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