ubuntu-phone team mailing list archive

[Dmitrijs Ledkovs <xnox@xxxxxxxxxx>]

On 13 September 2013 19:20, Gustavo Niemeyer <gustavo@xxxxxxxxxxxx> wrote:
> Some of the overlay filesystems do support writing tomb markers to
> handle deletions as well. I'm sure you know that, though, so I'm
> mostly wondering why that was not a good option?  Performance?
>

Ubuntu Touch images are not using any overlay filesystems. Just
read-only and writeable mounts, with loop/bind mounts as needed.
And we cannot easily support overlay filesystems since they are often
not present in the target device kernels.

Regards,

Dmitrijs.


> On Fri, Sep 13, 2013 at 3:15 PM, Oliver Grawert <ogra@xxxxxxxxxx> wrote:
>> On Fri, 13 Sep 2013 17:42:36 +0200
>> Michael Zanetti <michael.zanetti@xxxxxxxxxxxxx> wrote:
>>
>>> On Friday 13 September 2013 17:33:47 Oliver Grawert wrote:
>>> > it is currently not possible to switch on ssh in a persistent way, but with
>>> > the next image in the daily-proposed channel (build number >46) this should
>>> > be fixed. due to the nature of the readonly image you can not just remove
>>> > the .override file but instead will have to empty it to make it not take
>>> > effect:
>>> >
>>> > echo | sudo tee /etc/init/ssh.override
>>>
>>> At the risk of blaming myself... How come I cannot delete, but still modify a
>>> file on a read only file system? I mean... modifying a file is still write
>>> operation, no?
>>
>> writability of files on the ro image is achieved by bind mounting the files from the ro side to a writable area of the filesystem ... if you delete it, it will just come back on next boot since the bind mount is newly created ...
>>
>> which is kind of defeating the purpose :)
>>
>> ciao
>>         oli
>>
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>
>
>
> --
>
> gustavo @ http://niemeyer.net
>
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