print_numeric: print mode in octal when the mode is too large

src/uucore/src/lib/features/mode.rs

@@ -18,7 +18,7 @@ pub fn parse_numeric(fperm: u32, mut mode: &str, considering_dir: bool) -> Resul
         u32::from_str_radix(mode, 8).map_err(|e| e.to_string())?
     };
     if change > 0o7777 {
-        Err(format!("mode is too large ({change} > 7777"))
+        Err(format!("mode is too large ({change:o} > 7777)"))
     } else {
         Ok(match op {
             Some('+') => fperm | change,

tests/by-util/test_chmod.rs

@@ -283,6 +283,34 @@ fn test_chmod_error_permissions() {
     );
 }
 
+#[test]
+fn test_chmod_permissions_too_large() {
+    let scenario = TestScenario::new(util_name!());
+    let at = &scenario.fixtures;
+
+    at.touch("file");
+
+    scenario
+        .ucmd()
+        .args(&["10777", "file"])
+        .fails_with_code(1)
+        .stderr_is(
+            // spell-checker:disable-next-line
+            "chmod: mode is too large (10777 > 7777)\n",
+        );
+    // test around the boundary of the acceptable octal mode
+    scenario
+        .ucmd()
+        .args(&["10000", "file"])
+        .fails_with_code(1)
+        .stderr_is(
+            // spell-checker:disable-next-line
+            "chmod: mode is too large (10000 > 7777)\n",
+        );
+    at.mkdir("dir");
+    scenario.ucmd().args(&["7777", "dir"]).succeeds();
+}
+
 #[test]
 #[allow(clippy::unreadable_literal)]
 fn test_chmod_ugo_copy() {