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