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