Sway: Difference between revisions

Revision as of 06:08, 28 February 2023

Sway is a tiling Wayland compositor. It's a drop-in replacement for the i3 window manager.

Setup

Don't forget, you will need to add the community repository.

$ whoami
user
$ su 
<snippet>
# whoami
root
# echo $USER # just so that we know we retained the same environment variables
user
# # if the output is 'root' then we know we must have logged in using 'su -'
# cat /etc/apk/repositories
<snippet>
# # You can edit the files in vi and remove the comment '#' from the line that has <version>/community

Once you have updated the file manually you can continue to the installation step.

Tip: Or you can run something ridiculous like this:

# tFILE='/etc/apk/repositories'
# line="$(cat $tFILE | grep -E "^#.*alpine/v.*/community" | cut -f1 -d:)" # add the comments so that it doesn't run everytime
# awk -v line=$line 'FNR == line { sub("#",""); print } FNR != line { print }' $tFILE > $tFILE.upd
# cat $tFILE.upd # if everything is correct after inspection then we can move it over
<snippet>
# cp $tFILE $tFILE.bak # just in case the hairbrained idea doesn't work
# cat $tFILE.upd > $tFILE; rm $tFILE.upd # we want to keep the file permissions so don't use cp

Installation

eudev:

# whoami
root
# rc-update # let's look at the services that are configured for each run-level
<snippet>
# apk add eudev
# setup-devd udev
# rc-update # we can now see the services that have been added by the setup script
<snippet>

Graphics drivers:

Add user to the input and video groups:

# whoami
root
# echo $USER
user
# adduser $USER input
# adduser $USER video

Install some TTF fonts:

# apk add ttf-dejavu
<snippet>

seatd daemon:

# # if we like we can look at the services again using rc-update
# apk add seatd
<snippet>
# rc-update add seatd
# # and then look again to compare
# rc-service seatd start
# adduser $tempUSER seat

Install sway:

# apk add sway sway-doc
<snippet>
# apk add                \ # Install optional dependencies:
    xwayland             \ # recommended for compatibility reasons
    foot                 \ # default terminal emulator. Modify $term in config for a different one.
    bemenu               \ # wayland menu
    swaylock swaylockd   \ # lockscreen tool
    swaybg               \ # wallpaper daemon
    swayidle               # idle management (DPMS) daemon

Configure XDG_RUNTIME_DIR.

Usage

For inter-program communication and functionality such as screensharing, install and enable dbus and PipeWire, see PipeWire and set SWAYSOCK environmental variable to the value exported by sway. In order to ensure that Pipewire and related services inherit the right environment variables, it is recommended to start these services via a process that is a direct descendant of sway itself.

Launch Sway with a D-Bus server available, use:

dbus-run-session -- sway #prepend with exec in your login shell init script

Configuration

An example config is provided at /etc/sway/config. Copy it to ~/.config/sway/config and read through it to learn the default keybindings. Sway configuration is mostly backwards-compatible with that of i3 and if you are looking for a solution for a specific issue, you may also try checking if it hasn't been provided for i3WM.

For additional information, start at man 5 sway and read the upstream wiki.

Firefox screensharing

For some programs, additional configuration is needed to launch them natively under Wayland and to support special features such as screen sharing.

To launch Firefox natively under Wayland and to enable support for screensharing, you need:

Install and configure PipeWire
Install xdg-desktop-portal and xdg-desktop-portal-wlr package
Install wofi for screen selection
Launch support programs on sway startup:

exec /usr/libexec/pipewire-launcher #pipewire must be launched first
exec /usr/libexec/xdg-desktop-portal-wlr

Export the following variables:

export MOZ_ENABLE_WAYLAND="1"
export XDG_CURRENT_DESKTOP=sway
export QT_QPA_PLATFORM="wayland-egl"

Flatpaks

Due to their sandboxing, flatpaks require the use of a portal frontend (xdg-desktop-portal) and backends (such as xdg-desktop-portal-wlr, xdg-desktop-gtk, xdg-desktop-portal-gnome) that implement the methods. When in doubt, install multiple backends. For more information on backends, see flatpak's page on the subject. In addition to the steps under the "Firefox Screensharing" section, it may also be necessary to launch additional backends in your Sway config file. Otherwise, you may run into GDBus errors as your flatpak fails to interface with the portal. This can cause issues such as with opening your file directories from a flatpak application.

