Re: Revert system state to snapshot

[Yevhen Kyriukha <kirgene-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

I think that Sergey's suggestion is great to start with.
Such kind of tool will be the easiest to implement.

The ideal (future) solution I see here is to implement "revert to
snapshot" as VCS implements "revert to commit": when you revert to
specific revision and make some changes then this changes can be
committed in new revision.
In such a way you do not need to change existing data and just append changes.

Best regards,
Yevhen

2013/10/4 Сергей Александров <splavgm@gmail.com>:
> Hello,
>
> Personally for me, it will be great to an utility like this(supporting
> the current utility conventions):
> rvcp cp | ss [device] checkpoint-number
> This should only work on an unmounted partition(else error), cp type
> should be the one set by user (sp | ss),
> The question should be asked that the operation will make all the data
> written after this cp (cp date here) will be unrecoverably lost
> continue any way?[yes/no], requiring full answer.
> After this the FS should be in the state described by this cp and can
> be mounted rw. All cps after given should be eliminated including ss
> cps.
>
> The use case is reverting system state(even the rootfs with the help
> of live cd or live usb) to the previously made ss or existing cp
> without any need of having another hdd, coping data from ro mounted cp
> to the drive and than copying it back. This should ease FS modifying
> related experiments greatly.
>
> Thanks,
> Aleksandrov Sergey
>
> --------------------------------------------------
> Александров Сергей Васильевич
>
>
> 2013/10/4 Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>:
>> Hi Yevhen,
>>
>> On Fri, 2013-10-04 at 15:28 +0300, Yevhen Kyriukha wrote:
>>> Hi!
>>>
>>> I'm wondering how can revert to snapshot by mounting file system as
>>> writable in this state.
>>>
>>> I know that NILFS2 currently doesn't support this feature, but I think
>>> that implementation of such functionality is highly desirable.
>>> Is there any date or estimates when this feature will be implemented?
>>>
>>
>> If you would like to implement this feature then it will be great
>> contribution to the NILFS2 project. You are welcome.
>>
>> Also it can be valuable your vision of this feature. Could you describe
>> what you expect from this feature and how you want to use it? A user's
>> vision is different from developer's vision very frequently.
>>
>> As far as I can judge, we haven't any implementation activity in this
>> direction. If I am not fully informed then Ryusuke corrects me.
>>
>> Thanks,
>> Vyacheslav Dubeyko.
>>
>>
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