Udev rules for seemingly indistinguishable devices

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I'm trying to use udev to automatically set up symlinks to an Intel RealSense D415. This is because I use several cameras on the machine and need to be able to reliably refer to them via a filename (that doesn't change on reboot).



The RealSense D415 creates three video devices in /dev. I'm having no problem setting up symlinks for the first two, but as far as I can see the first and third devices are identical apart from the KERNEL and KERNELS attributes which are liable to change if another camera is plugged in first.



How can I use a udev rule to differentiate between these?



Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0:



 looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0':
 KERNEL=="video0"
 SUBSYSTEM=="video4linux"
 DRIVER==""
 ATTRdev_debug=="0"
 ATTRindex=="0"
 ATTRname=="Intel(R) RealSense(TM) 415: Int"

 looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0':
 KERNELS=="2-1:1.0"
 SUBSYSTEMS=="usb"
 DRIVERS=="uvcvideo"
 ATTRSauthorized=="1"
 ATTRSbAlternateSetting==" 0"
 ATTRSbInterfaceClass=="0e"
 ATTRSbInterfaceNumber=="00"
 ATTRSbInterfaceProtocol=="00"
 ATTRSbInterfaceSubClass=="01"
 ATTRSbNumEndpoints=="01"
 ATTRSiad_bFirstInterface=="00"
 ATTRSiad_bFunctionClass=="0e"
 ATTRSiad_bFunctionProtocol=="00"
 ATTRSiad_bFunctionSubClass=="03"
 ATTRSiad_bInterfaceCount=="03"
 ATTRSinterface=="Intel(R) RealSense(TM) 415 Depth"
 ATTRSsupports_autosuspend=="1"

 looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
 KERNELS=="2-1"
 SUBSYSTEMS=="usb"
 DRIVERS=="usb"
 ATTRSauthorized=="1"
 ATTRSavoid_reset_quirk=="0"
 ATTRSbConfigurationValue=="1"
 ATTRSbDeviceClass=="ef"
 ATTRSbDeviceProtocol=="01"
 ATTRSbDeviceSubClass=="02"
 ATTRSbMaxPacketSize0=="9"
 ATTRSbMaxPower=="440mA"
 ATTRSbNumConfigurations=="1"
 ATTRSbNumInterfaces==" 5"
 ATTRSbcdDevice=="508f"
 ATTRSbmAttributes=="c0"
 ATTRSbusnum=="2"
 ATTRSconfiguration==""
 ATTRSdevnum=="2"
 ATTRSdevpath=="1"
 ATTRSidProduct=="0ad3"
 ATTRSidVendor=="8086"
 ATTRSltm_capable=="no"
 ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
 ATTRSmaxchild=="0"
 ATTRSproduct=="Intel(R) RealSense(TM) 415"
 ATTRSquirks=="0x0"
 ATTRSremovable=="removable"
 ATTRSserial=="736613021813"
 ATTRSspeed=="5000"
 ATTRSurbnum=="56"
 ATTRSversion==" 3.10"

 looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
 KERNELS=="usb2"
 SUBSYSTEMS=="usb"
 DRIVERS=="usb"
 ATTRSauthorized=="1"
 ATTRSauthorized_default=="1"
 ATTRSavoid_reset_quirk=="0"
 ATTRSbConfigurationValue=="1"
 ATTRSbDeviceClass=="09"
 ATTRSbDeviceProtocol=="03"
 ATTRSbDeviceSubClass=="00"
 ATTRSbMaxPacketSize0=="9"
 ATTRSbMaxPower=="0mA"
 ATTRSbNumConfigurations=="1"
 ATTRSbNumInterfaces==" 1"
 ATTRSbcdDevice=="0415"
 ATTRSbmAttributes=="e0"
 ATTRSbusnum=="2"
 ATTRSconfiguration==""
 ATTRSdevnum=="1"
 ATTRSdevpath=="0"
 ATTRSidProduct=="0003"
 ATTRSidVendor=="1d6b"
 ATTRSinterface_authorized_default=="1"
 ATTRSltm_capable=="yes"
 ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
 ATTRSmaxchild=="10"
 ATTRSproduct=="xHCI Host Controller"
 ATTRSquirks=="0x0"
 ATTRSremovable=="unknown"
 ATTRSserial=="0000:00:14.0"
 ATTRSspeed=="5000"
 ATTRSurbnum=="101"
 ATTRSversion==" 3.00"

 looking at parent device '/devices/pci0000:00/0000:00:14.0':
 KERNELS=="0000:00:14.0"
 SUBSYSTEMS=="pci"
 DRIVERS=="xhci_hcd"
 ATTRSbroken_parity_status=="0"
 ATTRSclass=="0x0c0330"
 ATTRSconsistent_dma_mask_bits=="64"
 ATTRSd3cold_allowed=="1"
 ATTRSdbc=="disabled"
 ATTRSdevice=="0xa2af"
 ATTRSdma_mask_bits=="64"
 ATTRSdriver_override=="(null)"
 ATTRSenable=="1"
 ATTRSirq=="123"
 ATTRSlocal_cpulist=="0-3"
 ATTRSlocal_cpus=="f"
 ATTRSmsi_bus=="1"
 ATTRSnuma_node=="-1"
 ATTRSrevision=="0x00"
 ATTRSsubsystem_device=="0x310c"
 ATTRSsubsystem_vendor=="0x17aa"
 ATTRSvendor=="0x8086"

