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     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 $keypressed
  81 }
  82
  83 failsafe_wait() {
  84     FAILSAFE=
  85     grep -q 'failsafe=' /proc/cmdline && FAILSAFE=true && export FAILSAFE
  86     if [ "$FAILSAFE" != "true" ]; then
  87       pi_failsafe_net_message=true
  88       preinit_net_echo "Please press button now to enter failsafe"
  89       pi_failsafe_net_message=false
  90       fs_wait_for_key f 'to enter failsafe mode' $fs_failsafe_wait_timeout && FAILSAFE=true
  91       [ -f "/tmp/failsafe_button" ] && FAILSAFE=true && echo "- failsafe button "`cat /tmp/failsafe_button`" was pressed -"
  92       [ "$FAILSAFE" = "true" ] && export FAILSAFE && touch /tmp/failsafe
  93     fi
  94 }
  95
  96 boot_hook_add preinit_main failsafe_wait
  97