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Date: Tue, 04 Nov 2014 15:16:13 -0500
From: Jung-uk Kim <jkim@FreeBSD.org>
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To: Dmitry Morozovsky <marck@rinet.ru>, Glen Barber <gjb@freebsd.org>
Subject: Re: svn commit: r274095 - head/release
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On 11/04/2014 14:45, Dmitry Morozovsky wrote:
> On Tue, 4 Nov 2014, Glen Barber wrote:
> 
>> Author: gjb Date: Tue Nov  4 17:24:13 2014 New Revision: 274095 
>> URL: https://svnweb.freebsd.org/changeset/base/274095
>> 
>> Log: Fix VOLUME_LABEL when BRANCH contains non-alpha characters,
>> in particular '-' and '.'.
> 
> [snip]
> 
> By the way, what are original reasons to not allow '-' and '_' in
> volume names?
> 
> It looks a bit inconsistent with other file systems volume
> labels...

AFAIK, it is an ISO9660 limitation, i.e., it must be "d-characters".

http://wiki.osdev.org/ISO_9660#String_format
http://wiki.osdev.org/ISO_9660#The_Primary_Volume_Descriptor

In fact, makefs(8) enforces this rule.

https://svnweb.freebsd.org/base/head/usr.sbin/makefs/cd9660.c?annotate=253707#l343
https://svnweb.freebsd.org/base/head/usr.sbin/makefs/cd9660.c?annotate=253707#l270
https://svnweb.freebsd.org/base/head/usr.sbin/makefs/cd9660/cd9660_strings.c?annotate=219956#l57

Jung-uk Kim
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