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#!/bin/bash
# Command to erase user data file system
MNT_USER="/mnt/user"
OVERLAY="$MNT_USER/overlay"
WORKDIR="$MNT_USER/work"
UPPERDIR="$MNT_USER/upper"
LOWERDIR="/"
USER_ORIG="$UPPERDIR/orig"
USER_PARTITION="User data"
TABLE=$'\n'"$(cat /proc/mtd)"
# Erase the file system
DO_ERASE_PERSISTENT=$(u-boot printenv erase_persistent_f | cut -d '"' -f2 | grep -Eo '[0-9]+$' || true)
# Remove files not hidden
DO_ERASE_ALL_EXCEPT_PERSISTENT=$(u-boot printenv default_reset_f | cut -d '"' -f2 | grep -Eo '[0-9]+$' || true)
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}"
}
if [[ $TABLE =~ [[:space:]]mtd([[:digit:]]+)[^\"]*\"$USER_PARTITION\" ]] ; then
USER_BDEV=/dev/mtdblock${BASH_REMATCH[1]}
USER_DEV=/dev/mtd${BASH_REMATCH[1]}
else
loginfo "Cannot find a User data partition"
exit 0
fi
fs="/dev /proc /sys /run /var/volatile /dev/pts /sys/kernel/debug /sys/kernel/config"
mnt_user() {
mkdir -p $MNT_USER
mount -t jffs2 $USER_BDEV $MNT_USER
}
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_erase_all_except_persistent() {
# Delete all files and folders except for the "${MNT_USER}/.persistent" directory.
loginfo "Clearing user data. Persistent data will be left "
#UPPERDIR has to be cleared except 'orig' folder
#erasing folders in ${UPPERDIR}
find ${UPPERDIR} -maxdepth 1 -type d | grep "${UPPERDIR}/" | grep -v orig | xargs rm -rf
#erasing rest (files, if they are there) in ${UPPERDIR}
rm ${UPPERDIR}/* >/dev/null 2>&1
}
# Most efficient way to clear UBIFS file system
do_erase_persistent() {
loginfo "Erasing user data"
# Sys must be mounted to use ubifs utilities
mount -t sysfs sysfs /sys
umount -l $MNT_USER
loginfo "Erase user-data partition $USER_DEV"
flash_erase -j ${USER_DEV} 0 0 2>&1 | logpipe
mnt_user
}
do_rw_mount() {
loginfo "Starting RW overlayfs"
mount -t tmpfs inittemp /mnt
mnt_user # user_data is now accessible
if [[ "$DO_ERASE_PERSISTENT" -eq 1 ]] ; then
do_erase_persistent
u-boot setenv default_reset_f
u-boot setenv erase_persistent_f 0
elif [[ "$DO_ERASE_ALL_EXCEPT_PERSISTENT" -eq 1 ]] ; then
do_erase_all_except_persistent
u-boot setenv default_reset_f
fi
mkdir -p $UPPERDIR $WORKDIR $OVERLAY $USER_ORIG ${MNT_USER}/.persistent
loginfo "Mounting..."
mount -o index=off,metacopy=off,noatime,lowerdir=$LOWERDIR,upperdir=$UPPERDIR,workdir=$WORKDIR,rw -t overlay overlay $OVERLAY
loginfo "/proc/mounts:"
cat /proc/mounts | grep overlay | logpipe
loginfo "Switch root to $OVERLAY"
my_switch_root $OVERLAY
mount --bind /orig/mnt/user/.persistent/ /var/persistent
cat /proc/mounts | grep overlay | logpipe
mount -o remount,rw /
cat /proc/mounts | grep overlay | logpipe
cat /proc/mounts | grep tmp | logpipe
umount -l /tmp >/dev/null 2>&1
umount -l /var/volatile >/dev/null 2>&1
cgroupmnts=$(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
}
do_start() {
do_rw_mount
}
case $1 in
start)
do_start
;;
*)
echo "Usage: $0 {start}"
;;
esac
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