systemd: Open path in terminal

Allow opening of a path from a URL option, path=path.
If the terminal is busy, then warn the user and prompt them to
continue.

pkg/systemd/terminal.jsx

@@ -7,6 +7,9 @@ import { createRoot } from "react-dom/client";
 import { FormSelect, FormSelectOption } from "@patternfly/react-core/dist/esm/components/FormSelect/index.js";
 import { NumberInput } from "@patternfly/react-core/dist/esm/components/NumberInput/index.js";
 import { Toolbar, ToolbarContent, ToolbarGroup, ToolbarItem } from "@patternfly/react-core/dist/esm/components/Toolbar/index.js";
+import { Alert, AlertActionCloseButton, AlertActionLink } from "@patternfly/react-core/dist/esm/components/Alert/index.js";
+import { fsinfo } from "cockpit/fsinfo";
+import { Button } from '@patternfly/react-core';
 
 import "./terminal.scss";
 
@@ -26,17 +29,20 @@ const _ = cockpit.gettext;
      * Spawns the user's shell in the user's home directory.
      */
     class UserTerminal extends React.Component {
-        createChannel(user) {
-            return cockpit.channel({
+        createChannel(user, dir) {
+            const ch = cockpit.channel({
                 payload: "stream",
                 spawn: [user.shell || "/bin/bash"],
                 environ: [
                     "TERM=xterm-256color",
                 ],
-                directory: user.home || "/",
+                directory: dir || user.home || "/",
                 pty: true,
                 binary: true,
             });
+            ch.addEventListener("ready", (_, msg) => this.setState({ pid: msg.pid }));
+            ch.addEventListener("close", () => this.setState({ pid: null }));
+            return ch;
         }
 
         constructor(props) {
@@ -66,12 +72,18 @@ const _ = cockpit.gettext;
                 title: 'Terminal',
                 theme: theme || "black-theme",
                 size: parseInt(size) || 16,
+                changePathBusy: false,
+                pathError: null,
+                pid: null,
             };
             this.onTitleChanged = this.onTitleChanged.bind(this);
             this.onResetClick = this.onResetClick.bind(this);
             this.onThemeChanged = this.onThemeChanged.bind(this);
             this.onPlus = this.onPlus.bind(this);
             this.onMinus = this.onMinus.bind(this);
+            this.forceChangeDirectory = this.forceChangeDirectory.bind(this);
+            this.onNavigate = this.onNavigate.bind(this);
+            this.dismiss = this.dismiss.bind(this);
 
             this.terminalRef = React.createRef();
             this.resetButtonRef = React.createRef();
@@ -81,8 +93,21 @@ const _ = cockpit.gettext;
         }
 
         async componentDidMount() {
+            cockpit.addEventListener("locationchanged", this.onNavigate);
+
+            let dir;
+            if (cockpit.location.options.path) {
+                const validPath = await this.readyPath();
+                if (validPath) {
+                    dir = cockpit.location.options.path;
+                }
+            }
             const user = await cockpit.user();
-            this.setState({ user, channel: this.createChannel(user) });
+            this.setState({ user, channel: this.createChannel(user, dir) });
+        }
+
+        componentWillUnmount() {
+            cockpit.removeEventListener("locationchanged", this.onNavigate);
         }
 
         onTitleChanged(title) {
@@ -95,6 +120,65 @@ const _ = cockpit.gettext;
             document.cookie = cookie;
         }
 
+        forceChangeDirectory() {
+            this.setState(prevState => ({
+                channel: this.createChannel(prevState.user, cockpit.location.options.path),
+                changePathBusy: false,
+            }));
+        }
+
+        dismiss() {
+            this.setState({
+                pathError: null,
+                changePathBusy: false,
+            });
+            cockpit.location.replace("");
+        }
+
+        async onNavigate() {
+            // Clear old path errors
+            this.setState({
+                pathError: null,
+                changePathBusy: false,
+            });
+
+            // If there's no path to change to, then we're done here
+            if (!cockpit.location.options.path) {
+                return;
+            }
+            const changeNow = await this.readyPath();
+            if (changeNow) {
+                this.setState(prevState => ({ channel: this.createChannel(prevState.user, cockpit.location.options.path) }));
+            }
+        }
+
+        async readyPath() {
+            // Check if path we're changing to exists
+            try {
+                const info = await fsinfo(String(cockpit.location.options.path), ['type']);
+                if (info.type !== "dir") {
+                    this.setState({ pathError: cockpit.format(_("$0 is not a directory"), cockpit.location.options.path) });
+                    return false;
+                }
+            } catch (err) {
+                this.setState({ pathError: cockpit.format(_("$0 does not exist"), cockpit.location.options.path) });
+                return false;
+            }
+
+            if (this.state.pid !== null) {
+                // Check if current shell has a process running in it, ie it's busy
+                const command = "grep -qr '^PPid:[[:space:]]*" + this.state.pid + "$' /proc/*/status";
+                try {
+                    await cockpit.script(command, [], { err: "message" });
+                    this.setState({ changePathBusy: true });
+                    return false;
+                } catch {
+                    return true;
+                }
+            }
+            return true;
+        }
+
         onPlus() {
             this.setState((state, _) => {
                 localStorage.setItem('terminal:font-size', state.size + 1);
@@ -186,6 +270,28 @@ const _ = cockpit.gettext;
                             </ToolbarContent>
                         </Toolbar>
                     </div>
+                    <div className="ct-terminal-dir-alert">
+                        {this.state.pathError && <Alert isInline variant="warning"
+                            title={_("Error opening directory")}
+                            actionClose={<AlertActionCloseButton onClose={this.dismiss} />}>
+                            <p>{_(this.state.pathError)}</p>
+                        </Alert>
+                        }
+
+                        {this.state.changePathBusy && <Alert title={_("Change directory?")}
+                            variant="danger"
+                            actionClose={<AlertActionCloseButton onClose={() =>
+                                this.setState({ changePathBusy: false })} />}
+                            actionLinks={
+                                <>
+                                    <Button variant="secondary" size="sm" onClick={this.forceChangeDirectory}>{_("Continue")}</Button>
+                                    <AlertActionLink onClick={this.dismiss}>{_("Cancel")}</AlertActionLink>
+                                </>
+                            }>
+                            {_("There is still a process running in this terminal. Changing the directory will kill it.")}
+                        </Alert>
+                        }
+                    </div>
                     <div className={"terminal-body " + this.state.theme} id="the-terminal">
                         {terminal}
                     </div>

pkg/systemd/terminal.scss

@@ -5,7 +5,7 @@
 .console-ct-container {
   block-size: 100%;
   display: grid;
-  grid-template-rows: auto 1fr;
+  grid-template-rows: auto auto 1fr;
   overflow: hidden;
 }