snap integration with XFCE
Eloy García (PC Actual)
eloy.garcia.pca at gmail.com
Tue Nov 1 20:18:28 UTC 2016
Hi Didier, hi all.
I've been trying to accomplish this mission but I miss something (my bet is
that I need an interface similar to gsettings but it doesn't exist
something like this).
1.- I have successfully created a symlink from
/home/$USER/.config/xfce4/xfconf/xfce-perchannel-xml inside the snap
directory and all the XML files in which the configuration is stored are
accessible for the application.
2.- I have defined, as stage package, xfconf, the tool to write
configurations directly into those XML files.
3.- But when I execute ' xfconf-query --channel xfce4-desktop --property
/backdrop/screen0/monitor0/workspace0/last-image --set wallpaper.jpg'
inside my application, I still receive 'Property
"/backdrop/screen0/monitor0/workspace0/last-image" does not exist on
channel "xfce4-desktop". If a new property should be created, use the
--create option.' and xfce-destop.xml (the XML which has the configuration
for the background wallpaper) is not modified at all.
Maybe is needed an interface similar to gsettings? If this is the case, can
I program something like that?
Thank you very much! :)
2016-10-24 11:08 GMT+02:00 Didier Roche <didrocks at ubuntu.com>:
> Le 24/10/2016 à 10:58, Eloy García (PC Actual) a écrit :
> > Hi Didier!
> > Thanks as always for your answer and feedback :) I suspected it and I
> > was taking a look to desktop launcher source code on github, but I
> > didn't have time to test it. One question: Can I create the symblink
> > when the snap application is executed (after installation) via the
> > script that i use to wrap up the launching process or will I have
> > problems to do that because of the confinement?
> No worry :)
> As long as your snap has the right plug to access the initial file, this
> isn't an issue (and exactly what I'm doing in the desktop launcher for
> dconf/gsettings: creating symlink on first launch or after each snap
> upgrade if the symlink isn't present).
> You can see such an example in
> for instance.
> (But yeah, it relies on /home/$USER/ and should probably find a better
> way to get user's real home directory. I can't use $HOME as it's
> redirected to SNAP_USER_DATA in some cases)
> > Best,
> > Eloy
> > 2016-10-24 10:14 GMT+02:00 Didier Roche <didrocks at ubuntu.com
> > <mailto: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: wallpaperdownloader
> >> version: "2.2"
> >> summary: Download and manage your favorite wallpapers from the
> >> description: WallpaperDownloader is a simple GUI Java based
> application for
> >> downloading and managing wallpapers from the Internet
> >> grade: stable
> >> confinement: strict
> >> apps:
> >> 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
> >> <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
> >> <https://github.com/ubuntu/snapcraft-desktop-helpers>
> >> wallpaperdownloader:
> >> plugin: maven
> >> source: ..
> >> stage-packages:
> >> # mate-desktop-common is necessary to have MATE gsettings
> >> 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
Eloy García Almadén
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