#!/bin/ash
# Copyright (c) 2003..2006 - RZ Uni Freiburg
# Copyright (c) 2006..2008 - OpenSLX GmbH
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your feedback to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org
#
# Main script for new type of initial ramdisk for OpenSLX linux stateless
# clients version 4
#############################################################################

# fixme: shut down if script fails - this does not really work in case of
# script crash
trap "exec (sleep 30; echo o>/proc/sysrq-trigger)" \
  SIGHUP SIGINT SIGPIPE SIGTERM SIGKILL

# device files get their own filesystem (to be move mounted later)
devdir="/dev"
mount -n -t tmpfs -o 'size=25%,mode=0755' initramfsdevs ${devdir}

# mount the important standard directories
[ ! -f /proc/cpuinfo ] && mount -n -t proc proc /proc
[ ! -d /sys/class ] && mount -n -t sysfs sysfs /sys

# create basic device files an directories (in dev - for most hardware related
# devices mdev should handle that)
for i in "/dev/mem c 1 1" "/dev/null c 1 3" "/dev/zero c 1 5" \
         "/dev/urandom c 1 9" "/dev/kmsg c 1 11" "/dev/tty0 c 4 0" \
         "/dev/tty1 c 4 1" "/dev/tty2 c 4 2" "/dev/tty3 c 4 3" \
         "/dev/tty4 c 4 4" "/dev/tty5 c 4 5" "/dev/tty6 c 4 6" \
         "/dev/tty7 c 4 7" "/dev/tty8 c 4 8" "/dev/tty9 c 4 9" \
         "/dev/tty10 c 4 10" "/dev/tty c 5 0" "/dev/console c 5 1" \
         "/dev/ptmx c 5 2" "/dev/psaux c 10 1" "/dev/agpgart c 10 175" \
         "/dev/fb0 c 29 0" "/dev/rtc c 10 135" "/dev/xconsole p"; do
  mknod $i
done
mkdir -p ${devdir}/pts ${devdir}/shm ${devdir}/.udevdb ${devdir}/.udev \
  ${devdir}/.initramfs /var/log

# start device auto discovery/setup service of busybox
echo >/etc/mdev.conf
mdev -s

# source functions file common for all distros, messages contains all error
# and info output (for some reason the error output is not produced properly
# - crash)

# how do the localization here? There is not yet a country-Variable
. /etc/messages
. /etc/functions || ( echo -e $init_mff && sleep 100 )
. /etc/distro-functions || ( echo -e $init_dff && sleep 100 )

# configuration settings for this slx system's environment
. /etc/slxsystem.conf 2>/dev/null || ( echo -e ${init_sscf} && \
  sleep 100 )
# initramfs-setup configuration (common initial settings for all clients using
# a certain InitRamFS generated by slxconfig-demuxer)
[ -f /etc/initramfs-setup ] && . /etc/initramfs-setup 2>/dev/null

export PATH=/bin:/sbin:/usr/bin/:/usr/sbin
export date="${slxconf_date}"

export DEBUGLEVEL=0
export KERNEL="${slxconf_kernver}"
export NWMODULES="${slxconf_listnwmod}"
export DISTRO_NAME="${slxconf_distro_name}"
export DISTRO_VER="${slxconf_distro_ver}"
export SYSTEM_NAME="${slxconf_system_name}"
export SLXVERSION="${slxconf_slxver}"

# do not use dnbd cache file
nodnbdcache="yes"

# set a default LAN interface, might be modified for WLAN or on machines with
# more than one ethernet card built in
nwif="eth0"

# load usb modules for keyboard (reenable usb keyboards, otherwise the
# admin has to wait until second run of hwsetup late in stage3) and the
# network adaptor modules, search for pci modules to load later on
hwautocfg base

# if no kernel version is set, try to get it directly from /proc
if [ -z $KERNEL ] ; then
  KERNEL=$(cat /proc/version)
  KERNEL=${KERNEL#*version }
  KERNEL=${KERNEL% (*) (*}
fi

# set defaults for some important variables, might be overwritten via
# kernel commandline
tmpfssize="50%"
cowsize="50%"
rwdir=/dev/shm
nfsro="nfs"

runinithook '00-started'

# run pre init script and user defined preinit.local, copied by mkdxsinitrd
# from /var/lib/openslx/config/... in stage2
preinit
[ -x /bin/preinit.local ] && /bin/preinit.local


# switch off the several configuration methods, will be switched on
# according to kernel commandline settings
echo "noldap" > /tmp/ldap-done

# external configuration file retrieval (per tftp) must be done, as otherwise
# we will never get the initramfs-setup file. By default, we try a predefined
# standard path (.../tftpboot/client-config/ ...)
file="yes"

# read kernel commandline
read KCMDLINE < /proc/cmdline
export KCMDLINE
# read the system wide initramfs-setup and then the kernel commandline
for opts in $(sed "s/#.*//" /etc/initramfs-setup) ${KCMDLINE} ; do
  case ${opts} in
    # shut down pc
    shutdown)
      cat <<EOL



