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 SAVE_PARTITIONS=1
  10
  11 export INTERACTIVE=0
  12 export VERBOSE=1
  13 export CONFFILES=/tmp/sysupgrade.conffiles
  14 export CONF_TAR=/tmp/sysupgrade.tgz
  15
  16 RAMFS_COPY_BIN=         # extra programs for temporary ramfs root
  17 RAMFS_COPY_DATA=        # extra data files
  18
  19
  20 [ -f /tmp/sysupgrade.always.overwrite.bootdisk.partmap ] && export SAVE_PARTITIONS=0
  21
  22 include /lib/upgrade
  23
  24
  25 supivot() { # <new_root> <old_root>
  26         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  27         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  28         /bin/mount -o noatime,move /proc $1/proc && \
  29         pivot_root $1 $1$2 || {
  30                 /bin/umount -l $1 $1
  31                 return 1
  32         }
  33
  34         /bin/mount -o noatime,move $2/sys /sys
  35         /bin/mount -o noatime,move $2/dev /dev
  36         /bin/mount -o noatime,move $2/tmp /tmp
  37         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  38         return 0
  39 }
  40
  41 switch_to_ramfs() {
  42         for binary in \
  43                 /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount    \
  44                 pivot_root mount_root reboot sync kill sleep            \
  45                 md5sum hexdump cat zcat bzcat dd tar                    \
  46                 ls basename find cp mv rm mkdir rmdir mknod touch chmod \
  47                 '[' printf wc grep awk sed cut                          \
  48                 mtd partx losetup mkfs.ext4                             \
  49                 ubiupdatevol ubiattach ubiblock ubiformat               \
  50                 ubidetach ubirsvol ubirmvol ubimkvol                    \
  51                 snapshot snapshot_tool                                  \
  52                 $RAMFS_COPY_BIN
  53         do
  54                 local file="$(which "$binary" 2>/dev/null)"
  55                 [ -n "$file" ] && install_bin "$file"
  56         done
  57         install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh /lib/upgrade/do_stage2 $RAMFS_COPY_DATA
  58
  59         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
  60
  61         supivot $RAM_ROOT /mnt || {
  62                 echo "Failed to switch over to ramfs. Please reboot."
  63                 exit 1
  64         }
  65
  66         /bin/mount -o remount,ro /mnt
  67         /bin/umount -l /mnt
  68
  69         grep /overlay /proc/mounts > /dev/null && {
  70                 /bin/mount -o noatime,remount,ro /overlay
  71                 /bin/umount -l /overlay
  72         }
  73 }
  74
  75 kill_remaining() { # [ <signal> [ <loop> ] ]
  76         local loop_limit=10
  77
  78         local sig="${1:-TERM}"
  79         local loop="${2:-0}"
  80         local run=true
  81         local stat
  82         local proc_ppid=$(cut -d' ' -f4  /proc/$$/stat)
  83
  84         echo -n "Sending $sig to remaining processes ... "
  85
  86         while $run; do
  87                 run=false
  88                 for stat in /proc/[0-9]*/stat; do
  89                         [ -f "$stat" ] || continue
  90
  91                         local pid name state ppid rest
  92                         read pid name state ppid rest < $stat
  93                         name="${name#(}"; name="${name%)}"
  94
  95                         # Skip PID1, our parent, ourself and our children
  96                         [ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
  97
  98                         local cmdline
  99                         read cmdline < /proc/$pid/cmdline
 100
 101                         # Skip kernel threads
 102                         [ -n "$cmdline" ] || continue
 103
 104                         echo -n "$name "
 105                         kill -$sig $pid 2>/dev/null
 106
 107                         [ $loop -eq 1 ] && run=true
 108                 done
 109
 110                 let loop_limit--
 111                 [ $loop_limit -eq 0 ] && {
 112                         echo
 113                         echo "Failed to kill all processes."
 114                         exit 1
 115                 }
 116         done
 117         echo
 118 }
 119
 120 indicate_upgrade
 121
 122 killall -9 telnetd
 123 killall -9 dropbear
 124 killall -9 ash
 125
 126 kill_remaining TERM
 127 sleep 3
 128 kill_remaining KILL 1
 129
 130 sleep 1
 131
 132
 133 if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
 134         platform_pre_upgrade "$IMAGE"
 135 fi
 136
 137 if [ -n "$(rootfs_type)" ]; then
 138         echo "Switching to ramdisk..."
 139         switch_to_ramfs
 140 fi
 141
 142 # Exec new shell from ramfs
 143 exec /bin/busybox ash -c "$COMMAND"