genkernel_fork/defaults/linuxrc

#!/bin/sh

. /etc/initrd.defaults
. /etc/initrd.scripts

# Clean input/output
exec >${CONSOLE} <${CONSOLE} 2>&1

if [ "$$" != '1' ]
then
	echo '/linuxrc has to be run as the init process as the one'
	echo 'with a PID of 1. Try adding init="/linuxrc" to the'
	echo 'kernel command line or running "exec /linuxrc".'
	exit 1
fi

mount -t proc -o noexec,nosuid,nodev proc /proc >/dev/null 2>&1
mount -o remount,rw / >/dev/null 2>&1
mount -t tmpfs -o rw,nosuid,nodev,relatime,mode=755 none /run 2>&1
mount -t tmpfs none /dev/shm 2>&1

/bin/busybox --install -s

if [ "$0" = '/init' ]
then
	[ -e /linuxrc ] && rm /linuxrc
fi

CMDLINE=$(cat /proc/cmdline)
FAKE_ROOT=''
FAKE_INIT=''
FAKE_ROOTFLAGS=''
INIT_OPTS=''
ROOTFSTYPE='auto'
CRYPT_SILENT=0
QUIET=''

mkdir -p /etc/cmdline /etc/modprobe.d
for x in ${CMDLINE}
do
	case "${x}" in
		real_root=*)
			REAL_ROOT=${x#*=}
		;;
		root=*)
			FAKE_ROOT=${x#*=}
		;;
		subdir=*)
			SUBDIR=${x#*=}
		;;
		real_init=*)
			REAL_INIT=${x#*=}
		;;
		init=*)
			FAKE_INIT=${x#*=}
		;;
		init_opts=*)
			INIT_OPTS=${x#*=}
		;;
		cdroot)
			CDROOT=1
		;;
		cdroot=*)
			CDROOT=1
			CDROOT_DEV=${x#*=}
		;;
		cdroot_type=*)
			CDROOT_TYPE=${x#*=}
		;;
		cdroot_marker=*)
			CDROOT_MARKER=${x#*=}
		;;
		loop=*)
			LOOP=${x#*=}
		;;
		looptype=*)
			LOOPTYPE=${x#*=}
		;;
		isoboot=*)
			ISOBOOT=${x#*=}
		;;
		domdev)
			USE_MDEV=1
		;;
		dolvm)
			USE_LVM_NORMAL=1
		;;
		domdadm)
			USE_MDADM=1
		;;
		dodmraid)
			USE_DMRAID_NORMAL=1
		;;
		dodmraid=*)
			DMRAID_OPTS=${x#*=}
			USE_DMRAID_NORMAL=1
		;;
		domultipath)
			good_msg "Booting with multipath activated."
			USE_MULTIPATH_NORMAL=1
		;;
		dozfs*)
			USE_ZFS=1

			if [ "${x#*=}" = 'force' ]
			then
				ZPOOL_FORCE=-f
			fi
		;;
		quiet)
			QUIET=1
		;;
		debug)
			DEBUG='yes'
		;;
		scandelay=*)
			SDELAY=${x#*=}
		;;
		scandelay)
			SDELAY=3
		;;
		doload=*)
			MDOLIST=${x#*=}
			MDOLIST=$(echo ${MDOLIST} | sed -e 's/,/ /g')
		;;
		nodetect)
			NODETECT=1
		;;
		noload=*)
			MLIST=${x#*=}
			MLIST="$(echo ${MLIST} | sed -e 's/,/ /g')"
			export MLIST
		;;
		CONSOLE=*|console=*)
			CONSOLE=${x#*=}
			CONSOLE=$(basename ${CONSOLE})
		;;
		splash)
			PLYMOUTH=1
		;;
		splash=*)
			FBSPLASH=1
		;;
		lvmraid=*)
			RAID_DEVICES="${x#*=}"
			RAID_DEVICES="$(echo ${RAID_DEVICES} | sed -e 's/,/ /g')"
			USE_LVM_NORMAL=1
		;;
		part=*)
			MDPART=${x#*=}
		;;
		part|partitionable)
			MDPART=1
		;;
		ip=*)
			IP=${x#*=}
		;;
		nfsroot=*)
			NFSROOT=${x#*=}
		;;

