#!/bin/sh
# Copyright 2004  Slackware Linux, Inc., Concord, CA, USA
# Copyright 2004  Patrick J. Volkerding, Concord, CA, USA
# Copyright 2007, 2008, 2009, 2010, 2011, 2015, 2016, 2017  Patrick J. Volkerding, Sebeka, MN, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Modified by Robby Workman <rworkman@slackware.com> 26 November 2007
#   to add support for mkinitrd.conf - No additional license terms added
# Modified by Alan Hicks <alan@slackware.com> 27 November 2007 to enable
#   passing arguments to kernel modules - No additional license terms added
#   volkerdi - feel free to remove these :)
# Modified by Eric Hameleers <alien@slackware.com> 3 April 2008
#   to add support custom keymaps - No additional license terms added
# Modified by Patrick Volkerding <volkerdi@slackware.com> 17 Dec 2008
#   Added support to bail out if kernel modules are requested for a kernel
#   version that is not installed (thanks to Eric Hameleers), be more
#   verbose about showing modules added to the initrd (thanks to
#   Ellington Santos), and if "mount" returns /dev/root as the root device,
#   use readlink to resolve the device pointed to by the /dev/root
#   symlink, changed modprobe to use --ignore-install to avoid catching
#   custom "install" lines and causing /sbin/modprobe to be copied to the
#   initrd (thanks to Ken Milmore).
#   Of course, license terms remain unchanged.
# Modified by Eric Hameleers <alien@slackware.com> 3 March 2010
#   Add lukskey option (-K). Automatically add kernel modules listed in
#   load-kernel-modules if that file is executable.
#   Yada yada yada.
# Modified by Patrick Volkerding <volkerdi@slackware.com> 21 August 2012
#   Add Btrfs multi-device filesystem support option (-B).
# Modified by Robby Workman <rworkman@slackware.com> 08 March 2017
#   to add support for TRIM on LUKS root devs 
# Modified by Patrick Volkerding <volkerdi@slackware.com> 29 June 2017
#   Add support for prepending a microcode update archive (-P).

MKINITRD_VERSION=1.4.10

# Don't include these things from /lib/udev/ in the initrd image
LIBUDEV_BLACKLIST="\
  ipod-set-info \
  iphone-set-info \
  check-mtp-device \
  check-ptp-camera \
  udev-configure-printer \
  rules.d/60-openobex.rules \
  rules.d/85-regulatory.rules \
  "

print_usage() {
  cat << EOF
Usage: mkinitrd [OPTION]

mkinitrd creates an initial ramdisk (actually an initramfs cpio+gzip
archive) used to load kernel modules that are needed to mount the
root filesystem, or other modules that might be needed before the
root filesystem is available.  Other binaries may be added to the
initrd, and the script is easy to modify.  Be creative.  :-)

  -F      Use the contents of /etc/mkinitrd.conf (optional)
          If this is used in conjunction with any other options passed
          on the command line, the command-line options will override
          the config file options.  See mkinitrd.conf(5) for details.
  -c      Clear the existing initrd tree first
  -f      Filesystem to use for root partition (must be used with -r)
  --help  Display this message
  -h      Device to resume from hibernation. Needs to be the name of
          the swap partition holding the hibernation image.
  -k      Kernel version to use
  -l      Custom keymap to load. Like, 'nl' or 'de-latin1-nodeadkeys'
  -m      A colon (:) delimited list of kernel modules to load.
          Additional options may be added to use when loading the
          kernel modules (but in this case the entire list must be
          wrapped with double quotes).  Any dependencies of requested
          modules will also be added to the initrd.
  -o      Output image (default /boot/initrd.gz)
  -r      Root partition device (must be used with -f)
  -s      Initrd source tree (default /boot/initrd-tree/)
  -u      Include udev in the initrd
  -w      Time to wait until all disks are detected
  -C      A colon (:) delimited list of luks encrypted block devices to be
          unlocked by the initrd using cryptsetup. All devices that must
          be unlocked in order to access the root filesystem must be
          specified. (Use with '-r' parameter).
  -T      A colon (:) delimited list of luks encrypted block devices to be
          passed the "--allow-discards" option when unlocked by the initrd 
          using cryptsetup. This has the effect of allowing TRIM on SSD drives.
          Be sure your SSD supports this feature (correctly) before enabling
          it. See fstrim(8) for more information.
  -L      Add support for LVM partitions
  -K      Use a USB key (fat-formatted) to unlock the root LUKS volume
          The parameter value is filename of a keyfile, as well as the label
          (or uuid) of the partition this file is on.  This way, you can unlock
          your computer automatically if you have a USB stick with your LUKS
          key inserted at boot. A passphrase will still be asked if the LUKS
          key can not be found.
          For example, if your USB thumb drive has a FAT partition with label
          "TRAVELSTICK" and the actual keyfile is called "/keys/alien.luks",
          then you need to pass: -K LABEL=TRAVELSTICK:/keys/alien.luks
  -B      Add /sbin/btrfs to enable scanning for a root filesystem that is
          part of a Btrfs multi-device filesystem.
  -M      Add the files in /etc/modprobe.d/ and /lib/modprobe.d/ to the initrd
  -P      Prepend the output image with the microcode CPIO archive given in arguments.
  -R      Add support for RAID partitions
  -V      Display version number

