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Re: Bug report: The auto-props setting of svn:mime-type is impossible to avoid.

From: Branko ─îibej <brane_at_apache.org>
Date: Sun, 4 Oct 2015 21:16:04 +0200

On 04.10.2015 11:35, Ivan Zhakov wrote:
> On 2 October 2015 at 11:06, Edward d'Auvergne <true.bugman_at_gmail.com> wrote:
>> Hi all,
>> I was wondering if this should be considered a bug. At the FlightGear
>> project we have a 6 GB data svn repository for aircraft (
>> https://sourceforge.net/projects/flightgear/ ,
>> https://sourceforge.net/p/flightgear/fgaddon/HEAD/tree/ ). A large
>> quantity of the files, almost 30,000 in number, are XML text files.
>> The problem is that modern Subversion clients appear to all be using
>> libmagic to determine the file type, to then set the svn:mime-type
>> property. However this is rather problematic:
>> $ file -ib Aircraft/747-400/747-400-set.xml
>> application/xml; charset=us-ascii
>> Libmagic detects all these XML files as "application/xml". Hence they
>> are treated as binary files! There are many other text files with
>> extensions such as *.ac, *.nas, etc. present in the repository that in
>> the future might be detected by libmagic as "application/xyz".
> Easy fix would be change svn_mime_type_is_binary() to consider
> 'application/xml' as text file. We can also extend for other specific
> application/* mimetypes that are text files. We already have special
> handling for 'image/x-xbitmap' to consider it as text file.
> Does it make sense?

Please let's not have that discussion again. A quick search of the
archives will show that we've talked this idea to death already.

To summarize: To Subversion, "text" implies that you can do textual
diff/merge with the contents. With XML, that may sometimes work, but
usually won't. And the problem doesn't stop with 'application/xml'
because there are literally hundreds of media types for documents that
use XML.

On the other hand, I am surprised that the logic that uses libmagic
isn't turned off with 'enable-auto-props=no'. After all, using libmagic
is just a convenient extension to the definitions in the [auto-props]

-- Brane
Received on 2015-10-04 21:16:10 CEST

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