Sway. Загрузка

Загрузка сессии Sway.

1 Дисплей-менеджеры

2 Загрузка переменных среды перед сессией

• Для работоспособности Sway необходимо часть переменных загрузить перед сессией (см. Sway. Совместимость приложений).

2.1 Скрипт загрузки Sway

• Можно использовать наработки Fedora.
• Репозиторий: https://gitlab.com/fedora/sigs/sway/sway-config-fedora
• Для запуска используется скрипт /usr/bin/start-sway:

  #!/bin/sh
  
  ## Internal variables
  readonly _SWAY_COMMAND="/usr/bin/sway"
  SWAY_EXTRA_ARGS=""
  
  ## General exports
  export XDG_CURRENT_DESKTOP=sway
  export XDG_SESSION_DESKTOP=sway
  export XDG_SESSION_TYPE=wayland
  
  ## Hardware compatibility
  # We can't be sure that the virtual GPU is compatible with Sway.
  # We should be attempting to detect an EGL driver instead, but that appears
  # to be a bit more complicated.
  case $(systemd-detect-virt --vm) in
      "none"|"")
          ;;
      "kvm")
          # There's two drivers we can get here, depending on the 3D acceleration
          # flag state: either virtio_gpu/virgl or kms_swrast/llvmpipe.
          #
          # The former one causes graphical glitches in OpenGL apps when using
          # 'pixman' renderer. The latter will crash 'gles2' renderer outright.
          # Neither of those support 'vulkan'.
          #
          # The choice is obvious, at least until we learn to detect the driver
          # instead of abusing the virtualization technology identifier.
          #
          # See also: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/2871
          export WLR_RENDERER=pixman
          # 'pixman' on virtio_gpu with recent kernels is glitchy. Appears that
          # it only affects atomic KMS, and legacy interface works.
          export WLR_DRM_NO_ATOMIC=1
          # WLR_NO_HARDWARE_CURSORS=1 is not needed with legacy DRM interface
          ;;
      *)
          # https://github.com/swaywm/sway/issues/6581
          export WLR_NO_HARDWARE_CURSORS=1
          ;;
  esac
  
  ## Apply `environment.d(5)` customizations
  # This can be used to share the custom environment configs with systemd --user.
  # Importing `systemd --user show-environment` here may have unexpected
  # consequences, such as getting a leftover `WAYLAND_DISPLAY` or `DISPLAY`
  # and breaking Sway startup. Thus, the direct call to a systemd generator.
  set -o allexport
  eval "$(/usr/lib/systemd/user-environment-generators/30-systemd-environment-d-generator)"
  set +o allexport
  
  ## Load Sway-specific system environment customizations
  if [ -f /etc/sway/environment ]; then
      set -o allexport
      # shellcheck source=/dev/null
      . /etc/sway/environment
      set +o allexport
  fi
  
  ## Load Sway-specific user environment customizations
  if [ -f "${XDG_CONFIG_HOME:-$HOME/.config}/sway/environment" ]; then
      set -o allexport
      # shellcheck source=/dev/null
      . "${XDG_CONFIG_HOME:-$HOME/.config}/sway/environment"
      set +o allexport
  fi
  
  ## Unexport internal variables
  # export -n is not POSIX :(
  _SWAY_EXTRA_ARGS="$SWAY_EXTRA_ARGS"
  unset SWAY_EXTRA_ARGS
  
  ## Log all exported WLR_ variables
  if _WLR_VARS=$(env | grep '^WLR_'); then
      printf 'environment variables for wlroots: %s' "$_WLR_VARS" |
          tr '\n' ' ' |
          systemd-cat -p notice -t "${_SWAY_COMMAND##*/}"
  fi
  
  # Start sway with extra arguments and send output to the journal
  # shellcheck disable=SC2086 # quoted expansion of EXTRA_ARGS can produce empty field
  exec systemd-cat -- $_SWAY_COMMAND $_SWAY_EXTRA_ARGS "$@"
  

• Этот скрипт читает переменные для сессии Sway из файлов:
  • /etc/sway/environment;
  • ${XDG_CONFIG_HOME}/sway/environment (~/.config/sway/environment).
• Для запуска этого файла из стандартный дисплей-менеджеров нужно поправить файл /usr/share/wayland-sessions/sway.desktop:

  [Desktop Entry]
  Name=Sway
  Comment=An i3-compatible Wayland compositor
  Exec=start-sway
  Type=Application
  DesktopNames=sway
  

• Эти патчи добавлены в оверлей karma (см. Gentoo. Дополнительные репозитории).

2.2 Локальные переменные среды для Sway

• Файл с заданными локальными переменными находится в ~/.config/sway/environment:

  # -*- mode: shell -*-
  # vim: set ft=sh:
  # This file will be sourced from /usr/bin/start-sway script.
  # User-specific variables should be placed in $XDG_CONFIG_HOME/sway/environment
  
  ## Pass extra arguments to the /usr/bin/sway executable
  
  #SWAY_EXTRA_ARGS="$SWAY_EXTRA_ARGS --unsupported-gpu"
  #SWAY_EXTRA_ARGS="$SWAY_EXTRA_ARGS --debug"
  
  ## Set environment variables
  
  # Useful variables for wlroots:
  # https://gitlab.freedesktop.org/wlroots/wlroots/-/blob/master/docs/env_vars.md
  #
  #WLR_NO_HARDWARE_CURSORS=1
  

• Исправления для Java (см. Sway. Совместимость приложений):

  
  ## Java compatibility
  _JAVA_AWT_WM_NONREPARENTING=1
  

• Исправления для Qt (см. Sway. Совместимость приложений):

  
  ## Qt tuning
  # QT_QPA_PLATFORM=wayland
  QT_QPA_PLATFORM=xcb
  QT_QPA_PLATFORMTHEME=qt6ct
  QT_WAYLAND_DISABLE_WINDOWDECORATION=1
  QT_WAYLAND_FORCE_DPI=physical