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Re: Migrations to xorriso

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: Migrations to xorriso
Date: Wed, 19 May 2010 23:02:42 +0200
User-agent: Mozilla-Thunderbird (X11/20091109)

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
>> 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
> 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
> _______________________________________________
> Grub-devel mailing list
> address@hidden

Vladimir 'φ-coder/phcoder' Serbinenko

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