		iscsi_initiatorname=*)
			ISCSI_INITIATORNAME=${x#*=}
		;;
		iscsi_target=*)
			ISCSI_TARGET=${x#*=}
		;;
		iscsi_tgpt=*)
			ISCSI_TGPT=${x#*=}
		;;
		iscsi_address=*)
			ISCSI_ADDRESS=${x#*=}
		;;
		iscsi_port=*)
			ISCSI_PORT=${x#*=}
		;;
		iscsi_username=*)
			ISCSI_USERNAME=${x#*=}
		;;
		iscsi_password=*)
			ISCSI_PASSWORD=${x#*=}
		;;
		iscsi_username_in=*)
			ISCSI_USERNAME_IN=${x#*=}
		;;
		iscsi_password_in=*)
			ISCSI_PASSWORD_IN=${x#*=}
		;;
		iscsi_debug=*)
			ISCSI_DEBUG=${x#*=}
		;;
		iscsi_noibft)
			ISCSI_NOIBFT=1
		;;

		crypt_root=*)
			CRYPT_ROOT=${x#*=}
		;;
		crypt_swap=*)
			CRYPT_SWAP=${x#*=}
		;;
		root_key=*)
			CRYPT_ROOT_KEY=${x#*=}
		;;
		root_keydev=*)
			CRYPT_ROOT_KEYDEV=${x#*=}
		;;
		root_trim=*)
			CRYPT_ROOT_TRIM=${x#*=}
		;;

		swap_key=*)
			CRYPT_SWAP_KEY=${x#*=}
		;;
		swap_keydev=*)
			CRYPT_SWAP_KEYDEV=${x#*=}
		;;
		real_resume=*|resume=*)
			REAL_RESUME=${x#*=}
		;;
		noresume)
			NORESUME=1
		;;
		crypt_silent)
			CRYPT_SILENT=1
		;;
		real_rootflags=*)
			REAL_ROOTFLAGS=${x#*=}
		;;
		rootflags=*)
			FAKE_ROOTFLAGS=${x#*=}
		;;
		rootfstype=*)
			ROOTFSTYPE=${x#*=}
		;;
		keymap=*)
			keymap=${x#*=}
		;;
		aufs)
			USE_AUFS_NORMAL=1
		;;
	esac
done

quiet_kmsg

setup_real_root

zfs_init

cmdline_hwopts

mount_devfs

mount_sysfs

devmgr_init

splash_init

modules_init

# Apply scan delay if specified
sdelay

# If we're mdev, we better wait for all the modules to be loaded.
is_mdev && splashcmd init

cd /

start_iscsi

# Setup btrfs, see bug 303529
setup_btrfsctl

# Setup md device nodes if they dont exist
is_mdev && setup_md_device

start_volumes

setup_keymap

# Initialize LUKS root device except for livecd's
is_livecd || start_luks

# Initialize resume from hibernation
is_livecd || resume_init

mkdir -p "${NEW_ROOT}"
CHROOT="${NEW_ROOT}"

# Run debug shell if requested
rundebugshell "before setting up the root filesystem"

# Setup Live system mounts
is_livecd && livecd_init

# Determine root device
good_msg 'Determining root device...'
while true
do
	while [ "${got_good_root}" != '1' ]
	do
		case "${REAL_ROOT}" in
			LABEL=*|UUID=*)

