don't upload file if it already exists

navigator/navigator.css

@@ -521,7 +521,6 @@ input:checked + .slider:before {
 .nav-notification-header {
 	position: relative;
 	z-index: 10;
-	font-size: 120%;
 	font-weight: bold;
 }
 

navigator/navigator.js

@@ -854,6 +854,14 @@ class FileUpload {
 		this.chunk_index = 0;
 	}
 
+	check_if_exists() {
+		return new Promise((resolve, reject) => {
+			var proc = cockpit.spawn(["/usr/share/cockpit/navigator/scripts/fail-if-exists.py", this.path], {superuser: "try"});
+			proc.done((data) => {resolve(false)});
+			proc.fail((e, data) => {resolve(true)});
+		});
+	}
+
 	make_html_element() {
 		var notification = document.createElement("div");
 		notification.classList.add("nav-notification");
@@ -892,14 +900,20 @@ class FileUpload {
 		return chunks;
 	}
 
-	upload() {
+	async upload() {
+		if (await this.check_if_exists()) {
+			window.alert(this.filename + ": File exists.");
+			return;
+		}
 		this.make_html_element();
 		this.proc = cockpit.spawn(["/usr/share/cockpit/navigator/scripts/write-chunks.py", this.path], {err: "out", superuser: "try"});
 		this.proc.fail((e, data) => {
+			this.reader.onload = () => {}
+			this.done();
 			window.alert(data);
 		})
 		this.proc.done((data) => {
-			this.nav_window_ref.stop_load();
+			
 		})
 		this.reader.onload = (function(uploader_ref) {
 			return async function(evt) {

navigator/scripts/fail-if-exists.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+
+"""
+    Cockpit Navigator - A File System Browser for Cockpit.
+    Copyright (C) 2021 Josh Boudreau <jboudreau@45drives.com>
+
+    This file is part of Cockpit Navigator.
+    Cockpit Navigator is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+    Cockpit Navigator is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+    You should have received a copy of the GNU General Public License
+    along with Cockpit Navigator.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+import os
+import sys
+
+if os.path.exists(sys.argv[1]):
+    sys.exit(1)
+
+sys.exit(0)

navigator/scripts/write-chunks.py

@@ -34,7 +34,7 @@ def main():
         sys.exit(1)
     path = sys.argv[1]
     try:
-        file = open(path, "a+b")
+        file = open(path, "xb")
     except Exception as e:
         print(e)
         sys.exit(1)