After commit c018f5fd29 Fenrir is being switched over to go. If you do not want to be part of the testing process, please switch to master.

internal/app/scripts.go

@@ -0,0 +1,117 @@
+// Fenrir console screen reader.
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+// This program 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.
+//
+// This program 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
+// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.
+
+package app
+
+import (
+	"fmt"
+	"log/slog"
+	"os"
+	"os/user"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"git.stormux.org/storm/fenrir/internal/i18n"
+	"git.stormux.org/storm/fenrir/internal/presentation"
+	"git.stormux.org/storm/fenrir/internal/scripts"
+)
+
+// script_username supplies Python's current-user argument without changing
+// process credentials, HOME, cwd or any inherited environment variable.
+// Session lookup runs in a script worker, never in the input dispatcher.
+func script_username(terminalMode bool, terminal int) string {
+	if terminalMode {
+		for _, name := range []string{os.Getenv("LOGNAME"), os.Getenv("USER")} {
+			if name != "" {
+				return name
+			}
+		}
+		if current, err := user.Current(); err == nil {
+			return current.Username
+		}
+		return ""
+	}
+	// Read logind/elogind's local session metadata, matching Python's active-VT
+	// lookup without adding a synchronous D-Bus round trip to keyboard handling.
+	for _, directory := range []string{"/run/systemd/sessions", "/run/elogind/sessions"} {
+		entries, _ := os.ReadDir(directory)
+		for _, entry := range entries {
+			data, err := os.ReadFile(filepath.Join(directory, entry.Name()))
+			if err != nil {
+				continue
+			}
+			values := map[string]string{}
+			for _, line := range strings.Split(string(data), "\n") {
+				if key, value, ok := strings.Cut(line, "="); ok {
+					values[key] = value
+				}
+			}
+			if values["VTNR"] != strconv.Itoa(terminal) && values["TTY"] != fmt.Sprintf("tty%d", terminal) {
+				continue
+			}
+			if current, err := user.LookupId(values["UID"]); err == nil {
+				return current.Username
+			}
+		}
+	}
+	return "" // Python also leaves this empty when no session was found.
+}
+
+func remote_authorized(uid, terminal int, terminalMode bool) bool {
+	if uid == 0 || uid == os.Geteuid() {
+		return true
+	}
+	if terminalMode || os.Geteuid() != 0 || terminal < 1 {
+		return false
+	}
+	info, err := os.Stat(fmt.Sprintf("/dev/tty%d", terminal))
+	if err != nil {
+		return false
+	}
+	stat, ok := info.Sys().(*syscall.Stat_t)
+	return ok && int(stat.Uid) == uid
+}
+
+func (a *application) script_result(result scripts.Result) {
+	if result.Generation != a.scriptGeneration || result.Terminal != a.lastTerminal || !a.lastActive {
+		return
+	}
+	if result.Err != nil {
+		slog.Warn("script invocation failed", "error", result.Err, "at", time.Now())
+		text := "Script failed"
+		switch result.Err.Error() {
+		case "Script file not found", "Script source is not a valid file", "Script file is not executable":
+			text = result.Err.Error()
+		}
+		a.present(i18n.T(text), presentation.Error)
+		return
+	}
+	if result.Truncated {
+		slog.Warn("script output truncated", "at", time.Now())
+	}
+	// Match Python's stderr-before-stdout result delivery. Speech still
+	// follows this reader's shared queue and mute policy.
+	if result.Stderr != "" {
+		a.present(result.Stderr, "")
+	}
+	if result.Stdout != "" {
+		a.present(result.Stdout, "")
+	}
+}