                #####
               #     # #    # #    # ##### ##### # #    #  ####
               #       #    # #    #   #     #   # ##   # #    #
                #####  ###### #    #   #     #   # # #  # #
                     # #    # #    #   #     #   # #  # # #  ###
               #     # #    # #    #   #     #   # #   ## #    #
                #####  #    #  ####    #     #   # #    #  ####

                ######                          ######   #####
                #     #  ####  #    # #    #    #     # #     #
                #     # #    # #    # ##   #    #     # #
                #     # #    # #    # # #  #    ######  #
                #     # #    # # ## # #  # #    #       #
                #     # #    # ##  ## #   ##    #       #     #
                ######   ####  #    # #    #    #        #####



EOL
      echo "o" >/proc/sysrq-trigger
    ;;
    # from IPAPPEND
    BOOTIF=*)
      bootmac=$(echo ${opts} | sed "s/.*=01-//;s/-/:/g")
    ;;
    # localization
    country=*)
      COUNTRY=${opts#country=}
      grep -q -E "country=" /etc/initramfs-setup && 
        echo -e "\n# localization information gotten via kernel command line \
in $0\ncountry=\"${COUNTRY}\"" >>/etc/initramfs-setup
    ;;
    # single token for debugging ...
    debug)
      DEBUGLEVEL=1
    ;;
    # ... or a specified debug level
    debug=*)
      DEBUGLEVEL=${opts#debug=}
      if [ $DEBUGLEVEL -eq 8 -o $DEBUGLEVEL -eq 20 ] ; then
        echo "** SLX init started near $(sysup)"
      elif [ $DEBUGLEVEL -ge 3 -a $DEBUGLEVEL -le 20 ] ; then
        # create, start a debug shell process
        echo "Debug shell started on second console (tty2)"
        echo -e "#!/bin/ash\nash" >/bin/debugshell
        chmod u+x /bin/debugshell
        getty -i -n -l /bin/debugshell 38400 tty2 &
      fi
    ;;
    # essid for WLAN boot (experimental, might be moved to a module component
    # in later versions
    essid=*)
      essid=${opts#essid=}
    ;;
    # if configuration should not be gathered by dhcp client
    nodhcp)
      nodhcp="yes"
      echo "nodhcp" >/tmp/dhcp-done
    ;;
    nofile)
      unset file
      echo "nofile" >/tmp/file-done
    ;;
    # if ldap configuration should be triggered
    ldap)
      ldap="yes"
      rm /tmp/ldap-done
    ;;
    # ldap configuration with host and port to contact (base)
    ldap=*)
      ldap="yes"
      rm /tmp/ldap-done
    ;;
    # file source with tftp server and file location on the server
    file=*|file)
      if [ "${opts}" != "file" ] ; then
        fileprot=$(uri_token ${opts#file=} prot)
        fileserv=$(uri_token ${opts#file=} server)
        filepath=$(uri_token ${opts#file=} path)
      fi
    ;;
    # if ld.so.cache should be generated; should be switched on when composing
    # rootfs from more than one source
    ldsc)
      ldsc="yes";;
    # simple union of base ro rootdir with tempfs on top
    unionfs)
      unionfs=1;;
    # additional source to unify root filesystem with; the top layer will be
    # the tempfs
    unionfs=*)
      unionfs=1
      uniondirs=${opts#unionfs=}
      # most probably it is a good idea to run ldconfig, so enable it
      ldsc="yes"
    ;;
    # same for AUFS; alternative to unionfs
    aufs)
      aufs=1;;
    aufs=*)
      aufs=1
      uniondirs=${opts#aufs=}
      # most probably it is a good idea to run ldconfig, so enable it
      ldsc="yes"
    ;;
    # if cowloop should be used, only ontop of network block device and in
    # combination with classical fs, like ext2 useful
    cowloop=*)
      cowloop=1
      #cowsize=${opts#cowloop=}
    ;;
    # rootfs will void the variables (d)nbdroot, nfsroot ...
    # fixme: allow multiple rootfs sources to be unioned!?
    # if strinstr " " "$rootfs" ...
    rootfs=*)
      rootfs=${opts#rootfs=}
      rootfs=${rootfs#\"}
      rootfs=${rootfs%%\"}
      srvproto=$(uri_token $rootfs prot)
      case $srvproto in
        nfs)
          # nfsroot consists now of two different parts
          nfspath=$(uri_token $rootfs path)
          nfsserver=$(uri_token $rootfs server)
          grep -q -E "nfsserver" /etc/initramfs-setup || \
            echo -e "# nfs root information gotten via kernel command \
line in $0\nnfsserver=\"${nfsserver}\"\nnfspath=\"${nfspath}\"" \
              >>/etc/initramfs-setup
        ;;
        *nbd*)
          bldmod=$srvproto
          # get settings for nbd-client, filesystem equals to path in URI
          # notation (remove leading slash from filesystem at the end)
          bldhost=$(uri_token $rootfs server)
          bldport=$(uri_token $rootfs port)
          bldrfst=$(uri_token $rootfs path)
          bldrfst=${bldrfst#/*}
        ;;
        aoe)
          echo "Not implemented yet"
          bldmod=
        ;;
        iscsi)
          echo "Not implemented yet"
          bldmod=
          #iscsiserver=$(uri_token $rootfs server)
          #iscsiport=$(uri_token $rootfs port)
          #iscsitarget=$(uri_token $rootfs path)
        ;;
        lbdev)
          # use a local device for mounting root block device with given
          # filesystem, e.g. rootfs=lbdev://sda2/squashfs
          bldmod="sata_sil sd_mod"
          blddev=$(uri_token $rootfs server)
          bldfst=$(uri_token $rootfs path)
          bldfst=${bldfst#/*}
        ;;
      esac
    ;;
    # size of cache dnbd should use within ram
    dcsize=*)
      dnbdcachesize=${opts#dcsize=};;
    # ip configuration client-ip:server-ip:gateway:netmask
    ip=*)
      ipinfo=${opts#ip=};;
    # deprecated: nfs server and path (will be removed soon)
    nfsroot=*)
      nfsroot=${opts#nfsroot=}
      echo -e "\n# nfs root information gotten via kernel command line in \n\
$0\n# deprecated: please use rootfs=nfs://...\nnfsroot=\"${nfsroot}\"\n" \
>> /etc/initramfs-setup
    ;;
    # size of tempfs if not max. 50% of RAM should be used
    tmpfssize=*)
      tmpfssize=${opts#tmpfssize=};;
    # vendor code identifier for dhcp requests, that way OpenSLX clients could
    # be distinguished from other (dhcp) clients
    vci=*)
      vci=${opts#vci=};;
    xenbr)
      xenbr=1;;
  esac
done

