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