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init.d_autoexpand_root-4
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init.d_autoexpand_root-4
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#!/sbin/openrc-run
#
# Automatically attempt to extend root partition (calculated from
# the root=... kernel command line parameter, with root=PARTUUID=... allowed)
# to fill remaining free space on the card
#
# Operates on a live root filesystem: first pass will simply expand the
# partition, then reboot (as it is not possible to change the kernel partition
# table entry for / on a running system); on the second pass, we resize the
# root filesystem (this can be done 'live'), then add xdm to the default
# runlevel, and start it (to bring up the Xfce4 demouser session).
#
# Checks for a sentinel file "autoexpand_root_partition" on /boot (the
# microSD card's first partition), and will proceed only if found. On first
# run, it is replaced with the file "autoexpand_root_filesystem" (and on
# second run, this latter sentinel file is deleted).
#
# On first run, the root and demouser password will also be set, to
# "raspberrypi64"; if you _only_ want to do this (and not extend the root
# partition) then create an "autoexpand_root_none" sentinel file on /boot (in
# place of "autoexpand_root_partition"). For avoidance of doubt, doing so
# will still enable Xfce4, and start the demouser session.
#
# Copyright (c) 2017 sakaki <sakaki@deciban.com>
# License: GPL 3.0+
# NO WARRANTY
description="Auto-expands root partition and sets passwords (for gentoo-on-rpi3-64bit)"
depend() {
need localmount
after modules sysctl root
}
SENTINEL1="/boot/autoexpand_root_partition"
SENTINEL2="/boot/autoexpand_root_filesystem"
SENTINEL3="/boot/autoexpand_root_none"
DEFAULTPW="raspberrypi64"
_resize_if_necessary() {
local PUUID="" KROOTPART="" ROOTDRIVE="" ROOTPART="" PNUM=""
if [[ -f "${SENTINEL1}" || -f "${SENTINEL2}" ]]; then
# begin by finding the specified root from the kernel command line
KROOTPART="$(awk -v RS=" " '/^root=/ {print substr($0,6)}' /proc/cmdline)"
if [[ -z "${KROOTPART}" ]]; then
eerror "Could not find root=<...> term in kernel command line"
return 1
fi
# if a PARTUUID spec, look it up
if grep -q "PARTUUID=" <<<"${KROOTPART}"; then
PUUID="$(cut -d '=' -f 2 <<<"${KROOTPART}" )"
# make sure lower case
PUUID="${PUUID,,}"
if ! ROOTPART="$(findfs PARTUUID=${PUUID})"; then
eerror "Failed to locate root on PARTUUID ${PUUID}"
return 1
fi
else
# otherwise, just take it as is
ROOTPART="${KROOTPART}"