runinithook '05-have-kernelvars'

# at this point a timer should be started to ensure an automated reboot
# or halt of the machine if SLX init does not succeed (e.g. missing kernel
# module for the network adaptor)
if [ ${DEBUGLEVEL} -lt 3 -o ${DEBUGLEVEL} = 8 ] ; then
  cat<<EOF > /bin/watchdog
#!/bin/ash
echo \$$ > /tmp/watchdogpid
[ ! -f /proc/version ] && mount -n -t proc proc /proc
sleep 120 2> /dev/null
echo "o" > /proc/sysrq-trigger
EOF
  chmod u+x /bin/watchdog
  watchdog &
fi

# check if at least one type of IP configuration is availabe
if [ -n "$nodhcp" -a -z "$ldap" -a -z "$ipinfo" -a $srvproto != "lbdev" ]
  then echo -e "# You did not specify any advanced configuration mode for \
your clients. You\n# might want to add the token 'dhcp' for DHCP config, \
'file(=source)'\n# for config file get via TFTP or 'ldap(=source)' for LDAP \
configuration to\n# your kernel command line." >> /etc/initramfs-setup
  if strinfile "clientip" /etc/initramfs-setup ; then
    # IP configuration seems to be present in initramfs-setup file
    # TODO: FIX this, as it will clobber all kernel-cmdline values!
    . /etc/initramfs-setup
    ipinfo="ip=$clientip:$serverip:$gateway:$subnet_mask"
  else
    error "$init_errip"
  fi
fi

# for ldap configuration at least basic IP setup is needed to contact the
# server
[ -n "$nodhcp" -a -n "$ldap" -a -z "$ipinfo" ] && error "$init_errldap"
# set debug level and logfile
if [ $DEBUGLEVEL -eq 20 ] ; then
  echo "** Setting debuglevel to ${DEBUGLEVEL} at $(sysup)"
elif [ $DEBUGLEVEL -ne 0 ] ; then
  echo "Setting debuglevel to ${DEBUGLEVEL}"
fi
export MODPRV=" "
export LOGFILE
if [ "${DEBUGLEVEL}" -gt 0 -a "${DEBUGLEVEL}" != 8 ] ; then
  # set LOGFILE and move it later on into stage4
  LOGFILE="/var/log/slx-boot.log"
  echo "Starting OpenSLX client boot logging at $(date)" >$LOGFILE
  echo "1 4 1 7" >/proc/sys/kernel/printk
  [ "${DEBUGLEVEL}" -ge 2 ] && MODPRV="-v"
  [ "${DEBUGLEVEL}" -gt 3 -a "${DEBUGLEVEL}" -le 10 ] && {
    set -x
    # and the kernel too
    echo "7 7 7 7" >/proc/sys/kernel/printk; }
  [ "${DEBUGLEVEL}" -gt 10 -a "${DEBUGLEVEL}" -le 20 ] && set +x
else
  # switch off most of kernel debug output
  echo "0 0 0 0" >/proc/sys/kernel/printk
  # modprobe should stay quiet
  MODPRV="-q"
  LOGFILE="/dev/null"
  # redirect console (after /dev/null is available, and /dev mounted)
  #[ "${DEBUGLEVEL}" != 8 ] && exec < /dev/console > /dev/null 2>&1
fi

