有没有办法在/ dev目录中更改设备名称？

13

我出于测试目的编写了此规则：

SUBSYSTEMS=="usb", ATTRS{manufacturer}=="Kingston", ATTRS{serial}=="001CC0EC34A2BB318709004B", ATTRS{idVendor}=="0951", ATTRS{idProduct}=="1642", SYMLINK+="pen", NAME="pendrak"

根据以下信息：

# udevadm info --name=/dev/sdb --attribute-walk

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0/2:0:0:0/block/sdb':
    KERNEL=="sdb"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{ro}=="0"
    ATTR{size}=="30299520"
    ATTR{stat}=="     419        0     3352     1208        0        0        0        0        0     1120     1208"
    ATTR{range}=="16"
    ATTR{discard_alignment}=="0"
    ATTR{events}=="media_change"
    ATTR{ext_range}=="256"
    ATTR{events_poll_msecs}=="3000"
    ATTR{alignment_offset}=="0"
    ATTR{inflight}=="       0        0"
    ATTR{removable}=="1"
    ATTR{capability}=="51"
    ATTR{events_async}==""

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0/2:0:0:0':
    KERNELS=="2:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{rev}=="PMAP"
    ATTRS{type}=="0"
    ATTRS{scsi_level}=="0"
    ATTRS{model}=="DT 101 G2       "
    ATTRS{state}=="running"
    ATTRS{queue_type}=="none"
    ATTRS{iodone_cnt}=="0x2da"
    ATTRS{iorequest_cnt}=="0x2da"
    ATTRS{evt_capacity_change_reported}=="0"
    ATTRS{timeout}=="30"
    ATTRS{evt_media_change}=="0"
    ATTRS{max_sectors}=="240"
    ATTRS{ioerr_cnt}=="0x2"
    ATTRS{queue_depth}=="1"
    ATTRS{vendor}=="Kingston"
    ATTRS{evt_soft_threshold_reached}=="0"
    ATTRS{device_blocked}=="0"
    ATTRS{evt_mode_parameter_change_reported}=="0"
    ATTRS{evt_lun_change_reported}=="0"
    ATTRS{evt_inquiry_change_reported}=="0"
    ATTRS{iocounterbits}=="32"
    ATTRS{eh_timeout}=="10"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0':
    KERNELS=="target2:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2':
    KERNELS=="host2"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0':
    KERNELS=="2-5:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb-storage"
    ATTRS{bInterfaceClass}=="08"
    ATTRS{bInterfaceSubClass}=="06"
    ATTRS{bInterfaceProtocol}=="50"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-5':
    KERNELS=="2-5"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="5"
    ATTRS{idVendor}=="0951"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="2"
    ATTRS{devnum}=="4"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="200mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0100"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="001CC0EC34A2BB318709004B"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="1927"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Kingston"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="1642"
    ATTRS{bDeviceClass}=="00"
    ATTRS{product}=="DT 101 G2"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2':
    KERNELS=="usb2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="2"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="8"
    ATTRS{bcdDevice}=="0312"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="0000:00:1d.7"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="89"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 3.12-1-amd64 ehci_hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="EHCI Host Controller"

  looking at parent device '/devices/pci0000:00/0000:00:1d.7':
    KERNELS=="0000:00:1d.7"
    SUBSYSTEMS=="pci"
    DRIVERS=="ehci-pci"
    ATTRS{irq}=="23"
    ATTRS{subsystem_vendor}=="0x1458"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0320"
    ATTRS{companion}==""
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{local_cpus}=="00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003"
    ATTRS{device}=="0x27cc"
    ATTRS{uframe_periodic_max}=="100"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}==""
    ATTRS{local_cpulist}=="0-1"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x5006"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

