Raspberry Pi上FAT32 USB记忆棒的默认文件权限 [英] Default file permissions for FAT32 USB stick on Raspberry Pi

问题描述

当我将已格式化为FAT32的USB闪存盘/缩略图驱动器插入Raspberry Pi(运行Raspbian)时，文件权限默认为644，我无法更改它们.

When I plug a USB stick/thumbdrive that has been formatted as FAT32 into a Raspberry Pi (running Raspbian) the file permissions default to 644 and I cannot change them.

我需要将存储棒保留为FAT32，以便可以将其用于Windows系统.

I need to leave the stick as FAT32 so it can be used back and forward to a Windows system.

我已经使用udev编写了一条规则，但是我无法使其正常工作.

I have written a rule using udev but I can't get it to work.

我的udev规则如下:

My udev rule looks like this:

# Set up any USB stick for full write access KERNEL=="sd?1", MODE="0777"

# Set up any USB stick for full write access KERNEL=="sd?1", MODE="0777"

我确定该规则已被触发，因为我已重命名该设备.它是在设置设备本身的权限，而不是设备上的单个文件.

I determined that the rule is getting triggered because I had it renaming the device. It is setting the permissions of the device itself, but not the individual files on the device.

我最终要实现的目标是能够从PHP写入USB记忆棒.

What I am ultimately trying to achieve is the ability to write to the USB stick from PHP.

我觉得我已经很接近答案了，但是看不到我想念的东西.

I feel I am very close to the answer but can't see what I am missing.

推荐答案

问题已解决-经过数小时并得到了我的Linux专家朋友Jox的大量建议.

Problem resolved - after several hours and much advice from my Linux guru friend Jox.

涉及到某种程度，并且可能有一种更简单的方法-如果有的话，很高兴得知.

It is somewhat involved and there may be an easier way - happy to hear about it if there is.

1)Disable GUI，这又禁用了自动挂载. (Pi仍然无头运行).

1) Disble GUI which in turn disables Automount. (The Pi is running headless anyway).

2)如下创建udev规则(保存在/etc/udev/rules.d/81-usbmount.rule中):

2) Create a udev rule as follows (saved in /etc/udev/rules.d/81-usbmount.rule ):

<code>
# Set up any USB stick for full write access

KERNEL=="sd?1", ACTION=="remove", RUN+="/home/pi/mount_usb.sh"
KERNEL=="sd?1", SYMLINK="stick1"
KERNEL=="sd?1", ACTION=="add", RUN+="/home/pi/mount_usb.sh"
</code>

这会给USB驱动器一个统一的名称，并运行一个脚本来安装和卸载该驱动器.

This gives the USB drive a consistent name and runs a script to mount and unmount the drive.

3)向FSTAB添加一个条目(存储在/etc/fstab中):

3) Add an entry to FSTAB (stored in /etc/fstab):

 /dev/stick1     /media/usbstick  vfat    uid=www-data        0 0 

这会将默认用户ID设置为www-data，因为这是Apache/PHP运行的用户.

This sets the default user id to www-data because that is the user Apache/PHP runs as.

4)创建脚本以进行安装和卸载. (存储在/home/pi/mount_usb.sh中)

4) Create script to do the mount and unmount. (Stored in /home/pi/mount_usb.sh)

<code>
 #! /bin/bash
 # script to mount and unmount USB stick
 echo "Starting $ACTION" > /home/pi/mylog.txt
 case $ACTION in
   add)
      echo "Mounting" >> /home/pi/mylog.txt
      umount /dev/david  2>> /home/pi/mylog.txt
      mount -a  2>> /home/pi/mylog.txt ;;
   remove) 
      echo "Unmounting" >> /home/pi/mylog.txt
      umount /dev/sda1  2>> /home/pi/mylog.txt ;;
   *)  
      echo "NOTHING x$ACTIONx" >> /home/pi/mylog.txt ;;
 esac 
</code>

回声仅用于调试目的.

[我也不认为我已经掌握了代码格式化的内容]

[I don't think I've mastered the code formatting thingy either]

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