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="$2"
   8
   9 export SAVE_CONFIG=1
  10 export SAVE_PARTITIONS=1
  11
  12 export INTERACTIVE=0
  13 export VERBOSE=1
  14 export CONFFILES=/tmp/sysupgrade.conffiles
  15 export CONF_TAR=/tmp/sysupgrade.tgz
  16
  17 RAMFS_COPY_BIN=         # extra programs for temporary ramfs root
  18 RAMFS_COPY_DATA=        # extra data files
  19
  20
  21 [ -f "$CONF_TAR" ] || export SAVE_CONFIG=0
  22 [ -f /tmp/sysupgrade.always.overwrite.bootdisk.partmap ] && export SAVE_PARTITIONS=0
  23
  24 include /lib/upgrade
  25
  26
  27 supivot() { # <new_root> <old_root>
  28         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  29         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  30         /bin/mount -o noatime,move /proc $1/proc && \
  31         pivot_root $1 $1$2 || {
  32                 /bin/umount -l $1 $1
  33                 return 1
  34         }
  35
  36         /bin/mount -o noatime,move $2/sys /sys
  37         /bin/mount -o noatime,move $2/dev /dev
  38         /bin/mount -o noatime,move $2/tmp /tmp
  39         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  40         return 0
  41 }
  42
  43 switch_to_ramfs() {
  44         for binary in \
  45                 /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount    \
  46                 pivot_root mount_root reboot sync kill sleep            \
  47                 md5sum hexdump cat zcat bzcat dd tar                    \
  48                 ls basename find cp mv rm mkdir rmdir mknod touch chmod \
  49                 '[' printf wc grep awk sed cut                          \
  50                 mtd partx losetup mkfs.ext4                             \
  51                 ubiupdatevol ubiattach ubiblock ubiformat               \
  52                 ubidetach ubirsvol ubirmvol ubimkvol                    \
  53                 snapshot snapshot_tool                                  \
  54                 $RAMFS_COPY_BIN
  55         do
  56                 local file="$(which "$binary" 2>/dev/null)"
  57                 [ -n "$file" ] && install_bin "$file"
  58         done
  59         install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh /lib/upgrade/do_stage2 $RAMFS_COPY_DATA
  60
  61         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
  62
  63         supivot $RAM_ROOT /mnt || {
  64                 echo "Failed to switch over to ramfs. Please reboot."
  65                 exit 1
  66         }
  67
  68         /bin/mount -o remount,ro /mnt
  69         /bin/umount -l /mnt
  70
  71         grep /overlay /proc/mounts > /dev/null && {
  72                 /bin/mount -o noatime,remount,ro /overlay
  73                 /bin/umount -l /overlay
  74         }
  75 }
  76
  77 kill_remaining() { # [ <signal> [ <loop> ] ]
  78         local loop_limit=10
  79
  80         local sig="${1:-TERM}"
  81         local loop="${2:-0}"
  82         local run=true
  83         local stat
  84         local proc_ppid=$(cut -d' ' -f4  /proc/$$/stat)
  85
  86         echo -n "Sending $sig to remaining processes ... "
  87
  88         while $run; do
  89                 run=false
  90                 for stat in /proc/[0-9]*/stat; do
  91                         [ -f "$stat" ] || continue
  92
  93                         local pid name state ppid rest
  94                         read pid name state ppid rest < $stat
  95                         name="${name#(}"; name="${name%)}"
  96
  97                         # Skip PID1, our parent, ourself and our children
  98                         [ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
  99
 100                         local cmdline
 101                         read cmdline < /proc/$pid/cmdline
 102
 103                         # Skip kernel threads
 104                         [ -n "$cmdline" ] || continue
 105
 106                         echo -n "$name "
 107                         kill -$sig $pid 2>/dev/null
 108
 109                         [ $loop -eq 1 ] && run=true
 110                 done
 111
 112                 let loop_limit--
 113                 [ $loop_limit -eq 0 ] && {
 114                         echo
 115                         echo "Failed to kill all processes."
 116                         exit 1
 117                 }
 118         done
 119         echo
 120 }
 121
 122 indicate_upgrade
 123
 124 killall -9 telnetd
 125 killall -9 dropbear
 126 killall -9 ash
 127
 128 kill_remaining TERM
 129 sleep 3
 130 kill_remaining KILL 1
 131
 132 sleep 1
 133
 134
 135 if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
 136         platform_pre_upgrade "$IMAGE"
 137 fi
 138
 139 if [ -n "$(rootfs_type)" ]; then
 140         echo "Switching to ramdisk..."
 141         switch_to_ramfs
 142 fi
 143
 144 # Exec new shell from ramfs
 145 exec /bin/busybox ash -c "$COMMAND"