A simple example:  Build an initrd for a reiserfs root partition:

  mkinitrd -c -m reiserfs

Another example:  Build an initrd image using Linux 2.6.35.4-smp kernel
modules for a system with an ext4 root partition on /dev/sdb3:

  mkinitrd -c -k 2.6.35.4-smp -m mbcache:jbd:ext4 -f ext4 -r /dev/sdb3

Note that if you are already logged in with /dev/sdb3 as your /
partition, and it is running ext4, this command works just the same:

  mkinitrd -c -m ext4

If run without options, mkinitrd will rebuild an initrd image using
the contents of the $SOURCE_TREE directory, or, if that directory
does not exist it will be created and populated, and then mkinitrd
will exit.

EOF
}

create_new_source_tree() {
  mkdir -p $SOURCE_TREE
  # Make sure a kernel module directory exists:
  mkdir -p $SOURCE_TREE/lib/modules/${KERNEL_VERSION}
  # Add the initrd-tree skeleton:
  ( cd $SOURCE_TREE ; tar xzf /usr/share/mkinitrd/initrd-tree.tar.gz )
  # Make sure we have any block devices that might be needed:

  SLOPPY_DEV_LIST=$(cat /proc/partitions)
  for device in $SLOPPY_DEV_LIST ; do
    if [ ! -r $SOURCE_TREE/dev/$device ]; then
      if [ -b /dev/$device ]; then
        if [ -L /dev/$device ]; then
          cp -a --parents $(readlink -e /dev/$device) $SOURCE_TREE
        fi
        cp -a --parents /dev/$device $SOURCE_TREE
      fi
    fi
  done
}

clear_source_tree() {
  if [ -d "$SOURCE_TREE" ]; then
    rm -rf $SOURCE_TREE
  fi
}

build_initrd_image() {
  # Make sure we have any block devices that might be needed:
  SLOPPY_DEV_LIST=$(cat /proc/partitions)
  for device in $SLOPPY_DEV_LIST ; do
    if [ ! -r $SOURCE_TREE/dev/$device ]; then
      if [ -b /dev/$device ]; then
        if [ -L /dev/$device ]; then
          cp -a --parents $(readlink -e /dev/$device) $SOURCE_TREE
        fi
        cp -a --parents /dev/$device $SOURCE_TREE
      fi
    fi
  done
  # Use the output image name written in the initrd-tree if present:
  if [ ! -z "$(cat $SOURCE_TREE/initrd-name)" ]; then
    OUTPUT_IMAGE=$(cat $SOURCE_TREE/initrd-name)
    if [ "$OUTPUT_IMAGE" = "$(basename $OUTPUT_IMAGE)" ]; then
      OUTPUT_IMAGE=/boot/$OUTPUT_IMAGE
    fi
    mkdir -p $(dirname $OUTPUT_IMAGE)
  fi
  # Wrap the initrd as an initramfs image and move it into place:
  ( cd $SOURCE_TREE
    rm -f $OUTPUT_IMAGE
    find . | cpio -o -H newc | gzip -9c > $OUTPUT_IMAGE
  )