和：

# udevadm info --name=/dev/sdb
P: /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0/2:0:0:0/block/sdb
N: sdb
S: disk/by-id/usb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0
S: disk/by-path/pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0
S: pen
E: DEVLINKS=/dev/disk/by-id/usb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0 /dev/disk/by-path/pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0 /dev/pen
E: DEVNAME=/dev/sdb
E: DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0/2:0:0:0/block/sdb
E: DEVTYPE=disk
E: ID_BUS=usb
E: ID_INSTANCE=0:0
E: ID_MODEL=DT_101_G2
E: ID_MODEL_ENC=DT\x20101\x20G2\x20\x20\x20\x20\x20\x20\x20
E: ID_MODEL_ID=1642
E: ID_PART_TABLE_TYPE=dos
E: ID_PATH=pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0
E: ID_PATH_TAG=pci-0000_00_1d_7-usb-0_5_1_0-scsi-0_0_0_0
E: ID_REVISION=PMAP
E: ID_SERIAL=Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0
E: ID_SERIAL_SHORT=001CC0EC34A2BB318709004B
E: ID_TYPE=disk
E: ID_USB_DRIVER=usb-storage
E: ID_USB_INTERFACES=:080650:
E: ID_USB_INTERFACE_NUM=00
E: ID_VENDOR=Kingston
E: ID_VENDOR_ENC=Kingston
E: ID_VENDOR_ID=0951
E: MAJOR=8
E: MINOR=16
E: SUBSYSTEM=block
E: USEC_INITIALIZED=32380484

但是当我想测试它时，它给了我这个日志：

# udevadm test /devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0/2:0:0:0/block/sdb
calling: test
version 204
This program is for debugging only, it does not run any program
specified by a RUN key. It may show incorrect results, because
some values may be different, or not available at a simulation run.

