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Tom Mekken
Asked: 2022-05-07 01:36:08 +0800 CST

udev 规则适用，但不设置组

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我有一个 STM32-Bluepill 板，我在其中刷了一个 USB 引导加载程序。如果我将它连接到我的计算机，它安装在/dev/ttyACM0. lsusb显示为Bus 001 Device 006: ID 1eaf:0004 Leaflabs Maple serial interface

对于 Arduino 项目diy，我的电脑上确实有一个组。因此，对于 Bluepill，我创建了以下 udev 规则：

#Bootloader-Mode
DRIVERS=="usb", SUBSYSTEMS=="usb", ATTRS{idVendor}=="1eaf", ATTRS{idProduct}=="0004", GROUP="diy", MODE="0660"
#Normal-Operation-Mode
DRIVERS=="usb", SUBSYSTEMS=="usb", ATTRS{idVendor}=="1eaf", ATTRS{idProduct}=="0003", GROUP="diy", MODE="0660"

这两个规则都适用，但没有一个正确设置组/dev/ttyACM0（它总是uucp）。我知道应用了这些规则，因为我目前通过将模式设置为来使用解决方法0666。这给了我使用设备的权限，但无论如何我想正确设置组。

uucp仅由我的默认规则之一设置：/usr/lib/udev/rules.d/50-udev-default.rules. 但我的规则在于，/etc/udev/rules.d/100-bluepill.rules它应该具有更高的优先级。

linux udev

1 个回答

  1. Best Answer

    虽然数字前缀是指定 udev 规则顺序的常规方式，但处理实际上是词法的。来自man udev：

    RULES FILES
       The udev rules are read from the files located in the system rules
       directories /lib/udev/rules.d and /usr/local/lib/udev/rules.d, the
       volatile runtime directory /run/udev/rules.d and the local
       administration directory /etc/udev/rules.d. All rules files are
       collectively sorted and processed in lexical order, regardless of the
       directories in which they live. However, files with identical filenames
       replace each other. Files in /etc have the highest priority, files in
       /run take precedence over files with the same name under /usr. This can
       be used to override a system-supplied rules file with a local file if
       needed; a symlink in /etc with the same name as a rules file in /lib,
       pointing to /dev/null, disables the rules file entirely. Rule files
       must have the extension .rules; other extensions are ignored.

    所以在(1 < 5)之前100-bluepill.rules排序。要使您的规则最后应用，请选择类似. 50-udev-default.rules99-bluepill.rules

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