  if [ ! -z "${MICROCODE_ARCH}" ] ; then
    cat ${MICROCODE_ARCH} ${OUTPUT_IMAGE} > ${OUTPUT_IMAGE}.2
    mv ${OUTPUT_IMAGE}.2 ${OUTPUT_IMAGE}
  fi
  echo "$OUTPUT_IMAGE created."
  echo "Be sure to run lilo again if you use it."
}

badconf_file() {
  # This won't really help with what's *wrong* with the file,
  # but it will at least give them a clue that there's a problem
  echo "/etc/mkinitrd.conf is bad or does not exist."
  echo "If the file does not exist, do not pass -F to mkinitrd."
  exit 1
}


unify_libs() {
  awk '/=. \// { print $3 }' | sort -u
}

copy_libs() {
  # First copy the essential glibc files:
  find /lib /lib64 -name "ld-*so*" -o -name "libnss_files*so*" -o -name "libnss_compat*so*" 2> /dev/null | xargs -I'{}' cp -P --parents '{}' $SOURCE_TREE/

  # Then copy all remaining libs our initrd files link against:
  COUNT=1
  PRFX=$(tempfile --prefix ldd-)
  TMPFILE=${PRFX}${COUNT}

  find $SOURCE_TREE -type f -exec ldd {} 2>/dev/null \; | unify_libs > $TMPFILE
  while [ "$COUNT" != "0" ]; do
    COUNT=$((COUNT+1))
    for i in $(cat ${TMPFILE}) ; do
      ldd $i 2>/dev/null
    done | unify_libs > ${PRFX}${COUNT}
    if [ $(cat $TMPFILE ${PRFX}${COUNT} | sort |uniq -u | wc -l) -eq 0 ]; then
      COUNT=0
    else
      TMPFILE=${PRFX}${COUNT}
    fi
    # emergency eject lever:
    if [ "$COUNT" = "42" ]; then
      COUNT=0
    fi
  done

  for i in $(cat ${PRFX}* | sort -u) ; do 
    cp -P --parents ${i}* $SOURCE_TREE
  done

  ( 
    cd $SOURCE_TREE
    for i in $(find -L . -type l -exec readlink -m /{} \; 2>/dev/null ) ; do
      cp -P --parents ${i} $SOURCE_TREE
    done 
  )

  rm ${PRFX}*
}

copy_modconf() {
  mkdir -p $SOURCE_TREE/etc $SOURCE_TREE/lib
  cp -a /etc/modprobe.d $SOURCE_TREE/etc
  cp -a /lib/modprobe.d $SOURCE_TREE/lib/
}
     
# If --help is given, print_usage and exit:
if echo $* | grep -wq '\--help' ; then
  print_usage
  exit 0
fi

# If -V given, print version and exit:
if echo $* | grep -wq '\-V' ; then
  echo "mkinitrd version $MKINITRD_VERSION"
  exit 0
fi

# Default values if these aren't previously set.
# Might be set from config file or by -s and -o options too.
SOURCE_TREE=${SOURCE_TREE:-/boot/initrd-tree}
OUTPUT_IMAGE=${OUTPUT_IMAGE:-""}
KERNEL_VERSION=${KERNEL_VERSION:-"$(uname -r)"}
# The initrd requires udev to function correctly:
UDEV=1

# Default actions without options:
if [ -z "$1" ]; then
  # We need a sensible default for this special case:
  OUTPUT_IMAGE=${OUTPUT_IMAGE:-/boot/initrd.gz}
  # If the output tree doesn't exist, create it and then exit:
  if [ ! -d $SOURCE_TREE ]; then
    echo "Nothing found at location $SOURCE_TREE, so we will create an"
    echo -n "initrd directory structure there... "
    create_new_source_tree
    echo "done."
    echo
    echo "Now cd to $SOURCE_TREE and install some modules in your"
    echo "module directory (lib/modules/${KERNEL_VERSION}).  Then see init"
    echo "for more information (there are a few other files to edit)."
    echo "Finally, run mkinitrd again once the initrd-tree is ready,"
    echo "and $OUTPUT_IMAGE will be created from it."
    echo
    exit 0
  else
    # If the source tree does exist, the default is to build the initrd
    # image from it and then exit:
    build_initrd_image
    exit 0
  fi
fi # default no-option actions