=== trie on-disk ===
tool version:          204
file size:         5729797 bytes
header size             80 bytes
strings            1262125 bytes
nodes              4467592 bytes
load module index
Skipping overridden file: /lib/udev/rules.d/95-keymap.rules.
read rules file: /lib/udev/rules.d/42-usb-hid-pm.rules
read rules file: /lib/udev/rules.d/50-firmware.rules
read rules file: /lib/udev/rules.d/50-udev-default.rules
read rules file: /lib/udev/rules.d/55-dm.rules
read rules file: /lib/udev/rules.d/56-lvm.rules
read rules file: /lib/udev/rules.d/60-cdrom_id.rules
read rules file: /lib/udev/rules.d/60-fuse.rules
read rules file: /lib/udev/rules.d/60-gnupg.rules
read rules file: /lib/udev/rules.d/60-libfreenect0.2.rules
read rules file: /lib/udev/rules.d/60-libgphoto2-6.rules
read rules file: /lib/udev/rules.d/60-libpisock9.rules
read rules file: /lib/udev/rules.d/60-libsane.rules
read rules file: /lib/udev/rules.d/60-nvidia-kernel-common.rules
read rules file: /lib/udev/rules.d/60-pcmcia.rules
read rules file: /lib/udev/rules.d/60-persistent-alsa.rules
read rules file: /lib/udev/rules.d/60-persistent-input.rules
read rules file: /lib/udev/rules.d/60-persistent-serial.rules
read rules file: /lib/udev/rules.d/60-persistent-storage-dm.rules
read rules file: /lib/udev/rules.d/60-persistent-storage-tape.rules
read rules file: /lib/udev/rules.d/60-persistent-storage.rules
read rules file: /lib/udev/rules.d/60-persistent-v4l.rules
read rules file: /lib/udev/rules.d/60-virtualbox-dkms.rules
read rules file: /lib/udev/rules.d/60-virtualbox.rules
read rules file: /lib/udev/rules.d/61-accelerometer.rules
read rules file: /etc/udev/rules.d/61-removable-storage-polling.rules
read rules file: /lib/udev/rules.d/64-btrfs.rules
read rules file: /lib/udev/rules.d/64-xorg-xkb.rules
read rules file: /lib/udev/rules.d/69-cd-sensors.rules
IMPORT found builtin 'usb_id --export %p', replacing /lib/udev/rules.d/69-cd-sensors.rules:89
read rules file: /lib/udev/rules.d/69-libmtp.rules
read rules file: /lib/udev/rules.d/69-lvm-metad.rules
read rules file: /lib/udev/rules.d/69-xorg-vmmouse.rules
read rules file: /lib/udev/rules.d/70-btrfs.rules
read rules file: /etc/udev/rules.d/70-persistent-cd.rules
read rules file: /etc/udev/rules.d/70-persistent-net.rules
read rules file: /lib/udev/rules.d/70-power-switch.rules
read rules file: /lib/udev/rules.d/70-udev-acl.rules
read rules file: /etc/udev/rules.d/70-zram.rules
read rules file: /lib/udev/rules.d/75-cd-aliases-generator.rules
read rules file: /lib/udev/rules.d/75-net-description.rules
read rules file: /lib/udev/rules.d/75-persistent-net-generator.rules
read rules file: /lib/udev/rules.d/75-probe_mtd.rules
read rules file: /lib/udev/rules.d/75-tty-description.rules
read rules file: /lib/udev/rules.d/78-sound-card.rules
read rules file: /lib/udev/rules.d/80-btrfs-lvm.rules
read rules file: /lib/udev/rules.d/80-drivers.rules
read rules file: /lib/udev/rules.d/80-net-name-slot.rules
read rules file: /lib/udev/rules.d/80-networking.rules
read rules file: /lib/udev/rules.d/85-hdparm.rules
read rules file: /lib/udev/rules.d/85-hwclock.rules
read rules file: /lib/udev/rules.d/90-alsa-restore.rules
read rules file: /lib/udev/rules.d/90-pulseaudio.rules
read rules file: /lib/udev/rules.d/91-permissions.rules
read rules file: /lib/udev/rules.d/95-cd-devices.rules
read rules file: /lib/udev/rules.d/95-keyboard-force-release.rules
read rules file: /etc/udev/rules.d/95-keymap.rules
read rules file: /lib/udev/rules.d/95-udev-late.rules
read rules file: /lib/udev/rules.d/97-bluetooth-hid2hci.rules
read rules file: /etc/udev/rules.d/99-local.rules
rules contain 393216 bytes tokens (32768 * 12 bytes), 31233 bytes strings
27768 strings (226512 bytes), 24687 de-duplicated (198361 bytes), 3082 trie nodes used
IMPORT builtin 'usb_id' /lib/udev/rules.d/60-persistent-storage.rules:68
/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0: if_class 8 protocol 6
IMPORT builtin 'path_id' /lib/udev/rules.d/60-persistent-storage.rules:89
LINK 'disk/by-id/usb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0' /lib/udev/rules.d/60-persistent-storage.rules:108
LINK 'disk/by-path/pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0' /lib/udev/rules.d/60-persistent-storage.rules:130
IMPORT '/sbin/blkid -o udev -p /dev/sdb' /lib/udev/rules.d/60-persistent-storage.rules:151
starting '/sbin/blkid -o udev -p /dev/sdb'
'/sbin/blkid -o udev -p /dev/sdb' [12103] exit with return code 0
RUN '/etc/init.d/hdparm hotplug' /lib/udev/rules.d/85-hdparm.rules:1
GROUP 6 /lib/udev/rules.d/91-permissions.rules:4
GROUP 25 /lib/udev/rules.d/91-permissions.rules:5
GROUP 25 /lib/udev/rules.d/91-permissions.rules:9
NAME="pendrak" ignored, kernel device nodes can not be renamed; please fix it in /etc/udev/rules.d/99-local.rules:1
LINK 'pen' /etc/udev/rules.d/99-local.rules:1
handling device node '/dev/sdb', devnum=b8:16, mode=0660, uid=0, gid=25
preserve permissions /dev/sdb, 060660, uid=0, gid=25
preserve already existing symlink '/dev/block/8:16' to '../sdb'
found 'b8:16' claiming '/run/udev/links/\x2fdisk\x2fby-id\x2fusb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0'
creating link '/dev/disk/by-id/usb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0' to '/dev/sdb'
preserve already existing symlink '/dev/disk/by-id/usb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0' to '../../sdb'
found 'b8:16' claiming '/run/udev/links/\x2fdisk\x2fby-path\x2fpci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0'
creating link '/dev/disk/by-path/pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0' to '/dev/sdb'
preserve already existing symlink '/dev/disk/by-path/pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0' to '../../sdb'
found 'b8:16' claiming '/run/udev/links/\x2fpen'
creating link '/dev/pen' to '/dev/sdb'
preserve already existing symlink '/dev/pen' to 'sdb'
.ID_FS_TYPE_NEW=
ACTION=add
DEVLINKS=/dev/disk/by-id/usb-Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0 /dev/disk/by-path/pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0 /dev/pen
DEVNAME=/dev/sdb
DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb2/2-5/2-5:1.0/host2/target2:0:0/2:0:0:0/block/sdb
DEVTYPE=disk
ID_BUS=usb
ID_FS_TYPE=
ID_INSTANCE=0:0
ID_MODEL=DT_101_G2
ID_MODEL_ENC=DT\x20101\x20G2\x20\x20\x20\x20\x20\x20\x20
ID_MODEL_ID=1642
ID_PART_TABLE_TYPE=dos
ID_PATH=pci-0000:00:1d.7-usb-0:5:1.0-scsi-0:0:0:0
ID_PATH_TAG=pci-0000_00_1d_7-usb-0_5_1_0-scsi-0_0_0_0
ID_REVISION=PMAP
ID_SERIAL=Kingston_DT_101_G2_001CC0EC34A2BB318709004B-0:0
ID_SERIAL_SHORT=001CC0EC34A2BB318709004B
ID_TYPE=disk
ID_USB_DRIVER=usb-storage
ID_USB_INTERFACES=:080650:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=Kingston
ID_VENDOR_ENC=Kingston
ID_VENDOR_ID=0951
MAJOR=8
MINOR=16
SUBSYSTEM=block
USEC_INITIALIZED=32380484
run: '/etc/init.d/hdparm hotplug'
unload module index

