开发板上如何实现u盘自动挂载到某个目录

我这个礼拜实现了用udev+hal+dbus的方式实现了： 当有热插拔设备的时候这个热插拔事件通过Udev向Hal发送Netlink socket消息，Hal在经过对消息的解析，最后将热插拔事件通知Dbus。
但是Hal这个开源软件比较大， 而且依赖于glib，所以想把它抽掉。
所以我想请教一下大家怎样在开发板上实现u盘自动挂载并通知应用程序的方法。

我想这个功能用udev自己应该也可以实现，这是Angstrom里面的做法：

1）在udev的rules里加上下面几行

复制代码 # Media automounting SUBSYSTEM=="block", ACTION=="add"    RUN+="/etc/udev/scripts/mount.sh" SUBSYSTEM=="block", ACTION=="remove" RUN+="/etc/udev/scripts/mount.sh"

2）创建脚本/etc/udev/scripts/mount.sh

复制代码 #!/bin/sh # # Called from udev # Attemp to mount any added block devices # and remove any removed devices # MOUNT="/bin/mount" PMOUNT="/usr/bin/pmount" UMOUNT="/bin/umount" name="`basename "$DEVNAME"`" for line in `cat /etc/udev/mount.blacklist | grep -v ^#` do     if ( echo "$DEVNAME" | grep -q "$line" )     then         logger "udev/mount.sh" "[$DEVNAME] is blacklisted, ignoring"         exit 0     fi done automount() {         ! test -d "/media/$name" && mkdir -p "/media/$name"          if ! $MOUNT -t auto -o sync $DEVNAME "/media/$name"     then         #logger "mount.sh/automount" "$MOUNT -t auto $DEVNAME \"/media/$name\" failed!"         rm_dir "/media/$name"     else         logger "mount.sh/automount" "Auto-mount of [/media/$name] successful"         touch "/tmp/.automount-$name"     fi }      rm_dir() {     # We do not want to rm -r populated directories     if test "`find "$1" | wc -l | tr -d " "`" -lt 2 -a -d "$1"     then         ! test -z "$1" && rm -r "$1"     else         logger "mount.sh/automount" "Not removing non-empty directory [$1]"     fi } if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ]; then     if [ -x "$PMOUNT" ]; then         $PMOUNT $DEVNAME 2> /dev/null     elif [ -x $MOUNT ]; then             $MOUNT $DEVNAME 2> /dev/null     fi          # If the device isn't mounted at this point, it isn't configured in fstab     # 20061107: Small correction: The rootfs partition may be called just "rootfs" and not by     #         its true device name so this would break. If the rootfs is mounted on two places     #        during boot, it confuses the heck out of fsck. So Im auto-adding the root-partition     #        to /etc/udev/mount.blacklist via postinst     cat /proc/mounts | awk '{print $1}' | grep -q "^$DEVNAME$" || automount      fi if [ "$ACTION" = "remove" ] && [ -x "$UMOUNT" ] && [ -n "$DEVNAME" ]; then     for mnt in `cat /proc/mounts | grep "$DEVNAME" | cut -f 2 -d " " `     do         $UMOUNT $mnt     done          # Remove empty directories from auto-mounter     test -e "/tmp/.automount-$name" && rm_dir "/media/$name" fi

这样，当block设备载入或卸载时，系统会自动尝试将其挂载到/media目录下的对应设备名的目录下

感谢楼主回复！

我在/etc/udev/rules.d 下面加了一个10-usb.rules的文件，内容是：
KERNEL=="sda", SUBSYSTEM=="block" RUN+="/root/usbmount.sh"

我在root下面加了usbmount.sh 内容是：
#!/bin/bash
LOG=/var/log/usb-hotplug.log
#lap=$(date --rfc-3339=ns)
#echo "$lop: $DEVPATH requesting $ACTION" >> $LOG
echo "kluter auto mount"
if[ $ACTION == "add" ]
    then
        mount -t vfat -o umask=000,noatime,async,codepage=936,iocharset=gb2312 \
            /dev/sda /var/tmp
elif[ $ACTION == "remove" ]
    then
    umount -l /var/tmp
fi

可是当板子跑起来的时候我插入u盘， 还是不能自动mount，照你说的方法也试过了，还是不行，而且我感觉脚本根本就没有跑起来，因为echo的字串没有印出来，/var/log下面也没有生成usb-hotplug.log日志。

我用的文件系统是光盘自带的。难道是规则文件没有被udevd识别么？

那就找原因啊，为什么脚本没有跑起来

嗯，我再找找看

还是挂不上，郁闷～

现在我觉得很奇怪的是，我写了一个简单的脚本：
#!/bin/sh
echo "kluter auto mount"
if [ $ACTION = "add" ]; then
    /bin/mount /dev/sda /var/tmp
elif [ $ACTION = "remove" ]; then
    /bin/umount -l /var/tmp
fi

我照shell编程里面说的#chmod +x usb.sh   然后./usb.sh 结果报错：-/bin/sh: ./usb.sh: not found

我又 #sh usb.sh 又报错：
kluter auto mount
usb.sh: line 5: syntax error: "elif" unexpected (expecting "then")

搞不懂了，我都是按照shell编程里面的语法。

我不知道你的shell出了什么问题，但你至少需要把
if [ $ACTION = "add" ]; then
改成
if [ “$ACTION” = "add" ]; then

谢谢，这个确实是语法错误
不过我现在在脚本里只写了一个ls命令，在PC上可以跑，但是开发板上跑不了
我觉得应该是开发板shell有问题。

HAL这个开源的东西 去哪里下啊？？我写了一个qt检测U盘插拔的东西，在板子上运行时提示："?????????QDBusInterface?" "The name org.freedesktop.Hal was not provided by any
.service files"
Object::connect: No such signal QDBusAbstractInterface::DeviceAdded(QString)
Object::connect:  (receiver name: 'Widget')
Object::connect: No such signal QDBusAbstractInterface::DeviceRemoved(QString)
Object::connect:  (receiver name: 'Widget')
这什么意思啊？？是不是没有HAL？？？