# Parse for the use config file option first or else the other command
# line options can not override /etc/mkinitrd.conf. 
for opt in "$@"; do
  if [ "$opt" = "-F" ]; then
      if [ -e /etc/mkinitrd.conf ]; then
        . /etc/mkinitrd.conf || badconf_file
      else
        badconf_file
      fi
  fi
done

# Parse options:
while [ ! -z "$1" ]; do
  case $1 in
    -c)
      CLEAR_TREE=1
      shift
      ;;
    -f)
      ROOTFS="$2"
      shift 2
      ;;
    -h)
      RESUMEDEV="$2" 
      shift 2
      ;;
    -k)
      KERNEL_VERSION="$2"
      shift 2
      ;;
    -l)
      KEYMAP="$2"
      shift 2
      ;;
    -m)
      MODULE_LIST="$2"
      shift 2
      ;;
    -o)
      # canonicalize filename:
      OUTPUT_IMAGE="$(readlink -m $2)"
      shift 2
      ;;
    -r)
      ROOTDEV="$2"
      shift 2
      ;;
    -s)
      # canonicalize filename:
      SOURCE_TREE="$(readlink -m $2)"
      shift 2
      ;;
    -u)
      UDEV=1
      shift
      ;;
    -w)
      WAIT="$2"
      shift 2
      ;;
    -C)
      CRYPT=1
      LUKSDEV="$2"
      shift 2
      ;;
    -K)
      LUKSKEY="$2"
      shift 2
      ;;
    -T)
      LUKSTRIM="$2"
      shift 2
      ;;
    -L)
      LVM=1
      shift
      ;;
    -B)
      BTRFS=1
      shift
      ;;
    -M)
      MODCONF=1
      shift
      ;;
    -P)
      # canonicalize filename:
      MICROCODE_ARCH="$(readlink -m $2)"
      if [ ! -e "${MICROCODE_ARCH}" ] ; then
        echo "Error, the microcode cpio archive ${MICROCODE_ARCH} does not exist."
        exit 1
      fi
      shift 2
    ;;

    -R)
      RAID=1
      shift
      ;;
    *) # unknown, prevent infinite loop
      shift
      ;;
  esac
done

# If kernel modules are needed but the kernel version is absent, exit now:
if [ ! -d /lib/modules/$KERNEL_VERSION ]; then
  echo "ERROR: No /lib/modules/$KERNEL_VERSION kernel modules tree found for kernel \"$KERNEL_VERSION\""
  exit 1
fi

# If clearing source tree was requested, do that first
if [ "$CLEAR_TREE" = "1" ]; then
  clear_source_tree
fi

# If there's no $SOURCE_TREE, make one now:
if [ ! -d "$SOURCE_TREE" ]; then
  create_new_source_tree
fi

# If $ROOTDEV and $ROOTFS are not set, assume we want the
# values for the currently mounted /
# (unless we find that values are already set in the initrd-tree):
if [ -z "$ROOTDEV" -a -z "$(cat $SOURCE_TREE/rootdev 2>/dev/null)" ]; then
  ROOTDEV=$(mount | grep ' on / ' | cut -f 1 -d ' ')
  if [ "$ROOTDEV" = "/dev/root" ]; then # find real root device
    ROOTDEV="/dev/$(readlink /dev/root)"
  fi
fi
if [ -z "$ROOTFS" -a -z "$(cat $SOURCE_TREE/rootfs 2>/dev/null)" ]; then
  ROOTFS=$(mount | grep ' on / ' | cut -f 5 -d ' ')
fi
# If needed, write them in the initrd-tree:
if [ ! -z "$ROOTDEV" ]; then
  echo $ROOTDEV > $SOURCE_TREE/rootdev
fi
if [ ! -z "$ROOTFS" ]; then
  echo $ROOTFS > $SOURCE_TREE/rootfs
fi

# If $WAIT is not set, assume we need only one second
# to have all devices done
# (unless we find that value is already set in the initrd-tree):
if [ -z "$WAIT" -a -z "$(cat $SOURCE_TREE/wait-for-root)" ]; then
  WAIT=1
  # ARM devices need even more time:
  case "$( uname -m )" in
    arm*) WAIT=4;;
  esac
fi
if [ ! -z "$WAIT" ]; then
  echo $WAIT > $SOURCE_TREE/wait-for-root
fi