如您所见，符号链接已创建，但名称未更改，并且出现以下错误：

NAME="pendrak" ignored, kernel device nodes can not be renamed; please fix it in /etc/udev/rules.d/99-local.rules:1

另一件事是该链接随机指向sdb，sdb1，sdb2等：

# ls -al /dev/pen
lrwxrwxrwx 1 root root 3 Mar 13 12:49 /dev/pen -> sdb
# ls -al /dev/pen
lrwxrwxrwx 1 root root 4 Mar 13 12:53 /dev/pen -> sdb2
# ls -al /dev/pen
lrwxrwxrwx 1 root root 4 Mar 13 12:53 /dev/pen -> sdb1
# ls -al /dev/pen
lrwxrwxrwx 1 root root 4 Mar 13 12:53 /dev/pen -> sdb2
# ls -al /dev/pen
lrwxrwxrwx 1 root root 4 Mar 13 12:53 /dev/pen -> sdb3

每次插入Pendrive时，它都会改变。

此处的任务是将设备的名称从sdb（或其他名称）更改为pendrak，并创建指向该设备的链接。该错误声称“无法重命名内核设备节点” –是否意味着我根本无法更改名称，而我所能做的就是创建符号链接？

devices  udev 
— 米哈伊尔·莫尔菲科夫（Mikhail Morfikov）
source

Answers:

14

根据udev手册，无法更改/dev/目录中文件的名称：

NAME
The name to use for a network interface. The name of a device node
cannot be changed by udev, only additional symlinks can be created.

因此，就我而言，我应该编写类似于以下规则：

KERNEL=="sd?3", ACTION=="add", ENV{ID_SERIAL_SHORT}=="001CC0EC34A2BB318709004B", \
    SYMLINK+="pen%n", \
    RUN+="/usr/bin/udevil mount /dev/pen%n /mnt/dane"

KERNEL=="sd?1", ACTION=="add", ENV{ID_SERIAL_SHORT}=="001CC0EC34A2BB318709004B", \
    SYMLINK+="pen%n", \
    RUN+="/usr/bin/udevil mount /dev/pen%n /mnt/debian"

KERNEL=="sd?2", ACTION=="add", ENV{ID_SERIAL_SHORT}=="001CC0EC34A2BB318709004B", \
    SYMLINK+="pen%n", \
    RUN+="/sbin/cryptsetup luksOpen /dev/pen%n pen%n --key-file=/home/morfik/Desktop/pen2.key", \
    RUN+="/usr/bin/udevil mount /dev/mapper/pen%n /mnt/szyfr"
KERNEL=="sd?2", ACTION=="remove", ENV{ID_SERIAL_SHORT}=="001CC0EC34A2BB318709004B", \
    RUN+="/sbin/cryptsetup luksClose pen%n"

它们创建三个链接：pen1，pen2，pen3。每个链接都链接到相应的sdb设备（或以后的设备），并通过udevil工具简单地打开并将它们安装在指定目录中。

— 米哈伊尔·莫尔菲科夫（Mikhail Morfikov）
source
— Orion
2
这仅适用于网络接口，您可以在答案中阅读。
— Mikhail Morfikov 2014年
1
注意：此功能以前也可以与其他设备类型一起使用，但是此功能已在某些systemd版本中删除。
— ibre5041 '16
如果我们不能再重命名内核设备节点，那么有什么解决方法？有暴力手段吗？：D
— Midnite '16
只需创建符号链接。我正在为所有需要使用相同名称的设备执行此操作。
— 米哈伊尔·莫尔菲科夫
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