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


Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2:



 looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2':
 KERNEL=="video2"
 SUBSYSTEM=="video4linux"
 DRIVER==""
 ATTRdev_debug=="0"
 ATTRindex=="0"
 ATTRname=="Intel(R) RealSense(TM) 415: Int"

 looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3':
 KERNELS=="2-1:1.3"
 SUBSYSTEMS=="usb"
 DRIVERS=="uvcvideo"
 ATTRSauthorized=="1"
 ATTRSbAlternateSetting==" 0"
 ATTRSbInterfaceClass=="0e"
 ATTRSbInterfaceNumber=="03"
 ATTRSbInterfaceProtocol=="00"
 ATTRSbInterfaceSubClass=="01"
 ATTRSbNumEndpoints=="00"
 ATTRSiad_bFirstInterface=="03"
 ATTRSiad_bFunctionClass=="0e"
 ATTRSiad_bFunctionProtocol=="00"
 ATTRSiad_bFunctionSubClass=="03"
 ATTRSiad_bInterfaceCount=="02"
 ATTRSinterface=="Intel(R) RealSense(TM) 415 RGB"
 ATTRSsupports_autosuspend=="1"

 looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
 KERNELS=="2-1"
 SUBSYSTEMS=="usb"
 DRIVERS=="usb"
 ATTRSauthorized=="1"
 ATTRSavoid_reset_quirk=="0"
 ATTRSbConfigurationValue=="1"
 ATTRSbDeviceClass=="ef"
 ATTRSbDeviceProtocol=="01"
 ATTRSbDeviceSubClass=="02"
 ATTRSbMaxPacketSize0=="9"
 ATTRSbMaxPower=="440mA"
 ATTRSbNumConfigurations=="1"
 ATTRSbNumInterfaces==" 5"
 ATTRSbcdDevice=="508f"
 ATTRSbmAttributes=="c0"
 ATTRSbusnum=="2"
 ATTRSconfiguration==""
 ATTRSdevnum=="2"
 ATTRSdevpath=="1"
 ATTRSidProduct=="0ad3"
 ATTRSidVendor=="8086"
 ATTRSltm_capable=="no"
 ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
 ATTRSmaxchild=="0"
 ATTRSproduct=="Intel(R) RealSense(TM) 415"
 ATTRSquirks=="0x0"
 ATTRSremovable=="removable"
 ATTRSserial=="736613021813"
 ATTRSspeed=="5000"
 ATTRSurbnum=="56"
 ATTRSversion==" 3.10"

 looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
 KERNELS=="usb2"
 SUBSYSTEMS=="usb"
 DRIVERS=="usb"
 ATTRSauthorized=="1"
 ATTRSauthorized_default=="1"
 ATTRSavoid_reset_quirk=="0"
 ATTRSbConfigurationValue=="1"
 ATTRSbDeviceClass=="09"
 ATTRSbDeviceProtocol=="03"
 ATTRSbDeviceSubClass=="00"
 ATTRSbMaxPacketSize0=="9"
 ATTRSbMaxPower=="0mA"
 ATTRSbNumConfigurations=="1"
 ATTRSbNumInterfaces==" 1"
 ATTRSbcdDevice=="0415"
 ATTRSbmAttributes=="e0"
 ATTRSbusnum=="2"
 ATTRSconfiguration==""
 ATTRSdevnum=="1"
 ATTRSdevpath=="0"
 ATTRSidProduct=="0003"
 ATTRSidVendor=="1d6b"
 ATTRSinterface_authorized_default=="1"
 ATTRSltm_capable=="yes"
 ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
 ATTRSmaxchild=="10"
 ATTRSproduct=="xHCI Host Controller"
 ATTRSquirks=="0x0"
 ATTRSremovable=="unknown"
 ATTRSserial=="0000:00:14.0"
 ATTRSspeed=="5000"
 ATTRSurbnum=="101"
 ATTRSversion==" 3.00"