After installing different backends, you might need to add the relevant backends to your sway config file similarly to in the "Firefox Screensharing" section above. For example, an autostart section of your sway config file may include:

exec /usr/libexec/xdg-desktop-portal-gtk
exec /usr/libexec/xdg-desktop-portal-wlr
exec /usr/libexec/xdg-desktop-portal-gnome

This is only needed if they are not started automatically via other means.

Scaling for high resolution screens

Without further configuration, program interfaces might be too small to use on high resolution screens.

Via sway

Sway supports the per-display configuration of

fractional (e.g., 1.5x), and
integer scaling (e.g., 2x)

However, fractional scaling is discouraged due to both the performance impact and the blurry output it produces. In this case, where 1x scaling is too small and 2x scaling is too large, program-specific GTK/QT based scaling is recommended. See below.

To enable Sway scaling, the user can first preview different scaling factors with wdisplays package. Note the output name (eDP-1, LVDS-1) and try apply scaling factors such as 1 and 2. To make changes permanent, add

output <name> scale <factor> to ~/.config/sway/config

Via GTK/Qt

# for GTK-based programs such as firefox and emacs:
export GDK_DPI_SCALE=2

# for QT-based programs
export QT_WAYLAND_FORCE_DPI="physical"
# or if still too small, use a custom DPI
export QT_WAYLAND_FORCE_DPI=192 # 2x scaling
export QT_QPA_PLATFORM="wayland-egl"

Make clipboard content persistent

By default the clipboard content does not persist after terminating the program: you copy some text from Firefox and then exit Firefox, the copied text is also lost.

Install clipman from test repo and add the following to sway config:

exec wl-paste --type text/plain --watch clipman store --histpath="~/.local/state/clipman-primary.json"
bindsym $mod+h exec clipman pick --tool wofi --histpath="~/.local/state/clipman-primary.json"

Firefox picture-in-picture mode/floating windows

Add this to your sway config file (modify the numeric values to suit your needs and your display):

for_window [app_id="firefox" title="^Picture-in-Picture$"] floating enable, move position 877 450, sticky enable, border none

Screenshots

A simple tool that works well under Wayland is Grimshot. Example keybindings:

bindsym Print exec grimshot copy area
bindsym Shift+Print exec grimshot copy screen
bindsym Control+Print exec grimshot save area ~/Pictures/$(date +%d-%m-%Y-%H-%M-%S).png
bindsym Control+Shift+Print exec grimshot save screen ~/Pictures/$(date +%d-%m-%Y-%H-%M-%S).png

See the sway wiki's article for a list of screenshot tools.

Start with NumLock enabled

Add this to your sway config file: input type:keyboard xkb_numlock enabled

Change cursor theme and size

Add to your sway config:

seat seat0 xcursor_theme my_cursor_theme my_cursor_size

You can inspect their values with echo $XCURSOR_SIZE and echo $XCURSOR_THEME. If reloading your config does not result in change, try logging out and in.

Note: Wayland uses client-side cursors. It is possible that applications do not evaluate the values of $XCURSOR_SIZE and $XCURSOR_THEME.

Start as a service

Although this is not necessary, you may write an init script like the following:

{{/etc/init.d/sway|
#!/sbin/openrc-run

description="Sway Compositor"

command="/usr/bin/sway"
command_args=""

pidfile="/run/sway.pid"

start_stop_daemon_args="--background --pidfile ${pidfile}"

depend() {
  need localmount
  after elogind
  use seatd dbus
}

Then as a root run chmod +x /etc/init.d/seat and rc-update add sway default. Make sure you have elogind installed or specify another service, like your display/login manager after which the sway service will run.

Custom keyboard layout

Since wayland does not support setxkbmap, you will also need to add similar content to your /usr/share/X11/xkb/rules/evdev.xml, after </modelList> and after <layoutList>:

<layout>
      <configItem>
        <name>[the name of your layout, same as the name of the file in /usr/share/X11/xkb/symbols]</name>
        <shortDescription>[usually just two letters]</shortDescription>
        <description>[description of your layout]</description>
        <countryList>
          <iso3166Id>US</iso3166Id>
          <iso3166Id>NO</iso3166Id>
        </countryList>
        <languageList>
          <iso639Id>eng</iso639Id>
        </languageList>
      </configItem>
    </layout>
<!--[other layouts]-->

Then, to enable for all keyboards, navigate to the input section of ~/.config/sway/config and modify it to

input * {
  xkb_layout "my_layout" 
}

If you have enabled xkb_numlock, include this setting inside those braces as well.