# If no OUTPUT_IMAGE was specified, read it from the SOURCE_TREE if possible:
OUTPUT_IMAGE=${OUTPUT_IMAGE:-"$(cat $SOURCE_TREE/initrd-name)"}
# If we still have no value, apply the default:
OUTPUT_IMAGE=${OUTPUT_IMAGE:-"/boot/initrd.gz"}
# Finally, write the image name into the SOURCE_TREE:
echo "$OUTPUT_IMAGE" > $SOURCE_TREE/initrd-name

# Fill /resumedev with the swap partition holding the hibernation image
if [ ! -z "$RESUMEDEV" ]; then
  echo $RESUMEDEV > $SOURCE_TREE/resumedev
fi

# Add custom keymap support if one was given
if [ ! -z "$KEYMAP" ]; then
  echo $KEYMAP > $SOURCE_TREE/keymap
  cp /usr/share/mkinitrd/keymaps.tar.gz $SOURCE_TREE/etc/
fi

# If LUKSDEV was set in the config file, then we need to set CRYPT=1
if [ ! -z "$LUKSDEV" ]; then
  CRYPT=1
fi

# Check for LUKSTRIM
if [ ! -z "$LUKSTRIM" ]; then
  echo $LUKSTRIM > $SOURCE_TREE/lukstrim
fi

# If LUKSKEY was set in the config file, then give it a warm welcome:
if [ ! -z "$LUKSKEY" ]; then
  # $SOURCE_TREE/wait-for-root may have been configured earlier in the script,
  # but we require at least 5 seconds for the USB stick to settle
  # after insertion :
  if [ ! -s $SOURCE_TREE/wait-for-root ] || [ $(cat $SOURCE_TREE/wait-for-root) -lt 5 ]; then
    echo 5 > $SOURCE_TREE/wait-for-root
  fi

  # Several extra modules are needed to support a vfat formatted USB stick...
  # assuming here we are using a western codepage.
  # This possibly adds doublures, but we clean up the MODULE_LIST further down!
  MODULE_LIST="${MODULE_LIST}:xhci-pci:ohci-pci:ehci-pci:xhci-hcd:ohci-hcd:ehci-hcd:uhci-hcd:usb-storage:hid:usbhid:fat:nls_cp437:nls_iso8859-1:msdos:vfat"

  # Finally, write the lukskey to the initrd-tree:
  echo $LUKSKEY > $SOURCE_TREE/lukskey
fi

# Include RAID support in initrd
if [ ! -z "$RAID" ]; then
  if [ -r /sbin/mdadm -a -r /sbin/mdmon ]; then
    mkdir -p $SOURCE_TREE/sbin
    cp /sbin/mdadm $SOURCE_TREE/sbin/mdadm
    cp /sbin/mdmon $SOURCE_TREE/sbin/mdmon
    chmod 0755 $SOURCE_TREE/sbin/mdadm
    chmod 0755 $SOURCE_TREE/sbin/mdmon
    mkdir -p $SOURCE_TREE/lib/udev/rules.d
    echo 'KERNEL=="dm-[0-9]*", OPTIONS+="db_persist"' > \
      $SOURCE_TREE/lib/udev/rules.d/95-dm-initrd.rules
    if [ -r /etc/mdadm.conf ] ; then
      cp /etc/mdadm.conf $SOURCE_TREE/etc
    fi
  else
    echo "ERROR:  mdadm and/or mdmon binary is missing, RAID support not installed"
  fi
fi

# Include Btrfs support in initrd
if [ ! -z "$BTRFS" ]; then
  if [ -r /sbin/btrfs ]; then
    mkdir -p $SOURCE_TREE/sbin
    cp /sbin/btrfs $SOURCE_TREE/sbin/btrfs
    chmod 0755 $SOURCE_TREE/sbin/btrfs
  else
    echo "ERROR:  btrfs binary is missing, Btrfs support not installed"
  fi
fi

# Include udev in initrd
if [ ! -z "$UDEV" ]; then
  cp /sbin/udev* $SOURCE_TREE/sbin/
  cp -a /lib/udev $SOURCE_TREE/lib/
  # But we don't want all of /lib/udev
  for file in $(echo $LIBUDEV_BLACKLIST) ; do
    # Replace with a null script (avoids error spew):
    cat << EOF > $SOURCE_TREE/lib/udev/$file
#!/bin/ash
# This space is intentionally left blank
EOF
  done
fi

