package/base-files/files/lib/upgrade/common.sh

   1 #!/bin/sh
   2
   3 RAM_ROOT=/tmp/root
   4
   5 ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
   6 libs() { ldd $* | awk '{print $3}'; }
   7
   8 install_file() { # <file> [ <file> ... ]
   9         for file in "$@"; do
  10                 dest="$RAM_ROOT/$file"
  11                 [ -f $file -a ! -f $dest ] && {
  12                         dir="$(dirname $dest)"
  13                         mkdir -p "$dir"
  14                         cp $file $dest
  15                 }
  16         done
  17 }
  18
  19 install_bin() { # <file> [ <symlink> ... ]
  20         src=$1
  21         files=$1
  22         [ -x "$src" ] && files="$src $(libs $src)"
  23         install_file $files
  24         [ -e /lib/ld.so.1 ] && {
  25                 install_file /lib/ld.so.1
  26         }
  27         shift
  28         for link in "$@"; do {
  29                 dest="$RAM_ROOT/$link"
  30                 dir="$(dirname $dest)"
  31                 mkdir -p "$dir"
  32                 [ -f "$dest" ] || ln -s $src $dest
  33         }; done
  34 }
  35
  36 supivot() { # <new_root> <old_root>
  37         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  38         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  39         /bin/mount -o noatime,move /proc $1/proc && \
  40         pivot_root $1 $1$2 || {
  41                 /bin/umount -l $1 $1
  42                 return 1
  43         }
  44
  45         /bin/mount -o noatime,move $2/sys /sys
  46         /bin/mount -o noatime,move $2/dev /dev
  47         /bin/mount -o noatime,move $2/tmp /tmp
  48         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  49         return 0
  50 }
  51
  52 run_ramfs() { # <command> [...]
  53         install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount        \
  54                 /sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd   \
  55                 /bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \
  56                 /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump          \
  57                 /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc
  58
  59         install_bin /sbin/mtd
  60         install_bin /sbin/fs-state
  61         install_bin /sbin/snapshot
  62         for file in $RAMFS_COPY_BIN; do
  63                 install_bin $file
  64         done
  65         install_file /etc/resolv.conf /lib/functions.sh /lib/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
  66
  67         supivot $RAM_ROOT /mnt || {
  68                 echo "Failed to switch over to ramfs. Please reboot."
  69                 exit 1
  70         }
  71
  72         /bin/mount -o remount,ro /mnt
  73         /bin/umount -l /mnt
  74
  75         grep /overlay /proc/mounts > /dev/null && {
  76                 /bin/mount -o noatime,remount,ro /overlay
  77                 /bin/umount -l /overlay
  78         }
  79
  80         # spawn a new shell from ramdisk to reduce the probability of cache issues
  81         exec /bin/busybox ash -c "$*"
  82 }
  83
  84 kill_remaining() { # [ <signal> ]
  85         local sig="${1:-TERM}"
  86         echo -n "Sending $sig to remaining processes ... "
  87
  88         local stat
  89         for stat in /proc/[0-9]*/stat; do
  90                 [ -f "$stat" ] || continue
  91
  92                 local pid name state ppid rest
  93                 read pid name state ppid rest < $stat
  94                 name="${name#(}"; name="${name%)}"
  95
  96                 local cmdline
  97                 read cmdline < /proc/$pid/cmdline
  98
  99                 # Skip kernel threads
 100                 [ -n "$cmdline" ] || continue
 101
 102                 case "$name" in
 103                         # Skip essential services
 104                         *procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;
 105
 106                         # Killable process
 107                         *)
 108                                 if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
 109                                         echo -n "$name "
 110                                         kill -$sig $pid 2>/dev/null
 111                                 fi
 112                         ;;
 113                 esac
 114         done
 115         echo ""
 116 }
 117
 118 run_hooks() {
 119         local arg="$1"; shift
 120         for func in "$@"; do
 121                 eval "$func $arg"
 122         done
 123 }
 124
 125 ask_bool() {
 126         local default="$1"; shift;
 127         local answer="$default"
 128
 129         [ "$INTERACTIVE" -eq 1 ] && {
 130                 case "$default" in
 131                         0) echo -n "$* (y/N): ";;
 132                         *) echo -n "$* (Y/n): ";;
 133                 esac
 134                 read answer
 135                 case "$answer" in
 136                         y*) answer=1;;
 137                         n*) answer=0;;
 138                         *) answer="$default";;
 139                 esac
 140         }
 141         [ "$answer" -gt 0 ]
 142 }
 143
 144 v() {
 145         [ "$VERBOSE" -ge 1 ] && echo "$@"
 146 }
 147
 148 rootfs_type() {
 149         /bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 150 }
 151
 152 get_image() { # <source> [ <command> ]
 153         local from="$1"
 154         local conc="$2"
 155         local cmd
 156
 157         case "$from" in
 158                 http://*|ftp://*) cmd="wget -O- -q";;
 159                 *) cmd="cat";;
 160         esac
 161         if [ -z "$conc" ]; then
 162                 local magic="$(eval $cmd $from 2>/dev/null | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 163                 case "$magic" in
 164                         1f8b) conc="zcat";;
 165                         425a) conc="bzcat";;
 166                 esac
 167         fi
 168
 169         eval "$cmd $from 2>/dev/null ${conc:+| $conc}"
 170 }
 171
 172 get_magic_word() {
 173         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
 174 }
 175
 176 get_magic_long() {
 177         get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 178 }
 179
 180 jffs2_copy_config() {
 181         if grep rootfs_data /proc/mtd >/dev/null; then
 182                 # squashfs+jffs2
 183                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 184         else
 185                 # jffs2
 186                 mtd jffs2write "$CONF_TAR" rootfs
 187         fi
 188 }
 189
 190 default_do_upgrade() {
 191         sync
 192         if [ "$SAVE_CONFIG" -eq 1 ]; then
 193                 get_image "$1" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
 194         else
 195                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 196         fi
 197 }
 198
 199 do_upgrade() {
 200         v "Performing system upgrade..."
 201         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 202                 platform_do_upgrade "$ARGV"
 203         else
 204                 default_do_upgrade "$ARGV"
 205         fi
 206
 207         if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
 208                 platform_copy_config
 209         fi
 210
 211         v "Upgrade completed"
 212         [ -n "$DELAY" ] && sleep "$DELAY"
 213         ask_bool 1 "Reboot" && {
 214                 v "Rebooting system..."
 215                 reboot -f
 216                 sleep 5
 217                 echo b 2>/dev/null >/proc/sysrq-trigger
 218         }
 219 }