test_sync.rs: don't depend on chmod

tests/by-util/test_sync.rs

@@ -63,37 +63,43 @@ fn test_sync_data_but_not_file() {
 }
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
-#[cfg(feature = "chmod")]
 #[test]
 fn test_sync_no_permission_dir() {
+    use std::os::unix::fs::PermissionsExt as _;
     use uutests::util::TestScenario;
     use uutests::util_name;
 
     let ts = TestScenario::new(util_name!());
     let at = &ts.fixtures;
     let dir = "foo";
     at.mkdir_all(dir);
+    let path = at.subdir.as_path().join(dir);
+    let mut perms = fs::metadata(&path).unwrap().permissions();
+    perms.set_mode(0o0);
+    fs::set_permissions(&path, perms).unwrap();
 
-    ts.ccmd("chmod").arg("0").arg(dir).succeeds();
     let result = ts.ucmd().arg("--data").arg(dir).fails();
     result.stderr_contains("sync: error opening 'foo': Permission denied");
     let result = ts.ucmd().arg(dir).fails();
     result.stderr_contains("sync: error opening 'foo': Permission denied");
 }
 
 #[cfg(not(windows))]
-#[cfg(feature = "chmod")]
 #[test]
 fn test_sync_no_permission_file() {
+    use std::os::unix::fs::PermissionsExt as _;
     use uutests::util::TestScenario;
     use uutests::util_name;
 
     let ts = TestScenario::new(util_name!());
     let at = &ts.fixtures;
     let f = "file";
     at.touch(f);
+    let path = at.subdir.as_path().join(f);
+    let mut perms = fs::metadata(&path).unwrap().permissions();
+    perms.set_mode(0o200);
+    fs::set_permissions(&path, perms).unwrap();
 
-    ts.ccmd("chmod").arg("0200").arg(f).succeeds();
     ts.ucmd().arg(f).succeeds();
 }