#!/bin/bash -x
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export DISPLAY=${DISPLAY:-:0}
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function prepare_env() {
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# Try to figure out XAUTHORITY and DISPLAY
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for pid in $(pgrep X 2>/dev/null || \
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ls /proc|grep -ow "[0-9]*"|sort -rn); do
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PROC_DIR=/proc/$pid
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# Filter out non-X processes
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readlink $PROC_DIR/exe|grep -qwE "X$|Xorg$" || continue
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# Parse auth file and display from cmd args
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export XAUTHORITY=$(cat $PROC_DIR/cmdline|tr '\0' '\n'| \
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grep -w "\-auth" -A 1|tail -1)
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export DISPLAY=$(cat $PROC_DIR/cmdline|tr '\0' '\n'| \
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grep -w "^:.*" || echo ":0")
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logger -t $0 "Found auth: $XAUTHORITY for dpy: $DISPLAY"
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return
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done
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}
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function xrandr_wrapper() {
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xrandr --screen ${SCREEN:-0} $@
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}
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if ! xdpyinfo &>/dev/null; then
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# Try to setup env
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prepare_env
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if ! xdpyinfo &>/dev/null; then
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# Try to switch to an authorized user
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for XUSER in root $(users);do
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sudo -u $XUSER xdpyinfo &>/dev/null || continue
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logger -t $0 "Switch to user: $XUSER"
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sudo -u $XUSER $0; exit 0
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done
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logger -t $0 "Unable to contact Xserver!"
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exit 0
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fi
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fi
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TMP=$(mktemp)
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SCREENS=$(xdpyinfo|grep screens|cut -d':' -f2)
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for SCREEN in $(seq 0 ${SCREENS:-0}); do
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# Get monitors and current mode info
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xrandr_wrapper 2>&1|grep -oE "^.*connected|^.*\*"|tee $TMP
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# Result:
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# eDP-1 connected
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# 1536x2048 59.99*
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# DP-1 disconnected
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# HDMI-1 connected
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# 1920x1080 60.00*
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#
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# "*" means valid current mode.
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# Make sure every connected monitors been enabled with a valid mode.
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for MONITOR in $(grep -w connected $TMP|cut -d' ' -f1); do
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# Find monitors without a valid current mode
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if ! grep -w $MONITOR $TMP -A 1|grep "\*"; then
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# Ether disabled or wrongly configured
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xrandr_wrapper --output $MONITOR --auto
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logger -t $0 "Output $MONITOR enabled."
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fi
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done
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done
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rm -rf $TMP
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exit 0
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