fi
# extract the drive from the partition name, e.g.
# /dev/sda2 -> /dev/sda
# /dev/mmcblk0p2 -> /dev/mmcblk0
ROOTDRIVE="$(sed 's/[0-9]*$//;s/\([0-9]\)p$/\1/' <<<"${ROOTPART}")"
# get the partition number too
PNUM="$(egrep -o "[0-9]+$" <<<"${ROOTPART}")"
if [[ -z "${ROOTPART}" || -z "${ROOTDRIVE}" || -z "${PNUM}" ]]; then
eerror "Unable to determine root path components"
return 1
fi
fi
if [ -f "${SENTINEL1}" ]; then
# first boot, need to resize root partition to fill disk
# then, since this is /, need to reboot to get kernel to see it
# after which its ext4 filesystem can be resized online
ewarn ""
ewarn "*******************************************************************"
ewarn "* Auto resizing root partition to fill microSD card - please wait *"
ewarn "* (we will reboot immediately this is done, so kernel notices) *"
ewarn "*******************************************************************"
ewarn ""
rm -f "${SENTINEL1}"
if [ -f "${SENTINEL1}" ]; then
# might mean an ro filesystem, and we don't want an
# infinite loop
eerror "Failed to delete sentinel file '${SENTINEL1}'"
return 1
fi
# turn off swapfiles, for safety
swapoff -a
# sync filesystems before we begin, to minimize any damage if things
# should go wrong
sync
# begin by resizing the root partition
if ! sfdisk --no-reread --no-tell-kernel -N ${PNUM} <<<", +" "${ROOTDRIVE}" &>/dev/null; then
eerror "Failed to resize root partition"
return 1
fi
# create second sentinel to mark that we have done this
touch "${SENTINEL2}"
if ! [ -f "${SENTINEL2}" ]; then
eerror "Failed to create sentinel file '${SENTINEL2}'"
return 1
fi
# now, change passwords
ewarn "Changing root and demouser passwords, to '${DEFAULTPW}'"
chpasswd <<<"root:${DEFAULTPW}" &>/dev/null
chpasswd <<<"demouser:${DEFAULTPW}" &>/dev/null
ewarn ""
ewarn "*******************************************************************"
ewarn "* Resize completed - rebooting now (this will only happen once) *"
ewarn "*******************************************************************"
ewarn ""
# let the user read it
sleep 5
# then reboot, but don't do it in the context of this, an init script
sync
nohup bash -c 'reboot' &>/dev/null&
elif [ -f "${SENTINEL2}" ]; then
# second boot, partition has been resized (and kernel is aware); so now
# we just need to update the filesystem, which can be done online
ewarn ""
ewarn "*******************************************************************"
ewarn "* Auto resizing root filesystem to fill partition ${PNUM} - please wait *"
ewarn "*******************************************************************"
ewarn ""
rm -f "${SENTINEL2}"
if [ -f "${SENTINEL2}" ]; then
eerror "Failed to delete sentinel file '${SENTINEL2}'"
return 1
fi
# turn off swapfiles, for safety
swapoff -a
# sync filesystems before we begin, to minimize any damage if things
# should go wrong
sync
# do an online resize of the root partition's ext4 filing system
if ! resize2fs -f "${ROOTPART}" &>/dev/null; then
eerror "Failed to resize root filesystem"
return 1
fi
# restore swaps
swapon -a
ewarn ""
ewarn "*******************************************************************"
ewarn "* Root filesystem resized OK - proceeding with boot! *"
ewarn "*******************************************************************"
ewarn ""
# let the user read it
sleep 5
# then ensure we don't run again, and that graphical login
# starts up (disabled by default on the image)
sync
rc-update del "${SVCNAME}" boot &>/dev/null
rc-update add xdm default &>/dev/null
rc-update --update &>/dev/null
elif [ -f "${SENTINEL3}" ]; then
# First boot, with no resizing requested.
# we just need to update the passwords and logon
rm -f "${SENTINEL3}"
if [ -f "${SENTINEL3}" ]; then
eerror "Failed to delete sentinel file '${SENTINEL3}'"
return 1
fi
# Change passwords
ewarn "Changing root and demouser passwords, to '${DEFAULTPW}'"
chpasswd <<<"root:${DEFAULTPW}" &>/dev/null
chpasswd <<<"demouser:${DEFAULTPW}" &>/dev/null
ewarn ""
ewarn "*******************************************************************"
ewarn "* Changed passwords - proceeding with boot! *"
ewarn "*******************************************************************"
ewarn ""
# let the user read it
sleep 5
# then ensure we don't run again, and that graphical login
# starts up (disabled by default on the image)
sync
rc-update del "${SVCNAME}" boot &>/dev/null
rc-update add xdm default &>/dev/null
rc-update --update &>/dev/null
else
# no sentinel found, service should really be disabled
ewarn "No sentinel detected; consider deleting ${SVCNAME} from boot runlevel"
fi
return 0
}
start() {
ebegin "Starting ${SVCNAME}"
_resize_if_necessary
eend $?
}