 looking at parent device '/devices/pci0000:00/0000:00:14.0':
 KERNELS=="0000:00:14.0"
 SUBSYSTEMS=="pci"
 DRIVERS=="xhci_hcd"
 ATTRSbroken_parity_status=="0"
 ATTRSclass=="0x0c0330"
 ATTRSconsistent_dma_mask_bits=="64"
 ATTRSd3cold_allowed=="1"
 ATTRSdbc=="disabled"
 ATTRSdevice=="0xa2af"
 ATTRSdma_mask_bits=="64"
 ATTRSdriver_override=="(null)"
 ATTRSenable=="1"
 ATTRSirq=="123"
 ATTRSlocal_cpulist=="0-3"
 ATTRSlocal_cpus=="f"
 ATTRSmsi_bus=="1"
 ATTRSnuma_node=="-1"
 ATTRSrevision=="0x00"
 ATTRSsubsystem_device=="0x310c"
 ATTRSsubsystem_vendor=="0x17aa"
 ATTRSvendor=="0x8086"

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





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    up vote
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    I'm trying to use udev to automatically set up symlinks to an Intel RealSense D415. This is because I use several cameras on the machine and need to be able to reliably refer to them via a filename (that doesn't change on reboot).



    The RealSense D415 creates three video devices in /dev. I'm having no problem setting up symlinks for the first two, but as far as I can see the first and third devices are identical apart from the KERNEL and KERNELS attributes which are liable to change if another camera is plugged in first.



    How can I use a udev rule to differentiate between these?



    Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0:



     looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0':
     KERNEL=="video0"
     SUBSYSTEM=="video4linux"
     DRIVER==""
     ATTRdev_debug=="0"
     ATTRindex=="0"
     ATTRname=="Intel(R) RealSense(TM) 415: Int"

     looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0':
     KERNELS=="2-1:1.0"
     SUBSYSTEMS=="usb"
     DRIVERS=="uvcvideo"
     ATTRSauthorized=="1"
     ATTRSbAlternateSetting==" 0"
     ATTRSbInterfaceClass=="0e"
     ATTRSbInterfaceNumber=="00"
     ATTRSbInterfaceProtocol=="00"
     ATTRSbInterfaceSubClass=="01"
     ATTRSbNumEndpoints=="01"
     ATTRSiad_bFirstInterface=="00"
     ATTRSiad_bFunctionClass=="0e"
     ATTRSiad_bFunctionProtocol=="00"
     ATTRSiad_bFunctionSubClass=="03"
     ATTRSiad_bInterfaceCount=="03"
     ATTRSinterface=="Intel(R) RealSense(TM) 415 Depth"
     ATTRSsupports_autosuspend=="1"

     looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
     KERNELS=="2-1"
     SUBSYSTEMS=="usb"
     DRIVERS=="usb"
     ATTRSauthorized=="1"
     ATTRSavoid_reset_quirk=="0"
     ATTRSbConfigurationValue=="1"
     ATTRSbDeviceClass=="ef"
     ATTRSbDeviceProtocol=="01"
     ATTRSbDeviceSubClass=="02"
     ATTRSbMaxPacketSize0=="9"
     ATTRSbMaxPower=="440mA"
     ATTRSbNumConfigurations=="1"
     ATTRSbNumInterfaces==" 5"
     ATTRSbcdDevice=="508f"
     ATTRSbmAttributes=="c0"
     ATTRSbusnum=="2"
     ATTRSconfiguration==""
     ATTRSdevnum=="2"
     ATTRSdevpath=="1"
     ATTRSidProduct=="0ad3"
     ATTRSidVendor=="8086"
     ATTRSltm_capable=="no"
     ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
     ATTRSmaxchild=="0"
     ATTRSproduct=="Intel(R) RealSense(TM) 415"
     ATTRSquirks=="0x0"
     ATTRSremovable=="removable"
     ATTRSserial=="736613021813"
     ATTRSspeed=="5000"
     ATTRSurbnum=="56"
     ATTRSversion==" 3.10"

     looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
     KERNELS=="usb2"
     SUBSYSTEMS=="usb"
     DRIVERS=="usb"
     ATTRSauthorized=="1"
     ATTRSauthorized_default=="1"
     ATTRSavoid_reset_quirk=="0"
     ATTRSbConfigurationValue=="1"
     ATTRSbDeviceClass=="09"
     ATTRSbDeviceProtocol=="03"
     ATTRSbDeviceSubClass=="00"
     ATTRSbMaxPacketSize0=="9"
     ATTRSbMaxPower=="0mA"
     ATTRSbNumConfigurations=="1"
     ATTRSbNumInterfaces==" 1"
     ATTRSbcdDevice=="0415"
     ATTRSbmAttributes=="e0"
     ATTRSbusnum=="2"
     ATTRSconfiguration==""
     ATTRSdevnum=="1"
     ATTRSdevpath=="0"
     ATTRSidProduct=="0003"
     ATTRSidVendor=="1d6b"
     ATTRSinterface_authorized_default=="1"
     ATTRSltm_capable=="yes"
     ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
     ATTRSmaxchild=="10"
     ATTRSproduct=="xHCI Host Controller"
     ATTRSquirks=="0x0"
     ATTRSremovable=="unknown"
     ATTRSserial=="0000:00:14.0"
     ATTRSspeed=="5000"
     ATTRSurbnum=="101"
     ATTRSversion==" 3.00"

