CentOS - Feb 2016 - Changing default file type in Centos 6

On 2016-02-27, Frank Cox
<theatre at melvilletheatre.com> wrote:
> On Sat, 27 Feb 2016 16:33:00 -0500 H wrote:
>
>> No, that I already did. I am talking about the file type when you
>> open a graphical directory window.
>
> I'm missing something here.  Do you mean that you want to change icon
> that shows up in a Nautilus window for a particular filetype?
>
I think the OP is talking about the file type that Nautilus reports when
you right-click on a file and bring up the 'Properties' dialog.

In my case (also CentOS 6) Naulitus reports 'Genesis ROM' for files with
the .md extension. The file command, on the other hand, reports 'ASCII
English text'.

The file responsible for the behaviour of Nautilus is
/usr/share/mime/application/x-genesis-rom.xml, which appears to have
been generated by update-mime-database.

-- 

Liam

On 02/28/2016 12:27 AM, Liam O'Toole wrote:
> On 2016-02-27, Frank Cox
> <theatre at melvilletheatre.com> wrote:
>> On Sat, 27 Feb 2016 16:33:00 -0500 H wrote:
>>
>>> No, that I already did. I am talking about the file type when you
>>> open a graphical directory window.
>> I'm missing something here.  Do you mean that you want to change
icon
>> that shows up in a Nautilus window for a particular filetype?
>>
> I think the OP is talking about the file type that Nautilus reports when
> you right-click on a file and bring up the 'Properties' dialog.
>
> In my case (also CentOS 6) Naulitus reports 'Genesis ROM' for files
with
> the .md extension. The file command, on the other hand, reports 'ASCII
> English text'.
>
> The file responsible for the behaviour of Nautilus is
> /usr/share/mime/application/x-genesis-rom.xml, which appears to have
> been generated by update-mime-database.
>
Correct. I looked at that file and it says "created automatically by 
update-mime-database. do not edit" which begs the question: how can I 
"correct this?"

On Sun, 28 Feb 2016 15:37, H wrote:
> On 02/28/2016 12:27 AM, Liam O'Toole wrote:
>>  On 2016-02-27, Frank Cox wrote:
>> >  On Sat, 27 Feb 2016 16:33:00 -0500 H wrote:
>> > 
>> > >  No, that I already did. I am talking about the file type
when you
>> > >  open a graphical directory window.
>> >  I'm missing something here.  Do you mean that you want to
change icon
>> >  that shows up in a Nautilus window for a particular filetype?
>> >
>>  I think the OP is talking about the file type that Nautilus reports
when
>>  you right-click on a file and bring up the 'Properties'
dialog.
>>
>>  In my case (also CentOS 6) Naulitus reports 'Genesis ROM' for
files with
>>  the .md extension. The file command, on the other hand, reports
'ASCII
>>  English text'.
>>
>>  The file responsible for the behaviour of Nautilus is
>>  /usr/share/mime/application/x-genesis-rom.xml, which appears to have
>>  been generated by update-mime-database.
>> 
> Correct. I looked at that file and it says "created automatically by 
> update-mime-database. do not edit" which begs the question: how can I
"correct
> this?"
IMHO something is fishy in your install here.

/usr/share/mime/application/x-genesis-rom.xml is generated from:
/usr/share/mime/packages/freedesktop.org.xml by the
update-mime-database tool


for "Genesis ROM" the glob pattern="*.gen" is set and
as well as the "magic"  patterns:
       match value="SEGA" type="string"
offset="256"
       match value="EAGN" type="string"
offset="640"
       match value="EAMG" type="string"
offset="640"


Just how are your "text/markdown", glob pattern="*.md" files
"discovered" as "Genesis ROM" ??

Eitherway,

to disable the future creation of the file:
/usr/share/mime/application/x-genesis-rom.xml
you have to comment out the relevant section in:
/usr/share/mime/packages/freedesktop.org.xml

then remove /usr/share/mime/application/x-genesis-rom.xml
and run the update-mime-database as root.

Be aware, future updates of the file:
  /usr/share/mime/packages/freedesktop.org.xml
will re-enable the application/x-genesis-rom mime-type.

Have a nice sunday
  - Yamaban.