Aqui está o que estou tentando realizar com uma regra do udev. Talvez eu precise de mais de um.
Eu tenho um cartão micro-sd que eu insiro em um adaptador usb. Este cartão tem várias partições. Eu quero ter um /dev/sdcard que aponta para a raiz do cartão quando ele é inserido. Eu também quero que o grupo do dispositivo seja configurado para um grupo específico.
Assim, meu card pode ter /dev/sdd , /dev/sdd1 , /dev/sdd2
Eu quero que /dev/sdcard aponte para /dev/sdd
Aqui está a regra que estou usando no momento.
ATTRS{removable}=="1",SUBSYSTEMS=="block",SYMLINK+="sdcard",GROUP="rawdisk"
No momento, o grupo de /dev/sdd foi alterado corretamente para rawdisk .
$ ls -la /dev/sdd
brw-rw---- 1 root rawdisk 8, 48 Apr 19 14:51 /dev/sdd
No entanto, /dev/sdcard aponta para /dev/sdd2 em vez de /dev/sdd
$ ls -la /dev/sdcard
lrwxrwxrwx 1 root root 4 Apr 19 14:51 /dev/sdcard -> sdd2
E remover o cartão não remove /dev/sdcard
$ udevadm info --name=/dev/sdd --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/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.1/host4/target4:0:0/4:0:0:2/block/sdd':
KERNEL=="sdd"
SUBSYSTEM=="block"
DRIVER==""
ATTR{ro}=="0"
ATTR{size}=="0"
ATTR{stat}==" 3815 2182 44808 49392 16 0 128 2028 0 28516 51416"
ATTR{range}=="16"
ATTR{discard_alignment}=="0"
ATTR{events}=="media_change"
ATTR{ext_range}=="256"
ATTR{events_poll_msecs}=="2000"
ATTR{alignment_offset}=="0"
ATTR{inflight}==" 0 0"
ATTR{removable}=="1"
ATTR{capability}=="51"
ATTR{events_async}==""
looking at parent device '/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.1/host4/target4:0:0/4:0:0:2':
KERNELS=="4:0:0:2"
SUBSYSTEMS=="scsi"
DRIVERS=="sd"
ATTRS{rev}=="1.00"
ATTRS{type}=="0"
ATTRS{scsi_level}=="0"
ATTRS{model}=="SD/MMC "
ATTRS{state}=="running"
ATTRS{queue_type}=="none"
ATTRS{iodone_cnt}=="0x2ad5"
ATTRS{iorequest_cnt}=="0x2ad5"
ATTRS{device_busy}=="0"
ATTRS{evt_capacity_change_reported}=="0"
ATTRS{timeout}=="30"
ATTRS{evt_media_change}=="0"
ATTRS{max_sectors}=="240"
ATTRS{ioerr_cnt}=="0xf6"
ATTRS{queue_depth}=="1"
ATTRS{vendor}=="Generic-"
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{dh_state}=="detached"
ATTRS{iocounterbits}=="32"
ATTRS{inquiry}==""
ATTRS{eh_timeout}=="10"
looking at parent device '/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.1/host4/target4:0:0':
KERNELS=="target4:0:0"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.1/host4':
KERNELS=="host4"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:0b.0/usb1/1-1/1-1:1.1':
KERNELS=="1-1:1.1"
SUBSYSTEMS=="usb"
DRIVERS=="usb-storage"
ATTRS{bInterfaceClass}=="08"
ATTRS{bInterfaceSubClass}=="06"
ATTRS{bInterfaceProtocol}=="50"
ATTRS{bNumEndpoints}=="02"
ATTRS{authorized}=="1"
ATTRS{supports_autosuspend}=="1"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bInterfaceNumber}=="01"
ATTRS{interface}=="Bulk-In, Bulk-Out, Interface"
looking at parent device '/devices/pci0000:00/0000:00:0b.0/usb1/1-1':
KERNELS=="1-1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{devpath}=="1"
ATTRS{idVendor}=="0bda"
ATTRS{speed}=="480"
ATTRS{bNumInterfaces}==" 2"
ATTRS{bConfigurationValue}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{busnum}=="1"
ATTRS{devnum}=="3"
ATTRS{configuration}=="CARD READER"
ATTRS{bMaxPower}=="500mA"
ATTRS{authorized}=="1"
ATTRS{bmAttributes}=="80"
ATTRS{bNumConfigurations}=="1"
ATTRS{maxchild}=="0"
ATTRS{bcdDevice}=="6123"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{quirks}=="0x0"
ATTRS{serial}=="20070818000000000"
ATTRS{version}==" 2.00"
ATTRS{urbnum}=="126995"
ATTRS{ltm_capable}=="no"
ATTRS{manufacturer}=="Generic"
ATTRS{removable}=="unknown"
ATTRS{idProduct}=="0161"
ATTRS{bDeviceClass}=="00"
ATTRS{product}=="USB2.0-CRW"
looking at parent device '/devices/pci0000:00/0000:00:0b.0/usb1':
KERNELS=="usb1"
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}=="1"
ATTRS{devnum}=="1"
ATTRS{configuration}==""
ATTRS{bMaxPower}=="0mA"
ATTRS{authorized}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bNumConfigurations}=="1"
ATTRS{maxchild}=="12"
ATTRS{interface_authorized_default}=="1"
ATTRS{bcdDevice}=="0404"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{quirks}=="0x0"
ATTRS{serial}=="0000:00:0b.0"
ATTRS{version}==" 2.00"
ATTRS{urbnum}=="101"
ATTRS{ltm_capable}=="no"
ATTRS{manufacturer}=="Linux 4.4.0-116-generic ehci_hcd"
ATTRS{removable}=="unknown"
ATTRS{idProduct}=="0002"
ATTRS{bDeviceClass}=="09"
ATTRS{product}=="EHCI Host Controller"
looking at parent device '/devices/pci0000:00/0000:00:0b.0':
KERNELS=="0000:00:0b.0"
SUBSYSTEMS=="pci"
DRIVERS=="ehci-pci"
ATTRS{irq}=="19"
ATTRS{subsystem_vendor}=="0x0000"
ATTRS{broken_parity_status}=="0"
ATTRS{class}=="0x0c0320"
ATTRS{companion}==""
ATTRS{driver_override}=="(null)"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{dma_mask_bits}=="32"
ATTRS{local_cpus}=="f"
ATTRS{device}=="0x265c"
ATTRS{uframe_periodic_max}=="100"
ATTRS{enable}=="1"
ATTRS{msi_bus}=="1"
ATTRS{local_cpulist}=="0-3"
ATTRS{vendor}=="0x8086"
ATTRS{subsystem_device}=="0x0000"
ATTRS{numa_node}=="-1"
ATTRS{d3cold_allowed}=="0"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
A regra é muito genérica e corresponde a todos os nós / dev / sdd, / dev / sdd1, / dev / sdd2. Ele corresponde ao dispositivo de bloco e seus nós de partições.
Então, udev:
Veja esta regra:
ATTR{removable}=="1",SUBSYSTEM=="block",DRIVERS=="sd",SYMLINK+="sdcard",GROUP="rawdisk"
Note que substituí SUBSYSTEMS, ATTRS por SUBSYSTEM, ATTR.