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                          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 $user
  31                                                 fi
  32                                                 ;;
  33                                 esac
  34                         done
  35                 done
  36                 )"
  37                 if [ -n "$user" ]; then
  38                         echo $user
  39                         return 0
  40                 fi
  41         fi
  42
  43         # Prefer w to who, see bug #39
  44         if [ -x "`which w`" ]; then
  45                 user="`w -h | awk -vD="$D" '$2 ~ ":"D"(.[0-9])?$" || $3 ~ ":"D"(.[0-9])?$" {print $1}' | head -n1`"
  46
  47                 if [ -z "$user" ];      then
  48                         # This fallback checks if there is exactly one user (except
  49                         # root) logged in an interactive session and assumes the
  50                         # session belongs to him. See bug #39.
  51                         user="`w -hu | awk '/^\w+/ && $1 !~ "root" { users[$1]=$1; } ENDFILE { if(asort(users) == 1) for(u in users) print users[u]; }'`"
  52                 fi
  53         else
  54                 user="`who --all | awk -vD="$D" '$3 ~ ":"D"(.[0-9])?$" {print $1}' | head -1`"
  55
  56                 if [ -z "$user" ];      then
  57                         # Same fallback as above; see bug #39.
  58                         user="`who -u | awk '/^\w+/ && $1 !~ "root" { users[$1]=$1; } ENDFILE { if(asort(users) == 1) for(u in users) print users[u]; }'`"
  59                 fi
  60         fi
  61
  62         if [ -n "$user" ]; then
  63                 echo $user
  64                 return 0
  65         fi
  66
  67         # If none of the above worked, check if there is only one user owning
  68         # processes in $DISPLAY except root
  69         #
  70         # This code should be optimized somehow, but keep in mind that not all
  71         # systems symlink sh -> bash!
  72         OUTPUT="$(
  73                 for p in /proc/*; do
  74                         [ -d $p ] || continue
  75                         d="$(awk -v RS='\0' -F= '$1=="DISPLAY" {print $2}' $p/environ 2>/dev/null)"
  76                         if [ "$d" = "$D" ]; then
  77                                 stat -c %U $p
  78                         fi
  79                 done | sort | uniq | grep -v root | nl | head -n1
  80         )"
  81         count=$(echo $OUTPUT | awk '{print $1}')
  82         user=$(echo $OUTPUT | awk '{print $2}')
  83
  84         if [ "$count" -eq 1 ]; then
  85                 echo $user
  86                 return 0
  87         fi
  88
  89         return 1
  90 }
  91
  92 detect_display()
  93 {
  94         for X in /tmp/.X11-unix/X*; do
  95                 D="${X##/tmp/.X11-unix/X}"
  96
  97                 user="$(find_user ":$D")"
  98
  99                 if [ x"$user" != x"" ]; then
 100                         logger "autorandr: Changing display configuration for display :$D, user '$user'"
 101                         export DISPLAY=":$D"
 102                         /bin/su -c "${AUTORANDR}" "$user"
 103                 fi
 104         done
 105 }
 106
 107 if grep -q systemd /proc/1/comm && [ "$2" = "udev" ]; then
 108     exec /bin/systemctl start autorandr-resume.service
 109 fi
 110
 111 case "$1" in
 112         thaw|resume)
 113                 detect_display
 114                 ;;
 115 esac