Re: [Libcdio-devel] Rock Ridge and libisofs/xorriso 'AL' extension

[Pete Batard]

On 2017.07.25 12:49, Thomas Schmitt wrote:
> That would be "original research" which Wikipedia forbids.

Hopefully, I shared my views on that in my other reply. ;)

> I use the prepared extension opportunity of SUSP. Any SUSP compliant
> software should have no problem with this.

Agreed.

> Further it was the decision of Kali developers to record the device and
> inode numbers of the input files on hard disk.
> (Possibly by xorrisofs option --hardlinks, if not by xorriso command
>   -disk_dev_ino.)
> In a Debian ISO i do not get any match from
>
>    xorriso -indev $iso -find / -has_any_xattr -exec get_any_xattr --
>
> So AAIP in published distro ISOs is rather exotic. Neither fast
> incremental backup preparations nor hardlink recording are of much use
> in an installation ISO. Hardlinks rather serve for high backup fidelity.

Okay. I can try to get back to the Kali maintainers on that, but I'm not 
sure how much they're gonna like being asked about this for the 3rd time 
in a row...

> You can ask me about ISO 9660 at any time on e.g. address@hidden
> (or via address@hidden if it's somewhat confidential).

Thanks. In retrospect, it's clear I should have hit this mailing list as 
soon as I found about 'AL' being used But I was hoping the Kali people 
could point me in the right direction first.

> The Wikipedia article structure is misleading. SUSP is the boss of
> Rock Ridge, not a part of it.

Would you have a conflict of interest in editing the pages that aren't 
related to AAIP and 'AL'? As far as I'm concerned, technical Wikipedia 
topics are better left to the person with the most expertise on the 
matter, regardless of the conflicts of interest Wikipedia moderators 
fear they might bring... ;)

> In any case, AAIP belongs to the paragraph "Variants", where Amiga is
> mentioned.

Yeah, I wondered about that too... But I wasn't clear whether AAIP was 
to be considered as a something that might fall outside established 
standards. I'll see if I can edit this when I get a chance.

> Further, AAIP does not only record ACL but arbitrary extended file
> attributes.

Yup, I got that. But this is a one line entry in a Wikipedia article, so 
I didn't want to go into too much details.

> > I'm attaching a patch proposal for review, which I'll be happy to commit to
> > libcdio if everyone agrees.
>
> I think we should first re-investigate the bug which led to the
> list of known SUSP entry names, which by the triggered program reaction
> actually violates the specs.

Ack. I think your reply a few minutes after that patch proposal made it 
clear that it should be off the table for now.

> It would be interesting to see the xorriso command line they use.

Well, since I was talking about this issue with some other people, who 
mentioned this specific item to me, I'll take that as a cue to point out 
that, from what they reported, xorriso and genisoimage decided to drop 
what they considered one of the most useful feature from mkisofs, which 
was to store the options being passed to the commandline application 
into the ISO itself.

I guess we sure wouldn't mind if that feature had found its way into the 
new utilities right now... Maybe something that could be added to 
xorriso in the future? ;)

Of course, this doesn't help us much for the time being, and yeah, I was 
hoping that the Kali people would also be able to give me the command 
line they used for ISO generation, and spared a lot of information 
digging, when I logged that issue with them...

> Trying to read e.g.
>    
> http://git.kali.org/gitweb/?p=live-build-config.git;a=blob;f=build.sh;h=e97709799b9408374777895f5cbedbd9098886a3;hb=HEAD

I'm not sure there's much to find in live-build-config. I've done just 
that when trying to see if I could figure out the Kali ISO generation 
command, and it just seems to invoke another set of commands that come 
from the system and not the git repo. I didn't push it further at the 
time, as I didn't want to have to go through a Kali install on a VM...

Still if you're interested, here's a web accessible clone of the latest 
git version:
http://files.akeo.ie/live-build-config/

Regards,

/Pete