OpenWRT mt7620n 系统升级引起的问题

OpenWRT系统升级採用 sysupgrade 这个脚本存放在/sbin/sysupgrade.

#!/bin/sh

. /lib/functions.sh

# initialize defaults

RAMFS_COPY_BIN=""	# extra programs for temporary ramfs root

RAMFS_COPY_DATA=""	# extra data files

export MTD_CONFIG_ARGS=""

export INTERACTIVE=0

export VERBOSE=1

export SAVE_CONFIG=1

export SAVE_OVERLAY=0

export DELAY=

export CONF_IMAGE=

export CONF_BACKUP_LIST=0

export CONF_BACKUP=

export CONF_RESTORE=

export NEED_IMAGE=

export HELP=0

export FORCE=0

export TEST=0

# parse options

while [ -n "$1" ]; do

	case "$1" in

		-i) export INTERACTIVE=1;;

		-d) export DELAY="$2"; shift;;

		-v) export VERBOSE="$(($VERBOSE + 1))";;

		-q) export VERBOSE="$(($VERBOSE - 1))";;

		-n) export SAVE_CONFIG=0;;

		-c) export SAVE_OVERLAY=1;;

		-b|--create-backup) export CONF_BACKUP="$2" NEED_IMAGE=1; shift;;

		-r|--restore-backup) export CONF_RESTORE="$2" NEED_IMAGE=1; shift;;

		-l|--list-backup) export CONF_BACKUP_LIST=1; break;;

		-f) export CONF_IMAGE="$2"; shift;;

		-F|--force) export FORCE=1;;

		-T|--test) export TEST=1;;

		-h|--help) export HELP=1; break;;

		-*)

			echo "Invalid option: $1"

			exit 1

		;;

		*) break;;

	esac

	shift;

done

export CONFFILES=/tmp/sysupgrade.conffiles

export CONF_TAR=/tmp/sysupgrade.tgz

export ARGV="$*"

export ARGC="$#"

[ -z "$ARGV" -a -z "$NEED_IMAGE" -o $HELP -gt 0 ] && {

	cat <<EOF

Usage: $0 [<upgrade-option>...] <image file or URL>

       $0 [-q] [-i] <backup-command> <file>

upgrade-option:

	-d <delay>   add a delay before rebooting

	-f <config>  restore configuration from .tar.gz (file or url)

	-i           interactive mode

	-c           attempt to preserve all changed files in /etc/

	-n           do not save configuration over reflash

	-T | --test

	             Verify image and config .tar.gz but do not actually flash.

	-F | --force

	             Flash image even if image checks fail, this is dangerous!

	-q           less verbose

	-v           more verbose

	-h | --help  display this help

backup-command:

	-b | --create-backup <file>

	             create .tar.gz of files specified in sysupgrade.conf

	             then exit. Does not flash an image. If file is '-',

	             i.e. stdout, verbosity is set to 0 (i.e. quiet).

	-r | --restore-backup <file>

	             restore a .tar.gz created with sysupgrade -b

	             then exit. Does not flash an image. If file is '-',

	             the archive is read from stdin.

	-l | --list-backup

	             list the files that would be backed up when calling

	             sysupgrade -b. Does not create a backup file.

EOF

	exit 1

}

[ -n "$ARGV" -a -n "$NEED_IMAGE" ] && {

	cat <<-EOF

		-b|--create-backup and -r|--restore-backup do not perform a firmware upgrade.

		Do not specify both -b|-r and a firmware image.

	EOF

	exit 1

}

# prevent messages from clobbering the tarball when using stdout

[ "$CONF_BACKUP" = "-" ] && export VERBOSE=0

add_uci_conffiles() {

	local file="$1"

	( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \

		/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \

		-type f 2>/dev/null;

	  opkg list-changed-conffiles ) | sort -u > "$file"

	return 0

}

add_overlayfiles() {

	local file="$1"

	find /overlay/etc/ -type f | sed \

		-e 's,^/overlay/,/,' \

		-e '\,/META_[a-zA-Z0-9]*$,d' \

		-e '\,/functions.sh$,d' \

		-e '\,/[^/]*-opkg$,d' \

	> "$file"

	return 0

}

# hooks

sysupgrade_image_check="platform_check_image"

[ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \

	sysupgrade_init_conffiles="add_uci_conffiles" || \

	sysupgrade_init_conffiles="add_overlayfiles"

include /lib/upgrade

do_save_conffiles() {

	local conf_tar="${1:-$CONF_TAR}"

	[ -z "$(rootfs_type)" ] && {

		echo "Cannot save config while running from ramdisk."

		ask_bool 0 "Abort" && exit

		return 0

	}

	run_hooks "$CONFFILES" $sysupgrade_init_conffiles

	ask_bool 0 "Edit config file list" && vi "$CONFFILES"

	v "Saving config files..."