				ROOT_DEV=""
				retval=1

				if [ ${retval} -ne 0 ]; then
					ROOT_DEV=$(findfs "${REAL_ROOT}" 2>/dev/null)
					retval=$?
				fi

				if [ ${retval} -ne 0 ]; then
					ROOT_DEV=$(busybox findfs "${REAL_ROOT}" 2>/dev/null)
					retval=$?
				fi

				if [ ${retval} -ne 0 ]; then
					ROOT_DEV=$(blkid -o device -l -t "${REAL_ROOT}")
					retval=$?
				fi

				if [ ${retval} -eq 0 ] && [ -n "${ROOT_DEV}" ]; then
					good_msg "Detected real_root=${ROOT_DEV}"
					REAL_ROOT="${ROOT_DEV}"
				else
					prompt_user "REAL_ROOT" "root block device"
					got_good_root=0
					continue
				fi
				;;
			ZFS*)
				if [ "${USE_ZFS}" = '0' ]; then
					prompt_user "REAL_ROOT" "root block device"
					continue
				fi
				ROOT_DEV="${REAL_ROOT#*=}"
				if [ "${ROOT_DEV}" != 'ZFS' ]
				then
					if [ "$(zfs get type -o value -H ${ROOT_DEV})" = 'filesystem' ]
					then
						got_good_root=1;
						REAL_ROOT=${ROOT_DEV}
						ROOTFSTYPE=zfs
					else
						bad_msg "${ROOT_DEV} is not a filesystem"
						prompt_user "REAL_ROOT" "root block device"
						got_good_root=0
						continue
					fi
				else
					BOOTFS=$(/sbin/zpool list -H -o bootfs)
					if [ "${BOOTFS}" != '-' ]
					then

						for i in ${BOOTFS}
						do

							zfs get type ${i} > /dev/null
							retval=$?

							if [ ${retval} -eq 0 ];	then
								got_good_root=1
								REAL_ROOT=${i}
								ROOTFSTYPE=zfs
								break
							fi
						done
					else
						got_good_root=0
					fi

				fi

				if [ ${got_good_root} -ne 1 ]; then
					prompt_user "REAL_ROOT" "root block device"
					got_good_root=0
				fi
				continue
				;;
		esac

		if [ "${REAL_ROOT}" = '' ]
		then
			# No REAL_ROOT determined/specified. Prompt user for root block device.
			prompt_user "REAL_ROOT" "root block device"
			got_good_root=0

		# Check for a block device or /dev/nfs
		elif [ -b "${REAL_ROOT}" ] || [ "${REAL_ROOT}" = "/dev/nfs" ]
		then
			got_good_root=1

		else
			bad_msg "Block device ${REAL_ROOT} is not a valid root device..."
			REAL_ROOT=""
			got_good_root=0
		fi
	done


	if is_livecd && [ "${got_good_root}" = '1' -a "${REAL_ROOT}" != "/dev/nfs" ]
	then
		# CD already mounted; no further checks necessary
		break
	elif [ "${LOOPTYPE}" = "sgimips" ]
	then
		# sgimips mounts the livecd root partition directly
		# there is no isofs filesystem to worry about
		break
	else
		good_msg "Mounting $REAL_ROOT as root..."

		if [ "${ROOTFSTYPE}" = 'zfs' ]
		then
			if [ "$(zfs get -H -o value mountpoint ${REAL_ROOT})" = 'legacy' ]
			then
				MOUNT_STATE=rw
			else
				MOUNT_STATE=rw,zfsutil
			fi
		else
			MOUNT_STATE=ro
		fi

		# Try to mount the device as ${NEW_ROOT}
		if [ "${REAL_ROOT}" = '/dev/nfs' ]; then
			findnfsmount
		else
			# mount ro so fsck doesn't barf later
			if [ "${REAL_ROOTFLAGS}" = '' ]; then
				good_msg "Using mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE}"
				mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE} ${REAL_ROOT} ${NEW_ROOT}
			else
				good_msg "Using mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE},${REAL_ROOTFLAGS}"
				mount -t ${ROOTFSTYPE} -o ${MOUNT_STATE},${REAL_ROOTFLAGS} ${REAL_ROOT} ${NEW_ROOT}
			fi
		fi

