Cannot open images after recent commits

[qarmin]

After upgrading version of GTK plugin(from c008df6 to 447f23f), I lost ability to open images.

Steps to reproduce:

• Download Appimages
• Extract archive(contains few images) - FF.zip
• Open Appimage
• Add at the top directory with previously extracted folder
• Go to similar images tab
• Search for similar images
• Try to open by double click image

In 2.1.0 version, image should open in ImageMagick app, but 2.2.0 version doesn't show anything(maybe is a way to open it in default image app?).
I doesn't change logic between versions, but 2.2 version should prints when xdg-open fails to open app

https://github.com/qarmin/czkawka/releases/download/2.2.0/linux_czkawka_gui.AppImage
https://github.com/qarmin/czkawka/releases/download/2.1.0/linux_czkawka_gui.AppImage

[TheTumultuousUnicornOfDarkness]

It works for me, both with 2.1.0 and 2.2.0.
Do you think something is missing in XDG_DATA_DIRS export?

You can extract your AppImage with ./linux_czkawka_gui.AppImage --appimage-extract, then edit squashfs-root/apprun-hooks/linuxdeploy-plugin-gtk.sh file and add $HOME/.local/share to XDG_DATA_DIRS.
To test, run ./squashfs-root/AppRun.

[qarmin]

I don't see any difference.

I'm using Ubuntu 20.04. I tried to reproduce it on different OS, but for now after updating kernel I don't have access to VirtualBox.

Opening folders in default file manager works fine(this is done by double click with Right mouse button)

[TheTumultuousUnicornOfDarkness]

Ok, I'm able to reproduce your issue on a Ubuntu VM.
When I comment GDK_PIXBUF_MODULE_FILE, it works.
All I know for the moment is it concerns EOG only: with other default image viewer, I don't have this issue.

I need to investigate deeper...

[TheAssassin]

Just for the record, I just discovered some Gtk+ related stuff in https://docs.appimage.org/packaging-guide/manual.html#bundling-gtk-libraries. Doubt it helps. Perhaps it should be updated or removed.

[qarmin]

I also found, that natively installed app allows to open multiple images at once(by double click of left mouse button) but packed with appimage allows to open only one image and entire app freeze until I close ImageMagick app(tested only with 2.1).

In appimage forum I got info that this is not problem with Appimage because problem persists when app is unpacked with --appimage-extract

[TheTumultuousUnicornOfDarkness]

The the link between GDK_PIXBUF_MODULE_FILE and this bug is the following:

• $APPDIR/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/libpixbufloader-png.so is called
• this library depends on libpng16.so.16
• it crashes somewhere in libpng16.so.16

Full BT: debug.txt

As you can see in BT, libpng16.so.16 is loaded from /lib/x86_64-linux-gnu, while is it available in $APPDIR/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders/../../../../.
The problem is EOG also depends on libpng16.so.16.

Setting LD_LIBRARY_PATH to $APPDIR/usr/lib definitively solves this problem. So it is like the libpng16.so.16 in Focal is not the same as Xenial...

@TheAssassin Any idea to force libpixbufloader-png.so to load the correct libpng16.so.16 library?

[TheAssassin]

Can you provide a link to the broken AppImage so I can check it out?

[TheTumultuousUnicornOfDarkness]

Links are in first post.

[TheTumultuousUnicornOfDarkness]

Maybe GDB does not respect RPATH, so forget the BT.

@qarmin Can you test if the issue is related to a problem with shared libraries? Try to replace the following line in squashfs-root/apprun-hooks/linuxdeploy-plugin-gtk.sh:

export LD_LIBRARY_PATH="$GDK_PIXBUF_MODULEDIR:$LD_LIBRARY_PATH"

By this one:

export LD_LIBRARY_PATH="$APPDIR/usr/lib:$GDK_PIXBUF_MODULEDIR:$LD_LIBRARY_PATH"

[qarmin]

After change I'm able to open image in ImageMagick(setting any other default app like eye of gnome, still opens ImageMagick)

[TheTumultuousUnicornOfDarkness]

Changing default application has been complicated for me too.
But I succeed to open an image from your AppImage without any changes, see my screenshot:

No issue with ImageMagick, but with EOG I am still investigating...

@qarmin can you check the default application for JPEG files, please?

xdg-mime query default image/jpeg

[qarmin]

org.gnome.eog.desktop

[TheTumultuousUnicornOfDarkness]

Then try to change it to ImageMagick:

xdg-mime default display-im6.q16.desktop image/jpeg

[qarmin]

Now jpg opens in image magick and png still shows nothing

[TheTumultuousUnicornOfDarkness]

Maybe you need to change default file association for PNG files too.