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#!/bin/sh

umask 0022
export PATH='/usr/bin:/sbin:/bin'

# Defaults
keep="n"
CONFDIR="/etc/initramfs-tools"
verbose="n"
errors_to="2>/dev/null"
BUSYBOXDIR="/usr/lib/initramfs-tools/bin/"
# BUSYBOXDIR="/bin"

OPTIONS=`getopt -o d:ko:r:v --long supported-host-version:,supported-target-version: -n "$0" -- "$@"`

# Check for non-GNU getopt
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

eval set -- "$OPTIONS"

while true; do
case "$1" in
-d)
CONFDIR="$2"
shift 2
if [ ! -d "${CONFDIR}" ]; then
echo "${0}: ${CONFDIR}: Not a directory" >&2
exit 1
fi
;;
-o)
outfile="$2"
shift 2
;;
-k)
keep="y"
shift
;;
-r)
ROOT="$2"
shift 2
;;
-v)
verbose="y"
shift
;;
--supported-host-version)
supported_host_version="$2"
shift 2
;;
--supported-target-version)
supported_target_version="$2"
shift 2
;;
--)
shift
break
;;
*)
echo "Internal error!" >&2
exit 1
;;
esac
done

# FIXME: remove after Lenny (needed for Etch linux-images)
if [ -n "$supported_host_version" ] || [ -n "$supported_target_version" ]; then
if [ -n "$supported_host_version" ]; then
host_upstream_version="${supported_host_version%%-*}"
fi
if [ -n "$supported_target_version" ]; then
target_upstream_version="${supported_target_version%%-*}"
if dpkg --compare-versions "$target_upstream_version" lt "2.6.12"; then
exit 2
fi
fi
echo "Depreciation warning: use ramdisk=mkinitramfs-kpkg."
exit 0
fi

# For dependency ordered mkinitramfs hook scripts.
. /usr/share/initramfs-tools/scripts/functions
. /usr/share/initramfs-tools/hook-functions

. "${CONFDIR}/initramfs.conf"
EXTRA_CONF=''
for i in /usr/share/initramfs-tools/conf.d/* ${CONFDIR}/conf.d/*; do
EXTRA_CONF="${EXTRA_CONF} $(basename $i \
| grep '^[[:alnum:]][[:alnum:]\._-]*$' | grep -v '\.dpkg-.*$')";
done
# FIXME: deprecated those settings on mkinitramfs run
# these conf dirs are for boot scripts and land on initramfs
for i in ${EXTRA_CONF}; do
if [ -e ${CONFDIR}/conf.d/${i} ]; then
. ${CONFDIR}/conf.d/${i}
elif [ -e /usr/share/initramfs-tools/conf.d/${i} ]; then
. /usr/share/initramfs-tools/conf.d/${i}
fi
done

# source package confs
for i in /usr/share/initramfs-tools/conf-hooks.d/*; do
if [ -e "${i}" ]; then
. "${i}"
fi
done

if [ -n "${UMASK}" ]; then
umask "${UMASK}"
fi

if [ -z "${outfile}" ]; then
usage
fi

touch "$outfile"
outfile="$(readlink -f "$outfile")"

# And by "version" we really mean path to kernel modules
# This is braindead, and exists to preserve the interface with mkinitrd
if [ ${#} -ne 1 ]; then
version="$(uname -r)"
else
version="${1}"
fi

# Check that we're using a new enough kernel version, first for ourselves,
# then for each of the hooks, which can have a MINKVER variable defined
check_minkver ${version}
check_minkver ${version} /usr/share/initramfs-tools/hooks
check_minkver ${version} ${CONFDIR}/hooks

case "${version}" in
/lib/modules/*/[!/]*)
;;
/lib/modules/[!/]*)
version="${version#/lib/modules/}"
version="${version%%/*}"
;;
esac

case "${version}" in
*/*)
echo "$PROG: ${version} is not a valid kernel version" >&2
exit 1
;;
esac

if [ -d "${outfile}" ]; then
echo "${outfile} is a directory"
exit 1
fi

MODULESDIR="/lib/modules/${version}"

if [ ! -e "${MODULESDIR}" ]; then
echo "Cannot find ${MODULESDIR}"
exit 1
fi
if [ ! -e "${MODULESDIR}/modules.dep" ]; then
depmod ${version}
fi

DESTDIR="$(mktemp -t -d mkinitramfs_XXXXXX)" || exit 1
chmod 755 "${DESTDIR}"
__TMPCPIOGZ="$(mktemp -t mkinitramfs-OL_XXXXXX)" || exit 1