		# If mount is successful break out of the loop
		# else not a good root and start over.
		if [ "$?" = '0' ]
		then
			# now that the root filesystem is mounted, before
			# checking the validity of ${NEW_ROOT} and ${REAL_INIT},
			# ensure that ${NEW_ROOT}/etc/initramfs.mounts entries
			# are mounted.
			ensure_initramfs_mounts

			# NFS does not need further checks here.
			if [ "${REAL_ROOT}" = "/dev/nfs" ]; then
				break
			fi

			if [ ! -d "${NEW_ROOT}/dev" ]; then
				_msg="The filesystem ${REAL_ROOT},"
				_msg="${_msg} mounted at ${NEW_ROOT}"
				_msg="${_msg} does not contain /dev"
				_msg="${_msg}, init will likely fail..."
				bad_msg "${_msg}"
			fi
			if [ ! -x "${NEW_ROOT}${REAL_INIT:-/sbin/init}" ]; then
				_msg="The filesystem ${REAL_ROOT},"
				_msg="${_msg} mounted at ${NEW_ROOT}"
				_msg="${_msg} does not contain a valid"
				_msg="${_msg} init=${REAL_INIT}"
				bad_msg "${_msg}"
			fi
			break
		else
			bad_msg "Could not mount specified ROOT, try again"
			got_good_root=0
			REAL_ROOT=''
		fi
	fi
done
# End determine root device

# If CD root is set determine the looptype to boot
if is_livecd
then
	good_msg 'Determining looptype ...'
	cd "${NEW_ROOT}"

	# Find loop and looptype
	[ -z "${LOOP}" ] && find_loop
	[ -z "${LOOPTYPE}" ] && find_looptype

	cache_cd_contents

	# If encrypted, find key and mount, otherwise mount as usual
	if [ -n "${CRYPT_ROOT}" ]
	then
		CRYPT_ROOT_KEY="$(head -n 1 "${CDROOT_PATH}"/${CDROOT_MARKER})"
		CRYPT_ROOT='/dev/loop0'
		good_msg 'You booted an encrypted livecd' "${CRYPT_SILENT}"

		losetup /dev/loop0 "${CDROOT_PATH}/${LOOPEXT}${LOOP}"
		test_success 'Preparing loop filesystem'

		start_luks

		case ${LOOPTYPE} in
			normal)
				MOUNTTYPE="ext2"
				;;
			*)
				MOUNTTYPE="${LOOPTYPE}"
				;;
		esac
		mount -t "${MOUNTTYPE}" -o ro /dev/mapper/root "${NEW_ROOT}/mnt/livecd"
		test_success 'Mount filesystem'
		FS_LOCATION='mnt/livecd'
	# Setup the loopback mounts, if unencrypted
	else
		if [ "${LOOPTYPE}" = 'normal' ]
		then
			good_msg 'Mounting loop filesystem'
			mount -t ext2 -o loop,ro "${CDROOT_PATH}/${LOOPEXT}${LOOP}" "${NEW_ROOT}/mnt/livecd"
			test_success 'Mount filesystem'
			FS_LOCATION='mnt/livecd'
		elif [ "${LOOPTYPE}" = 'squashfs' ]
		then
			if [ "${USE_AUFS_NORMAL}" != '1' ]; then
				good_msg 'Mounting squashfs filesystem'
				_CACHED_SQUASHFS_PATH="${NEW_ROOT}/mnt/${LOOP}"
				_squashfs_path="${CDROOT_PATH}/${LOOPEXT}${LOOP}"  # Default to uncached
				# Upgrade to cached version if possible
				[ "${DO_cache}" -a -f "${_CACHED_SQUASHFS_PATH}" ] \
						&& _squashfs_path=${_CACHED_SQUASHFS_PATH}
				mount -t squashfs -o loop,ro "${_squashfs_path}" "${NEW_ROOT}/mnt/livecd" || {
					bad_msg "Squashfs filesystem could not be mounted, dropping into shell."
					if [ -e /proc/filesystems ]; then
						fgrep -q squashfs /proc/filesystems || \
							bad_msg "HINT: Your kernel does not know filesystem \"squashfs\"."
					fi
					do_rundebugshell
				}
			else
				good_msg 'Mounting squashfs & aufs filesystems'
				setup_squashfs_aufs
				test_success 'Mount filesystem'
			fi
			FS_LOCATION='mnt/livecd'
		elif [ "${LOOPTYPE}" = 'gcloop' ]
		then
			good_msg 'Mounting gcloop filesystem'
			echo ' ' | losetup -E 19 -e ucl-0 -p0 "${NEW_ROOT}/dev/loop0" "${CDROOT_PATH}/${LOOPEXT}${LOOP}"
			test_success 'losetup the loop device'

