Roll Observatory packages and add a roll script

packages/which/test/has_permission_test.dart

+
+library which.test.has_permission;
+
+import 'package:unittest/unittest.dart';
+import 'package:which/src/has_permission.dart';
+
+import 'util.dart';
+
+main() {
+  test('hasPermission', () {
+    var mode = parseBinary('010101010101');
+
+    expect(hasPermission(mode, FilePermission.SET_UID), isFalse);
+    expect(hasPermission(mode, FilePermission.SET_GID), isTrue);
+    expect(hasPermission(mode, FilePermission.STICKY), isFalse);
+    expect(hasPermission(mode, FilePermission.READ, role: FilePermissionRole.OWNER), isTrue);
+    expect(hasPermission(mode, FilePermission.WRITE, role: FilePermissionRole.OWNER), isFalse);
+    expect(hasPermission(mode, FilePermission.EXECUTE, role: FilePermissionRole.OWNER), isTrue);
+    expect(hasPermission(mode, FilePermission.READ, role: FilePermissionRole.GROUP), isFalse);
+    expect(hasPermission(mode, FilePermission.WRITE, role: FilePermissionRole.GROUP), isTrue);
+    expect(hasPermission(mode, FilePermission.EXECUTE, role: FilePermissionRole.GROUP), isFalse);
+    expect(hasPermission(mode, FilePermission.READ, role: FilePermissionRole.WORLD), isTrue);
+    expect(hasPermission(mode, FilePermission.WRITE, role: FilePermissionRole.WORLD), isFalse);
+    expect(hasPermission(mode, FilePermission.EXECUTE, role: FilePermissionRole.WORLD), isTrue);
+  });
+}