blob: f2f3cd439a747e80da9f7c22d75325983eb9868b (
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
#!/bin/sh
. /lib/functions.sh
. /lib/functions/system.sh
export IMAGE="$1"
COMMAND="$2"
export INTERACTIVE=0
export VERBOSE=1
export CONFFILES=/tmp/sysupgrade.conffiles
RAMFS_COPY_BIN= # extra programs for temporary ramfs root
RAMFS_COPY_DATA= # extra data files
include /lib/upgrade
supivot() { # <new_root> <old_root>
/bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
/bin/mount -o noatime,move /proc $1/proc && \
pivot_root $1 $1$2 || {
/bin/umount -l $1 $1
return 1
}
/bin/mount -o noatime,move $2/sys /sys
/bin/mount -o noatime,move $2/dev /dev
/bin/mount -o noatime,move $2/tmp /tmp
/bin/mount -o noatime,move $2/overlay /overlay 2>&-
return 0
}
switch_to_ramfs() {
RAMFS_COPY_LOSETUP="$(command -v losetup)"
RAMFS_COPY_LVM="$(command -v lvm)"
for binary in \
/bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount \
pivot_root mount_root reboot sync kill sleep \
md5sum hexdump cat zcat dd tar \
ls basename find cp mv rm mkdir rmdir mknod touch chmod \
'[' printf wc grep awk sed cut \
mtd partx losetup mkfs.ext4 nandwrite flash_erase \
ubiupdatevol ubiattach ubiblock ubiformat \
ubidetach ubirsvol ubirmvol ubimkvol \
snapshot snapshot_tool date logger \
$RAMFS_COPY_LOSETUP $RAMFS_COPY_LVM \
$RAMFS_COPY_BIN
do
local file="$(command -v "$binary" 2>/dev/null)"
[ -n "$file" ] && install_bin "$file"
done
install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh /lib/upgrade/do_stage2 /usr/share/libubox/jshn.sh $RAMFS_COPY_DATA
[ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
supivot $RAM_ROOT /mnt || {
v "Failed to switch over to ramfs. Please reboot."
exit 1
}
/bin/mount -o remount,ro /mnt
/bin/umount -l /mnt
[ "$RAMFS_COPY_LOSETUP" ] && losetup -D
[ "$RAMFS_COPY_LVM" ] && {
mkdir -p /tmp/lvm/cache
$RAMFS_COPY_LVM vgchange -aln --ignorelockingfailure
}
grep /overlay /proc/mounts > /dev/null && {
/bin/mount -o noatime,remount,ro /overlay
/bin/umount -l /overlay
}
}
kill_remaining() { # [ <signal> [ <loop> ] ]
local loop_limit=10
local sig="${1:-TERM}"
local loop="${2:-0}"
local run=true
local stat
local proc_ppid=$(cut -d' ' -f4 /proc/$$/stat)
v "Sending $sig to remaining processes ..."
while $run; do
run=false
for stat in /proc/[0-9]*/stat; do
[ -f "$stat" ] || continue
local pid name state ppid rest
read pid name state ppid rest < $stat
name="${name#(}"; name="${name%)}"
# Skip PID1, our parent, ourself and our children
[ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
local cmdline
read cmdline < /proc/$pid/cmdline
# Skip kernel threads
[ -n "$cmdline" ] || continue
v "Sending signal $sig to $name ($pid)"
kill -$sig $pid 2>/dev/null
[ $loop -eq 1 ] && run=true
done
let loop_limit--
[ $loop_limit -eq 0 ] && {
v "Failed to kill all processes."
exit 1
}
done
}
indicate_upgrade
while read -r a b c; do
case "$a" in
MemT*) mem="$b" ;; esac
done < /proc/meminfo
[ "$mem" -gt 32768 ] && \
skip_services="dnsmasq log network"
for service in /etc/init.d/*; do
service=${service##*/}
case " $skip_services " in
*" $service "*) continue ;; esac
ubus call service delete '{ "name": "'"$service"'" }' 2>/dev/null
done
killall -9 telnetd
killall -9 dropbear
killall -9 ash
kill_remaining TERM
sleep 4
kill_remaining KILL 1
sleep 6
echo 3 > /proc/sys/vm/drop_caches
if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
platform_pre_upgrade "$IMAGE"
fi
if [ -n "$(rootfs_type)" ]; then
v "Switching to ramdisk..."
switch_to_ramfs
fi
# Exec new shell from ramfs
exec /bin/busybox ash -c "$COMMAND"
|
