package/base-files/files/lib/upgrade/stage2

   1 #!/bin/sh
   2
   3 . /lib/functions.sh
   4 . /lib/functions/system.sh
   5
   6 export IMAGE="$1"
   7 COMMAND="$2"
   8
   9 export INTERACTIVE=0
  10 export VERBOSE=1
  11 export CONFFILES=/tmp/sysupgrade.conffiles
  12
  13 RAMFS_COPY_BIN=         # extra programs for temporary ramfs root
  14 RAMFS_COPY_DATA=        # extra data files
  15
  16 include /lib/upgrade
  17
  18
  19 supivot() { # <new_root> <old_root>
  20         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  21         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  22         /bin/mount -o noatime,move /proc $1/proc && \
  23         pivot_root $1 $1$2 || {
  24                 /bin/umount -l $1 $1
  25                 return 1
  26         }
  27
  28         /bin/mount -o noatime,move $2/sys /sys
  29         /bin/mount -o noatime,move $2/dev /dev
  30         /bin/mount -o noatime,move $2/tmp /tmp
  31         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  32         return 0
  33 }
  34
  35 switch_to_ramfs() {
  36         RAMFS_COPY_LOSETUP="$(command -v losetup)"
  37         RAMFS_COPY_LVM="$(command -v lvm)"
  38
  39         for binary in \
  40                 /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount    \
  41                 pivot_root mount_root reboot sync kill sleep            \
  42                 md5sum hexdump cat zcat dd tar                          \
  43                 ls basename find cp mv rm mkdir rmdir mknod touch chmod \
  44                 '[' printf wc grep awk sed cut                          \
  45                 mtd partx losetup mkfs.ext4 nandwrite flash_erase       \
  46                 ubiupdatevol ubiattach ubiblock ubiformat               \
  47                 ubidetach ubirsvol ubirmvol ubimkvol                    \
  48                 snapshot snapshot_tool date logger                      \
  49                 $RAMFS_COPY_LOSETUP $RAMFS_COPY_LVM                     \
  50                 $RAMFS_COPY_BIN
  51         do
  52                 local file="$(command -v "$binary" 2>/dev/null)"
  53                 [ -n "$file" ] && install_bin "$file"
  54         done
  55         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
  56
  57         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
  58
  59         supivot $RAM_ROOT /mnt || {
  60                 v "Failed to switch over to ramfs. Please reboot."
  61                 exit 1
  62         }
  63
  64         /bin/mount -o remount,ro /mnt
  65         /bin/umount -l /mnt
  66
  67         [ "$RAMFS_COPY_LOSETUP" ] && losetup -D
  68         [ "$RAMFS_COPY_LVM" ] && {
  69                 mkdir -p /tmp/lvm/cache
  70                 $RAMFS_COPY_LVM vgchange -aln --ignorelockingfailure
  71         }
  72
  73         grep /overlay /proc/mounts > /dev/null && {
  74                 /bin/mount -o noatime,remount,ro /overlay
  75                 /bin/umount -l /overlay
  76         }
  77 }
  78
  79 kill_remaining() { # [ <signal> [ <loop> ] ]
  80         local loop_limit=10
  81
  82         local sig="${1:-TERM}"
  83         local loop="${2:-0}"
  84         local run=true
  85         local stat
  86         local proc_ppid=$(cut -d' ' -f4  /proc/$$/stat)
  87
  88         v "Sending $sig to remaining processes ..."
  89
  90         while $run; do
  91                 run=false
  92                 for stat in /proc/[0-9]*/stat; do
  93                         [ -f "$stat" ] || continue
  94
  95                         local pid name state ppid rest
  96                         read pid name state ppid rest < $stat
  97                         name="${name#(}"; name="${name%)}"
  98
  99                         # Skip PID1, our parent, ourself and our children
 100                         [ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
 101
 102                         local cmdline
 103                         read cmdline < /proc/$pid/cmdline
 104
 105                         # Skip kernel threads
 106                         [ -n "$cmdline" ] || continue
 107
 108                         v "Sending signal $sig to $name ($pid)"
 109                         kill -$sig $pid 2>/dev/null
 110
 111                         [ $loop -eq 1 ] && run=true
 112                 done
 113
 114                 let loop_limit--
 115                 [ $loop_limit -eq 0 ] && {
 116                         v "Failed to kill all processes."
 117                         exit 1
 118                 }
 119         done
 120 }
 121
 122 indicate_upgrade
 123
 124 while read -r a b c; do
 125         case "$a" in
 126                 MemT*) mem="$b" ;; esac
 127 done < /proc/meminfo
 128
 129 [ "$mem" -gt 32768 ] && \
 130         skip_services="dnsmasq log network"
 131 for service in /etc/init.d/*; do
 132         service=${service##*/}
 133
 134         case " $skip_services " in
 135                 *" $service "*) continue ;; esac
 136
 137         ubus call service delete '{ "name": "'"$service"'" }' 2>/dev/null
 138 done
 139
 140 killall -9 telnetd
 141 killall -9 dropbear
 142 killall -9 ash
 143
 144 kill_remaining TERM
 145 sleep 4
 146 kill_remaining KILL 1
 147
 148 sleep 6
 149
 150 echo 3 > /proc/sys/vm/drop_caches
 151
 152 if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
 153         platform_pre_upgrade "$IMAGE"
 154 fi
 155
 156 if [ -n "$(rootfs_type)" ]; then
 157         v "Switching to ramdisk..."
 158         switch_to_ramfs
 159 fi
 160
 161 # Exec new shell from ramfs
 162 exec /bin/busybox ash -c "$COMMAND"