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To: Nathan Kinkade <nkinkade@ub.edu.bz>
References: <20040311103035.GA95376@ns2.wananchi.com>
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Date: 12 Mar 2004 09:21:33 -0500
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Subject: Re: mount an ISO image on rw mode
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Nathan Kinkade <nkinkade@ub.edu.bz> writes:

> On Thu, Mar 11, 2004 at 01:30:35PM +0300, Odhiambo Washington wrote:
> > Hello users,
> > 
> > Perhaps I am just being stupid, doing a lot of things at the same time,
> > thus losing it.
> > Am I just dreaming by imagining that I can mount an ISO image with write
> > access?
> > 
> > I have done
> > 
> > [root@ns2]#vnconfig /dev/vn0c /wananchi/FreeSBIE-1.0-i386.iso
> > [root@ns2]#mount_cd9660 /dev/vn0c /freesbie
> > 
> > This mounts the image in read-only mode. However, I would like to modify
> > a few files on the image before writing it to a CD.
> > 
> > The man page for mount says that I could use -o -w to achieve a write
> > mode. Does this also apply to ISO iamages? I was thinking that once
> > mounted, they should behave like regular files, no?
> > 
> > -Wash
> 
> I don't have an answer to this, but wanted to chime in because I have
> had the same issue in the past.  I had once heard a friend tell me that
> he used to create ISO images in this very way in Linux by mounting an
> ISO image on a (Linux) loop device and then copy files to the image.  It
> seems like it could be a flexible and convenient way to quickly create
> an ISO image at random, but I've never been able to get FreeBSD to mount
> and ISO image rw using either vnconfig or mdconfig.  Maybe there are
> some practical considerations that we are overlooking?

The only way I can think of to do that would potentially re-write the
entire ISO image on every write...