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 $files
  24         [ -e /lib/ld-linux.so.3 ] && {
  25                 install_file /lib/ld-linux.so.3
  26         }
  27         shift
  28         for link in "$@"; 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         mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
  38         mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
  39         mount -o noatime,move /proc $1/proc && \
  40         pivot_root $1 $1$2 || {
  41         umount -l $1 $1
  42                 return 1
  43         }
  44
  45         mount -o noatime,move $2/sys /sys
  46         mount -o noatime,move $2/dev /dev
  47         mount -o noatime,move $2/tmp /tmp
  48         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         for file in $RAMFS_COPY_BIN; do
  61                 install_bin $file
  62         done
  63         install_file /etc/resolv.conf /lib/functions.sh /lib/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
  64
  65         supivot $RAM_ROOT /mnt || {
  66                 echo "Failed to switch over to ramfs. Please reboot."
  67                 exit 1
  68         }
  69
  70         mount -o remount,ro /mnt
  71         umount -l /mnt
  72
  73         grep /overlay /proc/mounts > /dev/null && {
  74                 mount -o noatime,remount,ro /overlay
  75                 umount -l /overlay
  76         }
  77
  78         # spawn a new shell from ramdisk to reduce the probability of cache issues
  79         exec /bin/busybox ash -c "$*"
  80 }
  81
  82 kill_remaining() { # [ <signal> ]
  83         local sig="${1:-TERM}"
  84         echo -n "Sending $sig to remaining processes ... "
  85
  86         local stat
  87         for stat in /proc/[0-9]*/stat; do
  88                 [ -f "$stat" ] || continue
  89
  90                 local pid name state ppid rest
  91                 read pid name state ppid rest < $stat
  92                 name="${name#(}"; name="${name%)}"
  93
  94                 local cmdline
  95                 read cmdline < /proc/$pid/cmdline
  96
  97                 # Skip kernel threads
  98                 [ -n "$cmdline" ] || continue
  99
 100                 case "$name" in
 101                         # Skip essential services
 102                         *ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*) : ;;
 103
 104                         # Killable process
 105                         *)
 106                                 if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
 107                                         echo -n "$name "
 108                                         kill -$sig $pid 2>/dev/null
 109                                 fi
 110                         ;;
 111                 esac
 112         done
 113         echo ""
 114 }
 115
 116 run_hooks() {
 117         local arg="$1"; shift
 118         for func in "$@"; do
 119                 eval "$func $arg"
 120         done
 121 }
 122
 123 ask_bool() {
 124         local default="$1"; shift;
 125         local answer="$default"
 126
 127         [ "$INTERACTIVE" -eq 1 ] && {
 128                 case "$default" in
 129                         0) echo -n "$* (y/N): ";;
 130                         *) echo -n "$* (Y/n): ";;
 131                 esac
 132                 read answer
 133                 case "$answer" in
 134                         y*) answer=1;;
 135                         n*) answer=0;;
 136                         *) answer="$default";;
 137                 esac
 138         }
 139         [ "$answer" -gt 0 ]
 140 }
 141
 142 v() {
 143         [ "$VERBOSE" -ge 1 ] && echo "$@"
 144 }
 145
 146 rootfs_type() {
 147         mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
 148 }
 149
 150 get_image() { # <source> [ <command> ]
 151         local from="$1"
 152         local conc="$2"
 153         local cmd
 154
 155         case "$from" in
 156                 http://*|ftp://*) cmd="wget -O- -q";;
 157                 *) cmd="cat";;
 158         esac
 159         if [ -z "$conc" ]; then
 160                 local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
 161                 case "$magic" in
 162                         1f8b) conc="zcat";;
 163                         425a) conc="bzcat";;
 164                 esac
 165         fi
 166
 167         eval "$cmd $from ${conc:+| $conc}"
 168 }
 169
 170 get_magic_word() {
 171         get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
 172 }
 173
 174 get_magic_long() {
 175         get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 176 }
 177
 178 refresh_mtd_partitions() {
 179         mtd refresh rootfs
 180 }
 181
 182 jffs2_copy_config() {
 183         if grep rootfs_data /proc/mtd >/dev/null; then
 184                 # squashfs+jffs2
 185                 mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
 186         else
 187                 # jffs2
 188                 mtd jffs2write "$CONF_TAR" rootfs
 189         fi
 190 }
 191
 192 default_do_upgrade() {
 193         sync
 194         if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
 195                 get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
 196         else
 197                 get_image "$1" | mtd write - "${PART_NAME:-image}"
 198         fi
 199 }
 200
 201 do_upgrade() {
 202         v "Performing system upgrade..."
 203         if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
 204                 platform_do_upgrade "$ARGV"
 205         else
 206                 default_do_upgrade "$ARGV"
 207         fi
 208
 209         [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
 210                 v "Refreshing partitions"
 211                 if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
 212                         platform_refresh_partitions
 213                 else
 214                         refresh_mtd_partitions
 215                 fi
 216                 if type 'platform_copy_config' >/dev/null 2>/dev/null; then
 217                         platform_copy_config
 218                 else
 219                         jffs2_copy_config
 220                 fi
 221         }
 222         v "Upgrade completed"
 223         [ -n "$DELAY" ] && sleep "$DELAY"
 224         ask_bool 1 "Reboot" && {
 225                 v "Rebooting system..."
 226                 reboot -f
 227                 sleep 5
 228                 echo b 2>/dev/null >/proc/sysrq-trigger
 229         }
 230 }