     looking at parent device '/devices/pci0000:00/0000:00:14.0':
     KERNELS=="0000:00:14.0"
     SUBSYSTEMS=="pci"
     DRIVERS=="xhci_hcd"
     ATTRSbroken_parity_status=="0"
     ATTRSclass=="0x0c0330"
     ATTRSconsistent_dma_mask_bits=="64"
     ATTRSd3cold_allowed=="1"
     ATTRSdbc=="disabled"
     ATTRSdevice=="0xa2af"
     ATTRSdma_mask_bits=="64"
     ATTRSdriver_override=="(null)"
     ATTRSenable=="1"
     ATTRSirq=="123"
     ATTRSlocal_cpulist=="0-3"
     ATTRSlocal_cpus=="f"
     ATTRSmsi_bus=="1"
     ATTRSnuma_node=="-1"
     ATTRSrevision=="0x00"
     ATTRSsubsystem_device=="0x310c"
     ATTRSsubsystem_vendor=="0x17aa"
     ATTRSvendor=="0x8086"

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


    Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2:



     looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2':
     KERNEL=="video2"
     SUBSYSTEM=="video4linux"
     DRIVER==""
     ATTRdev_debug=="0"
     ATTRindex=="0"
     ATTRname=="Intel(R) RealSense(TM) 415: Int"

     looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3':
     KERNELS=="2-1:1.3"
     SUBSYSTEMS=="usb"
     DRIVERS=="uvcvideo"
     ATTRSauthorized=="1"
     ATTRSbAlternateSetting==" 0"
     ATTRSbInterfaceClass=="0e"
     ATTRSbInterfaceNumber=="03"
     ATTRSbInterfaceProtocol=="00"
     ATTRSbInterfaceSubClass=="01"
     ATTRSbNumEndpoints=="00"
     ATTRSiad_bFirstInterface=="03"
     ATTRSiad_bFunctionClass=="0e"
     ATTRSiad_bFunctionProtocol=="00"
     ATTRSiad_bFunctionSubClass=="03"
     ATTRSiad_bInterfaceCount=="02"
     ATTRSinterface=="Intel(R) RealSense(TM) 415 RGB"
     ATTRSsupports_autosuspend=="1"

     looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
     KERNELS=="2-1"
     SUBSYSTEMS=="usb"
     DRIVERS=="usb"
     ATTRSauthorized=="1"
     ATTRSavoid_reset_quirk=="0"
     ATTRSbConfigurationValue=="1"
     ATTRSbDeviceClass=="ef"
     ATTRSbDeviceProtocol=="01"
     ATTRSbDeviceSubClass=="02"
     ATTRSbMaxPacketSize0=="9"
     ATTRSbMaxPower=="440mA"
     ATTRSbNumConfigurations=="1"
     ATTRSbNumInterfaces==" 5"
     ATTRSbcdDevice=="508f"
     ATTRSbmAttributes=="c0"
     ATTRSbusnum=="2"
     ATTRSconfiguration==""
     ATTRSdevnum=="2"
     ATTRSdevpath=="1"
     ATTRSidProduct=="0ad3"
     ATTRSidVendor=="8086"
     ATTRSltm_capable=="no"
     ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
     ATTRSmaxchild=="0"
     ATTRSproduct=="Intel(R) RealSense(TM) 415"
     ATTRSquirks=="0x0"
     ATTRSremovable=="removable"
     ATTRSserial=="736613021813"
     ATTRSspeed=="5000"
     ATTRSurbnum=="56"
     ATTRSversion==" 3.10"

     looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
     KERNELS=="usb2"
     SUBSYSTEMS=="usb"
     DRIVERS=="usb"
     ATTRSauthorized=="1"
     ATTRSauthorized_default=="1"
     ATTRSavoid_reset_quirk=="0"
     ATTRSbConfigurationValue=="1"
     ATTRSbDeviceClass=="09"
     ATTRSbDeviceProtocol=="03"
     ATTRSbDeviceSubClass=="00"
     ATTRSbMaxPacketSize0=="9"
     ATTRSbMaxPower=="0mA"
     ATTRSbNumConfigurations=="1"
     ATTRSbNumInterfaces==" 1"
     ATTRSbcdDevice=="0415"
     ATTRSbmAttributes=="e0"
     ATTRSbusnum=="2"
     ATTRSconfiguration==""
     ATTRSdevnum=="1"
     ATTRSdevpath=="0"
     ATTRSidProduct=="0003"
     ATTRSidVendor=="1d6b"
     ATTRSinterface_authorized_default=="1"
     ATTRSltm_capable=="yes"
     ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
     ATTRSmaxchild=="10"
     ATTRSproduct=="xHCI Host Controller"
     ATTRSquirks=="0x0"
     ATTRSremovable=="unknown"
     ATTRSserial=="0000:00:14.0"
     ATTRSspeed=="5000"
     ATTRSurbnum=="101"
     ATTRSversion==" 3.00"

     looking at parent device '/devices/pci0000:00/0000:00:14.0':
     KERNELS=="0000:00:14.0"
     SUBSYSTEMS=="pci"
     DRIVERS=="xhci_hcd"
     ATTRSbroken_parity_status=="0"
     ATTRSclass=="0x0c0330"
     ATTRSconsistent_dma_mask_bits=="64"
     ATTRSd3cold_allowed=="1"
     ATTRSdbc=="disabled"
     ATTRSdevice=="0xa2af"
     ATTRSdma_mask_bits=="64"
     ATTRSdriver_override=="(null)"
     ATTRSenable=="1"
     ATTRSirq=="123"
     ATTRSlocal_cpulist=="0-3"
     ATTRSlocal_cpus=="f"
     ATTRSmsi_bus=="1"
     ATTRSnuma_node=="-1"
     ATTRSrevision=="0x00"
     ATTRSsubsystem_device=="0x310c"
     ATTRSsubsystem_vendor=="0x17aa"
     ATTRSvendor=="0x8086"

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





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      up vote
      0
      down vote

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      up vote
      0
      down vote

      favorite











      I'm trying to use udev to automatically set up symlinks to an Intel RealSense D415. This is because I use several cameras on the machine and need to be able to reliably refer to them via a filename (that doesn't change on reboot).



      The RealSense D415 creates three video devices in /dev. I'm having no problem setting up symlinks for the first two, but as far as I can see the first and third devices are identical apart from the KERNEL and KERNELS attributes which are liable to change if another camera is plugged in first.



      How can I use a udev rule to differentiate between these?



      Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0:



       looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0':
       KERNEL=="video0"
       SUBSYSTEM=="video4linux"
       DRIVER==""
       ATTRdev_debug=="0"
       ATTRindex=="0"
       ATTRname=="Intel(R) RealSense(TM) 415: Int"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0':
       KERNELS=="2-1:1.0"
       SUBSYSTEMS=="usb"
       DRIVERS=="uvcvideo"
       ATTRSauthorized=="1"
       ATTRSbAlternateSetting==" 0"
       ATTRSbInterfaceClass=="0e"
       ATTRSbInterfaceNumber=="00"
       ATTRSbInterfaceProtocol=="00"
       ATTRSbInterfaceSubClass=="01"
       ATTRSbNumEndpoints=="01"
       ATTRSiad_bFirstInterface=="00"
       ATTRSiad_bFunctionClass=="0e"
       ATTRSiad_bFunctionProtocol=="00"
       ATTRSiad_bFunctionSubClass=="03"
       ATTRSiad_bInterfaceCount=="03"
       ATTRSinterface=="Intel(R) RealSense(TM) 415 Depth"
       ATTRSsupports_autosuspend=="1"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
       KERNELS=="2-1"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="ef"
       ATTRSbDeviceProtocol=="01"
       ATTRSbDeviceSubClass=="02"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="440mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 5"
       ATTRSbcdDevice=="508f"
       ATTRSbmAttributes=="c0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="2"
       ATTRSdevpath=="1"
       ATTRSidProduct=="0ad3"
       ATTRSidVendor=="8086"
       ATTRSltm_capable=="no"
       ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
       ATTRSmaxchild=="0"
       ATTRSproduct=="Intel(R) RealSense(TM) 415"
       ATTRSquirks=="0x0"
       ATTRSremovable=="removable"
       ATTRSserial=="736613021813"
       ATTRSspeed=="5000"
       ATTRSurbnum=="56"
       ATTRSversion==" 3.10"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
       KERNELS=="usb2"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSauthorized_default=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="09"
       ATTRSbDeviceProtocol=="03"
       ATTRSbDeviceSubClass=="00"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="0mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 1"
       ATTRSbcdDevice=="0415"
       ATTRSbmAttributes=="e0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="1"
       ATTRSdevpath=="0"
       ATTRSidProduct=="0003"
       ATTRSidVendor=="1d6b"
       ATTRSinterface_authorized_default=="1"
       ATTRSltm_capable=="yes"
       ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
       ATTRSmaxchild=="10"
       ATTRSproduct=="xHCI Host Controller"
       ATTRSquirks=="0x0"
       ATTRSremovable=="unknown"
       ATTRSserial=="0000:00:14.0"
       ATTRSspeed=="5000"
       ATTRSurbnum=="101"
       ATTRSversion==" 3.00"