			mount -t ext2 -o ro "${NEW_ROOT}/dev/loop0" "${NEW_ROOT}/mnt/livecd"
			test_success 'Mount the losetup loop device'
			FS_LOCATION='mnt/livecd'
		elif [ "${LOOPTYPE}" = 'zisofs' ]
		then
			FS_LOCATION="${CDROOT_PATH/\/}/${LOOPEXT}${LOOP}"
		elif [ "${LOOPTYPE}" = 'noloop' ]
		then
			FS_LOCATION="${CDROOT_PATH/\/}"
		elif [ "${LOOPTYPE}" = 'sgimips' ]
		then
			# getdvhoff finds the starting offset (in bytes) of the squashfs
			# partition on the cdrom and returns this offset for losetup
			#
			# All currently supported SGI Systems use SCSI CD-ROMs, so
			# so we know that the CD-ROM is usually going to be /dev/sr0.
			#
			# We use the value given to losetup to set /dev/loop0 to point
			# to the liveCD root partition, and then mount /dev/loop0 as
			# the LiveCD rootfs
			good_msg 'Locating the SGI LiveCD Root Partition'
			echo ' ' | \
				losetup -o $(getdvhoff "${NEW_ROOT}${REAL_ROOT}" 0) \
					"${NEW_ROOT}${CDROOT_DEV}" \
					"${NEW_ROOT}${REAL_ROOT}"
			test_success 'losetup /dev/sr0 /dev/loop0'

			good_msg 'Mounting the Root Partition'
			mount -t squashfs -o ro "${NEW_ROOT}${CDROOT_DEV}" "${NEW_ROOT}/mnt/livecd"
			test_success 'mount /dev/loop0 /'
			FS_LOCATION='mnt/livecd'
		fi
	fi



	# Unpacking additional packages from NFS mount
	# This is useful for adding kernel modules to /lib
	# We do this now, so that additional packages can add whereever they want.
	if [ "${REAL_ROOT}" = '/dev/nfs' ]
	then
		if [ -e "${CDROOT_PATH}/add" ]
		then
				for targz in $(ls ${CDROOT_PATH}/add/*.tar.gz)
				do
					tarname=$(basename ${targz})
					good_msg "Adding additional package ${tarname}"
					(cd ${NEW_ROOT} ; /bin/tar -xzf ${targz})
				done
		fi
	fi


	if [ "${USE_AUFS_NORMAL}" != '1' ]; then

	good_msg "Copying read-write image contents to tmpfs"
	# Copy over stuff that should be writable
	(cd "${NEW_ROOT}/${FS_LOCATION}"; cp -a ${ROOT_TREES} "${NEW_ROOT}") || {
		bad_msg "Copying failed, dropping into a shell."
		do_rundebugshell
	}

	# Now we do the links.
	for x in ${ROOT_LINKS}
	do
		if [ -L "${NEW_ROOT}/${FS_LOCATION}/${x}" ]
		then
			ln -s "$(readlink ${NEW_ROOT}/${FS_LOCATION}/${x})" "${x}" 2>/dev/null
		else
			# List all subdirectories of x
			find "${NEW_ROOT}/${FS_LOCATION}/${x}" -type d 2>/dev/null | while read directory
			do
				# Strip the prefix of the FS_LOCATION
				directory="${directory#${NEW_ROOT}/${FS_LOCATION}/}"

