From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <71b71c44e52ebee2139ca4d27985f181@plan9.bell-labs.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Permissions, again
From: rsc@plan9.bell-labs.com
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Date: Wed, 15 May 2002 14:20:17 -0400
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> I presume that the ISO image was generated in some fashion and I
> haven't yet found out how, so please illuminate me, but mostly I'd

mk9660(8)

> be very excited to discover that 9660srv can modify an ISO image
> and retain its structure successfully, if it needs some work and
> someone wants to guide me, I'll happily help.  I did note that the
> 4ed version has some undeployed code for "removing" files where
> the 3ed version has just the "not supported" message.

This is basically impossible.  9660srv contains no provisions
for editing the file system.  ISO 9660 is very strongly meant
to be read-only.  Every file and directory is required to be laid
out as a contiguous byte sequence.  Thus, growing one would
require moving it to the end of the CD (which would leave unused
space where the file had been) or sliding the rest of the data
on the CD and fixing all the offsets.  Nothing's really impossible,
but this is just a royal pain.

You'd be much better off copying the contents of the CD to your
kfs and editing things there.

Russ