       looking at parent device '/devices/pci0000:00/0000:00:14.0':
       KERNELS=="0000:00:14.0"
       SUBSYSTEMS=="pci"
       DRIVERS=="xhci_hcd"
       ATTRSbroken_parity_status=="0"
       ATTRSclass=="0x0c0330"
       ATTRSconsistent_dma_mask_bits=="64"
       ATTRSd3cold_allowed=="1"
       ATTRSdbc=="disabled"
       ATTRSdevice=="0xa2af"
       ATTRSdma_mask_bits=="64"
       ATTRSdriver_override=="(null)"
       ATTRSenable=="1"
       ATTRSirq=="123"
       ATTRSlocal_cpulist=="0-3"
       ATTRSlocal_cpus=="f"
       ATTRSmsi_bus=="1"
       ATTRSnuma_node=="-1"
       ATTRSrevision=="0x00"
       ATTRSsubsystem_device=="0x310c"
       ATTRSsubsystem_vendor=="0x17aa"
       ATTRSvendor=="0x8086"

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


      Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2:



       looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2':
       KERNEL=="video2"
       SUBSYSTEM=="video4linux"
       DRIVER==""
       ATTRdev_debug=="0"
       ATTRindex=="0"
       ATTRname=="Intel(R) RealSense(TM) 415: Int"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3':
       KERNELS=="2-1:1.3"
       SUBSYSTEMS=="usb"
       DRIVERS=="uvcvideo"
       ATTRSauthorized=="1"
       ATTRSbAlternateSetting==" 0"
       ATTRSbInterfaceClass=="0e"
       ATTRSbInterfaceNumber=="03"
       ATTRSbInterfaceProtocol=="00"
       ATTRSbInterfaceSubClass=="01"
       ATTRSbNumEndpoints=="00"
       ATTRSiad_bFirstInterface=="03"
       ATTRSiad_bFunctionClass=="0e"
       ATTRSiad_bFunctionProtocol=="00"
       ATTRSiad_bFunctionSubClass=="03"
       ATTRSiad_bInterfaceCount=="02"
       ATTRSinterface=="Intel(R) RealSense(TM) 415 RGB"
       ATTRSsupports_autosuspend=="1"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
       KERNELS=="2-1"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="ef"
       ATTRSbDeviceProtocol=="01"
       ATTRSbDeviceSubClass=="02"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="440mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 5"
       ATTRSbcdDevice=="508f"
       ATTRSbmAttributes=="c0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="2"
       ATTRSdevpath=="1"
       ATTRSidProduct=="0ad3"
       ATTRSidVendor=="8086"
       ATTRSltm_capable=="no"
       ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
       ATTRSmaxchild=="0"
       ATTRSproduct=="Intel(R) RealSense(TM) 415"
       ATTRSquirks=="0x0"
       ATTRSremovable=="removable"
       ATTRSserial=="736613021813"
       ATTRSspeed=="5000"
       ATTRSurbnum=="56"
       ATTRSversion==" 3.10"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
       KERNELS=="usb2"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSauthorized_default=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="09"
       ATTRSbDeviceProtocol=="03"
       ATTRSbDeviceSubClass=="00"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="0mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 1"
       ATTRSbcdDevice=="0415"
       ATTRSbmAttributes=="e0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="1"
       ATTRSdevpath=="0"
       ATTRSidProduct=="0003"
       ATTRSidVendor=="1d6b"
       ATTRSinterface_authorized_default=="1"
       ATTRSltm_capable=="yes"
       ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
       ATTRSmaxchild=="10"
       ATTRSproduct=="xHCI Host Controller"
       ATTRSquirks=="0x0"
       ATTRSremovable=="unknown"
       ATTRSserial=="0000:00:14.0"
       ATTRSspeed=="5000"
       ATTRSurbnum=="101"
       ATTRSversion==" 3.00"

       looking at parent device '/devices/pci0000:00/0000:00:14.0':
       KERNELS=="0000:00:14.0"
       SUBSYSTEMS=="pci"
       DRIVERS=="xhci_hcd"
       ATTRSbroken_parity_status=="0"
       ATTRSclass=="0x0c0330"
       ATTRSconsistent_dma_mask_bits=="64"
       ATTRSd3cold_allowed=="1"
       ATTRSdbc=="disabled"
       ATTRSdevice=="0xa2af"
       ATTRSdma_mask_bits=="64"
       ATTRSdriver_override=="(null)"
       ATTRSenable=="1"
       ATTRSirq=="123"
       ATTRSlocal_cpulist=="0-3"
       ATTRSlocal_cpus=="f"
       ATTRSmsi_bus=="1"
       ATTRSnuma_node=="-1"
       ATTRSrevision=="0x00"
       ATTRSsubsystem_device=="0x310c"
       ATTRSsubsystem_vendor=="0x17aa"
       ATTRSvendor=="0x8086"

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





      udev video






      share













      I'm trying to use udev to automatically set up symlinks to an Intel RealSense D415. This is because I use several cameras on the machine and need to be able to reliably refer to them via a filename (that doesn't change on reboot).



