package/base-files/files/lib/preinit/30_failsafe_wait

   1 #!/bin/sh
   2 # Copyright (C) 2006-2010 OpenWrt.org
   3 # Copyright (C) 2010 Vertical Communications
   4
   5 fs_wait_for_key () {
   6         local timeout=$3
   7         local timer
   8         local do_keypress
   9         local keypress_true="$(mktemp)"
  10         local keypress_wait="$(mktemp)"
  11         local keypress_sec="$(mktemp)"
  12         if [ -z "$keypress_wait" ]; then
  13                 keypress_wait=/tmp/.keypress_wait
  14                 touch $keypress_wait
  15         fi
  16         if [ -z "$keypress_true" ]; then
  17                 keypress_true=/tmp/.keypress_true
  18                 touch $keypress_true
  19         fi
  20         if [ -z "$keypress_sec" ]; then
  21                 keypress_sec=/tmp/.keypress_sec
  22                 touch $keypress_sec
  23         fi
  24
  25         trap "echo 'true' >$keypress_true; lock -u $keypress_wait ; rm -f $keypress_wait" INT
  26         trap "echo 'true' >$keypress_true; lock -u $keypress_wait ; rm -f $keypress_wait" USR1
  27
  28         [ -n "$timeout" ] || timeout=1
  29         [ $timeout -ge 1 ] || timeout=1
  30         timer=$timeout
  31         lock $keypress_wait
  32         {
  33                 while [ $timer -gt 0 ]; do
  34                         echo "$timer" >$keypress_sec
  35                         timer=$(($timer - 1))
  36                         sleep 1
  37                 done
  38                 lock -u $keypress_wait
  39                 rm -f $keypress_wait
  40         } &
  41
  42         [ "$pi_preinit_no_failsafe" != "y" ] && echo "Press the [$1] key and hit [enter] $2"
  43         echo "Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level"
  44         # if we're on the console we wait for input
  45         {
  46                 while [ -r $keypress_wait ]; do
  47                         timer="$(cat $keypress_sec)"
  48
  49                         [ -n "$timer" ] || timer=1
  50                         timer="${timer%%\ *}"
  51                         [ $timer -ge 1 ] || timer=1
  52                         do_keypress=""
  53                         {
  54                                 read -t "$timer" do_keypress
  55                                 case "$do_keypress" in
  56                                 $1)
  57                                         echo "true" >$keypress_true
  58                                         ;;
  59                                 1 | 2 | 3 | 4)
  60                                         echo "$do_keypress" >/tmp/debug_level
  61                                         ;;
  62                                 *)
  63                                         continue;
  64                                         ;;
  65                                 esac
  66                                 lock -u $keypress_wait
  67                                 rm -f $keypress_wait
  68                         }
  69                 done
  70         }
  71         lock -w $keypress_wait
  72
  73         keypressed=1
  74         [ "$(cat $keypress_true)" = "true" ] && keypressed=0
  75
  76         rm -f $keypress_true
  77         rm -f $keypress_wait
  78         rm -f $keypress_sec
  79
  80         return $keypressed
  81 }
  82
  83 failsafe_wait() {
  84         FAILSAFE=
  85         [ "$pi_preinit_no_failsafe" = "y" ] && {
  86                 fs_wait_for_key "" "" $fs_failsafe_wait_timeout
  87                 return
  88         }
  89         grep -q 'failsafe=' /proc/cmdline && FAILSAFE=true && export FAILSAFE
  90         if [ "$FAILSAFE" != "true" ]; then
  91                 pi_failsafe_net_message=true
  92                 preinit_net_echo "Please press button now to enter failsafe"
  93                 pi_failsafe_net_message=false
  94                 fs_wait_for_key f 'to enter failsafe mode' $fs_failsafe_wait_timeout && FAILSAFE=true
  95                 [ -f "/tmp/failsafe_button" ] && FAILSAFE=true && echo "- failsafe button "`cat /tmp/failsafe_button`" was pressed -"
  96                 [ "$FAILSAFE" = "true" ] && export FAILSAFE && touch /tmp/failsafe
  97         fi
  98 }
  99
 100 boot_hook_add preinit_main failsafe_wait