ls: Fix error message for ls /file/directory

Author: oech3

src/uu/ls/locales/en-US.ftl

@@ -22,6 +22,7 @@ ls-error-cannot-open-directory-bad-descriptor = cannot open directory {$path}: B
 ls-error-unknown-io-error = unknown io error: {$path}, '{$error}'
 ls-error-invalid-block-size = invalid --block-size argument {$size}
 ls-error-dired-and-zero-incompatible = --dired and --zero are incompatible
+ls-error-not-directory = cannot access {$path}: Not a directory
 ls-error-not-listing-already-listed = {$path}: not listing already-listed directory
 ls-error-invalid-time-style = invalid --time-style argument {$style}
   Possible values are:

src/uu/ls/src/ls.rs

@@ -185,6 +185,7 @@ enum LsError {
     IOError(#[from] std::io::Error),
 
     #[error("{}", match .1.kind() {
+		ErrorKind::NotADirectory => translate!("ls-error-not-directory", "path" => .0.quote()),
         ErrorKind::NotFound => translate!("ls-error-cannot-access-no-such-file", "path" => .0.quote()),
         ErrorKind::PermissionDenied => match .1.raw_os_error().unwrap_or(1) {
             1 => translate!("ls-error-cannot-access-operation-not-permitted", "path" => .0.quote()),

tests/by-util/test_ls.rs

@@ -57,6 +57,18 @@ const COMMA_ARGS: &[&str] = &["-m", "--format=commas", "--for=commas"];
 
 const COLUMN_ARGS: &[&str] = &["-C", "--format=columns", "--for=columns"];
 
+#[test]
+#[cfg(unix)]
+fn test_directory_in_file() {
+    let scene = TestScenario::new(util_name!());
+
+    scene
+        .ucmd()
+        .arg("/sbin/init/dir")
+        .fails_with_code(2)
+        .stderr_is("ls: cannot access '/sbin/init/dir': Not a directory\n");
+}
+
 #[test]
 fn test_invalid_flag() {
     new_ucmd!()