xpub's Introduction

Xpub

"Xpub is a Shell script to get user's display environment variables of any X graphical session from anywhere."

Perks

No requirement: POSIX-compliant.
Omniscient: Provides X environment variables of any session from any user.
Usefull: Run graphical commands from udevrules (see below).
Extra: Display graphical command on a specific session.
Support: XWayland users, keep calm.

Installation

Package (AUR)

$ yaourt -S xpub

Manually

$ git clone https://github.com/Ventto/xpub.git
$ cd xpub
$ chmod +x src/xpub.sh

Usage

Usage: xpub [-t TTY]

Without option, prints the X session information of the current user.

  -h:   Prints this help and exits.
  -v:   Prints the version and exits.
  -t:   prints the current TTY's user X session information.

Examples

From terminal

sudo is required.

Get information of your current session:

$ xpub
TTY=tty2
XUSER=alice
XAUTHORITY=/home/alice/.Xauthority
DISPLAY=:0
DBUS_SESSION_BUS_ADDRESS=/path

Get information of a specific session:

$ xpub -t tty2
XUSER=alice
XAUTHORITY=/home/alice/.Xauthority
DISPLAY=:0
DBUS_SESSION_BUS_ADDRESS=/path

Udev rules

IMPORT{program}="/usr/bin/xpub", \
RUN+="/bin/su $env{XUSER} -c '/usr/bin/notify-send Hello'"

After editing your rules, you may need to run udevadm control --reload-rules.

For root

$ export $(xpub) ; su "${XUSER}" -c '/usr/bin/notify-send Hello'

Shell scripts

xenv=$(xpub 2>/tmp/xpub.log)

if [ $# -ne 0 ]; then
    exit 1
else
    export ${xenv}
fi

su "${XUSER}" -c "/usr/bin/notify-send Hello"

xpub's People

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xpub's Issues

Does not work on fresh Ubuntu 18.04

The output of who is, for example:
user :0 2018-08-22 10:54 (:0)
without a tty, thus the grep on line 69 does not produce anything.

Upon closer examination, a bunch of other things fail too, even if correct values are hardcoded here and there. I know too little about the whole display setup to be of much help on my own.

Does not work on ubuntu

Example output on ubuntu:

root     pts/1        2018-05-29 13:52 (57.136.143.112)

IP changed

So who | grep tty1 returns nothing

Changes for Ubuntu 20.04

Use login-ctl to get username, use w instead of who to get display variable directly.

--- batify/xpub/src/xpub.sh	2021-03-24 20:46:54.288945317 +0100
+++ /usr/local/bin/xpub	2021-03-24 21:22:25.474690184 +0100
@@ -66,7 +66,7 @@
 
     ${tFlag} && xtty="${tArg}" || xtty="$(cat /sys/class/tty/tty0/active)"
 
-    xuser="$(who | grep "${xtty}" | head -n 1 | cut -d' ' -f1)"
+    xuser="$(loginctl list-sessions | grep "${xtty}" | awk '{print $3}' )"
 
     [ -z "${xuser}" ] && { echo "No user found from ${xtty}." 1>&2; exit 1; }
 
@@ -75,7 +75,7 @@
 
     if [ -n "${xpids}" ]; then
         for xpid in ${xpids}; do
-            xdisplay="$(ps -o cmd= "${xpid}" | grep "${vterm}" | grep -E -o ':[0-9]')"
+            xdisplay="$(w | grep "${xuser}" | grep -E -o ':[0-9]' | sort -u)"
             if [ "$?" -eq 0 ]; then
                 xdisplay="$(echo "${xdisplay}" | head -n1)"
                 break

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