Getting QT apps running.

Fri Jul 29 09:19:17 UTC 2016

So I  decided to hack the source of the ipe package in order to get
rid of the path issue possibly causing other problems.

So the updated snapcraft.yaml pulls in "my version" that does not need
a IPEPREFIX any more.
https://github.com/dietmarw/snaps/blob/master/ipe/snapcraft.yaml

But as Timo, I found a couple of other problems. I first tried to only
use the x11 and home plug but then launching ipe  simply does nothing
and sits there until I kill the command. I then tested the unity7 and
home plug. Now I'm getting:

--8<---
$ ipe
ln: failed to create symbolic link
'/home/dietmarw/snap/ipe/x17/.themes/themes': Read-only file system

(process:8847): Gtk-WARNING **: Locale not supported by C library.
Using the fallback 'C' locale.
Gtk-Message: Failed to load module "overlay-scrollbar"
Gtk-Message: Failed to load module "gtk-vector-screenshot"
Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"
Gtk-Message: Failed to load module "unity-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
Qt: Session management error: None of the authentication protocols
specified are supported
[string "require "main""]:1: module 'main' not found:
no field package.preload['main']
no file '/share/ipe/7.2.5/lua/main.lua'
no file '/usr/local/lib/lua/5.2/main.so'
no file '/usr/lib/x86_64-linux-gnu/lua/5.2/main.so'
no file '/usr/lib/lua/5.2/main.so'
no file '/usr/local/lib/lua/5.2/loadall.so'
no file './main.so'
stack traceback:
[C]: in function 'require'
[string "require "main""]:1: in main chunk

---8<----

The main.lua file is actually present

$ tree /snap/ipe/current/share/ipe/7.2.5/lua/
/snap/ipe/current/share/ipe/7.2.5/lua/
├── actions.lua
├── editpath.lua
├── main.lua
├── model.lua
├── mouse.lua
├── prefs.lua
├── properties.lua
├── shortcuts.lua
└── tools.lua

On 29 July 2016 at 09:14, Timo Jyrinki <timo.jyrinki at canonical.com> wrote:
> Changing qt5conf to desktop/qt5 and qt5-launch to desktop-launch does
> not help in ipe's case it seems, even though it gets rid of a few
> warnings.
>
> The problem is with the IPE_PREFIX that ipe requires to be set, and
> I'm also unable to find a combination that would allow ipe to build
> (../../../install works) and ipe to find its main.lua file from the
> correct directory.
>
> It seemed useful to remove the "bin/" prefix though after the changes.
>
> -Timo (snapcraft newbie, testing because Qt mentioned)
>
> On Thu, Jul 28, 2016 at 10:18 PM, Michael Hall <mhall119 at ubuntu.com> wrote:
>> "qt5conf" has been replaced be the newer "desktop/qt5" part and
>> "qt5-launch" replaced by "desktop-launch" in the command. These new
>> desktop launchers have fixed a lot of the common problems that the
>> original qt5conf and gtk-equiqalents ran into.
>>
>>
>> Michael Hall
>> mhall119 at ubuntu.com
>>
>> On 07/28/2016 02:34 PM, Dietmar Winkler wrote:
>>> Hi,
>>>
>>> thanks.  That let me start the app ... almost. I'm now getting:
>>>
>>> $ ipe
>>> Qt: Session management error: None of the authentication protocols
>>> specified are supported
>>> QGtkStyle could not resolve GTK. Make sure you have installed the
>>> proper libraries.
>>> [string "require "main""]:1: module 'main' not found:
>>> no field package.preload['main']
>>> no file '../../../install/share/ipe/7.2.5/lua/main.lua'
>>> no file '/usr/local/lib/lua/5.2/main.so'
>>> no file '/usr/lib/x86_64-linux-gnu/lua/5.2/main.so'
>>> no file '/usr/lib/lua/5.2/main.so'
>>> no file '/usr/local/lib/lua/5.2/loadall.so'
>>> no file './main.so'
>>> stack traceback:
>>> [C]: in function 'require'
>>> [string "require "main""]:1: in main chunk
>>>
>>>
>>>
>>> On 28 July 2016 at 20:21, Kyle Fazzari <kyle.fazzari at canonical.com> wrote:
>>>> On 07/28/2016 11:05 AM, Dietmar Winkler wrote:
>>>>> Hi,
>>>>>
>>>>> when trying to run this "ipe" qt app I got the error message:
>>>>> $ ipe
>>>>> This application failed to start because it could not find or load the
>>>>> Qt platform plugin "xcb".
>>>>>
>>>>> I found out that I need to include the libqt5gui5 package as stage
>>>>> package (just like in the hello-world-desktop example, But even though
>>>>> I added it to my yaml file I still get the same error message.
>>>>>
>>>>> https://github.com/dietmarw/snaps/blob/master/ipe/snapcraft.yaml#L44
>>>>> (I'm actually not sure if I really need the "after: [qt5conf]" part.)
>>>>>
>>>>> So what else am I missing?
>>>>
>>>> The problem is that your application isn't looking in the right place
>>>> for the platform plugins. That's where the qt5conf part comes in handy--
>>>> it includes a launcher script to set that environment for you.
>>>>
>>>> You need to use the launcher from the qt5conf part in order to launch
>>>> the app.
>>>>
>>>> apps:
>>>>   ipe:
>>>>     command: bin/ipe
>>>>
>>>> Needs to be:
>>>>
>>>> apps:
>>>>   ipe:
>>>>     command: qt5-launch bin/ipe
>>>>
>>>> And so on.
>>>>
>>>> --
>>>> Kyle Fazzari (kyrofa)
>>>> Software Engineer
>>>> Canonical Ltd.
>>>> kyle at canonical.com
>>>>
>>>>
>>>> --
>>>> Snapcraft mailing list
>>>> Snapcraft at lists.snapcraft.io
>>>> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/snapcraft
>>>>
>>>
>>>
>>>
>>
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>
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-- 
Dietmar Winkler, Assistant professor
University College of Southeast Norway
Faculty of Technology
Campus: Porsgrunn

http://me.dwe.no

Kjølnes ring 56, 3918 Porsgrunn, Norway