# check for WLAN specific settings and check for multiple ethernet interfaces
# (we have at least the mac of PXE boot in bootmac)
if [ -n "${essid}" ] ; then
  # WLAN setup will most probably change the network interface name stored in
  # nwif (to wlan0 or something like that)
  wlanlinksetup
  #echo "Starting shell for testing of WLAN setup procedure"
  #/bin/ash
else
  # check here for the active ethernet link
  for ethif in eth0 eth1 eth2 eth3 ; do
    macaddr=$(ip link show dev $ethif 2>/dev/null | \
      sed -n "/ether [0-9e-f]\{2\}:.*/p" | sed -e "s/.*ether //;s/ .*//")
    # if there is no bootmac present in kernel commandline any checks are
    # useless
    if [ -z "$bootmac" ] ; then
      bootmac="$macaddr"
      [ "$ethif" != "eth0" ] && error "$init_bootmac" nonfatal
    fi
    if [ "$macaddr" = "$bootmac" ] ; then
      nwif=$ethif
      break
    elif [ "x$macaddr" = "x" ] ; then
      # if the macaddr is empty on the first interface tried, there is no
      # network adaptor visible (missing kernel module)
      if [ "$ethif" = "eth0" ] ; then
        error "$init_errnwad"
      else
        # assume a forcedeth problem here (nonmatching MACs)
        error "$init_nveth" nonfatal
        macaddr=${bootmac}
      fi
      break
    fi
  done
fi

# set up loopback networking
[ $DEBUGLEVEL -eq 20 ] && echo "** starting ip config at $(sysup)"
ip link set dev lo up 2>/dev/null
ip addr add 127.0.0.1/8 dev lo 2>/dev/null
ip link set dev $nwif up  2>/dev/null || error "$init_noeth"

# XEN bridge config (fixme: should be moved to plugin a special hook might be 
# needed at this point)
[ -n "$xenbr" ] && xenbr_config

# analyze ip information from the kernel command line and put parts
# of it into several variables
if [ -n "$ipinfo" ] ; then
  getip () {
    local val="$ipinfo:"; i=$(($1 - 1));
    while [ $i -gt 0 ] ; do
      val=${val#*:} ; i=$(($i - 1));
    done;
  echo $val|sed "s/:.*//"; }
  clientip=$(getip 1)
  serverip=$(getip 2)
  gateway=$(getip 3)
  subnet_mask=$(getip 4)
  echo -e "# ip configuration written by $0 script:\nclientip=$clientip\n\
subnet_mask=$subnet_mask\ngateway=$gateway\nserverip=$serverip" \
    >>/etc/initramfs-setup
  # set static ip address
  ip addr add $clientip/$(ipcalc -s -p $clientip $subnet_mask|sed s/.*=//) \
    dev $nwif 2>/dev/null
  ip route add default via $gateway 2>/dev/null
else
  noipyet="yes"
fi
# get configuration data via dhcp (with vendor code identifier if present
# in ${vci} from kernel command line or initramfs-setup) ...
if [ -z "$nodhcp" ] ; then
  ( rundhcp ${vci}; echo "dhcp finished at $(sysup)" >/tmp/dhcp-done ) &
  if [ -n "$noipyet" ] ; then
    waitfor /tmp/dhcp-done 20000
    . /tmp/confviadhcp
    # by now there should be a proper ip configuration present
    if [ -z "$clientip" -o -z "$subnet_mask" -o -z "$gateway" -o \
         -z "$broadcast_address" ] ; then error "$init_errdhcp"
    else
      { ip addr add \
          $clientip/$(ipcalc -s -p $clientip $subnet_mask|sed s/.*=//) \
          broadcast $broadcast_address dev $nwif 2>/dev/null && \
        ip route add default via $gateway 2>/dev/null; } || \
          error "$init_erripcfg"
    fi
    # fixme: to be checked!!
    #  else
    #    if [ -n "$file" -a "$srvproto" = "lbdev" ] ; then
    #      error "$init_erripcfg" nonfatal
    #    else
    #      error "$init_erripcfg"
    #    fi
    #  fi
  fi
fi
# check if serverip is set as variable @@@serverip@@@
sed "s,@@@serverip@@@,$serverip," -i /etc/initramfs-setup
[ $DEBUGLEVEL -eq 20 ] && echo "** finished ip config at $(sysup)"

# on some network adaptors we need to wait for the link to come up
dmesg | grep -q "link down" && for i in 1 1 1 1  ; do 
  dmesg | grep -q "link up" && break
  [ $DEBUGLEVEL -ge 1 ] && echo "network: waited half a second for the \
link to come up" >>$LOGFILE
  sleep $i
done
# ... or ldap if available (in background)
[ -n "$ldap" ] && ldapconf &
# ... or via (t)ftp/http file get (in background)
[ -n "$file" ] && fileget &

runinithook '15-have-ip-config'

