Cannot pass --device=/dev/disk3 on macOS into Linux Docker?

Question

Cannot pass --device=/dev/disk3 on macOS into Linux Docker?

kenorb opened this issue 6 years ago · 9 comments

I have tried with the latest version of my channel (Stable or Edge)
I have uploaded Diagnostics
Diagnostics ID: D1F5CC9C-9C89-4621-8781-F9AC7308134F

Expected behavior

I'd like to pass /dev/disk3 device into Docker, so I'm running the following command:

docker run -it --device=/dev/disk3 --privileged ubuntu bash

or:

docker run -it --device=/dev/disk3:/dev/sdb --privileged ubuntu bash

then I expect to have access to this device inside the container, so it can be mounted (as ext4 in this case).

Actual behavior

$ docker run -it --device=/dev/disk3 --privileged ubuntu bash
# ls /dev/disk3
ls: cannot access '/dev/disk3': No such file or directory
# fdisk -l
Disk /dev/sda: 59.6 GiB, 63999836160 bytes, 124999680 sectors
Device     Boot Start       End   Sectors  Size Id Type
/dev/sda1  *     2048 124999679 124997632 59.6G 83 Linux

Another attempt:

$ docker run -it --device=/dev/disk3:/dev/sdb --privileged ubuntu bash
# ls /dev/sdb*
ls: cannot access '/dev/sdb*': No such file or directory
# fdisk -l
Disk /dev/sda: 59.6 GiB, 63999836160 bytes, 124999680 sectors
Device     Boot Start       End   Sectors  Size Id Type
/dev/sda1  *     2048 124999679 124997632 59.6G 83 Linux

The device is present on the macOS host:

$ diskutil list /dev/disk3
/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *1.0 TB     disk3
   1:                      Linux                         1.0 TB     disk3s1

$ sudo fdisk /dev/disk3
Disk: /dev/disk3    geometry: 121601/255/63 [1953525167 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: 83 1023 254  63 - 1023 254  63 [         2 - 1953525165] Linux files*
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused

but it's not present in the container after passing through --device parameter.

Information

macOS Version: 10.13.5
Engine: 18.03.1-ce
Compose: 1.21.1
Machine: 0.14.0

It's reproducible each time.

Diagnostic logs

No errors reported in the logs

Steps to reproduce the behavior

Connect external USD HDD formatted with FS not readable by macOS, so it cannot be mounted, such as ext4.
Run docker run -it --device=/dev/disk3 --privileged ubuntu bash (where /dev/disk3 is your device number on the host).

Expected behavior

Actual behavior

Information

Diagnostic logs

Steps to reproduce the behavior

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