				# Skip this directory if we already linked a parent directory
				if [ "${current_parent}" != '' ]; then
					var=$(echo "${directory}" | grep "^${current_parent}")
					if [ "${var}" != '' ]; then
						continue
					fi
				fi
				# Test if the directory exists already
				if [ -e "/${NEW_ROOT}/${directory}" ]
				then
					# It does exist, link all the individual files
					for file in $(ls /${NEW_ROOT}/${FS_LOCATION}/${directory})
					do
					if [ ! -d "/${NEW_ROOT}/${FS_LOCATION}/${directory}/${file}" ] && [ ! -e "${NEW_ROOT}/${directory}/${file}" ]; then
							ln -s "/${FS_LOCATION}/${directory}/${file}" "${directory}/${file}" 2> /dev/null
						fi
					done
				else
					# It does not exist, make a link to the livecd
					ln -s "/${FS_LOCATION}/${directory}" "${directory}" 2>/dev/null
					current_parent="${directory}"
				fi
			done
		fi
	done

	mkdir initramfs proc tmp sys run 2>/dev/null
	chmod 1777 tmp

	# have handy /mnt/cdrom (CDROOT_PATH) as well
	_new_cdroot="${NEW_ROOT}${CDROOT_PATH}"
	[ ! -d "${_new_cdroot}" ] && mkdir -p "${_new_cdroot}"
	mount --bind "${CDROOT_PATH}" "${_new_cdroot}"

	fi

	# Let Init scripts know that we booted from CD
	export CDBOOT
	CDBOOT=1
fi

# Re-run this here, which makes sure that it at least had a chance
# to be called.
ensure_initramfs_mounts

splashcmd hasroot "${NEW_ROOT}"

# Execute script on the cdrom just before boot to update things if necessary
cdupdate

if [ "${SUBDIR}" != '' -a -e "${CHROOT}/${SUBDIR}" ]
then
	good_msg "Entering ${SUBDIR} to boot"
	CHROOT="${CHROOT}/${SUBDIR}"
fi

verbose_kmsg

good_msg "Booting (initramfs)"

cd "${CHROOT}"
mkdir "${CHROOT}/proc" "${CHROOT}/sys" "${CHROOT}/run" 2>/dev/null

is_udev && udevadm settle

if is_udev
then
	udevadm control --exit || bad_msg "Unable to terminate udevd"
fi

# If devtmpfs is mounted, try move it to the new root
# If that fails, try to unmount all possible mounts of devtmpfs as stuff breaks otherwise
for fs in /run /dev /sys /proc
do
	if grep -qs "$fs" /proc/mounts
	then
		if ! mount --move $fs "${CHROOT}"$fs
		then
			umount $fs || \
			bad_msg "Failed to move and unmount the ramdisk $fs!"
		fi
	fi
done

if [ ! -e "${CHROOT}/dev/console" ] || [ ! -e "${CHROOT}/dev/null" ]
then
	bad_msg "ERROR: your real /dev is missing console and null"
elif [ -e /etc/initrd.splash -a ! -e "${CHROOT}/dev/tty1" ]
then
	bad_msg "ERROR: your real /dev is missing tty1, required for splash"
fi

# Run debug shell if requested
rundebugshell "before entering switch_root"

exec /sbin/switch_root -c "/dev/console" "${CHROOT}" "${REAL_INIT:-/sbin/init}" "${INIT_OPTS}"

# If we get here, something bad has happened
splashcmd verbose

bad_msg "A fatal error has occured since ${REAL_INIT:-/sbin/init} did not"
bad_msg "boot correctly. Trying to open a shell..."

exec /bin/bash
exec /bin/sh
exec /bin/ash
exec /bin/dash
exec sh