# if root filesystem should be imported via local or a network block device
if [ -n "${bldmod}" ] ; then
  # load block device driver(s) if needed
  for module in ${bldmod} ; do
    modprobe ${MODPRV} ${module} || error "$init_errbld"
  done
  [ -x /bin/mdev ] && mdev -s
  [ -z "$bldrfst" ] && bldrfst=squashfs
  bldhost=$(checkip $bldhost)
  if [ $DEBUGLEVEL -eq 20 ] ; then
    echo "** starting setup of ${bldmod} at $(sysup)"
  else
    echo "Stateless client using ${bldmod} on $bldhost:$bldport with $bldrfst"
  fi
  # fixme: check for fs in /proc/filesystems before trying to load the module
  modprobe ${MODPRV} ${bldrfst} || error "$init_errbld" nonfatal

  case "${srvproto}" in
    # network block device present in standard kernel
    nbd)
      RDEV=/dev/nbd0
      waitfor "${RDEV}" 20000 || error "$init_nbddev"
      i=0
      while ! nbd-client $bldhost $bldport ${RDEV} ; do
        usleep 100000
        i=$(($i + 1))
        if [ $i -ge 1000 ] ; then
          error "$init_nbds"; break
        fi
      done
      usleep 100
      echo deadline > /sys/block/nbd0/queue/scheduler
      # echo "32" > /sys/block/nbd0/queue/read_ahead_kb
      ;;
    # dnbd2 by Vito Di Leo
    dnbd2)
      RDEV=/dev/vnbd0
      waitfor "${RDEV}" 20000 || error "$init_nbddev"
      # quickhack, should be read in from URI
      echo 1 > /sys/block/vnbd0/config/vid
      echo 1 > /sys/block/vnbd0/config/rid
      # check for others in initramfs-setup and then kernel cmdline
      rootfs="$(sed -n "/rootfs=/p" /etc/initramfs-setup| \
        sed "s,rootfs=,,;s,\",,g") "
      [ "$rootfs" = " " ] && \
        rootfs="$(cat /proc/cmdline|sed "s,.*rootfs=\",,;s,\".*,,") "
      i=0
      # assume no more than 16 different dnbd2 servers (default 4)
      while [ "x$bldhost" != "x" -a $i -lt 16 ]; do
        #echo "I: $i R: $rootfs P:$bldport H:$bldhost"
        echo $bldhost $bldport > /sys/block/vnbd0/server${i}/sock
        i=$(($i + 1))
        rootfs=${rootfs#* }
        bldsp=$(echo ${rootfs}|sed "s, .*,,")
        bldhost=$(uri_token $bldsp server)
        bldport=$(uri_token $bldsp port)
      done
      # the cfq scheduler seem not a good idea here
      echo deadline > /sys/block/vnbd0/queue/scheduler
      # needed for some reason to settle initialization
      sleep 1
      i=0
      while [ $(cat /sys/block/vnbd0/config/running) != 1 ] ; do
        usleep 100000
        echo 1 > /sys/block/vnbd0/config/running
        i=$(($i + 1))
        if [ $i -ge 50 ] ; then
          error "$init_dnbd2s"; break
        fi
      done
      echo "64" > /sys/block/vnbd0/queue/read_ahead_kb
      ;;
    # dnbd by Thorsten Zitterell
    dnbd)
      # quickhack
      RDEV=/dev/dnbd0
      if [ -z $nodnbdcache ] ; then  # variable not really used yet
        mkdir /dnbd
        mount -n -o 'size=10%' -t tmpfs tmpfs /dnbd
        ( cat /dev/zero > /dnbd/cache 2>/dev/null || echo "ok" >/tmp/cache ) &
        clientopt="-c /dnbd/cache"
        waitfor /tmp/cache 10000
      fi
      [ $(echo $bldhost|sed "s,\..*,,") -ge 224 ] && \
        ip route add 224.0.0.0/4 dev $nwif
      waitfor /dev/dnbd0 10000 || error "$init_nbddev"
      echo "dnbd-client -b $bldhost -d $RDEV $clientopt"
      while ! dnbd-client -b $bldhost -d $RDEV $clientopt ; do
        usleep 10000
      done
      # problem with squashfs and cfq scheduler
      echo noop > /sys/block/dnbd0/queue/scheduler
      echo 0 > /sys/block/dnbd0/queue/read_ahead_kb
      ;;
    lbdev)
      # using clients local block device (disk partition is to be specified)
      RDEV=/dev/$blddev
      ;;
  esac
  RWRO="ro"
  if [ -n "${cowloop}" -a -x /bin/cowdev ] ; then
    modprobe ${MODPRV} cowloop || {
      error "$init_loadcow" nonfatal
      unset cowloop; }
    [ -x /bin/mdev ] && mdev -s
  fi
  if [ -n "${cowloop}" ] ; then
    if [ -n "${unionfs}" -o -n "${aufs}" ] ; then
      error "$init_cownobld"
      unset unionfs aufs
    fi
    echo "Using Copy-on-Write block device for rw access"
    mount -n -t tmpfs -o size=${cowsize} ramfs ${rwdir}
    mkdir /dev/cow && mknod /dev/cow/ctl b 241 255
    usleep 200
    ln -s /dev/cowloop0 /dev/cow/0
    # fixme - cowdev depending on blockdev choosen above ...
    cowdev -a /dev/nbd0 ${rwdir}/nbd.cow
    usleep 200
    RWRO="rw"
    RDEV=/dev/cow/0
    # run ldconfig if not switched off via kernel command line
    ldcfg
  else
    # use normal UnionFS behaviour because rootfs is not NFS
    unset nfsro
  fi
  # finally mount the configured network/local block device
  for i in 0 5000 20000 100000 500000 1000000 ; do
    usleep $i
    mount -n -t $bldrfst -o $RWRO $RDEV /mnt 2>/dev/null && break
  done
  [ $DEBUGLEVEL -eq 20 ] && echo "** finished blockdev setup stuff at $(sysup)"
elif [ -n ${iscsiserver} ] ; then
  [ $DEBUGLEVEL -eq 20 ] && echo "** started setting up iSCSI initiator at \
$(sysup)"
  #if [ -n ${iscsitarget} ] ; then
  #  echo "InitiatorName=${iscsitarget}"|sed "s,@@@serverip@@@,$serverip," \
  #    >/etc/initiatorname.iscsi
  #else
  # discovery
  #fi
  #echo -e "node.startup = automatic">/etc/iscsid.conf
  #iscsid -c /etc/iscsid.conf
  # the cowloop part has to be moved (option for iscsi devices too)
  # and should be generalized for nbd, dnbd, iscsi
fi