      The RealSense D415 creates three video devices in /dev. I'm having no problem setting up symlinks for the first two, but as far as I can see the first and third devices are identical apart from the KERNEL and KERNELS attributes which are liable to change if another camera is plugged in first.



      How can I use a udev rule to differentiate between these?



      Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0:



       looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0/video4linux/video0':
       KERNEL=="video0"
       SUBSYSTEM=="video4linux"
       DRIVER==""
       ATTRdev_debug=="0"
       ATTRindex=="0"
       ATTRname=="Intel(R) RealSense(TM) 415: Int"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.0':
       KERNELS=="2-1:1.0"
       SUBSYSTEMS=="usb"
       DRIVERS=="uvcvideo"
       ATTRSauthorized=="1"
       ATTRSbAlternateSetting==" 0"
       ATTRSbInterfaceClass=="0e"
       ATTRSbInterfaceNumber=="00"
       ATTRSbInterfaceProtocol=="00"
       ATTRSbInterfaceSubClass=="01"
       ATTRSbNumEndpoints=="01"
       ATTRSiad_bFirstInterface=="00"
       ATTRSiad_bFunctionClass=="0e"
       ATTRSiad_bFunctionProtocol=="00"
       ATTRSiad_bFunctionSubClass=="03"
       ATTRSiad_bInterfaceCount=="03"
       ATTRSinterface=="Intel(R) RealSense(TM) 415 Depth"
       ATTRSsupports_autosuspend=="1"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
       KERNELS=="2-1"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="ef"
       ATTRSbDeviceProtocol=="01"
       ATTRSbDeviceSubClass=="02"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="440mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 5"
       ATTRSbcdDevice=="508f"
       ATTRSbmAttributes=="c0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="2"
       ATTRSdevpath=="1"
       ATTRSidProduct=="0ad3"
       ATTRSidVendor=="8086"
       ATTRSltm_capable=="no"
       ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
       ATTRSmaxchild=="0"
       ATTRSproduct=="Intel(R) RealSense(TM) 415"
       ATTRSquirks=="0x0"
       ATTRSremovable=="removable"
       ATTRSserial=="736613021813"
       ATTRSspeed=="5000"
       ATTRSurbnum=="56"
       ATTRSversion==" 3.10"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
       KERNELS=="usb2"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSauthorized_default=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="09"
       ATTRSbDeviceProtocol=="03"
       ATTRSbDeviceSubClass=="00"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="0mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 1"
       ATTRSbcdDevice=="0415"
       ATTRSbmAttributes=="e0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="1"
       ATTRSdevpath=="0"
       ATTRSidProduct=="0003"
       ATTRSidVendor=="1d6b"
       ATTRSinterface_authorized_default=="1"
       ATTRSltm_capable=="yes"
       ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
       ATTRSmaxchild=="10"
       ATTRSproduct=="xHCI Host Controller"
       ATTRSquirks=="0x0"
       ATTRSremovable=="unknown"
       ATTRSserial=="0000:00:14.0"
       ATTRSspeed=="5000"
       ATTRSurbnum=="101"
       ATTRSversion==" 3.00"

       looking at parent device '/devices/pci0000:00/0000:00:14.0':
       KERNELS=="0000:00:14.0"
       SUBSYSTEMS=="pci"
       DRIVERS=="xhci_hcd"
       ATTRSbroken_parity_status=="0"
       ATTRSclass=="0x0c0330"
       ATTRSconsistent_dma_mask_bits=="64"
       ATTRSd3cold_allowed=="1"
       ATTRSdbc=="disabled"
       ATTRSdevice=="0xa2af"
       ATTRSdma_mask_bits=="64"
       ATTRSdriver_override=="(null)"
       ATTRSenable=="1"
       ATTRSirq=="123"
       ATTRSlocal_cpulist=="0-3"
       ATTRSlocal_cpus=="f"
       ATTRSmsi_bus=="1"
       ATTRSnuma_node=="-1"
       ATTRSrevision=="0x00"
       ATTRSsubsystem_device=="0x310c"
       ATTRSsubsystem_vendor=="0x17aa"
       ATTRSvendor=="0x8086"