DPKG_ARCH=`dpkg --print-architecture`

# Export environment for hook scripts.
#
export MODULESDIR
export version
export CONFDIR
export DESTDIR
export DPKG_ARCH
export verbose
export KEYMAP
export MODULES
export COMPCACHE_SIZE

# Private, used by 'catenate_cpiogz'.
export __TMPCPIOGZ

for d in bin conf/conf.d etc lib/modules sbin scripts ${MODULESDIR}; do
mkdir -p "${DESTDIR}/${d}"
done

# Copy the modules.order file in
if [ -f "${MODULESDIR}/modules.order" ]; then
cp -p "${MODULESDIR}/modules.order" \
"${DESTDIR}${MODULESDIR}/modules.order"
fi

# MODULES=list case. Always honour.
for x in "${CONFDIR}/modules" /usr/share/initramfs-tools/modules.d/*; do
if [ -f "${x}" ]; then
add_modules_from_file "${x}"
fi
done

# MODULES=most is default
case "${MODULES}" in
dep)
dep_add_modules
;;
most)
auto_add_modules
;;
netboot)
auto_add_modules base
auto_add_modules net
;;
list)
# nothing to add
;;
*)
echo "mkinitramfs: Warning unsupported MODULES setting: ${MODULES}."
echo "mkinitramfs: Falling back to MODULES=most."
auto_add_modules
;;
esac

# Have to do each file, because cpio --dereference doesn't recurse down
# symlinks.

# klibc
ln -s /usr/lib/klibc/bin/* ${DESTDIR}/bin
ln -s /lib/klibc-*.so ${DESTDIR}/lib
rm -f ${DESTDIR}/bin/kinit* ${DESTDIR}/bin/gzip

copy_exec /usr/share/initramfs-tools/init /init

# add existant boot scripts
for b in $(cd /usr/share/initramfs-tools/scripts/ && find . \
-regextype posix-extended -regex '.*/[[:alnum:]_]+$' -type f); do
option=$(sed '/^OPTION=/!d;$d;s/^OPTION=//;s/[[:space:]]*$//' "/usr/share/initramfs-tools/scripts/${b}")
[ -z "${option}" ] || eval test -n \"\${$option}\" -a \"\${$option}\" != \"n\" || continue

[ -d "${DESTDIR}/scripts/$(dirname "${b}")" ] \
|| mkdir -p "${DESTDIR}/scripts/$(dirname "${b}")"
cp -p "/usr/share/initramfs-tools/scripts/${b}" \
"${DESTDIR}/scripts/$(dirname "${b}")/"
done
for b in $(cd "${CONFDIR}/scripts" && find . \
-regextype posix-extended -regex '.*/[[:alnum:]_]+$' -type f); do
option=$(sed '/^OPTION=/!d;$d;s/^OPTION=//;s/[[:space:]]*$//' "${CONFDIR}/scripts/${b}")
[ -z "${option}" ] || eval test -n \"\${$option}\" -a \"\${$option}\" != \"n\" || continue

[ -d "${DESTDIR}/scripts/$(dirname "${b}")" ] \
|| mkdir -p "${DESTDIR}/scripts/$(dirname "${b}")"
cp -p "${CONFDIR}/scripts/${b}" "${DESTDIR}/scripts/$(dirname "${b}")/"
done

echo "DPKG_ARCH=${DPKG_ARCH}" > ${DESTDIR}/conf/arch.conf
copy_exec "${CONFDIR}/initramfs.conf" /conf
for i in ${EXTRA_CONF}; do
if [ -e "${CONFDIR}/conf.d/${i}" ]; then
copy_exec "${CONFDIR}/conf.d/${i}" /conf/conf.d
elif [ -e "/usr/share/initramfs-tools/conf.d/${i}" ]; then
copy_exec "/usr/share/initramfs-tools/conf.d/${i}" /conf/conf.d
fi
done

