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Re: [Bug-xorriso] bug with handling symbolic links?

From: Joerg Meyer
Subject: Re: [Bug-xorriso] bug with handling symbolic links?
Date: Mon, 16 Feb 2015 13:04:08 +0100

Hi Thomas,

You are amazing - thanks for the ultrafast diagnosis and reply.

> the problem is not specific to BTRFS. I can reproduce it by an ISO generated 
> from ext3.

Good to know - somehow this was my gut feeling about it.
By the way: -disk_dev_ino ino_only (in addition to -md5 on) gives a nice 
speed-up for -update_r ... from different BTRFS snapshots.
This seems to be the least disk space and time-consuming way for archiving such 
snapshots to optical media that I have come up with so far.

> libisofs allocates a single extent for all Continuation Areas
> in a directory. The directory /certs contains lots of links
> with long names. These names fill more than one block.

I see.

> Nevertheless, it is the goal of libisofs (and xorriso) to produce
> Linux-mountable ISOs. So i will have to change libisofs to fulfill
> the (probably incorrect) expectations of Linux.

... and probably also those of iso{info,vfy} from cdr{tools,kit} at the same 
Given the fact these tools do not have linux origin,
perhaps that "unwritten / undocumented interpretation" of the standard 
is (unfortunately) even more widespread?

> If this preliminary diagnosis is right, then the recorded data
> are not damaged and can be retrieved by xorriso commands
>   -osirrox on -extract /certs $HOME/copy_of_certs
P.S. I am not worried about this data - but thanks for the hint!
This might be very important to know for others who encounter such issues for 
actually important files...

Thanks again for your efforts!
Very best wishes,

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