Snap with gtk/gtkmm/pango/cairo and error on run

RomanS · July 29, 2020, 12:23pm

Hi all,

I am trying to build mysnap with extensions: [gnome-3-34] and everything is fine - I have mysnap for x64 arch. But when I run it, I got the error with the next log:

snap run mysnap
Warning: Schema “org.gnome.system.locale” has path “/system/locale/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy” has path “/system/proxy/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.http” has path “/system/proxy/http/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.https” has path “/system/proxy/https/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.ftp” has path “/system/proxy/ftp/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
Warning: Schema “org.gnome.system.proxy.socks” has path “/system/proxy/socks/”. Paths starting with “/apps/”, “/desktop/” or “/system/” are deprecated.
/snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3-0/gtk-query-immodules-3.0: symbol lookup error: /snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3.so.0: undefined symbol: pango_font_description_set_variations
ERROR: /snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3-0/gtk-query-immodules-3.0 exited abnormally with status 127
/snap/mysnap/x1/usr/bin/mysnap: symbol lookup error: /snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3.so.0: undefined symbol: pango_font_description_set_variations

I use gtk/gtkmm/pango/cairo in mysnap app, how can I fix it? Thanks!

galgalesh · July 29, 2020, 12:35pm

Can you post your snapcraft.yaml file? This might help finding the issue.

RomanS · July 29, 2020, 2:20pm

Yes, sure:

name: mysnap
title: mysnap app
version: "1.0"
type: app
description: |
    some description

#confinement: classic
confinement: devmode
base: core18
icon: mysnap/icons/48x48/mysnap.png
license: Proprietary
#grade: stable
grade: devel

architectures:
  - build-on: x64_64
    run-on: x64_64

parts:
  nativelib:
    plugin: make
    source: ./nativelib
    build-environment:
    - NATIVELIB_ROOT: "$SNAPCRAFT_PART_BUILD"
    override-build: |
      ./src/snap.sh
    build-packages:
      - g++
      - gcc
      - make
      - pkg-config
      - libglib2.0-dev
      - libgstreamer1.0-dev
      - libgstreamer-plugins-base1.0-dev
      - libgstreamer-plugins-good1.0-dev
      - libgstreamer-plugins-bad1.0-dev
      - gstreamer1.0-vaapi
      - libssl1.0-dev
      - libxml2-dev
      - libpcre3-dev
      - zlib1g-dev
    stage-packages:
      - libglib2.0-dev
      - gstreamer1.0-x
      - libgstreamer1.0-0
      - gstreamer1.0-plugins-base
      - gstreamer1.0-plugins-good
      - gstreamer1.0-plugins-bad
      - gstreamer1.0-vaapi
      - libgpm2
      - libslang2
      - openssl
      - libxml2
      - libpcre3
      - zlib1g
  mysnap:
    after:
    - nativelib
    plugin: make
    source-type: local
    source: ./mysnap
    build-environment:
    - MYSNAP_ROOT: "$SNAPCRAFT_PART_BUILD"
    - OPENSSL_ROOT_CONFIG: "$SNAPCRAFT_PART_INSTALL/usr/include/x86_64-linux-gnu"
    - INSTALL_DIR: "$SNAPCRAFT_PRIME"
    override-build: |
      ./gtkmm/snap.sh
    build-packages:
      - g++
      - gcc
      - make
      - pkg-config
      - libglib2.0-dev
      - libgstreamer1.0-dev
      - libgstreamer-plugins-base1.0-dev
      - libgstreamer-plugins-good1.0-dev
      - libgstreamer-plugins-bad1.0-dev
      - gstreamer1.0-vaapi
      - libsigc++-2.0-dev
      - libssl1.0-dev
      - libxml2-dev
      - libgl1
      - libglvnd0
      - libglx0
      - libgpm2
      - libslang2
      - libpcre3-dev
      - zlib1g-dev
      - file
    stage-packages:
      - libglib2.0-dev
      - gstreamer1.0-x
      - libgstreamer1.0-0
      - gstreamer1.0-plugins-base
      - gstreamer1.0-plugins-good
      - gstreamer1.0-plugins-bad
      - gstreamer1.0-vaapi
      - libsigc++-2.0-0v5
      - openssl
      - libxml2
      - libgpm2
      - libslang2
      - libpcre3
      - freeglut3
      - libglu1
      - zlib1g

apps:
  mysnap:
    command: usr/bin/snaprun.sh
    extensions: [gnome-3-34]

galgalesh · July 29, 2020, 2:53pm

Can you edit your comment to put the code in a code block like this? That makes it a lot easier to parse your file.

```yaml
name: mysnap
title: mysnap app
version: “1.0”
type: app
description: |
some description
...
```

Thanks!

galgalesh · July 29, 2020, 3:04pm

This error makes me think that there is a mismatch between the version of GTK 3 your application was built for and the version of GTK 3 that is used in the snap. Could you maybe try the gnome-3-34 extension instead? That extension does a bit more setup of the build environment to make sure the correct version of GTK 3 is used.

