du: ignore duplicate names with --files0-from

src/uu/du/src/du.rs

@@ -629,7 +629,10 @@ fn read_files_from(file_name: &str) -> Result<Vec<PathBuf>, std::io::Error> {
             show_error!("{file_name}:{line_number}: invalid zero-length file name");
             set_exit_code(1);
         } else {
-            paths.push(PathBuf::from(String::from_utf8_lossy(&path).to_string()));
+            let p = PathBuf::from(String::from_utf8_lossy(&path).to_string());
+            if !paths.contains(&p) {
+                paths.push(p);
+            }
         }
     }
 

tests/by-util/test_du.rs

@@ -1010,6 +1010,21 @@ fn test_du_files0_from() {
         .stdout_contains("testdir");
 }
 
+#[test]
+fn test_du_files0_from_ignore_duplicate_file_names() {
+    let ts = TestScenario::new(util_name!());
+    let at = &ts.fixtures;
+    let file = "testfile";
+
+    at.touch(file);
+    at.write("filelist", &format!("{file}\0{file}\0"));
+
+    ts.ucmd()
+        .arg("--files0-from=filelist")
+        .succeeds()
+        .stdout_is(format!("0\t{file}\n"));
+}
+
 #[test]
 fn test_du_files0_from_with_invalid_zero_length_file_names() {
     let ts = TestScenario::new(util_name!());
@@ -1046,6 +1061,23 @@ fn test_du_files0_from_stdin() {
         .stdout_contains("testfile2");
 }
 
+#[test]
+fn test_du_files0_from_stdin_ignore_duplicate_file_names() {
+    let ts = TestScenario::new(util_name!());
+    let at = &ts.fixtures;
+    let file = "testfile";
+
+    at.touch(file);
+
+    let input = format!("{file}\0{file}");
+
+    ts.ucmd()
+        .arg("--files0-from=-")
+        .pipe_in(input)
+        .succeeds()
+        .stdout_is(format!("0\t{file}\n"));
+}
+
 #[test]
 fn test_du_files0_from_stdin_with_invalid_zero_length_file_names() {
     new_ucmd!()