snap integration with XFCE

[Eloy García (PC Actual)]

Hi Didier!

Thanks as always for your answer and feedback :) I suspected it and I was
taking a look to desktop launcher source code on github, but I didn't have
time to test it. One question: Can I create the symblink when the snap
application is executed (after installation) via the script that i use to
wrap up the launching process or will I have problems to do that because of
the confinement?

Best,

Eloy

2016-10-24 10:14 GMT+02:00 Didier Roche <didrocks at ubuntu.com>:

> Le 06/10/2016 à 21:34, Eloy García (PC Actual) a écrit :
>
> Hi all.
>
> I develop a java-based application to download and manage wallpapers from
> the Internet (wallpaperdownloader) (https://bitbucket.org/eloy_garcia_pca/
> wallpaperdownloader/overview). The applications is in the store but now
> I'm trying to integrate XFCE desktop too. I mean, now you can set any
> wallpaper downloaded directly from the GUI and it is working fine for GNOME
> 3, Unity and MATE. All three of them use gsettings interface and
> desktop-gtk3 wrapper part as you can see in the snapcraft.yaml:
>
> name: wallpaperdownloaderversion: "2.2"summary: Download and manage your favorite wallpapers from the Internetdescription: WallpaperDownloader is a simple GUI Java based application for downloading and managing wallpapers from the Internetgrade: stableconfinement: strictapps:  wallpaperdownloader:    command: wallpaperdownloader.sh    plugs: [x11, network-bind, home, gsettings]parts:  # Pulls the code from the original source (master branch)  # desktop/gtk3 is a snapcraft part (snapcraft-desktop-helpers) from the Wiki: https://wiki.ubuntu.com/snapcraft/parts  # It enables desktop integration and gsettings manipulation from the confined application  # It is necessary to use gsettings interface (see above) in order to have a fully functional  # desktop/gtk3 part  # Github repository for snapcraft-desktop-helpers: https://github.com/ubuntu/snapcraft-desktop-helpers  wallpaperdownloader:    plugin: maven    source: ..    stage-packages:      # mate-desktop-common is necessary to have MATE gsettings schemas available for the application      - mate-desktop-common    after: [desktop/gtk3]  # It will copy wallpaperdownloader script into /bin/  # This script contains all the commands needed (sets env variables, launches the jar file...) to  # execute the application  exec:    plugin: dump    source: scripts
>
> Now, if XFCE desktop is detected by the application, the command run inthe
> background is 'xfconf-query --channel xfce4-desktop --property
> /backdrop/screen0/monitor0/workspace0/last-image --set wallpaper.jpg'. If
> the application runs natively, there is no problem and the wallpaper is set
> properly. But when I test the snap package built, this is the error thrown:
>
> ERROR LinuxWallpaperChanger:188 - Property "/backdrop/screen0/monitor0/workspace0/last-image"
> does not exist on channel "xfce4-desktop". If a new property should be
> created, use the --create option.
>
> I have included xfconf as stage-package and the command xfconf-query is
> found within the snap. Could you give me a hint to solve this problem?
>
> Thank you very much for your time and your help :)
>
>
> Hey Eloy,
>
> I'm not a xfconf user and so can't answer to you precisly. However, my
> guess is that you will need a file (like the dconf one we are using in
> GNOME/Unity environment) shared between your user's settings and the snap
> writable path.
> The desktop launcher is creating a symlink (accessed via the home
> interface) between the main user's dconf/user file to path of the snap
> writable path, to be able to read the value. The gsettings interfaces give,
> on its side, access to the dbus call for this.
>
> I wonder if the unaccessible file/dbus property could trigger this error
> fallback in xfconf, and hence, prints that message.
>
> I hope this helps!
> Cheers,
> Didier
>
>
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>


-- 
Eloy García Almadén
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