUsernameAndPassword", testRetrievesUsernameAndPassword),
+        ("testNetrcSetsFilePathOnInit",      testNetrcSetsFilePathOnInit     ),
+        ("testHandlesTwoMachines",           testHandlesTwoMachines          ),
+        ("testHandlesPassphrases",           testHandlesPassphrases          ),
+        ("testThrowsNoMachineSpecified",     testThrowsNoMachineSpecified    ),
+        ("testThrowsNoValueForToken",        testThrowsNoValueForToken       ),
+        ("testThrowsOnUnsafeFile",           testThrowsOnUnsafeFile          ),
+        ("testDoesntThrowWithGoodPermissions", testDoesntThrowWithGoodPermissions ),
+        ("testPerformanceExample",           testPerformanceExample          ),
+    ]
+
     override func setUp() {
         super.setUp()
         // Put setup code here. This method is called before the invocation of
@@ -219,7 +232,7 @@ class SwiftNetrcTests: XCTestCase {
     /// - Returns: `( callback, pathToFile )`, a tuple in which `callback` is a function to call that will remove
     ///     the test file and `pathToFile` is the path to the created file
     /// - Throws: Errors from `String` or `FileManager`
-    func writeNetrc(with content: String, to path: String = "/tmp/testnetrc", withPermissions perms: Int16 = 0o600) throws -> (() -> (), String) {
+    func writeNetrc(with content: String, to path: String = "/tmp/testnetrc", withPermissions perms: NSNumber = 0o600) throws -> (() -> (), String) {
         try content.write(toFile: path, atomically: true, encoding: .utf8)
         try FileManager.default.setAttributes([.posixPermissions: perms], ofItemAtPath: path)
         return ( { try? FileManager.default.removeItem(atPath: path)}, path )

sourcery/LinuxMain.stencil

@@ -0,0 +1,17 @@
+// sourcery:file:Tests/LinuxMain.swift
+import XCTest
+{{ argument.testimports }}
+
+{% for type in types.classes|based:"XCTestCase" %}
+{% if not type.annotations.disableTests %}extension {{ type.name }} {
+  static var allTests = [
+  {% for method in type.methods %}{% if method.parameters.count == 0 and method.shortName|hasPrefix:"test" %}  ("{{ method.shortName }}", {{ method.shortName }}),
+  {% endif %}{% endfor %}]
+}
+
+{% endif %}{% endfor %}
+
+XCTMain([
+{% for type in types.classes|based:"XCTestCase" %}{% if not type.annotations.disableTests %}  testCase({{ type.name }}.allTests),
+{% endif %}{% endfor %}])
+// sourcery:end