nixpkgs/pkgs/tools/misc/xdummy/default.nix

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{ stdenv, writeText, writeScriptBin, xorg, xkeyboard_config }:
let
xorgConfig = writeText "dummy-xorg.conf" ''
Section "ServerLayout"
Identifier "dummy_layout"
Screen 0 "dummy_screen"
InputDevice "dummy_keyboard" "CoreKeyboard"
InputDevice "dummy_mouse" "CorePointer"
EndSection
Section "ServerFlags"
Option "DontVTSwitch" "true"
Option "AllowMouseOpenFail" "true"
Option "PciForceNone" "true"
Option "AutoEnableDevices" "false"
Option "AutoAddDevices" "false"
EndSection
Section "Files"
ModulePath "${xorg.xorgserver}/lib/xorg/modules"
ModulePath "${xorg.xf86videodummy}/lib/xorg/modules"
XkbDir "${xkeyboard_config}/share/X11/xkb"
FontPath "${xorg.fontadobe75dpi}/lib/X11/fonts/75dpi"
FontPath "${xorg.fontadobe100dpi}/lib/X11/fonts/100dpi"
FontPath "${xorg.fontbhlucidatypewriter75dpi}/lib/X11/fonts/75dpi"
FontPath "${xorg.fontbhlucidatypewriter100dpi}/lib/X11/fonts/100dpi"
FontPath "${xorg.fontbh100dpi}/lib/X11/fonts/100dpi"
FontPath "${xorg.fontmiscmisc}/lib/X11/fonts/misc"
FontPath "${xorg.fontcursormisc}/lib/X11/fonts/misc"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "freetype"
Load "glx"
EndSection
Section "InputDevice"
Identifier "dummy_mouse"
Driver "void"
EndSection
Section "InputDevice"
Identifier "dummy_keyboard"
Driver "void"
EndSection
Section "Monitor"
Identifier "dummy_monitor"
HorizSync 30.0 - 130.0
VertRefresh 50.0 - 250.0
Option "DPMS"
EndSection
Section "Device"
Identifier "dummy_device"
Driver "dummy"
VideoRam 192000
EndSection
Section "Screen"
Identifier "dummy_screen"
Device "dummy_device"
Monitor "dummy_monitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024"
EndSubSection
EndSection
'';
in writeScriptBin "xdummy" ''
#!${stdenv.shell}
export XKB_BINDIR="${xorg.xkbcomp}/bin"
exec ${xorg.xorgserver}/bin/Xorg \
-noreset \
-logfile /dev/null \
"$@" \
-config "${xorgConfig}"
''