原文地址:http://blog.csdn.net/qianguozheng/article/details/27237175
OpenWRT系统升级采用 sysupgrade 这个脚本存放在/sbin/sysupgrade.
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#!/bin/sh
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. /lib/functions.sh
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# initialize defaults
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RAMFS_COPY_BIN="" # extra programs for temporary ramfs root
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RAMFS_COPY_DATA="" # extra data files
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export MTD_CONFIG_ARGS=""
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export INTERACTIVE=0
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export VERBOSE=1
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export SAVE_CONFIG=1
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export SAVE_OVERLAY=0
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export DELAY=
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export CONF_IMAGE=
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export CONF_BACKUP_LIST=0
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export CONF_BACKUP=
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export CONF_RESTORE=
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export NEED_IMAGE=
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export HELP=0
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export FORCE=0
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export TEST=0
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# parse options
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while [ -n "$1" ]; do
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case "$1" in
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-i) export INTERACTIVE=1;;
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-d) export DELAY="$2"; shift;;
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-v) export VERBOSE="$(($VERBOSE + 1))";;
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-q) export VERBOSE="$(($VERBOSE - 1))";;
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-n) export SAVE_CONFIG=0;;
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-c) export SAVE_OVERLAY=1;;
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-b|--create-backup) export CONF_BACKUP="$2" NEED_IMAGE=1; shift;;
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-r|--restore-backup) export CONF_RESTORE="$2" NEED_IMAGE=1; shift;;
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-l|--list-backup) export CONF_BACKUP_LIST=1; break;;
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-f) export CONF_IMAGE="$2"; shift;;
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-F|--force) export FORCE=1;;
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-T|--test) export TEST=1;;
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-h|--help) export HELP=1; break;;
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-*)
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echo "Invalid option: $1"
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exit 1
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;;
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*) break;;
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esac
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shift;
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done
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export CONFFILES=/tmp/sysupgrade.conffiles
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export CONF_TAR=/tmp/sysupgrade.tgz
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export ARGV="$*"
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export ARGC="$#"
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[ -z "$ARGV" -a -z "$NEED_IMAGE" -o $HELP -gt 0 ] && {
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cat <<EOF
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Usage: $0 [<upgrade-option>...] <image file or URL>
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$0 [-q] [-i] <backup-command> <file>
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upgrade-option:
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-d <delay> add a delay before rebooting
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-f <config> restore configuration from .tar.gz (file or url)
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-i interactive mode
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-c attempt to preserve all changed files in /etc/
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-n do not save configuration over reflash
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-T | --test
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Verify image and config .tar.gz but do not actually flash.
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-F | --force
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Flash image even if image checks fail, this is dangerous!
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-q less verbose
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-v more verbose
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-h | --help display this help
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backup-command:
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-b | --create-backup <file>
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create .tar.gz of files specified in sysupgrade.conf
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then exit. Does not flash an image. If file is '-',
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i.e. stdout, verbosity is set to 0 (i.e. quiet).
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-r | --restore-backup <file>
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restore a .tar.gz created with sysupgrade -b
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then exit. Does not flash an image. If file is '-',
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the archive is read from stdin.
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-l | --list-backup
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list the files that would be backed up when calling
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sysupgrade -b. Does not create a backup file.
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EOF
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exit 1
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}
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[ -n "$ARGV" -a -n "$NEED_IMAGE" ] && {
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cat <<-EOF
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-b|--create-backup and -r|--restore-backup do not perform a firmware upgrade.
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Do not specify both -b|-r and a firmware image.
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EOF
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exit 1
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}
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# prevent messages from clobbering the tarball when using stdout
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[ "$CONF_BACKUP" = "-" ] && export VERBOSE=0
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add_uci_conffiles() {
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local file="$1"
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( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
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/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
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-type f 2>/dev/null;
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opkg list-changed-conffiles ) | sort -u > "$file"
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return 0
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}
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add_overlayfiles() {
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local file="$1"
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find /overlay/etc/ -type f | sed \
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-e 's,^/overlay/,/,' \
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-e '\,/META_[a-zA-Z0-9]*$,d' \
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-e '\,/functions.sh$,d' \
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-e '\,/[^/]*-opkg$,d' \
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> "$file"
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return 0
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}
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# hooks
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sysupgrade_image_check="platform_check_image"
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[ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \
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sysupgrade_init_conffiles="add_uci_conffiles" || \
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sysupgrade_init_conffiles="add_overlayfiles"
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include /lib/upgrade
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do_save_conffiles() {
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local conf_tar="${1:-$CONF_TAR}"
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[ -z "$(rootfs_type)" ] && {
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echo "Cannot save config while running from ramdisk."
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ask_bool 0 "Abort" && exit
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return 0
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}
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run_hooks "$CONFFILES" $sysupgrade_init_conffiles
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ask_bool 0 "Edit config file list" && vi "$CONFFILES"
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v "Saving config files..."
