* merged branch 'initramfs-ng' back intro trunk - requires careful testing ...

git-svn-id: http://svn.openslx.org/svn/openslx/openslx/trunk@2055 95ad53e4-c205-0410-b2fa-d234c58c8868

1 files changed, 916 insertions, 0 deletions

diff --git a/initramfs/stage3-stuff/init b/initramfs/stage3-stuff/init
new file mode 100755
index 00000000..5fb70550
--- /dev/null
+++ b/initramfs/stage3-stuff/init
@@ -0,0 +1,916 @@
+#!/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
+
+# 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/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 ${opts} in
+    # from IPAPPEND
+    BOOTIF=*)
+      bootmac=$(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=}
+      [ $DEBUGLEVEL -eq 8 -o $DEBUGLEVEL -eq 20 ] && \
+        echo "** SLX init started near $(sysup)"
+    ;;
+    # essid for WLAN boot (experimental, might be moved to a module component
+    # in later versions
+    essid=*)
+      essid=${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="$macaddr"
+      error "$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 ${vci} from kernel command line or initramfs-setup) ...
+[ -z "$nodhcp" ] && ( rundhcp ${vci}
+  waitfor /tmp/confviadhcp 20000
+  echo "dhcp finished at $(sysup)" >/tmp/dhcp-done
+  . /tmp/confviadhcp
+  if [ -n "$noipyet" ] ; then
+    # 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) \
+          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; ) &
+# 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 "${D_ETCEXCL}\n*~\n*.old\n*-\nxorg.conf*" >>/tmp/etc.exclude
+  # if ld.so.cache is to be generated then do not copy the file
+  [ -n "${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
+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 "$init_wait" nonfatal
+done
+
+mount 2>/dev/null | grep -q /lib/modules/${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 /mnt/tmp/scratch 2>/dev/null
+mount -n --move /dev /mnt/dev
+
+runinithook '95-cleanup'
+
+# kill hwautocfg, servconfig
+killall -9 hwautocfg servconfig 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 $(cat /tmp/watchdogpid) 2>/mnt/dev/null
+# move logfile into stage4 filesystem (if exists)
+[ -f /var/log/slx-boot.log ] && mv /var/log/slx-boot.log \
+  /mnt/var/log/slx-s3boot.log
+
+# unmount /proc and unset all old,unneeded environment variables
+umount -n /proc
+unset client debug date initrd ip bldroot nfsroot rootfs ticks vci vga
+unset BOOT_IMAGE KCMDLINE KERNEL MODPRV NWMODULES OLDPWD UDEVD_EVENT_TIMEOUT \
+  SLXVERSION UDEVD_EXPECTED_SEQNUM PATH
+
+runinithook '99-handing-over'
+
+# new style of pivoting (switch_root or run-init)
+exec /bin/switch_root -c dev/console /mnt /sbin/init || error "$init_runinit"