# if no type of root filesystem is passed via kernel command line try
# information gathered from dhcp process (only valid for nfs)
if [ -z "${bldmod}" -a -z "${bldhost}" -a -z "${nfsserver}" ] ; then
  # information has to be read from dhcp and ldap configuration
  # cfgcomplete merges all configuration files
  cfgcomplete
fi

# mount nfs rootfs
if [ -z "${bldmod}" -a -z "${bldserver}" ] ; then
  [ $DEBUGLEVEL -eq 20 ] && echo "** started nfs mount"
  # read in extended initramfs-setup
  . /etc/initramfs-setup
  # prefer nfsserver and nfspath from kernel commandline over the information
  # gotten from dhcp server
  if [ -n "${nfsserver}" -a -n "${nfspath}" ] ; then
    # load the nfs module if needed
    nfsmod
    # check if nfsserver is set as variable @@@serverip@@@
    nfsserver=$(checkip $nfsserver)
    nfsroot=${nfsserver}:${nfspath}
  else
    # we got a problem here
    error "$init_nfssp" fatal
  fi
  for proto in tcp udp fail; do
    [ $proto = "fail" ] && { error "$init_nfs"; break; }
    mount -n -t nfs -o ro,nolock,${proto} ${nfsroot} /mnt && break
  done
  [ $DEBUGLEVEL -eq 20 ] && echo "** finished nfs mount at $(sysup)"
fi

runinithook '20-have-network-root'

# get the complete collection of kernel modules available
mount -n --bind /mnt/lib/modules/${KERNEL} /lib/modules/${KERNEL} || \
  error "$init_moddir"
# start hardware configuration as background process if not a special
# debuglevel (21) is used for the option of manual hwautocfg start
if [ ${DEBUGLEVEL} = 21 ] ; then
  echo "You can run 'hwautocfg main &' manually now ..."
  /bin/ash
else
  [ $DEBUGLEVEL -eq 20 ] && echo "** started hwautocfg in background at \
$(sysup)"
  hwautocfg main &
fi

runinithook '25-started-hw-config'

union_type=""
# try to use unionfs for rw access if available
if [ -n "${unionfs}" ]; then
  modprobe ${MODPRV} unionfs  && union_type="UnionFS"
  if [ -z "$union_type" ]; then
    error "$init_loadufs" nonfatal
    unset unionfs
    # if unionfs is not available, check for aufs and inform user
    modprobe ${MODPRV} -n aufs && error $init_noufs_butaufs
  fi
fi
# try to use aufs for rw access if available
if [ -n "${aufs}" ]; then
  modprobe ${MODPRV} aufs   && union_type="AUFS"
  if [ -z "$union_type" ]; then
    error "$init_loadaufs" nonfatal
    unset aufs
    # if aufs is not available, check for unionfs and inform user
    modprobe ${MODPRV} -n unionfs && error $init_noaufs_butufs
  fi
fi

