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wlseeds/docs/env_vars.md

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wlroots reads these environment variables

wlroots specific

  • WLR_DRM_DEVICES: specifies the DRM devices (as a colon separated list) instead of auto probing them. The first existing device in this list is considered the primary DRM device.
  • WLR_DRM_NO_ATOMIC: set to 1 to use legacy DRM interface instead of atomic mode setting
  • WLR_LIBINPUT_NO_DEVICES: set to 1 to not fail without any input devices
  • WLR_BACKENDS: comma-separated list of backends to use (available backends: wayland, x11, headless, noop)
  • WLR_NO_HARDWARE_CURSORS: set to 1 to use software cursors instead of hardware cursors
  • WLR_SESSION: specifies the wlr_session to be used (available sessions: logind/systemd, direct)
  • WLR_DIRECT_TTY: specifies the tty to be used (instead of using /dev/tty)

Headless backend

  • WLR_HEADLESS_OUTPUTS: when using the headless backend specifies the number of outputs

RDP backend

  • WLR_RDP_TLS_CERT_PATH: required when using wlr_backend_autocreate, specifies the path to the TLS certificate to use for encrypting connections
  • WLR_RDP_TLS_KEY_PATH: required when using wlr_backend_autocreate, specifies the path to the TLS private key to use for encrypting connections
  • WLR_RDP_ADDRESS: the IP address to bind to, defaults to 127.0.0.1
  • WLR_RDP_PORT: the port to bind to, defaults to 3389.

Note: a TLS certificate and key can be generated like so:

$ openssl genrsa -out tls.key 2048
$ openssl req -new -key tls.key -out tls.csr
$ openssl x509 -req -days 365 -signkey tls.key -in tls.csr -out tls.crt

tls.csr can be discarded. Connecting to the RDP backend with xfreedrp can be done like so:

xfreerdp -v localhost --bpp 32 --size 1920x1080 --rfx

Wayland backend

  • WLR_WL_OUTPUTS: when using the wayland backend specifies the number of outputs

X11 backend

  • WLR_X11_OUTPUTS: when using the X11 backend specifies the number of outputs

Rootston specific

  • XKB_DEFAULT_RULES, XKB_DEFAULT_MODEL, XKB_DEFAULT_LAYOUT, XKB_DEFAULT_VARIANT, XKB_DEFAULT_OPTIONS: xkb setup

Generic

  • DISPLAY: if set probe X11 backend in wlr_backend_autocreate
  • WAYLAND_DISPLAY, _WAYLAND_DISPLAY, WAYLAND_SOCKET: if set probe Wayland backend in wlr_backend_autocreate
  • XCURSOR_PATH: directory where xcursors are located