path: root/mkinitramfs

#!/bin/sh

set -eu

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

# Defaults
keep="n"
CONFDIR="/etc/initramfs-tools"
verbose="n"
test -e /bin/busybox && BUSYBOXDIR=/bin
test -e /usr/lib/initramfs-tools/bin/busybox && BUSYBOXDIR=/usr/lib/initramfs-tools/bin
export BUSYBOXDIR

OPTIONS=`getopt -o c:d:ko:r:v -n "$0" -- "$@"`

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

eval set -- "$OPTIONS"

while true; do
	case "$1" in
	-c)
		compress="$2"
		shift 2
		;;
	-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
		;;
	--)
		shift
		break
		;;
	*)
		echo "Internal error!" >&2
		exit 1
		;;
	esac
done

# 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
	[ -e $i ] && EXTRA_CONF="${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

# Check userspace and kernel support for compressed initramfs images
if [ -z "${compress:-}" ]; then
	compress=${COMPRESS}
else
	COMPRESS=${compress}
fi

if ! command -v "${compress}" >/dev/null 2>&1; then
	compress=gzip
	COMPRESS=gzip
	[ "${verbose}" = y ] && \
		echo "No ${COMPRESS} in ${PATH}, using gzip"
fi

if ! `grep -q -i ^config_rd_${COMPRESS%p} /boot/config-${version}` ; then
	compress=gzip
	[ "${verbose}" = y ] && \
		echo "linux-2.6 misses ${COMPRESS} support, using gzip"
fi

[ "${compress}" = lzop ] && compress="lzop -9"

if [ -d "${outfile}" ]; then
	echo "${outfile} is a directory" >&2
	exit 1
fi

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

if [ ! -e "${MODULESDIR}" ]; then
	echo "WARNING: missing ${MODULESDIR}"
	echo "Device driver support needs thus be built-in linux image!"
fi
if [ ! -e "${MODULESDIR}/modules.dep" ]; then
	depmod ${version}
fi

DESTDIR="$(mktemp -d ${TMPDIR:-/tmp}/mkinitramfs_XXXXXX)" || exit 1
chmod 755 "${DESTDIR}"

# do not execute cache_run_scripts() if mounted with noexec
NOEXEC=""
fs=$(df $DESTDIR | tail -1 | awk '{print $6}')
if [ -n "$fs" ] && mount | grep -q "on $fs .*noexec" ; then
	NOEXEC=1
fi

__TMPCPIOGZ="$(mktemp ${TMPDIR:-/tmp}/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 BUSYBOX

# 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 "W: mkinitramfs: unsupported MODULES setting: ${MODULES}."
	echo "W: mkinitramfs: Falling back to MODULES=most."
	auto_add_modules
	;;
esac

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

cp -p /usr/share/initramfs-tools/init ${DESTDIR}/init

# add existant boot scripts
for b in $(cd /usr/share/initramfs-tools/scripts/ && find . \
	-regextype posix-extended -regex '.*/[[:alnum:]\._-]+$' -type f); do
	[ -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:]\._-]+$' -type f); do
	[ -d "${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}" > ${DESTDIR}/conf/arch.conf
cp -p "${CONFDIR}/initramfs.conf" ${DESTDIR}/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

if ! command -v ldd >/dev/null 2>&1 ; then
	echo "WARNING: no ldd around - install libc-bin" >&2
	exit 1
fi

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

# 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
run_scripts "${CONFDIR}"/hooks

# cache boot run order
if [ -n "$NOEXEC" ]; then
	echo "W: TMPDIR is mounted noexec, will not cache run scripts."
else
	for b in $(cd "${DESTDIR}/scripts" && find . -mindepth 1 -type d); do
		cache_run_scripts "${DESTDIR}" "/scripts/${b#./}"
	done
fi

# generate module deps
depmod -a -b "${DESTDIR}" ${version}
rm -f "${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.
[ "${verbose}" = y ] && xargs_verbose="-t"
(cd "${DESTDIR}" && find . -type l -printf '%p %Y\n' | sed -n 's/ [LN]$//p' \
	| xargs ${xargs_verbose:-} -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 >"${outfile}" || exit 1
exec 3>&1
eval `
	# http://cfaj.freeshell.org/shell/cus-faq-2.html
	exec 4>&1 >&3 3>&-
	cd  "${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
	echo "E: mkinitramfs failure find $ec1 cpio $ec2 $compress $ec3"
	exit "$ec1"
fi
if [ "$ec2" -ne 0 ]; then
	echo "E: mkinitramfs failure cpio $ec2 $compress $ec3"
	exit "$ec2"
fi
if [ "$ec3" -ne 0 ]; then
	echo "E: mkinitramfs failure $compress $ec3"
	exit "$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