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Diffstat (limited to 'package/base-files/files/lib/upgrade/common.sh')
| -rw-r--r-- | package/base-files/files/lib/upgrade/common.sh | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh new file mode 100644 index 000000000..e6de34849 --- /dev/null +++ b/package/base-files/files/lib/upgrade/common.sh @@ -0,0 +1,230 @@ +#!/bin/sh + +RAM_ROOT=/tmp/root + +ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; } +libs() { ldd $* | awk '{print $3}'; } + +install_file() { # <file> [ <file> ... ] + for file in "$@"; do + dest="$RAM_ROOT/$file" + [ -f $file -a ! -f $dest ] && { + dir="$(dirname $dest)" + mkdir -p "$dir" + cp $file $dest + } + done +} + +install_bin() { # <file> [ <symlink> ... ] + src=$1 + files=$1 + [ -x "$src" ] && files="$src $(libs $src)" + install_file $files + [ -e /lib/ld-linux.so.3 ] && { + install_file /lib/ld-linux.so.3 + } + shift + for link in "$@"; do { + dest="$RAM_ROOT/$link" + dir="$(dirname $dest)" + mkdir -p "$dir" + [ -f "$dest" ] || ln -s $src $dest + }; done +} + +pivot() { # <new_root> <old_root> + mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1 + mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \ + mount -o move /proc $1/proc && \ + pivot_root $1 $1$2 || { + umount $1 $1 + return 1 + } + + mount -o move $2/sys /sys + mount -o move $2/dev /dev + mount -o move $2/tmp /tmp + mount -o move $2/overlay /overlay 2>&- + return 0 +} + +run_ramfs() { # <command> [...] + install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount \ + /sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd \ + /bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \ + /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump \ + /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc + + install_bin /sbin/mtd + for file in $RAMFS_COPY_BIN; do + install_bin $file + done + install_file /etc/resolv.conf /lib/functions.sh /lib/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA + + pivot $RAM_ROOT /mnt || { + echo "Failed to switch over to ramfs. Please reboot." + exit 1 + } + + mount -o remount,ro /mnt + umount -l /mnt + + grep /overlay /proc/mounts > /dev/null && { + mount -o remount,ro /overlay + umount -l /overlay + } + + # spawn a new shell from ramdisk to reduce the probability of cache issues + exec /bin/busybox ash -c "$*" +} + +kill_remaining() { # [ <signal> ] + local sig="${1:-TERM}" + echo -n "Sending $sig to remaining processes ... " + + local stat + for stat in /proc/[0-9]*/stat; do + [ -f "$stat" ] || continue + + local pid name state ppid rest + read pid name state ppid rest < $stat + name="${name#(}"; name="${name%)}" + + local cmdline + read cmdline < /proc/$pid/cmdline + + # Skip kernel threads + [ -n "$cmdline" ] || continue + + case "$name" in + # Skip essential services + *ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*) : ;; + + # Killable process + *) + if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then + echo -n "$name " + kill -$sig $pid 2>/dev/null + fi + ;; + esac + done + echo "" +} + +run_hooks() { + local arg="$1"; shift + for func in "$@"; do + eval "$func $arg" + done +} + +ask_bool() { + local default="$1"; shift; + local answer="$default" + + [ "$INTERACTIVE" -eq 1 ] && { + case "$default" in + 0) echo -n "$* (y/N): ";; + *) echo -n "$* (Y/n): ";; + esac + read answer + case "$answer" in + y*) answer=1;; + n*) answer=0;; + *) answer="$default";; + esac + } + [ "$answer" -gt 0 ] +} + +v() { + [ "$VERBOSE" -ge 1 ] && echo "$@" +} + +rootfs_type() { + mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }' +} + +get_image() { # <source> [ <command> ] + local from="$1" + local conc="$2" + local cmd + + case "$from" in + http://*|ftp://*) cmd="wget -O- -q";; + *) cmd="cat";; + esac + if [ -z "$conc" ]; then + local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')" + case "$magic" in + 1f8b) conc="zcat";; + 425a) conc="bzcat";; + esac + fi + + eval "$cmd $from ${conc:+| $conc}" +} + +get_magic_word() { + get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"' +} + +get_magic_long() { + get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"' +} + +refresh_mtd_partitions() { + mtd refresh rootfs +} + +jffs2_copy_config() { + if grep rootfs_data /proc/mtd >/dev/null; then + # squashfs+jffs2 + mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data + else + # jffs2 + mtd jffs2write "$CONF_TAR" rootfs + fi +} + +default_do_upgrade() { + sync + if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then + get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}" + else + get_image "$1" | mtd write - "${PART_NAME:-image}" + fi +} + +do_upgrade() { + v "Performing system upgrade..." + if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then + platform_do_upgrade "$ARGV" + else + default_do_upgrade "$ARGV" + fi + + [ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && { + v "Refreshing partitions" + if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then + platform_refresh_partitions + else + refresh_mtd_partitions + fi + if type 'platform_copy_config' >/dev/null 2>/dev/null; then + platform_copy_config + else + jffs2_copy_config + fi + } + v "Upgrade completed" + [ -n "$DELAY" ] && sleep "$DELAY" + ask_bool 1 "Reboot" && { + v "Rebooting system..." + reboot -f + sleep 5 + echo b 2>/dev/null >/proc/sysrq-trigger + } +} |