blob: f19abef900c71e3b4d983d960ea23bbee20d8197 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
#!/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=$(fw_printenv default_reset_f | cut -d '"' -f2 | grep -Eo '[0-9]+$' || 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}"
}
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 /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
fw_setenv default_reset_f 0
}
# 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 $DO_ERASE_PERSISTENT ]] ; then
do_erase_old
elif [[ "$DO_CLEAR_PERSISTENT" -eq 1 ]] ; 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 ]] && [[ $mp != /orig/mnt* ]] && [[ -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
|
