mv: show file mode in interactive prompt for read-only targets

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

@@ -61,6 +61,7 @@ mv-debug-skipped = skipped {$target}
 
 # Prompt messages
 mv-prompt-overwrite = overwrite {$target}?
+mv-prompt-overriding-mode = overwrite {$target}, overriding mode {$mode} ({$mode_str})?
 
 # Progress messages
 mv-progress-moving = moving

src/uu/mv/locales/fr-FR.ftl

@@ -59,6 +59,7 @@ mv-debug-skipped = ignoré {$target}
 
 # Messages de confirmation
 mv-prompt-overwrite = écraser {$target} ?
+mv-prompt-overriding-mode = écraser {$target}, en ignorant le mode {$mode} ({$mode_str}) ?
 
 # Messages de progression
 mv-progress-moving = déplacement

src/uu/mv/src/mv.rs

@@ -732,10 +732,44 @@ fn rename(
                 return Ok(());
             }
             OverwriteMode::Interactive => {
-                if !prompt_yes!(
-                    "{}",
-                    translate!("mv-prompt-overwrite", "target" => to.quote())
-                ) {
+                // We assign 'msg' the result of this block
+                let msg = {
+                    let default_msg = translate!("mv-prompt-overwrite", "target" => to.quote());
+
+                    #[cfg(unix)]
+                    {
+                        use libc::mode_t;
+                        use std::os::unix::fs::PermissionsExt;
+
+                        // We use an 'if let' as an expression here
+                        if let Ok(meta) = fs::metadata(to) {
+                            let mode = meta.permissions().mode() & 0o777;
+                            if (mode & 0o200) == 0 {
+                                let octal_mode = format!("{mode:04o}");
+                                let mode_string = format!("\u{200c}{octal_mode}");
+
+                                // This is the "return" value of the inner block
+                                translate!(
+                                    "mv-prompt-overriding-mode",
+                                    "target" => to.quote(),
+                                    "mode" => mode_string,
+                                    "mode_str" => uucore::fs::display_permissions_unix(mode as mode_t, false)
+                                )
+                            } else {
+                                default_msg
+                            }
+                        } else {
+                            default_msg
+                        }
+                    }
+
+                    #[cfg(not(unix))]
+                    {
+                        default_msg
+                    }
+                };
+
+                if !prompt_yes!("{}", msg) {
                     return Err(io::Error::other(""));
                 }
             }