Date: Fri, 31 Dec 1999 17:37:37 +1100 From: "Shaun Amy, CSIRO TIP/ATNF" <amy@explorer.tip.CSIRO.AU> To: Peter Wemm <peter@netplex.com.au> Cc: freebsd-hackers@freebsd.org Subject: Re: CD-RW long filenames/rw filesystem. Message-ID: <199912310637.RAA16415@explorer.tip.CSIRO.AU> In-Reply-To: Your message of "Fri, 31 Dec 1999 12:53:07 %2B0800." <19991231045307.1749B1CA0@overcee.netplex.com.au>
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>"Shaun Amy, CSIRO TIP/ATNF" wrote:
>> >A couple weeks ago I got a CD-RW drive, and decided to try it out under
>> >all the different OS's I use. In FreeBSD, the only way (it seems) to use
>> >it, is grab a bunch of stuff you want to backup/record and use mkisofs and
>> >cdrecord to dump it onto a CD. Everything I read seemed to indicate that
>> >this method limits you to the 8.3 filename format of iso9660 and all
>> >Rockridge does is add file/group permissions and ownership. is there any
>> >CD recording utilities/formats that can do long filenames (hopefully with
>> >Unix permissions)?
>>
>> This is not correct. The initial ISO9660 standard did specify the 8.3 forma
>t
>> but there are now extensions that do what you describe. Recent versions of
>> "mkisofs" support RockRidge (long filename under UNIX support) and Joliet
>> (MS long filename support) so you are not restricted to the 8.3 format. I
>> wrote a couple of CDs the other day under FreeBSD (3.4-STABLE) using
>> "mkisofs" with RockRidge support and the long filenames work fine. As this
>> was data from a UNIX system I wasn't concerned with Windows support.
>
>Not quite. According to mkisofs(1):
>
> -l Allow full 32 character filenames. Normally the
> ISO9660 filename will be in an 8.3 format which is
> compatible with MS-DOS, even though the ISO9660
> standard allows filenames of up to 32 characters.
> If you use this option, the disc may be difficult
> to use on a MS-DOS system, but this comes in handy
> on some other systems (such as the Amiga). Use
> with caution.
>
>It's depressing to see just how long the legacy of MS-DOS persists. :-(
>The ISO9660 format supports 32 chars, but since nearly everything uses 8.3
>to be readable by MSCDEX and windoze, the 32 character names are rarely
>implemented or well tested.
Ah, I was thinking along the lines of:
-J Generate Joliet directory records in addition to
regular iso9660 file names. This is primarily use-
ful when the discs are to be used on Windows-NT or
Windows-95 machines. The Joliet filenames are
specified in Unicode and each path component can be
up to 64 Unicode characters long.
and
-R Generate SUSP and RR records using the Rock Ridge
protocol to further describe the files on the
iso9660 filesystem.
-r This is like the -R option, but file ownership and
modes are set to more useful values. The uid and
gid are set to zero, because they are usually only
useful on the author's system, and not useful to
the client. All the file read bits are set true,
so that files and directories are globally readable
on the client. If any execute bit is set for a
file, set all of the execute bits, so that executa-
bles are globally executable on the client. If any
search bit is set for a directory, set all of the
search bits, so that directories are globally
searchable on the client. All write bits are
cleared, because the CD-Rom will be mounted read-
only in any case. If any of the special mode bits
are set, clear them, because file locks are not
useful on a read-only file system, and set-id bits
are not desirable for uid 0 or gid 0.
This is from the man page for 1.12b5 of "mkisofs", which does have a rather
large number of options :-)
So you may well be correct Peter and probably have a lot more experience
than I do with this having only had a CD-R/CD-RW for a bit over a week on my
home systems although we have had them for some time at work.
Regards, Shaun.
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