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[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
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tar c${TAR_V}zf "$conf_tar" -T "$CONFFILES" 2>/dev/null
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rm -f "$CONFFILES"
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}
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if [ $CONF_BACKUP_LIST -eq 1 ]; then
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add_uci_conffiles "$CONFFILES"
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cat "$CONFFILES"
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rm -f "$CONFFILES"
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exit 0
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fi
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if [ -n "$CONF_BACKUP" ]; then
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do_save_conffiles "$CONF_BACKUP"
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exit $?
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fi
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if [ -n "$CONF_RESTORE" ]; then
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if [ "$CONF_RESTORE" != "-" ] && [ ! -f "$CONF_RESTORE" ]; then
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echo "Backup archive '$CONF_RESTORE' not found."
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exit 1
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fi
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[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
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tar -C / -x${TAR_V}zf "$CONF_RESTORE"
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exit $?
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fi
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type platform_check_image >/dev/null 2>/dev/null || {
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echo "Firmware upgrade is not implemented for this platform."
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exit 1
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}
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for check in $sysupgrade_image_check; do
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( eval "$check \"\$ARGV\"" ) || {
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if [ $FORCE -eq 1 ]; then
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echo "Image check '$check' failed but --force given - will update anyway!"
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break
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else
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echo "Image check '$check' failed."
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exit 1
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fi
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}
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done
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if [ -n "$CONF_IMAGE" ]; then
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case "$(get_magic_word $CONF_IMAGE cat)" in
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# .gz files
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1f8b) ;;
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*)
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echo "Invalid config file. Please use only .tar.gz files"
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exit 1
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;;
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esac
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get_image "$CONF_IMAGE" "cat" > "$CONF_TAR"
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export SAVE_CONFIG=1
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elif ask_bool $SAVE_CONFIG "Keep config files over reflash"; then
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[ $TEST -eq 1 ] || do_save_conffiles
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export SAVE_CONFIG=1
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else
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export SAVE_CONFIG=0
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fi
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if [ $TEST -eq 1 ]; then
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exit 0
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fi
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run_hooks "" $sysupgrade_pre_upgrade
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ubus call system upgrade
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touch /tmp/sysupgrade
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if [ ! -f /tmp/failsafe ] ; then
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kill_remaining TERM
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sleep 3
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kill_remaining KILL
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fi
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if [ -n "$(rootfs_type)" ]; then
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v "Switching to ramdisk..."
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run_ramfs '. /lib/functions.sh; include /lib/upgrade; do_upgrade'
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else
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do_upgrade
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fi
源码自己看吧,shell写的东西,我现在也是一知半解,但是不妨碍我解决问题,参照某某某的固件,
在rc.local里面添加了
仿照添加后,不起作用。
研习正常固件跑起来的wifi,一般是,
/tmp/RT2860.dat文件存在
/etc/Wireless/RT2860/RT2860.dat 为/tmp/RT2860.dat的软链接
rt2860ap_v2.ko存在
ifconfig 发下ra0也不存在
lsmod查看,ko被引用次数为0.也就是说没有用,重启系统也不起作用。恢复出厂设置就OK了。甚是费解!
初步断定: ra0没有起来,软连接不存在。可能是wireless启动不成功的原因,至于问题究竟出在哪里,我目前还是没有解决。
但是我找到了解决方案,当然这只是临时的,为什么升级后这些数据不在了,需要进一步研究。
对比无线起不来的情况,发现/etc/Wireless/RT2860/RT2860.dat 不存在。就是说软连接可能是在升级过程中转移到另一个临时文件夹,而在系统重启的时候并未建立此文件,因为系统的默认配置/etc/config/wiereless文件已经存在。
这也许就是root cause,还需验证,我的解决方案是,在rc.local下判断软连接是否存在,不存在则建立此软连接,然后ifup -a
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#detect_rt2860v2函数用于检测是否存在驱动
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detect_rt2860v2() {
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local i=-1
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#判断系统是否存在rt2860v2_ap,不存在则退出
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cd /sys/module/
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[ -d rt2860v2_ap ] || return
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<span style="color:#FF0000;">#检测系统存在多少个wifi接口,
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while grep -qs "^ *ra$((++i)):" /proc/net/dev; do
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config_get type ra${i} type
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[ "$type" = rt2860v2 ] && continue
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span>
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<span style="color:#006600;">#检查并创建WiFi驱动配置链接
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[ -f /etc/Wireless/RT2860/RT2860.dat ] || {
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mkdir -p /etc/Wireless/RT2860/
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ln -s /tmp/RT2860.dat /etc/Wireless/RT2860/RT2860.dat
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}
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span>
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first_enable
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cat <<EOF
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config wifi-device ra${i}
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option type rt2860v2
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option mode 9
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option channel auto
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option txpower 100
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option ht 20+40
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option country US
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# REMOVE THIS LINE TO ENABLE WIFI:
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option disabled 0
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config wifi-iface
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option device ra${i}
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option network lan
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option mode ap
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option ssid PandoraBox${i#0}_$(cat /sys/class/net/ra${i}/address|awk -F ":" '{print $4""$5""$6 }'| tr a-z A-Z)
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option encryption none
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EOF
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ifconfig ra0 down
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done
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}
还需继续研究下启动过程,不然这个问题还是不能真像大白,虽然以上分析其实已经给出了答案。
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