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Re: grub-mkrescue problems in argp_parse

From: Thomas Schmitt
Subject: Re: grub-mkrescue problems in argp_parse
Date: Mon, 13 Apr 2015 21:10:29 +0200


(i wonder why the original mail from Dietmar Maurer does
 not show up in grub-devel archives or my mailbox)

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".

> 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

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 ?

-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.

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.

Have a nice day :)


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