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 export CONF_TAR=/tmp/sysupgrade.tgz
  13
  14 RAMFS_COPY_BIN=         # extra programs for temporary ramfs root
  15 RAMFS_COPY_DATA=        # extra data files
  16
  17 include /lib/upgrade
  18
  19
  20 supivot() { # <new_root> <old_root>
  21         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  22         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  23         /bin/mount -o noatime,move /proc $1/proc && \
  24         pivot_root $1 $1$2 || {
  25                 /bin/umount -l $1 $1
  26                 return 1
  27         }
  28
  29         /bin/mount -o noatime,move $2/sys /sys
  30         /bin/mount -o noatime,move $2/dev /dev
  31         /bin/mount -o noatime,move $2/tmp /tmp
  32         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  33         return 0
  34 }
  35
  36 switch_to_ramfs() {
  37         for binary in \
  38                 /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount    \
  39                 pivot_root mount_root reboot sync kill sleep            \
  40                 md5sum hexdump cat zcat bzcat dd tar                    \
  41                 ls basename find cp mv rm mkdir rmdir mknod touch chmod \
  42                 '[' printf wc grep awk sed cut                          \
  43                 mtd partx losetup mkfs.ext4                             \
  44                 ubiupdatevol ubiattach ubiblock ubiformat               \
  45                 ubidetach ubirsvol ubirmvol ubimkvol                    \
  46                 snapshot snapshot_tool                                  \
  47                 $RAMFS_COPY_BIN
  48         do
  49                 local file="$(which "$binary" 2>/dev/null)"
  50                 [ -n "$file" ] && install_bin "$file"
  51         done
  52         install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh /lib/upgrade/do_stage2 $RAMFS_COPY_DATA
  53
  54         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
  55
  56         supivot $RAM_ROOT /mnt || {
  57                 echo "Failed to switch over to ramfs. Please reboot."
  58                 exit 1
  59         }
  60
  61         /bin/mount -o remount,ro /mnt
  62         /bin/umount -l /mnt
  63
  64         grep /overlay /proc/mounts > /dev/null && {
  65                 /bin/mount -o noatime,remount,ro /overlay
  66                 /bin/umount -l /overlay
  67         }
  68 }
  69
  70 kill_remaining() { # [ <signal> [ <loop> ] ]
  71         local loop_limit=10
  72
  73         local sig="${1:-TERM}"
  74         local loop="${2:-0}"
  75         local run=true
  76         local stat
  77         local proc_ppid=$(cut -d' ' -f4  /proc/$$/stat)
  78
  79         echo -n "Sending $sig to remaining processes ... "
  80
  81         while $run; do
  82                 run=false
  83                 for stat in /proc/[0-9]*/stat; do
  84                         [ -f "$stat" ] || continue
  85
  86                         local pid name state ppid rest
  87                         read pid name state ppid rest < $stat
  88                         name="${name#(}"; name="${name%)}"
  89
  90                         # Skip PID1, our parent, ourself and our children
  91                         [ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
  92
  93                         local cmdline
  94                         read cmdline < /proc/$pid/cmdline
  95
  96                         # Skip kernel threads
  97                         [ -n "$cmdline" ] || continue
  98
  99                         echo -n "$name "
 100                         kill -$sig $pid 2>/dev/null
 101
 102                         [ $loop -eq 1 ] && run=true
 103                 done
 104
 105                 let loop_limit--
 106                 [ $loop_limit -eq 0 ] && {
 107                         echo
 108                         echo "Failed to kill all processes."
 109                         exit 1
 110                 }
 111         done
 112         echo
 113 }
 114
 115 indicate_upgrade
 116
 117 killall -9 telnetd
 118 killall -9 dropbear
 119 killall -9 ash
 120
 121 kill_remaining TERM
 122 sleep 3
 123 kill_remaining KILL 1
 124
 125 sleep 1
 126
 127
 128 if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
 129         platform_pre_upgrade "$IMAGE"
 130 fi
 131
 132 if [ -n "$(rootfs_type)" ]; then
 133         echo "Switching to ramdisk..."
 134         switch_to_ramfs
 135 fi
 136
 137 # Exec new shell from ramfs
 138 exec /bin/busybox ash -c "$COMMAND"