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#!/bin/bash
# Command to erase user data file system
# Modified for ubifs, secure boot (no U-Boot access)
MNT_USER="/mnt/user"
OVERLAY="$MNT_USER/overlay"
WORKDIR="$MNT_USER/work"
UPPERDIR="$MNT_USER/upper"
LOWERDIR="/"
USER_ORIG="$UPPERDIR/orig"
USER_PARTITION="ubi0:user-data"
# Erase the file system
DO_ERASE_PERSISTENT="/mnt/user/.persistent/mts_do_erase_persistent"
# Remove files not hidden
DO_CLEAR_PERSISTENT="/mnt/user/.persistent/mts_do_clear_persistent"
pid=$$
prefix="<3>overlayrootfs-generator[${pid}]: "
loginfo() { echo "${prefix}$@" >/dev/kmsg ; }
logpipe() {
OIFS="${IFS}"
IFS=$'\n'
while read ln ; do
echo -n "${prefix}${ln}" >/dev/kmsg
done
IFS="${OIFS}"
}
mnt_user() {
mkdir -p $MNT_USER
mount -t ubifs $USER_PARTITION $MNT_USER
}
fs="/run /dev /proc /sys /sys/kernel/security /dev/shm /dev/pts /run /sys/fs/cgroup /sys/fs/cgroup/unified
/sys/fs/cgroup/systemd /sys/fs/cgroup/devices /sys/fs/cgroup/freezer /sys/fs/cgroup/pids /sys/fs/cgroup/memory
/dev/mqueue /sys/kernel/debug /tmp /sys/fs/fuse/connections /sys/kernel/config /var/volatile"
my_switch_root() {
NEW_ROOT=$1
loginfo mountinfo
mount --make-rprivate /
loginfo "my_switch_root: Mount file systems"
for f in $fs ; do
if [[ -d $NEW_ROOT/$f ]] ; then
loginfo "my_switch_root: mount -o noatime,move --bind $f $NEW_ROOT/$f"
mount -o noatime,move --bind $f $NEW_ROOT/$f
else
# loginfo "my_switch_root: Skipping $NEW_ROOT/$f"
:
fi
done
/sbin/pivot_root $NEW_ROOT $NEW_ROOT/orig
}
do_remove_old() {
shopt -s dotglob
rm -rf $MNT_USER/*.old
shopt -u dotglob
}
# select files for deletion
do_clear_old() {
# when "clear user data" is requested - mark all non-hidden files for deletion
loginfo "Clearing user data. Persistent data will be left "
for FILE_PATH in "$MNT_USER"/*; do
FILE_NAME=$(basename "$FILE_PATH")
# rename all files and folders that exist in /mnt/user
mv "$FILE_PATH" "$MNT_USER/$FILE_NAME.old" 2>&1 | logpipe
done
do_remove_old
rm -f $DO_CLEAR_PERSISTENT
}
# Most efficient way to clear UBIFS file system
do_erase_old() {
loginfo "Erasing user data"
# Sys must be mounted to use ubifs utilities
mount -t sysfs sysfs /sys
ubiattach -m 1 >/dev/null 2>&1 || true
ubinfo -d 0 -N user-data | logpipe
[[ $(ubinfo -d 0 -N user-data | grep 'Volume ID') =~ .*[[:space:]]+([0-9]+) ]]
DEV=/dev/ubi0_"${BASH_REMATCH[1]}"
umount -l $MNT_USER
loginfo "Erase user-data partition $DEV"
# Would be nice if ubiupdatevol took volume names instead of numbers
ubiupdatevol ${DEV} -t 2>&1 | logpipe
mnt_user
}
do_rw_mount() {
loginfo "Starting RW overlayfs"
mount -t tmpfs inittemp /mnt
mnt_user # user_data is now accessible
do_remove_old
if [[ -f $DO_ERASE_PERSISTENT ]] ; then
do_erase_old
elif [[ -f $DO_CLEAR_PERSISTENT ]] ; then
do_clear_old
fi
mkdir -p $UPPERDIR $WORKDIR $OVERLAY $USER_ORIG ${MNT_USER}/.persistent
loginfo "Mounting..."
mount -o noatime,lowerdir=$LOWERDIR,upperdir=$UPPERDIR,workdir=$WORKDIR,rw -t overlay overlay $OVERLAY
loginfo "/proc/mounts:"
cat /proc/mounts | grep overlay | logpipe
mkdir -p ${OVERLAY}/var/persistent
mount --bind ${MNT_USER}/.persistent ${OVERLAY}/var/persistent
loginfo "Switch root to $OVERLAY"
my_switch_root $OVERLAY
cat /proc/mounts | grep overlay | logpipe
mount -o remount,rw /
cat /proc/mounts | grep overlay | logpipe
cat /proc/mounts | grep tmp | logpipe
umount -l /tmp >/dev/null 2>&1
umount -l /var/volatile >/dev/null 2>&1
cgroupmnts=$(sed -r -e 's/[^[:space:]]*[[:space:]]//' -e 's/[[:space:]]+.*//g' /proc/mounts | grep '^/orig')
for mp in ${cgroupmnts} ; do
if [[ $mp != /orig ]] && [[ -d $mp ]] ; then
umount -l $mp >/dev/null 2>&1
fi
done
}
TMP=/var/volatile
# Set the suffix number in /var/oem and /var/config to match root
fix_volume_names() {
if ! [[ $(cat /proc/cmdline) =~ root=ubi0:rootfs([0-9]+) ]] ; then
loginfo "Cannot find root=ubi0:rootfs in /proc/cmdline"
fi
vol_suffix=${BASH_REMATCH[1]}
echo $vol_suffix
sed -r "s/(ubi0:(oem|config))([0-9]*)/\1${vol_suffix}/" /etc/fstab >${TMP}/fstab
if ! cmp ${TMP}/fstab /etc/fstab ; then
loginfo "Updating fstab with new volume names"
cp ${TMP}/fstab /etc/fstab
fi
}
do_start() {
do_rw_mount
fix_volume_names
}
case $1 in
start)
do_start
;;
*)
echo "Usage: $0 {start}"
;;
esac
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