It might also be best to remove libglib2.0-dev from build and stage packages since that is provided by the extension and the versions might conflict.

RomanS · July 29, 2020, 4:02pm

Yes, I already removed this dep from snapcraft

This error makes me think that there is a mismatch between the version of GTK 3 your application was built for and the version of GTK 3 that is used in the snap. Could you maybe try the gnome-3-34 extension instead? That extension does a bit more setup of the build environment to make sure the correct version of GTK 3 is used.

Hmmm, I use gnome-3-34 extension…

Maybe I should manually add glib/gtk/pango and other libs to stage/build packages instead of use gnome-3-34 extension?

galgalesh · July 29, 2020, 4:13pm

That will probably give you a lot more issues than it will fix. The extension does a lot for you.

As a sanity check, have you tried a clean build and a clean install? It might be that the build environment is tainted if you experimented a lot while building your snap. Have you tried running snapcraft clean and re-run snapcraft? And run snap remove mysnap --purge before installing the resulting snap.

Maybe @hellsworth has any idea what might be going on here?

RomanS · July 29, 2020, 4:55pm

Yes, of course I tried this.
BTW I tried to search symbol pango_font_description_set_variations inside all built snap files, but it could not be found.

galgalesh · July 29, 2020, 6:29pm

Yes, it seems to be gtk-query-immodules-3.0 of the gnome-3-34-1804 platform snap which tries to lookup the symbol.

One thing you could try is use the cleanup part to make all duplicated (and thus possibly incompatible) libraries are removed from your snap.
Another thing you could try is using the gnome-3-28 extension instead. The GTK version in that extension is much closer to the one of Ubuntu 18.04, so you have less chance of getting incompatibilities.
Lastly, it might help us if you could provide us with the snap. I see the application itself is proprietary; is the snap publicly available?

galgalesh · July 29, 2020, 6:45pm

If you want a more clear picture of what is going wrong, it might be interesting to open a shell in the environment of the snap snap run --shell mysnap and look at what libraries /snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3-0/gtk-query-immodules-3.0 and /snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3.so.0 are linking to using ldd: ldd /snap/mysnap/x1/gnome-platform/usr/lib/x86_64-linux-gnu/libgtk-3.so.0.

All the libraries it links to should come from /snap/mysnap/x1/gnome-platform (this is where gnome-3-34-1804 is mounted in your snap). If that’s not the case, that might be the issue.

RomanS · July 30, 2020, 6:51am

Thank you very much for your time and help. gnome-3-28 extension with gtkmm libs helped me. Now the snap with app works. I really appreciate your help to me

hellsworth · August 3, 2020, 10:33pm

Hmm I’m glad that using the gnome-3-28 extension solved the issue for you, but it would be good to know what’s going on here with the gnome-3-34 extension though. @RomanS would it be possible to share the snap with me so I could debug it?

RomanS · August 4, 2020, 9:31am

This is proprietary snap, I cannot to share it. I think the problem inside the next code:

		netstr_snprintf(fontstr, sizeof(fontstr), "Helvetica Normal Bold %d", calch);

		desc = Pango::FontDescription(string(fontstr));
		desc.set_weight(Pango::Weight::WEIGHT_BOLD);
		desc.set_style(Pango::Style::STYLE_NORMAL);
		desc.set_variant(Pango::VARIANT_NORMAL);
		desc.set_stretch(Pango::STRETCH_NORMAL);

		layout = Pango::Layout::create(cr);
		layout->set_text(initials);
		layout->set_alignment(Pango::ALIGN_LEFT);
		layout->set_width(-1);
		layout->set_font_description(desc);
		layout->set_auto_dir(true);
		layout->get_pixel_size(layoutw, layouth);

As I already mentioned, I use gtkmm, my pkg-config:

CFLAGS=$(shell pkg-config --cflags pangocairo pango cairo gtk+-3.0 gtkmm-3.0 gdk-3.0 webkit2gtk-4.0 gstreamer-1.0 gstreamer-app-1.0 gstreamer-video-1.0 gstreamer-gl-1.0 libnotify libxml-2.0 x11) LFLAGS=$(shell pkg-config --libs pangocairo pango cairo gtk+-3.0 gtkmm-3.0 gdk-3.0 webkit2gtk-4.0 gstreamer-1.0 gstreamer-app-1.0 gstreamer-video-1.0 gstreamer-gl-1.0 libnotify libxml-2.0 x11)

You can write simple c++ app and repeat the problem. And you already have my snapcraft.yaml