add preinit modularization work by Daniel Dickinson (cshore)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19331 3c298f89-4303-0410-b956-a3cf2f4a3e73

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

@@ -0,0 +1,86 @@
+#!/bin/sh
+# Copyright (C) 2006-2010 OpenWrt.org
+# Copyright (C) 2010 Vertical Communications
+
+fs_wait_for_key () {
+    local timeout=$3
+    local timer
+    local do_failsafe
+    local keypress_true="$(mktemp)"
+    local keypress_wait="$(mktemp)"
+    local keypress_sec="$(mktemp)"
+    if [ -z "$keypress_wait" ]; then
+	keypress_wait=/tmp/.keypress_wait
+	touch $keypress_wait
+    fi
+    if [ -z "$keypress_true" ]; then
+	keypress_true=/tmp/.keypress_true
+	touch $keypress_true
+    fi
+    if [ -z "$keypress_sec" ]; then
+	keypress_sec=/tmp/.keypress_sec
+	touch $keypress_sec
+    fi
+
+    trap "echo 'true' >$keypress_true; lock -u $keypress_wait ; rm -f $keypress_wait" INT
+    trap "echo 'true' >$keypress_true; lock -u $keypress_wait ; rm -f $keypress_wait" USR1
+
+    [ -n "$timeout" ] || timeout=1
+    [ $timeout -ge 1 ] || timeout=1
+    timer=$timeout
+    lock $keypress_wait
+    {
+	while [ $timer -gt 0 ]; do
+            echo "$timer" >$keypress_sec
+	    timer=$(($timer - 1))
+	    sleep 1
+	done
+	lock -u $keypress_wait
+	rm -f $keypress_wait
+    } &
+
+    echo "Press $1<ENTER> $2"
+    # if we're on the console we wait for input
+    { 
+	while [ -r $keypress_wait ]; do
+	    timer="$(cat $keypress_sec)"
+
+	    [ -n "$timer" ] || timer=1
+	    timer="${timer%%\ *}"
+	    [ $timer -ge 1 ] || timer=1
+	    do_failsafe=""
+	    {
+		read -t "$timer" do_failsafe
+		if [ "$do_failsafe" = "$1" ]; then
+		    echo "true" >$keypress_true
+		    lock -u $keypress_wait
+		    rm -f $keypress_wait
+ 		fi
+	    }
+	done
+    }
+    lock -w $keypress_wait
+
+    trap - INT
+    trap - USR1
+
+    keypressed=1
+    [ "$(cat $keypress_true)" = "true" ] && keypressed=0
+    rm -f $keypress_true
+    rm -f $keypress_wait
+    rm -f $keypress_sec
+    
+    return $keypressed
+}
+
+failsafe_wait() {
+    FAILSAFE=
+    pi_failsafe_net_message=true
+    preinit_net_echo "Please press button now to enter failsafe"
+    pi_failsafe_net_message=false
+    echo -n "Press CTRL-C or "
+    fs_wait_for_key f 'to enter failsafe mode' $fs_failsafe_wait_timeout && FAILSAFE=true && export FAILSAFE
+}
+
+boot_hook_add preinit_main failsafe_wait
+