# setup of client root filesystem dependent on the availability of UnionFS
if [ -n "${unionfs}" -o -n "${aufs}" ] ; then
  echo "Using ${union_type} for rw access"
  mkdir -p ${rwdir}/union ${rwdir}/uniontmp /rorootfs
  mount -n -t tmpfs none ${rwdir}/uniontmp
  # hack for handling unionfs with patched run-init
  mount -n --move /mnt /rorootfs
  if [ "$union_type" == "UnionFS" ]; then
    mount -n -t unionfs -o dirs=${rwdir}/uniontmp:/rorootfs=${nfsro}ro \
      none /mnt
  elif [ "$union_type" == "AUFS" ]; then
    mount -n -t aufs -o br:/${rwdir}/uniontmp:/rorootfs=ro none /mnt
  fi
  mkdir -p /mnt/uniontmp
  mount -n --move ${rwdir}/uniontmp /mnt/uniontmp
  chmod 0755 /mnt/uniontmp /mnt
  # run ldconfig if switched on via kernel command line (token ldsc) or
  # triggered by unionized root filesystem
  ldcfg
elif [ -z "${cowloop}" ] ; then
  echo "Using bind mounts to ramdisk for rw access"
  mount -n -t tmpfs -o size=${tmpfssize} ramfs ${rwdir}
  for path in ${D_BINDMPTS} ; do
    mkdir -p ${rwdir}/${path} >/dev/null 2>&1
    mount -n --bind ${rwdir}/${path} /mnt/${path}
    [ ${DEBUGLEVEL} -gt 1 -a ${DEBUGLEVEL} != 8 ] && \
      echo "Created ${rwdir}/${path} and mounted it to /mnt/$path"
  done
  # see above ...
  ldcfg
  # save the RO directories mentioned in the distro-specific
  # config to a temporary directory. They will later on be restored
  for path in ${D_RODIRSINRW}; do
    if [ -d /mnt/${path} ] ; then
      list="${path} ${list}"
      # exclude them from etc copy process too
      echo "${path}/*"|sed -e "s,/root/,,;s,^/,," >>/tmp/etc.exclude
      mkdir -p /root/${path} >/dev/null 2>&1
      mount -n --bind /mnt/${path} /root/${path} >/dev/null 2>&1
    fi
  done
  for path in /etc/${D_SYSCONFDIR} ${D_DIRINBINDMNT} ${list}; do
    mkdir -p ${rwdir}/${path}
  done
  testmkd ${rwdir}/var/tmp 1777
  # exclude all sysv runlevel link stuff
  for i in ${D_RCDIRS} ${D_INITBOOTD} ; do
    echo "*$i/*" >>/tmp/etc.exclude
  done
  # add list of files to be excluded and common excludes to the filter list
  echo -e "-\ndhcp*\n*~\n*.old\n*-\nxorg.conf*" >>/tmp/etc.exclude
  # if ld.so.cache is to be generated then do not copy the file
  [ -n "${ldsc}" ] && echo -e "ld.so.cache*" >>/tmp/etc.exclude
  # for tar exclude lists might be used, more difficult for cp
  cd /mnt
  tar -X /tmp/etc.exclude -cp etc/*|tar -xp -C ${rwdir} 2>/dev/null
  cd /
  mount -n --bind ${rwdir}/etc /mnt/etc
  mount -n --bind ${rwdir}/var /mnt/var
  # get the "covered" mounts back into filesystem structure
  for path in ${list}; do
    mount -n --move /root/$path /mnt/$path #>>$LOGFILE 2>&1
  done
  #rm -rf /root/* >/dev/null 2>&1
  # run some specific stuff !?
fi

runinithook '50-have-layered-fs'

# script for stuff to execute during early bootup
d_mkrlscript init boot.slx "Running configuration postponed from InitRamFS"
echo "fs complete at $(sysup)" >/tmp/fscmpl

# write debug file information after filesystem setup completed
echo -e "# /etc${D_SYSCONFDIR}/logfile - file created by $0 (initramfs \
from $date)\n#\n# logfile \
for linux diskless client specific debugging output\nLOGFILE=\"$LOGFILE\"\n#\
\n# debug level\nDEBUGLEVEL=\"$DEBUGLEVEL\"" \
  > /mnt/etc/${D_SYSCONFDIR}/logfile || error "$init_errlog"

# run distribution independent and dependent configuration of files and
# services (offer debug shell in runlevel 22)
if [ ${DEBUGLEVEL} = 22 ] ; then
  /bin/ash
else
  servconfig &
fi

for path in @@@COMDIRINDXS@@@ ${D_DIRINDXS} ${D_DIRINBINDMNT} ; do
  testmkd /mnt/${path}
done
# Needed writable subdirs nested in readonly subdirs of writable one
for path in ${D_RWDIRSINRO}; do
  mount -n -t tmpfs none /mnt/${path}
done
for i in /var/run/utmp /var/log/wtmp /var/log/lastlog /etc/mtab ; do
  echo -n > /mnt/$i
done
chown 65534:0 /mnt/var/lib/nobody
# /proc/bus/usb might be deprecated in newer kernels ...
echo -e "# /etc/fstab - file generated by $0 (initramfs from $date)\n#\
\tOpenSLX Project, info@openslx.com\n\nrootfs\t\t/\t\trootfs\t\tro\t\t 0 0\n\
proc\t\t/proc\t\tproc\t\tdefaults\t 0 0\ninitramdevs\t/dev\t\ttmpfs\
\t\trw\t\t 0 0\ndevpts\t\t/dev/pts\tdevpts\t\tmode=0620,gid=5\t 0 0" \
  >/mnt/etc/fstab || error "$init_fstab"
echo -e "rootfs / rootfs rw 0 0\ninitramdevs /dev tmpfs rw\
 0 0" > /mnt/etc/mtab

# copy library cache if generated
if [ -n "${ldsc}" ] ; then
  # creating library cache takes a while ...
  if waitfor /tmp/ldcfg 50000 ; then
    test -s /mnt/tmp/ld.so.cache && \
      mv /mnt/tmp/ld.so.cache /mnt/etc/ld.so.cache
  else
    error "$init_errldcfg"
  fi
else
  error "$init_infldcfg" nonfatal
fi

runinithook '60-have-servconfig'

# wait a while for hardware setup to complete and start cleanup procedure
[ $DEBUGLEVEL -gt 1 ] && echo "Waiting for hwautocfg to finish ..."
waitfor /tmp/hwcfg 20000 || error "$init_errhw"
hwautocfg finish &

