Re: F24, changing Thunar (Xfce) default archive manager

[Heinz Diehl]

On 25.08.2016, Robert Moskowitz wrote: 

> Now of course, why cannot thunar work as it did in F22?  Well that is for
> some other time...

Frankly, though I've been using XFCE a long time, I don't use
Thunar. In my opinion, Thunar has a bunch of nasty bugs that never get
resolved. I'm perfectly satisfied with Xfe. On one machine, I also use
nautilus without any problems.
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Re: F24, changing Thunar (Xfce) default archive manager

[Robert Moskowitz]

On 08/24/2016 03:20 PM, Heinz Diehl wrote:

On 24.08.2016, Robert Moskowitz wrote:


This shows both xarchiver and engrampa with xarchiver first, and the status
is 'user set'.  I cannot see a way to reverse their order or make engrampa
the default archive manager.

Hmm, maybe you just have to uninstall xarchiver?



Dah, sometimes the obvious is not so obvious!  I don't really need 
xarchiver with engrampa, so...


Did it and things are working as I want them.

Thanks for the simple answer.

Now of course, why cannot thunar work as it did in F22?  Well that is 
for some other time...


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Re: F24, changing Thunar (Xfce) default archive manager

[Heinz Diehl]

On 24.08.2016, Robert Moskowitz wrote: 

> This shows both xarchiver and engrampa with xarchiver first, and the status
> is 'user set'.  I cannot see a way to reverse their order or make engrampa
> the default archive manager.

Hmm, maybe you just have to uninstall xarchiver?
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Re: F24, changing Thunar (Xfce) default archive manager

[Robert Moskowitz]

On 08/22/2016 06:15 PM, Kevin Fenzi wrote:

On Mon, 22 Aug 2016 12:31:20 -0400
Robert Moskowitz  wrote:


I prefer engrampa to xarchiver.  In F22, after a couple times
selecting engrampa from the right click, Thunar just started using it
as the default.  That has not happened in F24 (I download a couple
lectures each day as zips that require using the archive manager
daily).

I looked in preferences for thunar, and no where is there control for
the archive manager.  Nor is there for xfce's default applications.

Anyone with ideas, experiences?

Try xfce4-mime-settings, search for application/zip and set it there?


This shows both xarchiver and engrampa with xarchiver first, and the 
status is 'user set'.  I cannot see a way to reverse their order or make 
engrampa the default archive manager.

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Re: F24, changing Thunar (Xfce) default archive manager

[Tim]

Allegedly, on or about 22 August 2016, Robert Moskowitz sent:
> I prefer engrampa to xarchiver.  In F22, after a couple times selecting 
> engrampa from the right click, Thunar just started using it as the 
> default.  That has not happened in F24 (I download a couple lectures 
> each day as zips that require using the archive manager daily).
> 
> I looked in preferences for thunar, and no where is there control for 
> the archive manager.  Nor is there for xfce's default applications.
> 
> Anyone with ideas, experiences?

I realise this is a lengthy reply, but I'm trying to be thorough.  If
you want a possible quick answer, skip to the last paragraph.

Is the behaviour in question:

a. Following a link in a website/email, and directly opening the file?

b. Opening a file from somewhere on your hard drive (desktop, file
browser window, etc)?

Because (a) is subject to two things.  

1. The delivery system's metadata that says the following data's
mimetype is "something-or-other."  Whatever receives that data, follows
the mimetype directives, rather than inspect the file, itself.  Binary
datatypes are supposed to say what the data is.  For example, a PDF file
could be described either as application/pdf and application/x-pdf (the
x- prefix being an experimental mimetype proposal rather than a ratified
official one), and your client really needs to be able to deal with both
of them correctly (pass the data on to your PDF reader).  It can also be
ambiguously described as application/octet-stream, which simply some
unknown kind of binary, which ought to simply saved, and you have to
deal with the saved file in some other manner.  This mimetype is a
never-ending cause of problems (see further below).

2. The recipient (your software), accepting that data and handling
according to the type of data that it is, as identified by the mimetype,
even if the mimetype is wrong (if you get sent a PDF falsely described
as a JPEG, the software should hand the file to your JPEG viewer, and
let your JPEG view fail to show the data).  It's then up to you to sort
out the problem.

Both halves of the equation have to work properly, transmission and
reception, for data transmission *and* reception to work.  There's just
no avoiding that.  The first half is out of your control, only the
reception part is configurable by you.  You can set up your favourite
PDF viewer, JPEG viewer, etc., and that'll work fine for properly sent
files.  There is no it-will-always-work option for you to deal with
improperly sent data.

On the other hand, with the case for (b), of already stored data, it's
*rather* similar, but not completely.  It goes through the same
processes, but instead of something *outside* telling you what kind of
data is, the system identifies it, *itself*.  It can do it by blind
faith and ignorance, and simply assume that the filename suffix is an
accurate description of the contents.  Many systems work that way, and
it usually works well, until you have some twit save a file with an
inappropriate filename, or think that they can change the kind of data a
file is simply be renaming it.  Or, it can snoop into the file, and look
for telltale signs about what type of data it is.  Some filetypes have
an explicit definition stored at the beginning of themselves, making
that easy.  Others have well-known characteristics that the computer can
look for.  And many systems work that way, too, sometimes as a backup
after failing to work it out from the filename.  Two drawbacks to the
reading into the file method are that it can be computationally
intensive, especially if doing this to a directory full of files, and if
there's a software vulnerability that can be exploited, it's next to
impossible to avoid it.

The application/octet-stream mimetype problem:

As mentioned, it's a generic "this is binary data" header, that does not
identify what kind of data it is, leaving it up to you to determine that
some other way.  There are a great many number of servers which are not
fully configured, so even commonly used data types (like PDF, ZIP,
MPEGs) are not known to it, so it just gives them a generic binary
header that gives little information about the data, other than it
doesn't think it's simply text.  The same goes for many other far less
common types of data (e.g. the plethora of different types of file
archiving and compression formats).

Some people try and work around that by setting their software to always
open this unknown binary as a PDF file, finding that it usually works
okay for them.  But it will fail the next time they get something else
(that's not a PDF) sent with the unknown binary description.

A better solution is to use another program as a handler for unknown
data, let it snoop into the file, and palm it off to what it thinks is
the appropriate program.  There is still one problem with this approach,
though, and that it *may* take away an easy option of saving things you
want to download from a website, as that is 

Re: F24, changing Thunar (Xfce) default archive manager

[Kevin Fenzi]

On Mon, 22 Aug 2016 12:31:20 -0400
Robert Moskowitz  wrote:

> I prefer engrampa to xarchiver.  In F22, after a couple times
> selecting engrampa from the right click, Thunar just started using it
> as the default.  That has not happened in F24 (I download a couple
> lectures each day as zips that require using the archive manager
> daily).
> 
> I looked in preferences for thunar, and no where is there control for 
> the archive manager.  Nor is there for xfce's default applications.
> 
> Anyone with ideas, experiences?

Try xfce4-mime-settings, search for application/zip and set it there? 

kevin


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F24, changing Thunar (Xfce) default archive manager

[Robert Moskowitz]

I prefer engrampa to xarchiver.  In F22, after a couple times selecting 
engrampa from the right click, Thunar just started using it as the 
default.  That has not happened in F24 (I download a couple lectures 
each day as zips that require using the archive manager daily).


I looked in preferences for thunar, and no where is there control for 
the archive manager.  Nor is there for xfce's default applications.


Anyone with ideas, experiences?

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