Merge pull request #4637 from haciek/du_threshold_err_fix

du: threshold error message fix

src/uu/du/src/du.rs

@@ -913,6 +913,11 @@ impl FromStr for Threshold {
         let size = parse_size(&s[offset..])?;
 
         if s.starts_with('-') {
+            // Threshold of '-0' excludes everything besides 0 sized entries
+            // GNU's du treats '-0' as an invalid argument
+            if size == 0 {
+                return Err(ParseSizeError::ParseFailure(s.to_string()));
+            }
             Ok(Self::Upper(size))
         } else {
             Ok(Self::Lower(size))

tests/by-util/test_du.rs

@@ -546,6 +546,15 @@ fn test_du_threshold() {
         .stdout_contains("deeper_dir");
 }
 
+#[test]
+fn test_du_invalid_threshold() {
+    let ts = TestScenario::new(util_name!());
+
+    let threshold = "-0";
+
+    ts.ucmd().arg(format!("--threshold={threshold}")).fails();
+}
+
 #[test]
 fn test_du_apparent_size() {
     let ts = TestScenario::new(util_name!());