# wait a while for services setup to complete
[ $DEBUGLEVEL -gt 1 ] && echo "Waiting for servconfig to finish ..."
waitfor /tmp/svcfg 10000 || error "$init_errsw"
# IP configuration is complete and should not be updated automatically
killall -9 udhcpc 2>/dev/null

# if uniondirs is not set yet, maybe the unions were given via initramfs-setup
if [ -z "$uniondirs" ]; then
  if [ "$union_type" == "AUFS" ]; then
    # does it contain "://"?
    if [ "$aufs" != "${aufs#*://}" ]; then
      uniondirs="$aufs"
    fi
  elif [ "$union_type" == "UnionFS" ]; then
    # does it contain "://"?
    if [ "$unionfs" != "${unionfs#*://}" ]; then
      uniondirs="$unionfs"
    fi
  fi
fi
# if locations are given that should be unioned with the fs root, do it
if [ -n "$uniondirs" ]; then
  include_in_fsroot_union "$union_type" "$uniondirs"
fi

runinithook '70-before-plugins'

# check for any plugin-specific runlevel scripts and run them, if found:
if [ ${DEBUGLEVEL} = 25 ] ; then
  /bin/ash
else
  if [ -d /etc/plugin-init.d ]; then
    for plugin_starter in /etc/plugin-init.d/*.sh; do
      if [ -e $plugin_starter ]; then
        [ $DEBUGLEVEL -gt 0 ] \
          && echo "Running plugin starter $plugin_starter ..."
        [ $DEBUGLEVEL -eq 15 ] \
          && sed '/^#!/ a\\set -x' -i $plugin_starter
        . $plugin_starter >>/tmp/plugin_starter 2>&1
      fi
    done
  fi
fi

runinithook '80-after-plugins'

# create links for initial stage4 boot scripts
initial_boot

runinithook '85-have-initial-boot'

# post init for some distro specific
postinit
[ -s /initramfs/postinit.local ] && {
  mv /initramfs/postinit.local /bin/postinit.local;
  chmod u+x /bin/postinit.local; }
[ -f /bin/postinit.local ] && {
  [ $DEBUGLEVEL -gt 0 ] && \
    echo "Running postinit.local - if boot stops here, check the script!"
  /bin/postinit.local; }

# start a debug shell in higher debug levels
[ $DEBUGLEVEL -gt 2 -a $DEBUGLEVEL != 8 ] && /bin/ash

runinithook '90-postinit-done'

# unmount the bind mounted modules directory and nfs /tmp/scratch (if present)
export ticks
for ticks in 0 1 2 5 10 20 30; do
  sleep $ticks && umount -n /lib/modules/${KERNEL} 2>/dev/null && break
  error "$init_wait" nonfatal
done
mount 2>/dev/null | grep -q "/tmp/scratch type nfs" && \
  for ticks in 0 1 2 5 10 20 30; do
    sleep $ticks && umount -n /tmp/scratch 2>/dev/null && break
  done

mount 2>/dev/null | grep -q /lib/modules/${KERNEL} && error "$init_errumnt"
# check for inittab file (might fail for new style init -> upstart)
test -f /mnt/etc/inittab || test -d /mnt/etc/event.d || error "$init_erritab"
# close runlevel script for stuff to execute during early bootup
d_mkrlscript close boot.slx ""
# put /tmp into stage4 mtab and add stuff to stage4 fstab
sed -n "s,/mnt,,;/\/tmp /p" /proc/mounts >> /mnt/etc/mtab
[ -f /tmp/fstab ] && cat /tmp/fstab >> /mnt/etc/fstab
# preparations to leave initramfs - umounting ...
umount -n /sys || error "$init_errsys" nonfatal
umount -n /proc/bus/usb >/dev/null 2>&1
chmod 1777 /mnt/dev/shm /mnt/tmp 2>/dev/null
mount -n --move /dev /mnt/dev

runinithook '95-cleanup'

# kill hwautocfg, servconfig
killall -9 hwautocfg servconfig debugshell 2>/mnt/dev/null
# runtimer
[ $DEBUGLEVEL -eq 8 -o $DEBUGLEVEL -eq 20 ] && \
  echo "** SLX init ended near $(sysup)"
# kill the watchdog (autopoweroff, if stage3 init never finishes)
[ -f /tmp/watchdogpid ] && kill $(cat /tmp/watchdogpid) 2>/mnt/dev/null
# move logfile into stage4 filesystem (if exists)
[ -f /var/log/slx-boot.log ] && mv /var/log/slx-boot.log \
  /mnt/var/log/slx-s3boot.log

# unmount /proc and unset all old,unneeded environment variables
umount -n /proc
unset client debug date initrd ip bldroot nfsroot rootfs ticks vci vga
unset BOOT_IMAGE KCMDLINE KERNEL MODPRV NWMODULES OLDPWD UDEVD_EVENT_TIMEOUT \
  SLXVERSION UDEVD_EXPECTED_SEQNUM PATH

runinithook '99-handing-over'

# new style of pivoting (switch_root or run-init)
exec /sbin/switch_root -c dev/console /mnt /sbin/init || error "$init_runinit"