UDEV 规则配置

官方文档：https://www.reactivated.net/writing_udev_rules.html
KERNEL / SUBSYSTEM / DRIVER / ATTR 只匹配本设备不匹配父设备. 加个S，就可以在本设备以及父设备整条链上搜索匹配。 KERNELS / SUBSYSTEMS / DRIVERS / ATTRS

字符匹配：

* - match any character, zero or more times
? - match any character exactly once
[] - match any single character specified in the brackets, ranges are also permitted

替换符

$kernel, %k  		The kernel name for this device.
$number, %n  		The kernel number for this device. For example, "sda3" has kernel number 3.
$devpath, %p		The devpath of the device.
$id, %b			The name of the device matched while searching the devpath upwards for SUBSYSTEMS, KERNELS, DRIVERS, and ATTRS.
$driver			The driver name of the device matched while searching the devpath upwards for SUBSYSTEMS, KERNELS, DRIVERS, and ATTRS.
$attr{file}, %s{file}	The value of a sysfs attribute found at the device where all keys of the rule have matched. If the matching
			device does not have such an attribute, and a previous KERNELS, SUBSYSTEMS, DRIVERS, or ATTRS test selected a
			parent device, then the attribute from that parent device is used.
			If the attribute is a symlink, the last element of the symlink target is returned as the value.
%%：			符号 % 本身。
$$：			符号 $ 本身。

获取设备信息：
- udevadm info 指令取代 udevinfo
- udevadm info -a -p /sys/block/sda 获取设备ATTRS各项属性
last_rule - 到本条规则为止，后续规则不起作用
- OPTIONS+="last_rule"
udevadm test /sys/block/sda 测试规则
udevadm control --reload-rules 修改规则后重新加载生效
- 或者 udevadm control -R

NAME= 只对网路设备起作用

NAME
    The name to use for a network interface. See
    systemd.link(5) for a higher-level mechanism
    for setting the interface name. The name of a
    device node cannot be changed by udev, only
    additional symlinks can be created.

示例

ubuntu默认的usb storage mount 规则 /etc/udev/rules.d/10-usb-storage.rules ：

KERNEL!="sd[a-z][0-9]",GOTO="automount_exit"
ACTION=="add", SUBSYSTEM=="block", RUN+="/bin/mkdir -p /media/%k", RUN+="/usr/bin/mount $devnode /media/%k"
ACTION=="remove", RUN+="/usr/bin/umount /media/%k",RUN+="/bin/rmdir /media/%k"
LABEL="automount_exit"

指定类型

ACTION=="add", KERNEL=="sd*[0-9]", SUBSYSTEMS=="block", SYMLINK+="sd-myself", ATTRS{model}=="Your_Harddisk_Model"`

目录

UDEV 规则配置

示例