xsession-daemon

   1 #!/bin/sh
   2 # Stolen from and based on Robert Cutajar
   3 # https://askubuntu.com/a/421718
   4
   5 if [ "$#" == "0" ] ;
   6 then
   7     echo "Session daemon missing command" >&2
   8     echo "USAGE: $0 command [args...]"
   9     echo "Executes given command with args only once per XDG seat (session)."
  10     echo "Keeps PID and log of the executed command."
  11     exit 1
  12 fi
  13
  14 COMMAND=$1
  15 shift
  16
  17 NAME="${COMMAND##*/}"
  18 PIDFILE=~/.cache/xsession-daemon/$NAME-$XDG_SEAT.pid
  19 LOGFILE=~/.cache/xsession-daemon/$NAME-$XDG_SEAT.log
  20 PID=""
  21 PIDDIR="${PIDFILE%/*}"
  22 LOGDIR="${LOGFILE%/*}"
  23
  24 mkdir -p $PIDDIR
  25 if [ $? -ne 0 ];
  26 then
  27     echo "Session daemon PIDDIR not there: $PIDDIR" >&2
  28     exit 2
  29 fi
  30
  31 mkdir -p $LOGDIR
  32 if [ $? -ne 0 ];
  33 then
  34     echo "Session daemon LOGDIR not there: $LOGDIR" >&2
  35     exit 2
  36 fi
  37
  38 if [ -e "$PIDFILE" ] ;
  39 then
  40     echo "Session daemon '$NAME' PIDFILE found: $PIDFILE"
  41     PID=`cat "$PIDFILE"`
  42     echo "Session daemon '$NAME' PID found: $PID"
  43 else
  44     echo "Session daemon '$NAME' PIDFILE NOT found: $PIDFILE"
  45 fi
  46
  47 if [ "$PID" ] && kill -0 "$PID" 2>/dev/null ;
  48 then
  49     echo "Session daemon '$NAME' was already running with PID $PID" >&2
  50     exit 3
  51 fi
  52
  53 echo "Session daemon running $COMMAND $* > $LOGFILE 2>&1"
  54 $COMMAND $* > "$LOGFILE" 2>&1 &
  55 PID=$!
  56 ERR=$?
  57 sleep 1
  58
  59 if [ "$PID" ] && [  $ERR == 0 ] && kill -0 "$PID" 2>/dev/null;
  60 then
  61     echo -n $PID > "$PIDFILE"
  62     echo "Session daemon '$NAME' started with PID $PID"
  63 else
  64     echo "Session daemon '$NAME' did not start or finished early. PID: $PID, ERR: $ERR" >&2
  65     cat "$LOGFILE" >&2
  66     exit 4
  67 fi