contrib/pm-utils/40autorandr

   1 #!/bin/sh
   2 #
   3 # 40autorandr: Change autorandr profile on thaw/resume
   4 exec > /var/log/autorandr.log 2>&1
   5
   6 AUTORANDR="autorandr -c --default default"
   7
   8 # Work around #44: Long user names in w
   9 export PROCPS_USERLEN=32
  10
  11 find_user() {
  12         # Determine user owning the display session from $1
  13         D="$1"
  14
  15         # Prefer loginctl over all others, see bug #39
  16         if [ -x "`which loginctl`" ]; then
  17                 # Based on http://unix.stackexchange.com/questions/203844/how-to-find-out-the-current-active-xserver-display-number/204498
  18                 # by SO user intelfx
  19                 user="$(
  20                 loginctl list-sessions --no-legend | while read id uid user seat; do
  21                         session=$(loginctl show-session -p Display -p Active "$id")
  22                         first=$(echo $session | cut -d" " -f1)
  23                         second=$(echo $session | cut -d" " -f2)
  24
  25                         if [ -n $(echo "$first" | grep "Display") ]; then
  26                                 display=$first
  27                                 active=$second
  28                         else
  29                                 display=$second
  30                                 active=$first
  31                         fi
  32
  33                         active_value=$(echo "$active" | cut -d"=" -f2)
  34                         display_value=$(echo "$display" | cut -d"=" -f2)
  35
  36                         if [ "$active_value" != "yes" ]; then
  37                                 continue
  38                         fi
  39
  40                         if [ -n $display_value -a "$display_value" = "$D" ]; then
  41                                 echo $user
  42                         fi
  43                 done
  44                 )"
  45                 if [ -n "$user" ]; then
  46                         echo $user
  47                         return 0
  48                 fi
  49         fi
  50
  51         # Prefer w to who, see bug #39
  52         if [ -x "`which w`" ]; then
  53                 user="`w -h | awk -vD="$D" '$2 ~ ":"D"(.[0-9])?$" || $3 ~ ":"D"(.[0-9])?$" {print $1}' | head -n1`"
  54
  55                 if [ -z "$user" ];      then
  56                         # This fallback checks if there is exactly one user (except
  57                         # root) logged in an interactive session and assumes the
  58                         # session belongs to him. See bug #39.
  59                         user="`w -hu | awk '/^\w+/ && $1 !~ "root" { users[$1]=$1; } ENDFILE { if(asort(users) == 1) for(u in users) print users[u]; }'`"
  60                 fi
  61         else
  62                 user="`who --all | awk -vD="$D" '$3 ~ ":"D"(.[0-9])?$" {print $1}' | head -1`"
  63
  64                 if [ -z "$user" ];      then
  65                         # Same fallback as above; see bug #39.
  66                         user="`who -u | awk '/^\w+/ && $1 !~ "root" { users[$1]=$1; } ENDFILE { if(asort(users) == 1) for(u in users) print users[u]; }'`"
  67                 fi
  68         fi
  69
  70         if [ -n "$user" ]; then
  71                 echo $user
  72                 return 0
  73         fi
  74
  75         # If none of the above worked, check if there is only one user owning
  76         # processes in $DISPLAY except root
  77         #
  78         # This code should be optimized somehow, but keep in mind that not all
  79         # systems symlink sh -> bash!
  80         OUTPUT="$(
  81                 for p in /proc/*; do
  82                         [ -d $p ] || continue
  83                         d="$(awk -v RS='\0' -F= '$1=="DISPLAY" {print $2}' $p/environ 2>/dev/null)"
  84                         if [ "$d" = "$D" ]; then
  85                                 stat -c %U $p
  86                         fi
  87                 done | sort | uniq | grep -v root | nl | head -n1
  88         )"
  89         count=$(echo $OUTPUT | awk '{print $1}')
  90         user=$(echo $OUTPUT | awk '{print $2}')
  91
  92         if [ "$count" -eq 1 ]; then
  93                 echo $user
  94                 return 0
  95         fi
  96
  97         return 1
  98 }
  99
 100 detect_display()
 101 {
 102         for X in /tmp/.X11-unix/X*; do
 103                 D="${X##/tmp/.X11-unix/X}"
 104
 105                 user="$(find_user ":$D")"
 106
 107                 if [ x"$user" != x"" ]; then
 108                         logger "autorandr: Changing display configuration for display :$D, user '$user'"
 109                         export DISPLAY=":$D"
 110                         /bin/su -c "${AUTORANDR}" "$user"
 111                 fi
 112         done
 113 }
 114
 115 if grep -q systemd /proc/1/comm && [ "$2" = "udev" ]; then
 116     exec /bin/systemctl start autorandr-resume.service
 117 fi
 118
 119 case "$1" in
 120         thaw|resume)
 121                 detect_display
 122                 ;;
 123 esac