# ROOT hardcoding
if [ -n "${ROOT}" ]; then
echo "ROOT=${ROOT}" > ${DESTDIR}/conf/conf.d/root
fi

# Busybox
if [ "${BUSYBOX}" = "n" ] || [ ! -e ${BUSYBOXDIR}/busybox ]; then
mv ${DESTDIR}/bin/sh.shared ${DESTDIR}/bin/sh
# those root need busybox
eval "$(mount | awk '/ \/ / {print "r_dev=" $1; exit}')"
if [ "${r_dev#/dev/mapper/}" != "${r_dev}" ] \
|| [ "${r_dev#/dev/md}" != "${r_dev}" ]; then
echo "Warning: Busybox is required for successful boot!"
fi
else
# Busybox is configured to prefer its own applets, so remove
# duplication from klibc.
for cmd in `${BUSYBOXDIR}/busybox | sed -n '/functions:$/,$p' \
| tail -n +2 \
| sed -e 's/[[:space:]]*//g; s/,$//; s/,/\n/g; /busybox/d'`; do
rm -f ${DESTDIR}/bin/${cmd}
done
rm -f ${DESTDIR}/bin/sh
rm -f ${DESTDIR}/bin/busybox
copy_exec ${BUSYBOXDIR}/busybox /bin/busybox
ln -s ${BUSYBOXDIR}/busybox ${DESTDIR}/bin/sh
# klibc's version is just wrong; patch sent upstream by maks
rm -f ${DESTDIR}/bin/chroot
# klibc's version can't display mounts, which casper needs; fuse
# needs /bin/mount to exist, so add a symlink
rm -f ${DESTDIR}/bin/mount
ln -s busybox ${DESTDIR}/bin/mount
# ... but some scripts expect /bin/sleep to exist. Boo.
ln -s busybox ${DESTDIR}/bin/sleep
# Useless
for cmd in minips nuke sh.shared; do
rm -f ${DESTDIR}/bin/${cmd}
done
fi

copy_exec /usr/lib/initramfs-tools/bin/wait-for-root /sbin

# Modutils
copy_exec /sbin/modprobe /sbin
copy_exec /sbin/depmod /sbin
copy_exec /sbin/rmmod /sbin
mkdir -p "${DESTDIR}/etc/modprobe.d"
cp -a /etc/modprobe.d/* "${DESTDIR}/etc/modprobe.d/"

# util-linux
copy_exec /sbin/blkid /sbin

# workaround: libgcc always needed on old-abi arm
if [ "$DPKG_ARCH" = arm ] || [ "$DPKG_ARCH" = armeb ]; then
cp -a /lib/libgcc_s.so.1 "${DESTDIR}/lib/"
fi

run_scripts /usr/share/initramfs-tools/hooks optional
run_scripts "${CONFDIR}"/hooks optional

# cache run order
for b in $(cd "${DESTDIR}/scripts" && find . \
-mindepth 1 -type d); do
cache_run_scripts "${DESTDIR}" "/scripts/${b#./}"
done

# generate module deps
depmod -a -b "${DESTDIR}" ${version}
rm "${DESTDIR}"/lib/modules/${version}/modules.*map

# Apply DSDT to initramfs
if [ -e "${CONFDIR}/DSDT.aml" ]; then
copy_exec "${CONFDIR}/DSDT.aml" /
fi

# Remove any looping or broken symbolic links, since they break cpio.
(cd "${DESTDIR}" && find . -type l -printf '%p %Y\n' | sed -n 's/ [LN]$//p' | xargs -rL1 rm -f)

[ "${verbose}" = y ] && echo "Building cpio ${outfile} initramfs"
(
# work around lack of "set -o pipefail" for the following pipe:
# cd "${DESTDIR}" && find . | cpio --quiet --dereference -o -H newc | gzip >"${outfile}"
compress="gzip"
# lzop compression was introduced in 2.6.35.4-1 kernel
if dpkg --compare-versions "${version}" ge "2.6.35.4-1"; then
compress="lzop"
fi
exec 3>&1
eval `
    # http://cfaj.freeshell.org/shell/cus-faq-2.html
    exec 4>&1 >&3 3>&-
    cd "${DESTDIR}"
    {
        find . 4>&-; echo "ec1=$?;" >&4
    } | {
        cpio --quiet --dereference -o -H newc 4>&-; echo "ec2=$?;" >&4
    } | ${compress} >"${outfile}"
    echo "ec3=$?;" >&4
`
if [ "$ec1" -ne 0 ]; then exit "$ec1"; fi
if [ "$ec2" -ne 0 ]; then exit "$ec2"; fi
if [ "$ec3" -ne 0 ]; then exit "$ec3"; fi
) || exit 1

if [ -s "${__TMPCPIOGZ}" ]; then
cat "${__TMPCPIOGZ}" >>"${outfile}" || exit 1
fi

if [ "${keep}" = "y" ]; then
echo "Working files in ${DESTDIR} and overlay in ${__TMPCPIOGZ}"
else
rm -rf "${DESTDIR}"
rm -rf "${__TMPCPIOGZ}"
fi

exit 0
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