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

   1 #!/bin/sh
   2
   3 RAM_ROOT=/tmp/root
   4
   5 [ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
   6 libs() { ldd $* | sed -r 's/(.* => )?(.*) .*/\2/'; }
   7
   8 install_file() { # <file> [ <file> ... ]
   9         for file in "$@"; 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 $files
  24         shift
  25         for link in "$@"; do {
  26                 dest="$RAM_ROOT/$link"
  27                 dir="$(dirname $dest)"
  28                 mkdir -p "$dir"
  29                 [ -f "$dest" ] || ln -s $src $dest
  30         }; done
  31 }
  32
  33 supivot() { # <new_root> <old_root>
  34         /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
  35         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  36         /bin/mount -o noatime,move /proc $1/proc && \
  37         pivot_root $1 $1$2 || {
  38                 /bin/umount -l $1 $1
  39                 return 1
  40         }
  41
  42         /bin/mount -o noatime,move $2/sys /sys
  43         /bin/mount -o noatime,move $2/dev /dev
  44         /bin/mount -o noatime,move $2/tmp /tmp
  45         /bin/mount -o noatime,move $2/overlay /overlay 2>&-
  46         return 0
  47 }
  48
  49 run_ramfs() { # <command> [...]
  50         install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount        \
  51                 /sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd   \
  52                 /bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \
  53                 /bin/dd /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump  \
  54                 /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc \
  55                 /bin/cut /usr/bin/printf /bin/sync /bin/mkdir /bin/rmdir        \
  56                 /bin/rm /usr/bin/basename /bin/kill /bin/chmod
  57
  58         install_bin /sbin/mtd
  59         install_bin /sbin/ubi
  60         install_bin /sbin/mount_root
  61         install_bin /sbin/snapshot
  62         install_bin /sbin/snapshot_tool
  63         install_bin /usr/sbin/ubiupdatevol
  64         install_bin /usr/sbin/ubiattach
  65         install_bin /usr/sbin/ubiblock
  66         install_bin /usr/sbin/ubiformat
  67         install_bin /usr/sbin/ubidetach
  68         install_bin /usr/sbin/ubirsvol
  69         install_bin /usr/sbin/ubirmvol
  70         install_bin /usr/sbin/ubimkvol
  71         for file in $RAMFS_COPY_BIN; do
  72                 install_bin ${file//:/ }
  73         done
  74         install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
  75
  76         [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
  77
  78         supivot $RAM_ROOT /mnt || {
  79                 echo "Failed to switch over to ramfs. Please reboot."
  80                 exit 1
  81         }
  82
  83         /bin/mount -o remount,ro /mnt
  84         /bin/umount -l /mnt
  85
  86         grep /overlay /proc/mounts > /dev/null && {
  87                 /bin/mount -o noatime,remount,ro /overlay
  88                 /bin/umount -l /overlay
  89         }
  90
  91         # spawn a new shell from ramdisk to reduce the probability of cache issues
  92         exec /bin/busybox ash -c "$*"
  93 }
  94
  95 kill_remaining() { # [ <signal> ]
  96         local sig="${1:-TERM}"
  97         echo -n "Sending $sig to remaining processes ... "
  98
  99         local my_pid=$$
 100         local my_ppid=$(cut -d' ' -f4  /proc/$my_pid/stat)
 101         local my_ppisupgraded=
 102         grep -q upgraded /proc/$my_ppid/cmdline >/dev/null && {
 103                 local my_ppisupgraded=1
 104         }
 105
 106         local stat
 107         for stat in /proc/[0-9]*/stat; do
 108                 [ -f "$stat" ] || continue
 109
 110                 local pid name state ppid rest
 111                 read pid name state ppid rest < $stat
 112                 name="${name#(}"; name="${name%)}"
 113
 114                 local cmdline
 115                 read cmdline < /proc/$pid/cmdline
 116
 117                 # Skip kernel threads
 118                 [ -n "$cmdline" ] || continue
 119
 120                 if [ $$ -eq 1 ] || [ $my_ppid -eq 1 ] && [ -n "$my_ppisupgraded" ]; then
 121                         # Running as init process, kill everything except me
 122                         if [ $pid -ne $$ ] && [ $pid -ne $my_ppid ]; then
 123                                 echo -n "$name "
 124                                 kill -$sig $pid 2>/dev/null
 125                         fi
 126                 else
 127                         case "$name" in
 128                                 # Skip essential services
 129                                 *procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;
 130
 131                                 # Killable process
 132                                 *)
 133                                         if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
 134                                                 echo -n "$name "
 135                                                 kill -$sig $pid 2>/dev/null
 136                                         fi
 137                                 ;;
 138                         esac
 139                 fi
 140         done
 141         echo ""
 142 }
 143
 144 run_hooks() {
 145         local arg="$1"; shift
 146         for func in "$@"; do
 147                 eval "$func $arg"
 148         done
 149 }
 150
 151 ask_bool() {
 152         local default="$1"; shift;
 153         local answer="$default"
 154
 155         [ "$INTERACTIVE" -eq 1 ] && {
 156                 case "$default" in
 157                         0) echo -n "$* (y/N): ";;
 158                         *) echo -n "$* (Y/n): ";;
 159                 esac
 160                 read answer
 161                 case "$answer" in
 162                         y*) answer=1;;
 163                         n*) answer=0;;
 164                         *) answer="$default";;
 165                 esac
 166         }
 167         [ "$answer" -gt 0 ]
 168 }
 169
 170 v() {
 171         [ "$VERBOSE" -ge 1 ] && echo "$@"
 172 }
 173
 174 rootfs_type() {
 175         /bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 176 }
 177
 178 get_image() { # <source> [ <command> ]
 179         local from="$1"
 180         local conc="$2"
 181         local cmd
 182
 183         case "$from" in
 184                 http://*|ftp://*) cmd="wget -O- -q";;
 185                 *) cmd="cat";;
 186         esac
 187         if [ -z "$conc" ]; then
 188                 local magic="$(eval $cmd $from 2>/dev/null | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 189                 case "$magic" in
 190                         1f8b) conc="zcat";;
 191                         425a) conc="bzcat";;
 192                 esac
 193         fi
 194
 195         eval "$cmd $from 2>/dev/null ${conc:+| $conc}"
 196 }
 197
 198 get_magic_word() {
 199         (get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
 200 }
 201
 202 get_magic_long() {
 203         (get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
 204 }
 205
 206 jffs2_copy_config() {
 207         if grep rootfs_data /proc/mtd >/dev/null; then
 208                 # squashfs+jffs2
 209                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 210         else
 211                 # jffs2
 212                 mtd jffs2write "$CONF_TAR" rootfs
 213         fi
 214 }
 215
 216 default_do_upgrade() {
 217         sync
 218         if [ "$SAVE_CONFIG" -eq 1 ]; then
 219                 get_image "$1" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
 220         else
 221                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 222         fi
 223 }
 224
 225 do_upgrade() {
 226         v "Performing system upgrade..."
 227         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 228                 platform_do_upgrade "$ARGV"
 229         else
 230                 default_do_upgrade "$ARGV"
 231         fi
 232
 233         if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
 234                 platform_copy_config
 235         fi
 236
 237         v "Upgrade completed"
 238         [ -n "$DELAY" ] && sleep "$DELAY"
 239         ask_bool 1 "Reboot" && {
 240                 v "Rebooting system..."
 241                 reboot -f
 242                 sleep 5
 243                 echo b 2>/dev/null >/proc/sysrq-trigger
 244         }
 245 }