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Re: grub-mkrescue problems in argp_parse

From: Dietmar Maurer
Subject: Re: grub-mkrescue problems in argp_parse
Date: Tue, 14 Apr 2015 09:23:26 +0200 (CEST)

> Dietmar Maurer wrote:
> > > After reverting the following commit everything works again:
> > >
> Andrei Borzenkov wrote:
> > It chokes on -V which is "display version and exit" in argp.
> Alternative -as mkisofs option:  -volid 'PVE'
> With old grub-mkrescue(.in) of 1.99, the version option was -v,
> which would collide with the -as mkisofs option which has as alias
> the word "-verbose".

OK, that works - thanks!

> > I still
> > believe this patch was mistake; it leaves no possibility to
> > disambiguate between grub and external options.
> So we are back at the reasons why i proposed to introduce
> a new tool  grub-mkiso.c  with clear distinction of arguments
> for grub-mkiso and xorriso, and to have an artlessly implemented
> but high-fidelity compatibility mode for emulating old
> grub-mkrescue(.in).

It is quite easy to detect if there is a '--' in the argument list.
So you could disable magic code if you find '--'?

> My proposal of such an artless shell-to-C translation is posted as
> (Dietmar's command line would be for new grub-mkiso then.)
> ----------------------------------------------------------------
> Some xorriso musings:
> Dietmar Maurer wrote:
> > > # grub-mkrescue -o pve-cd.iso data-gz -- -z -r -V 'PVE' -c boot/
> > > -isohybrid-gpt-basdat -partition_offset 16 -c boot/
> This seems to be mangled a bit. Especially the double
> option -c. Were there more options ?

This was just a mistake.

> -isohybrid-gpt-basdat might collide with xorriso options
> used by grub-mkrescue. (It is intended for ISOLINUX/GRUB2
> BIOS/EFI hybrids. E.g. debian-7.7.0-amd64-netinst.iso.)
> -partition_offset 16 is not really compliant with UEFI specs,
> which prescribe a single MBR partition starting at block 1,
> if GPT is present.
> The whole ISOLINUX/GRUB2 isohybrid world does not care about
> that prescription. But grub-mkrescue does.

OK, I will try without those options.
> To save some intermediate disk space:
> The generic xorriso command
>   -set_filter_r --zisofs --
> can do the mkzftree(1) compression on the fly, if libz is
> linked in.

Many thanks for your help.

- Dietmar

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