dropboxd

#!/bin/bash

# Copyright 2008 Evenflow, Inc., 2010 Dropbox
#
# Environment script for the dropbox executable.

WAIT_TIME=5 #initial time to wait between checking the internet connection
#HOSTS="www.google.com www.wikipedia.org 8.8.8.8 208.67.222.222"
HOSTS="www.google.com www.wikipedia.org "

PAR=$(dirname $(readlink -f $0))
OLD_LD_LIBRARY_PATH=$LD_LIBRARY_PATH
LD_LIBRARY_PATH=$PAR${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH

#non-zero exit code iff none of the hosts could be reached
check_net() {
    local ret=1
    for i in $HOSTS; do
        #ping -w2 -c2 $i > /dev/null 2>&1 && ret=0 && break
        curl -o /dev/null $i > /dev/null 2>&1 && ret=0 && break
    done
    echo $ret
}

#if dropbox is running; kill it. Then start dropbox
start_dropbox() {
local tmp=`ps ax|grep -E "[0-9] $PAR/dropbox"|grep -v grep`
    if [ -n "$tmp" ]; then
        kill -9 $(pidof dropbox) > /dev/null 2>&1
    fi
    exec $PAR/dropbox $@ > /dev/null 2>&1 &
}

#loop over: start dropbox iff check_net returns 0
#loop (and with it, the entire script) terminates when dropbox has been restarted,
#+ or the waiting time has exeeded 1500 seconds (it grows 50% with each iteration of the loop)
attempt_startup() {
    while [ $WAIT_TIME -lt 1500  ] ; do
        if [ $(check_net) -eq 0 ]; then
            start_dropbox
            exit
        fi
        sleep $WAIT_TIME
        #WAIT_TIME=$(($WAIT_TIME+$WAIT_TIME/2))
        let "WAIT_TIME += WAIT_TIME/2"
    done
}

start_dropbox
attempt_startup &