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355681ddab
- Make dashboard SIGTERM-aware - Handle panics on dashboard and terminate it gracefully, so it resets the terminal properly - Switch to TTY2 when it starts and back to TTY1 when it stops. Closes siderolabs/talos#7516. Signed-off-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>
69 lines
2.1 KiB
Go
69 lines
2.1 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// Package console contains console-related functionality.
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package console
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import (
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"fmt"
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"os"
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"syscall"
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"unsafe"
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"github.com/siderolabs/talos/pkg/machinery/constants"
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)
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const (
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// vtActivate activates the specified virtual terminal.
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// See VT_ACTIVATE:
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// https://man7.org/linux/man-pages/man2/ioctl_console.2.html
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// https://github.com/torvalds/linux/blob/v6.2/include/uapi/linux/vt.h#L42
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vtActivate uintptr = 0x5606
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// tioclSetKmsgRedirect redirects kernel messages to the specified tty.
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// See TIOCL_SETKMSGREDIRECT:
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// https://github.com/torvalds/linux/blob/v6.2/include/uapi/linux/tiocl.h#L33
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// https://github.com/torvalds/linux/blob/v6.2/drivers/tty/vt/vt.c#L3242
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tioclSetKmsgRedirect byte = 11
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)
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// Switch switches the active console to the specified tty.
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func Switch(ttyNumber int) error {
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// redirect the kernel logs to their own TTY instead of the currently used one,
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// so that other TTYs (e.g., dashboard on tty2) do not get flooded with kernel logs
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if err := redirectKernelLogs(constants.KernelLogsTTY); err != nil {
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return err
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}
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// we need a valid fd to any tty because ioctl requires it
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tty0, err := os.OpenFile("/dev/tty0", os.O_RDWR, 0)
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if err != nil {
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return err
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}
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defer tty0.Close() //nolint:errcheck
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if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, tty0.Fd(), vtActivate, uintptr(ttyNumber)); errno != 0 {
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return fmt.Errorf("failed to activate console: %w", errno)
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}
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return nil
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}
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// redirectKernelLogs redirects kernel logs to the specified tty.
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func redirectKernelLogs(ttyNumber int) error {
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tty, err := os.OpenFile(fmt.Sprintf("/dev/tty%d", ttyNumber), os.O_RDWR, 0)
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if err != nil {
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return err
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}
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args := [2]byte{tioclSetKmsgRedirect, byte(ttyNumber)}
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if _, _, errno := syscall.Syscall(syscall.SYS_IOCTL, tty.Fd(), syscall.TIOCLINUX, uintptr(unsafe.Pointer(&args))); errno != 0 {
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return fmt.Errorf("failed to set redirect for kmsg: %w", errno)
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}
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return tty.Close()
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}
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