Check for the existence of a file or directory when pasting

For now we don't have conflict resolution implemented yet for copy and
paste so disallow pasting when any of the targets exist.

src/common.ts

@@ -51,3 +51,12 @@ export function * map_permissions<T>(func: (value: number, label: string) => T)
         yield func(value, label);
     }
 }
+
+export function basename(path: string) {
+    const elements = path.split('/');
+    if (elements.length === 0) {
+        return '/';
+    } else {
+        return elements[elements.length - 1];
+    }
+}

src/fileActions.jsx

@@ -40,7 +40,7 @@ import {
 } from "pam_user_parser.js";
 import { superuser } from "superuser";
 
-import { map_permissions, inode_types } from "./common";
+import { map_permissions, inode_types, basename } from "./common";
 import { useFilesContext } from "./app";
 
 const _ = cockpit.gettext;
@@ -467,11 +467,15 @@ const downloadFile = (currentPath, selected) => {
     window.open(`${prefix}?${query}`);
 };
 
-export const fileActions = (path, selected, setSelected, clipboard, setClipboard, addAlert, Dialogs) => {
+export const fileActions = (path, selected, setSelected, clipboard, setClipboard, cwdInfo, addAlert, Dialogs) => {
     const currentPath = path.join("/") + "/";
     const menuItems = [];
 
     const spawnPaste = (sourcePaths, targetPath) => {
+        if (sourcePaths.some(sourcePath => cwdInfo?.entries[basename(sourcePath)])) {
+            addAlert(_("Paste not overwriting existing files"), "danger", "paste-error");
+            return;
+        }
         cockpit.spawn([
             "cp",
             "-R",

src/files-card-body.jsx

@@ -80,9 +80,9 @@ const compare = (sortBy) => {
 
 const ContextMenuItems = ({ path, selected, setSelected, clipboard, setClipboard }) => {
     const Dialogs = useDialogs();
-    const { addAlert } = useFilesContext();
+    const { addAlert, cwdInfo } = useFilesContext();
     const menuItems = fileActions(path, selected, setSelected,
-                                  clipboard, setClipboard, addAlert, Dialogs);
+                                  clipboard, setClipboard, cwdInfo, addAlert, Dialogs);
 
     return (
         <MenuList>

src/sidebar.jsx

@@ -123,7 +123,7 @@ export const SidebarPanelDetails = ({
 
     const menuItems = fileActions(path, selected, setSelected,
                                   clipboard, setClipboard,
-                                  addAlert, Dialogs).map((option, i) => {
+                                  cwdInfo, addAlert, Dialogs).map((option, i) => {
         if (option.type === "divider")
             return <Divider key={i} />;
         return (

test/check-application

@@ -924,19 +924,31 @@ class TestFiles(testlib.MachineCase):
         b.wait_visible("[data-item='newfile']")
         self.assertEqual(m.execute("head -n 1 /home/admin/newdir/newfile"), "test_text\n")
         b.click(".breadcrumb-button:nth-of-type(4)")
+        self.browser.wait_not_present(".pf-c-empty-state")
 
         # Copy/paste directory
-        self.browser.wait_not_present(".pf-c-empty-state")
         m.execute("runuser -u admin mkdir /home/admin/copyDir")
+        b.click("[data-item='copyDir']")
+        b.click("#dropdown-menu")
+        b.click("#copy-item")
+        b.mouse("[data-item='newdir']", "dblclick")
+        b.click("#dropdown-menu")
+        b.click("#paste-item")
+        b.wait_visible("[data-item='copyDir']")
+        b.click(".breadcrumb-button:nth-of-type(4)")
+        self.browser.wait_not_present(".pf-c-empty-state")
+
+        # File already exists error
         b.click("[data-item='newfile']")
         b.click("#dropdown-menu")
         b.click("#copy-item")
         b.mouse("[data-item='newdir']", "dblclick")
         b.click("#dropdown-menu")
         b.click("#paste-item")
         b.wait_visible("[data-item='newfile']")
-        self.assertEqual(m.execute("head -n 1 /home/admin/newdir/newfile"), "test_text\n")
+        b.wait_in_text("h4.pf-v5-c-alert__title", "Paste not overwriting existing files")
         b.click(".breadcrumb-button:nth-of-type(4)")
+        self.browser.wait_not_present(".pf-c-empty-state")
 
     @testlib.skipBrowser(".upload_files() doesn't work on Firefox", "firefox")
     @testlib.skipImage("Debian-testing has Cockpit 311 without new upload support in fsreplace1", "debian-testing")