# Include LVM support in initrd
if [ ! -z "$LVM" ]; then
  if [ -f /sbin/lvm ]; then
    mkdir -p $SOURCE_TREE/sbin
    cp /sbin/lvm $SOURCE_TREE/sbin/lvm
    ( cd $SOURCE_TREE/sbin
      ln -s lvm vgchange 2>/dev/null
      ln -s lvm vgscan 2>/dev/null )
  else
    echo "LVM binary is missing, LVM support isn't installed"
    LVM=""
  fi
fi

# Include cryptsetup (LUKS) support in initrd
if [ ! -z "$CRYPT" ]; then
  if [ -e /usr/sbin/cryptsetup ]; then
    mkdir -p $SOURCE_TREE/sbin
    cp /usr/sbin/cryptsetup $SOURCE_TREE/sbin/cryptsetup
    if [ ! -e $SOURCE_TREE/sbin/udevadm ]; then
      cat << EOF > $SOURCE_TREE/sbin/udevadm
#!/bin/sh
sleep 3
EOF
      chmod 0755 $SOURCE_TREE/sbin/udevadm
    fi

    # Write the underlying luks device to the initrd-tree:
    echo $LUKSDEV > $SOURCE_TREE/luksdev
  else
    echo "Cryptsetup binary is missing, CRYPT support isn't installed"
    CRYPT=""
  fi
fi

# Include device mapper in initrd (needed for LUKS and LVM)
if [ ! -z "$CRYPT" -o ! -z "$LVM" ]; then
  cp /sbin/dmsetup $SOURCE_TREE/sbin/dmsetup
  find /lib /lib64 -name "libdevmapper*so*" 2> /dev/null | xargs -I'{}' cp -P --parents '{}' $SOURCE_TREE/
  if [ -z "${MODULE_LIST}" ] ; then
    MODULE_LIST="dm-mod"
  elif ! echo ${MODULE_LIST} | grep -q dm-mod ; then
    MODULE_LIST="$MODULE_LIST:dm-mod"
  fi
  mkdir -p $SOURCE_TREE/lib/udev/rules.d
  echo 'KERNEL=="dm-[0-9]*", OPTIONS+="db_persist"' > \
    $SOURCE_TREE/lib/udev/rules.d/95-dm-initrd.rules
fi

# Make module directory:
if [ ! -d $SOURCE_TREE/lib/modules/$KERNEL_VERSION ]; then
  mkdir -p $SOURCE_TREE/lib/modules/$KERNEL_VERSION
fi

# Copy kmod/modprobe stuff to initrd:
for i in kmod depmod insmod lsmod modinfo modprobe rmmod ; do
  rm -f $SOURCE_TREE/sbin/$i ;
  cp -a /sbin/$i $SOURCE_TREE/sbin ;
done

# Make sure modules.builtin and modules.order are there (for kmod):
cp /lib/modules/$KERNEL_VERSION/modules.{builtin,order} \
   $SOURCE_TREE/lib/modules/$KERNEL_VERSION

# If an executable $SOURCE_TREE/load_kernel_modules already exists, then
# we assume you will want to load the kernel modules mentioned in there.
# This means, you do not have to explicitly add those on the commandline:
if [ -x $SOURCE_TREE/load_kernel_modules ]; then
  MODULE_LIST="${MODULE_LIST}:$(cat $SOURCE_TREE/load_kernel_modules |grep  "^modprobe" |rev |cut -d/ -f1 |rev |cut -d. -f1)"
fi

# If the module list is not empty, copy the modules into place:
if [ ! -z "$MODULE_LIST" ]; then
  if grep -q "#modprobe reiserfs" $SOURCE_TREE/load_kernel_modules ; then
    rm -f $SOURCE_TREE/load_kernel_modules
    touch $SOURCE_TREE/load_kernel_modules
    chmod 755 $SOURCE_TREE/load_kernel_modules
    echo "# This is a script used to load the kernel modules." >> $SOURCE_TREE/load_kernel_modules
    echo "# To use it, chmod it 755, and then add the insmod" >> $SOURCE_TREE/load_kernel_modules
    echo "# lines needed to load your modules, like this:" >> $SOURCE_TREE/load_kernel_modules
    echo >> $SOURCE_TREE/load_kernel_modules
  fi