Troubleshooting

If you encounter any issues, try running sway -Vc /etc/sway/config. It will run sway with the default config file and set the output to be more verbose. It is generally a good idea to track your config files with git (when and if at all you use a remote repository for them, keep it private for security reasons).

Firefox (Flatpak) and/or GTK apps

Disappearing cursor

You may need to get an icon pack and possibly a theme from Pling store and set GTK_THEME environmental variable. Alternatively you can install a theme for all users (search Alpine Linux Packages for *-icon-theme) using apk add.

Missing file picker/cannot download

Go to about:config and set widget.use-xdg-desktop-portal.file-picker to 0.

Failing to start under certain graphics cards/multiple wlroots stacked windows spawning upon start

As of Dec 31 2022, Nvidia still doesn't fully support Wayland. Therefore, the possible solutions are as outlined in the link, or setting your WLR_BACKENDS environmental variables to drm,libinput or x11 (add libinput here as well if you cannot use your mouse and keyboard after starting Sway). The latter also works for AMD/ATI cards (make sure to install libinput first).

Sway socket not detected

See Installation for instructions on how to set this environmental variable. This issue may occur with terminal multiplexers, such as tmux

Sway freezes after loading and no iput works

You can move to a new tty [CTRL + ALT + F<n>; where <n> is a number Fkey on your keyboard], login as root, and kill all the processes that are linked to the problem tty.

Tip: Something like this

# for i in $(ps | awk '{ if($2==<user>) { print $1 } }'); do
> kill -9 $i
> done # don't forget to replace <user> with the user of the frozen tty

Steam games launched via Proton crash before creating a window

Instead of just using the in-Steam menu to install and select a Proton version, try installing the flatpak community build for Proton onto your system. There are several versions, depending on your desired stability, and the experimental version available in Flathub is called "com.valvesoftware.Steam.CompatibilityTool.Proton-Exp". After you install your chosen version, go into Steam to specify compatibility tool for a game as usual. The installed community build will now be an option. Select that and try launching the game again.

Novice Questions

What if the services `hwdrivers` or `mdev` are not in the `sysinit` run-level?

"udev performs its own hwdrivers module detection, it does not need the additional service. We delete the hwdrivers service when enabling udev, and add it when enabling mdev and mdevd."

Source: alpine-conf

What does `seatd` do?

"Seat management takes care of mediating access to shared devices (graphics, input), without requiring the applications needing access to be root."

Source: sourcehut

What if I run into a problem with sway?

You can always check the version that you are running. But problems like the following error can occur:

# sway --version
Error loading shared library libjson-c.so.5: I/O error (needed by /usr/bin/sway)
<snippet>

When this error occurred I was experiencing trouble with the filesystem. The filesystem had *booped* itself into read-only mode. A reboot fixed this error.

# sway --version
sway version 1.7

Where is good Alpine documentation?

Try here for reading. gitlab.alpinelinux.org/alpine/aports/-/issues

How do I debug the launch of Sway?

I ran sway -Vc /home/<user>/.config/sway/config as root so that I would experience an error and not complete.

What happens if `SWAYSOCK` is empty?

https://github.com/swaywm/swaylock/blob/master/README.md

What happens if `LD_LIBRARY_PATH` is empty?

"LD_PRELOAD (not LD_PRELOAD_PATH) is a list of specific libraries (files) to be loaded before any other libraries, whether the program wants it or not. LD_LIBRARY_PATH is a list of directories to search when loading libraries that would have been loaded anyway. On linux you can read man ld.so for more information about these and other environment variables that affect the dynamic linker."

Source

[1]

"When should I set LD_LIBRARY_PATH? The short answer is never.
Why? Some users seem to set this environment variable because of bad advice from other users or badly linked code that they do not know how to fix."

Source

[2]

Source: [3]

Note: ENVIRONMENT

The following environment variables have an effect on sway:

SWAYSOCK

Specifies the path to the sway IPC socket. XKB_DEFAULT_RULES, XKB_DEFAULT_MODEL, XKB_DEFAULT_LAYOUT, XKB_DEFAULT_VARIANT, XKB_DEFAULT_OPTIONS

Configures the xkb keyboard settings. See xkeyboard-config(7). The preferred way to configure the keyboard is via the configuration file, see sway-input(5). The following environment variables are set by sway:

DISPLAY

If compiled with Xwayland support and Xwayland is not disabled by the config, this will be set to the name of the X display used for Xwayland. I3SOCK

For compatibility with i3, specifies the path to the sway IPC socket.