	[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""

	tar c${TAR_V}zf "$conf_tar" -T "$CONFFILES" 2>/dev/null

	rm -f "$CONFFILES"

}

if [ $CONF_BACKUP_LIST -eq 1 ]; then

	add_uci_conffiles "$CONFFILES"

	cat "$CONFFILES"

	rm -f "$CONFFILES"

	exit 0

fi

if [ -n "$CONF_BACKUP" ]; then

	do_save_conffiles "$CONF_BACKUP"

	exit $?

fi

if [ -n "$CONF_RESTORE" ]; then

	if [ "$CONF_RESTORE" != "-" ] && [ ! -f "$CONF_RESTORE" ]; then

		echo "Backup archive '$CONF_RESTORE' not found."

		exit 1

	fi

	[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""

	tar -C / -x${TAR_V}zf "$CONF_RESTORE"

	exit $?

fi

type platform_check_image >/dev/null 2>/dev/null || {

	echo "Firmware upgrade is not implemented for this platform."

	exit 1

}

for check in $sysupgrade_image_check; do

	( eval "$check \"\$ARGV\"" ) || {

		if [ $FORCE -eq 1 ]; then

			echo "Image check '$check' failed but --force given - will update anyway!"

			break

		else

			echo "Image check '$check' failed."

			exit 1

		fi

	}

done

if [ -n "$CONF_IMAGE" ]; then

	case "$(get_magic_word $CONF_IMAGE cat)" in

		# .gz files

		1f8b) ;;

		*)

			echo "Invalid config file. Please use only .tar.gz files"

			exit 1

		;;

	esac

	get_image "$CONF_IMAGE" "cat" > "$CONF_TAR"

	export SAVE_CONFIG=1

elif ask_bool $SAVE_CONFIG "Keep config files over reflash"; then

	[ $TEST -eq 1 ] || do_save_conffiles

	export SAVE_CONFIG=1

else

	export SAVE_CONFIG=0

fi

if [ $TEST -eq 1 ]; then

	exit 0

fi

run_hooks "" $sysupgrade_pre_upgrade

ubus call system upgrade

touch /tmp/sysupgrade

if [ ! -f /tmp/failsafe ] ; then

	kill_remaining TERM

	sleep 3

	kill_remaining KILL

fi

if [ -n "$(rootfs_type)" ]; then

	v "Switching to ramdisk..."

	run_ramfs '. /lib/functions.sh; include /lib/upgrade; do_upgrade'

else

	do_upgrade

fi

源代码自己看吧，shell写的东西，我如今也是一知半解。可是最好还是碍我解决这个问题，參照某某某的固件，

在rc.local里面加入了

ifup -a

仿照加入后，不起作用。

研习正常固件跑起来的wifi,通常是，

/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.也就是说没实用，重新启动系统也不起作用。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，至于问题到底出在哪里。我眼下还是没有解决。

可是我找到了解决方式。当然这仅仅是暂时的，为什么升级后这些数据不在了，须要进一步研究。

对照无线起不来的情况，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还有一个暂时目录，而在系统重新启动的时候并未建立此文件，由于系统的默认配置/etc/config/wiereless文件已经存在。

这或许就是root cause,还需验证，我的解决方式是。在rc.local下推断软连接是否存在。不存在则建立此软连接，然后ifup -a

#detect_rt2860v2函数用于检測是否存在驱动

detect_rt2860v2() {

local i=-1

#推断系统是否存在rt2860v2_ap。不存在则退出

cd /sys/module/

[ -d rt2860v2_ap ] || return

<span style="color:#FF0000;">#检測系统存在多少个wifi接口,

while grep -qs "^ *ra$((++i)):" /proc/net/dev; do

config_get type ra${i} type

[ "$type" = rt2860v2 ] && continue

</span>

<span style="color:#006600;">#检查并创建WiFi驱动配置链接

[ -f /etc/Wireless/RT2860/RT2860.dat ] || {

mkdir -p /etc/Wireless/RT2860/

ln -s /tmp/RT2860.dat /etc/Wireless/RT2860/RT2860.dat

}

</span>

first_enable

cat <<EOF

config wifi-device ra${i}

option type rt2860v2

option mode 9

option channel auto

option txpower 100

option ht 20+40

option country US

# REMOVE THIS LINE TO ENABLE WIFI:

option disabled 0

config wifi-iface

option device ra${i}

option network lan

option mode ap

option ssid PandoraBox${i#0}_$(cat /sys/class/net/ra${i}/address|awk -F ":" '{print $4""$5""$6 }'| tr a-z A-Z)

option encryption none

EOF

ifconfig ra0 down

done

}

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，尽管以上分析事实上已经给出了答案。

巴特西

OpenWRT mt7620n 系统升级引起的问题

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