16

I wrote this rule for testing purpose:

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

based on the following info:

# 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==""

and:

# 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

But when I wanted to test it, it gave me this log:

# 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

And as you can see, the symlink is created, but the name hasn't changed, and I got the following error:

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

The other thing is that the link points randomly to sdb, sdb1, sdb2, etc:

# 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

It changes every time I plug the pendrive in.

The task here is to change the name of the device from sdb (or whatever that would be) to pendrak and also create a link to it. The error claimed that "kernel device nodes can not be renamed" -- does it mean that I can't change the name at all, and all I can do is to create symlinks?

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1 Answer 1

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19

According to udev manual, there's no way to change the names of files in the /dev/ directory:

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.

So, in my case I should write rules similar to these:

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"

They create three links: pen1, pen2, pen3. Each of which links to the corresponding sdb (or what ever that would be) device, and simply opens and mounts them in the specified directories via udevil tool.

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6
  • What about wiki.archlinux.org/index.php/… Commented Mar 18, 2014 at 20:29
  • 2
    This only applies to network interfaces, as you can read in the answer. Commented Mar 18, 2014 at 23:16
  • 2
    Note: this used to work with other device types too, but this feature was removed with some systemd release. Commented Apr 6, 2016 at 11:54
  • If we cannot rename kernel device nodes anymore, any workarounds? Any brute force ways? :D Commented May 6, 2016 at 17:24
  • Just create symlinks. I'm doing it for all devices that need to have the same names no matter what. Commented May 7, 2016 at 7:15

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