[arch-releng] [PATCH 1/1] allow to grow devices

Gerardo Exequiel Pozzi vmlinuz386 at yahoo.com.ar
Sun Sep 1 18:36:03 EDT 2013

On 09/01/2013 01:34 PM, Christian Hesse wrote:
> Gerardo Exequiel Pozzi <vmlinuz386 at yahoo.com.ar> on Fri, 2013/08/30 19:17:
>> On 08/30/2013 06:36 PM, Christian Hesse wrote:
>>> Gerardo Exequiel Pozzi <vmlinuz386 at yahoo.com.ar> on Fri, 2013/08/30 13:01:
>>>> On 08/30/2013 06:12 AM, Christian Hesse wrote:
>>>>> Just thinking about how to integrate the userspace tools and handling
>>>>> for this. I would like to add a new hook that adds the binary files
>>>>> (resize2fs, xfs_growfs, btrfs), so anybody can decide whether or not to
>>>>> include. But where do we call this?
>>>> I did not see any real usage of this "extension" inside official image.
>>>> If you are building a custom image build, why not just create a big
>>>> filesystem from the start?
>>> Because bigger filesystem has more metadata. Image size would increase
>>> for a use case I need only very seldom.
>>> I perfer to add some lines of code, having the possibility to grow device
>>> and filesystem when needed.
>> True, but this can be done from another perspective, just create a big
>> file for filesystem, but use few blocks, since squashfs supports sparse
>> files.
>> To do this in the most trivial way is just adding one line to mkarchiso.
>> Let says: truncate -s 16G ${_fs_img} after "mkfs". (or even better!
>> truncate -s 2T ${_fs_img} :D)
> I should have thought of that before... Great idea!

Good :)

> Any chance to get that upstream? I do not want it enabled by default, but
> with a parameter.

Its safe to be enabled by default, without adding additional parameter,
but not in fixed size, I guess at most as double of filesystem size
should be sufficient.

If another parameter should be adeed can be in aitab or via an argument
in mkarchiso.

>> There is only one downside if cowspace should be stored on filesystems
>> that does not support sparse files like FAT cowspace_size= is much more
>> important to be specified now.
> I do not have fat32 for that here, so no problem.
>> This avoid at all this complex logic, what do you think?
> As said before... Great idea. ;) Will give it a test now.

Nice :)

Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1

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