[OE-core] [PATCH 1/2] busybox-mdev: Support automatic mounting of block devices

[Otavio Salvador]

Hello Mike,

On Thu, Dec 18, 2014 at 4:31 AM, Mike Looijmans <mike.looijmans at topic.nl> wrote:
> On 12/17/2014 11:08 PM, Gary Thomas wrote:
>>
>> On 2014-12-17 15:03, Burton, Ross wrote:
>>>
>>> Hi Mike,
>>>
>>> On 5 December 2014 at 09:58, Mike Looijmans <mike.looijmans at topic.nl
>>> <mailto:mike.looijmans at topic.nl>> wrote:
>>>
>>>     Upon inserting a USB stick or similar device, mdev will run
>>>     an automounter script that mounts valid partitions on
>>>     /media/<device>. The script first checks /etc/fstab entries
>>>     so that mounting on UUID or LABEL or using custom mount options
>>>     is still possible. If /etc/fstab does not contain particular
>>>     mount options, the script will create (and remove) the mountpoint
>>>     automatically.
>>>     The script also supports full disk partitions (devices without
>>>     partition table).
>>>
>>>
>>> Thanks for this, but can this script be put into a separate recipe to
>>> make
>>> it even easier for people who don't want it, or want their own version?
>>> The
>>> prior art here is the udev
>>> automounting script which is in udev-extraconf.
...

I didn't try but what happens in mdev if the script does not exists? I
mean keep mdev.conf as is (ready for use) and move the script to
another package which can be installed or not.

> On the satellite settop boxes, /media is a 64k tmpfs mount. This is because
> when a mount fails, the box may end up writing a TV recording to wherever
> /media happens to be. It that's flash or a big tmpfs, the box will commit
> suicide in mere seconds by either filling the flash or eating up the
> precious RAM. And for some things, the box really needs a big tmpfs, so just
> reducing the volatiles' sizes wasn't an option.

Nice 'solution' to avoid a more serious problem :-D

> Having said that, if this is blocking, I'll do a s./media./run/media.g on
> the file, getting this mainlined has higher priority.

I prefer to have it behaving as udev as much as possible, by default.
However, the script could source a defaults file (if it exists) to
change the mounting point for example and allow for those special
systems to be handle without forking.

-- 
Otavio Salvador                             O.S. Systems
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