How To Write To User Selected Directory On Host (Client) Machine?

[RomanoViolet]

Setup

I am building a tauri app with sveltekit as frontend and rust as backend.
The app is expected to steam ASCII-text data from a server and is expected to write it to a user specified location on the client machine.
This is different to the question on storing configuration data. My problem is to write results of a compute which are passed onto the client side from the server.

Problem

I run into the error Permission deined (os error 13)

What I Have Tried So Far

Verified File System Permissions

chmod 755 <intended write directory> , but the result did not change

Updated tauri.conf.json

Added:
"tauri": { "allowlist": { "fs": { "all": true, "writeFile": true, "createDir": true } },
"security": { "csp": "default-src blob: data: filesystem: ws: http: https: 'unsafe-eval' 'unsafe-inline'" },

Functions in rust are defined in main.rs as follows:

#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
use std::fs;
use std::path::Path;
use tauri::command;

#[command]
fn write_file(filepath: String, content: String) -> Result<(), String> {
    let path = Path::new(&filepath);
    if let Some(parent) = path.parent() {
        if let Err(e) = fs::create_dir_all(parent) {
            return Err(e.to_string());
        }
    }
    fs::write(path, content).map_err(|e| e.to_string())
}

fn main() {
    let _ = fix_path_env::fix(); // <---- Add this
    tauri::Builder::default()
        .invoke_handler(tauri::generate_handler![write_file])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}

Using Application Binary And Not Web App

I am using application binary, and not a web interface:

Information

[✔] Environment
- OS: Ubuntu 22.04 X64
✔ webkit2gtk-4.0: 2.44.2
✔ rsvg2: 2.52.5
✔ rustc: 1.78.0 (9b00956e5 2024-04-29)
✔ cargo: 1.78.0 (54d8815d0 2024-03-26)
✔ rustup: 1.27.1 (54dd3d00f 2024-04-24)
✔ Rust toolchain: stable-x86_64-unknown-linux-gnu (default)
- node: 20.14.0
- npm: 10.7.0

[-] Packages
- tauri [RUST]: 1.6.7
- tauri-build [RUST]: 1.5.2
- wry [RUST]: 0.24.10
- tao [RUST]: 0.16.9
- @tauri-apps/api [NPM]: 1.5.6
- @tauri-apps/cli [NPM]: 1.5.14

[-] App
- build-type: bundle
- CSP: default-src blob: data: filesystem: ws: http: https: 'unsafe-eval' 'unsafe-inline'
- distDir: ../build
- devPath: http://localhost:5173/
- framework: Svelte
- bundler: Webpack

Request

• Please help me achieve the goal of writing the text-stream to user chosen location, e.g., /home/user/Data/

It is important for my app to be able to write on host-machine at user-specified location as part of requirements. This is not a general web application, but is constrained to connect to a specified IP address "server" backend where compute is organized.

Many thanks!

[FabianLars]

the most common reason i've seen for os error 13 in tauri apps is that devs tried to write a file onto a folder path (basically the path was missing the file name). I think you'll also get e13 if the file already exists and is in use. Do you have a full example path you actually tried? Or maybe a bit of your js code?