Re: Migrations to xorriso

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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Thomas Schmitt wrote:
> Hi,
>
>   
>>> - Option --diet saves about 400 kB of image
>>>   size without losing much benefit.
>>>       
>> If it doesn't lose much,
>> why would it not be the default?
>>     
>
> Maybe one should revert the default and offer
> an option
>   --multi-session-toc
> instead ?
>
>   
As said in another mail size saving matters only for floppy. Otherwise I
prefer the most standard way possible
>   
>>  Or, put another way, why would
>> somebody want to turn this option off?
>>     
>
> I could want a bootable multi-session backup
> on USB stick with the opportunity to mount the
> backup state of two weeks ago.
> For that i'd start with a rescue system created
> by grub-mkrescue, add my base backup as second
> session and daily updates as further sessions.
>
>
> The extra 64 kB to 126 kB make sure that the
> older sessions of a multi-session ISO image can
> be detected and mounted. Useful with incremental
> backups on regular files, USB sticks, DVD+RW or
> BD-RE media.
> But not so much of interest with a single session
> rescue image.
>
> Without this extra space one can still add new
> sessions but will always see the youngest one as
> the only session of the image. (growisofs does
> it that way.)
> If the first session ends up on sequential media
> (CD-R[W], DVD-R, DVD+R, BD-R) then further
> multi-session will be managed by the drive
> anyway.
>
>
>   
Puppy linux does that. I think it's sensible. However it's up to
distributors and individual users whether to make advantage of such
features.
>> Useless use of cat.
>>     
>
> Not in this case. xorriso calls fstat(2) to
> determine the semantics of the given output file.
> Option -o "${output_image}" or a redirection
> by >"${output_image}" would both reveil type
> S_IFREG.
> But for the diet case i want S_ISCHR or S_IFIFO
> so that the output "media" appears as sequential
> rather than as overwriteable.
>
>
> Have a nice day :)
>
> Thomas
>
>
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>
>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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