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config-linux: Add restriction for duplicated device path #647

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mrunalp merged 1 commit into from
Jan 12, 2017
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config-linux: Add restriction for duplicated device path #647

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4 changes: 4 additions & 0 deletions config-linux.md
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Expand Up @@ -115,12 +115,15 @@ Each entry has the following structure:
* **`type`** *(string, REQUIRED)* - type of device: `c`, `b`, `u` or `p`.
More info in [mknod(1)][mknod.1].
* **`path`** *(string, REQUIRED)* - full path to device inside container.
If a [file][file.1] already exists at `path` that does not match the requested device, the runtime MUST generate an error.
* **`major, minor`** *(int64, REQUIRED unless **`type`** is `p`)* - [major, minor numbers][devices] for the device.
* **`fileMode`** *(uint32, OPTIONAL)* - file mode for the device.
You can also control access to devices [with cgroups](#device-whitelist).
* **`uid`** *(uint32, OPTIONAL)* - id of device owner.
* **`gid`** *(uint32, OPTIONAL)* - id of device group.

The same `type`, `major` and `minor` SHOULD NOT be used for multiple devices.

###### Example

```json
Expand Down Expand Up @@ -608,6 +611,7 @@ The values MUST be absolute paths in the [container namespace][container-namespa
[cgroup-v2]: https://www.kernel.org/doc/Documentation/cgroup-v2.txt
[devices]: https://www.kernel.org/doc/Documentation/devices.txt
[devpts]: https://www.kernel.org/doc/Documentation/filesystems/devpts.txt
[file.1]: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_164

[mknod.1]: http://man7.org/linux/man-pages/man1/mknod.1.html
[mknod.2]: http://man7.org/linux/man-pages/man2/mknod.2.html
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