testInterface() - /etc/rc.d/rc.network - puppylinux

# lines 136 to 167 of /etc/rc.d/rc.network
# http://www.pearltrees.com/s243a/testinterface-puppylinux/id16440735
# cutdown version of this function (can't just source net-setup.sh...)
testInterface()
{
  #INTERFACE="$1"
  echo -n "cheching if interface $INTERFACE is alive..."
  #sleep 1 # rerwin's original solution
  # no, move the sleep 1 so is only used for wireless
  #091108 old ifplugstatus now -0.18, latest is just 'ifplugstatus'...
  IFPLUGOLD=ifplugstatus
  IFPLUGNEW=ifplugstatus
  [ -x /sbin/ifplugstatus-0.18 ] && IFPLUGOLD=ifplugstatus-0.18
  [ -x /sbin/ifplugstatus-0.25 ] && IFPLUGNEW=ifplugstatus-0.25
  if ! $IFPLUGOLD "$INTERFACE" | grep -F -q 'link beat detected' ;then
    sleep 1
    if ! $IFPLUGNEW "$INTERFACE" | grep -F -q 'link beat detected' ;then
      sleep 2
      if ! $IFPLUGOLD "$INTERFACE" | grep -F -q 'link beat detected' ;then
        sleep 2
        if ! $IFPLUGNEW "$INTERFACE" | grep -F -q 'link beat detected' ;then
          # add ethtool test, just in case it helps at times...
          sleep 1
          if ! ethtool "$INTERFACE" | grep -Fq 'Link detected: yes' ; then
            echo "no"
            return 1
          fi
        fi
      fi
    fi
  fi
  echo "yes"
  return 0
} # end of testInterface