  # Sanitize the modules list first, before any further processing.
  # The awk command eliminates doubles without changing the order:
  MODULE_LIST=$(echo $MODULE_LIST |tr -s ':' '\n' |awk '!x[$0]++' |tr '\n' ':')
  MODULE_LIST=$(echo ${MODULE_LIST%:}) # Weed out a trailing ':'

  # Count number of modules
  # This INDEX number gives us an easy way to find individual
  # modules and their arguments, as well as tells us how many
  # times to run through the list
  if ! echo $MODULE_LIST | grep ':' > /dev/null ; then  # only 1 module specified
    INDEX=1
  else
    # Trim excess ':' which will screw this routine:
    MODULE_LIST=$(echo $MODULE_LIST | tr -s ':')
    INDEX=1
    while [ ! "$(echo "$MODULE_LIST" | cut -f $INDEX -d ':' )" = "" ]; do
      INDEX=$(expr $INDEX + 1)
    done
    INDEX=$(expr $INDEX - 1)      # Don't include the null value
  fi

  # Wrap everything in a while loop
  i=0
  while [ $i -ne $INDEX ]; do
    i=$(( $i + 1 ))
  
    # FULL_MOD is the module plus any arguments (if any)
    # MODULE is the module name
    # ARGS is any optional arguments to be passed to the kernel
    FULL_MOD="$(echo "$MODULE_LIST" | cut -d ':' -f $i)"
    MODULE="$(echo "$FULL_MOD" | cut -d ' ' -f 1 )"
    # Test for arguments
    if echo "$FULL_MOD" | grep ' ' > /dev/null; then
      ARGS=" $(echo "$FULL_MOD" | cut -d ' ' -f 2- )"
    else
      unset ARGS
    fi

  # Get MODULE deps and prepare modprobe lines
  /sbin/modprobe --set-version $KERNEL_VERSION --show-depends --ignore-install $MODULE 2>/dev/null \
    | grep "^insmod " | cut -f 2 -d ' ' | while read SRCMOD; do

      if ! grep -Eq " $(basename $SRCMOD .ko)(\.| |$)" $SOURCE_TREE/load_kernel_modules 2>/dev/null ; then
        LINE="$(echo "modprobe -v $(basename ${SRCMOD%%.gz} .ko)" )"

        # Test to see if arguments should be passed
        # Over-ride the previously defined LINE variable if so
        if [ "$(basename $SRCMOD .ko)" = "$MODULE" ]; then
          # SRCMOD and MODULE are same, ARGS can be passed
          LINE="$LINE$ARGS"
        fi

      fi

      if ! grep -qx "$LINE" $SOURCE_TREE/load_kernel_modules ; then
        echo "$LINE" >> $SOURCE_TREE/load_kernel_modules
      fi

      # Try to add the module to the initrd-tree.  This should be done
      # even if it exists there already as we may have changed compilers
      # or otherwise caused the modules in the initrd-tree to need
      # replacement.
      if cp -a --parents $SRCMOD $SOURCE_TREE 2>/dev/null; then
        echo "OK: $SRCMOD added."
        # If a module needs firmware, copy that too
        /sbin/modinfo -F firmware "$SRCMOD" | sed 's/^/\/lib\/firmware\//' |
        while read SRCFW; do
          if cp -a --parents "$SRCFW" $SOURCE_TREE 2>/dev/null; then
            echo "OK: $SRCFW added."
          else
            echo "WARNING:  Could not find firmware \"$SRCFW\""
          fi
        done
      else
        echo "WARNING:  Could not find module \"$SRCMOD\""
      fi

    done
  done

  # Pregenerate the module dependency information
  depmod -a -b $SOURCE_TREE ${KERNEL_VERSION}

  # Copy /{etc,lib}/modprobe.d/* if desired
  if [ ! -z $MODCONF ]; then
    copy_modconf
  fi

fi

# Copy needed libraries
copy_libs

# Make sure all libraries have symlinks:
/sbin/ldconfig $(readlink -f $SOURCE_TREE)/lib/ 2> /dev/null
/sbin/ldconfig $(readlink -f $SOURCE_TREE)/lib64/ 2> /dev/null
/sbin/ldconfig

# And finally, build the initrd:
build_initrd_image