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


      Output for sudo udevadm info -ap /devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2:



       looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3/video4linux/video2':
       KERNEL=="video2"
       SUBSYSTEM=="video4linux"
       DRIVER==""
       ATTRdev_debug=="0"
       ATTRindex=="0"
       ATTRname=="Intel(R) RealSense(TM) 415: Int"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1/2-1:1.3':
       KERNELS=="2-1:1.3"
       SUBSYSTEMS=="usb"
       DRIVERS=="uvcvideo"
       ATTRSauthorized=="1"
       ATTRSbAlternateSetting==" 0"
       ATTRSbInterfaceClass=="0e"
       ATTRSbInterfaceNumber=="03"
       ATTRSbInterfaceProtocol=="00"
       ATTRSbInterfaceSubClass=="01"
       ATTRSbNumEndpoints=="00"
       ATTRSiad_bFirstInterface=="03"
       ATTRSiad_bFunctionClass=="0e"
       ATTRSiad_bFunctionProtocol=="00"
       ATTRSiad_bFunctionSubClass=="03"
       ATTRSiad_bInterfaceCount=="02"
       ATTRSinterface=="Intel(R) RealSense(TM) 415 RGB"
       ATTRSsupports_autosuspend=="1"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-1':
       KERNELS=="2-1"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="ef"
       ATTRSbDeviceProtocol=="01"
       ATTRSbDeviceSubClass=="02"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="440mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 5"
       ATTRSbcdDevice=="508f"
       ATTRSbmAttributes=="c0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="2"
       ATTRSdevpath=="1"
       ATTRSidProduct=="0ad3"
       ATTRSidVendor=="8086"
       ATTRSltm_capable=="no"
       ATTRSmanufacturer=="Intel(R) RealSense(TM) 415"
       ATTRSmaxchild=="0"
       ATTRSproduct=="Intel(R) RealSense(TM) 415"
       ATTRSquirks=="0x0"
       ATTRSremovable=="removable"
       ATTRSserial=="736613021813"
       ATTRSspeed=="5000"
       ATTRSurbnum=="56"
       ATTRSversion==" 3.10"

       looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
       KERNELS=="usb2"
       SUBSYSTEMS=="usb"
       DRIVERS=="usb"
       ATTRSauthorized=="1"
       ATTRSauthorized_default=="1"
       ATTRSavoid_reset_quirk=="0"
       ATTRSbConfigurationValue=="1"
       ATTRSbDeviceClass=="09"
       ATTRSbDeviceProtocol=="03"
       ATTRSbDeviceSubClass=="00"
       ATTRSbMaxPacketSize0=="9"
       ATTRSbMaxPower=="0mA"
       ATTRSbNumConfigurations=="1"
       ATTRSbNumInterfaces==" 1"
       ATTRSbcdDevice=="0415"
       ATTRSbmAttributes=="e0"
       ATTRSbusnum=="2"
       ATTRSconfiguration==""
       ATTRSdevnum=="1"
       ATTRSdevpath=="0"
       ATTRSidProduct=="0003"
       ATTRSidVendor=="1d6b"
       ATTRSinterface_authorized_default=="1"
       ATTRSltm_capable=="yes"
       ATTRSmanufacturer=="Linux 4.15.0-36-generic xhci-hcd"
       ATTRSmaxchild=="10"
       ATTRSproduct=="xHCI Host Controller"
       ATTRSquirks=="0x0"
       ATTRSremovable=="unknown"
       ATTRSserial=="0000:00:14.0"
       ATTRSspeed=="5000"
       ATTRSurbnum=="101"
       ATTRSversion==" 3.00"

       looking at parent device '/devices/pci0000:00/0000:00:14.0':
       KERNELS=="0000:00:14.0"
       SUBSYSTEMS=="pci"
       DRIVERS=="xhci_hcd"
       ATTRSbroken_parity_status=="0"
       ATTRSclass=="0x0c0330"
       ATTRSconsistent_dma_mask_bits=="64"
       ATTRSd3cold_allowed=="1"
       ATTRSdbc=="disabled"
       ATTRSdevice=="0xa2af"
       ATTRSdma_mask_bits=="64"
       ATTRSdriver_override=="(null)"
       ATTRSenable=="1"
       ATTRSirq=="123"
       ATTRSlocal_cpulist=="0-3"
       ATTRSlocal_cpus=="f"
       ATTRSmsi_bus=="1"
       ATTRSnuma_node=="-1"
       ATTRSrevision=="0x00"
       ATTRSsubsystem_device=="0x310c"
       ATTRSsubsystem_vendor=="0x17aa"
       ATTRSvendor=="0x8086"

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





      udev video




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