Error while loading shared libraries Golang app

snapcraft
1

Hi all. I was following a tutorial for adding a Golang app with snapcraft:

The app builds okay with multipass but when trying to execute, I get this error:

error while loading shared libraries: libasound.so.2: cannot open shared object file: No such file or directory

I’m confused because I’ve added this library under the build packages (I’ve tried libasound2-dev as well as just libasound2).

Any advice is appreciated thanks.

---
name: myapp
license: GPL-3.0+
version: git
summary: mysummary
icon: snap/gui/logo.png
description:  my description
confinement: devmode
base: core18
parts:
  myapp:
    plugin: go
    go-importpath: github.com/myname/myapp
    source: .
    source-type: git
    build-packages:
      - gcc
      - make
      - libsdl1.2-dev
      - libasound2
      - libpng-dev
      - libsdl-net1.2-dev
      - libc6-dev
      - libglu1-mesa-dev
      - libgl1-mesa-dev
      - libxcursor-dev
      - libxi-dev
      - libxinerama-dev
      - libxrandr-dev
      - libxxf86vm-dev
      - pkg-config
apps:
  myapp:
    command: bin/myapp
...
2

In order to use it at runtime after the snap is built, you should put the package under stage-packages, not build-packages. build-packages is really for libraries/tools/etc that are needed only at build time to build the application, but stage-packages is for libraries/tools/etc that your application uses at runtime.

3

Thank you for replying so fast. I’ll give that a shot.

4

well that error seems to be replaced with a new one:

panic: exec: "gsettings": executable file not found in $PATH

Looks like a Golang library that I am using is maybe missing a dependency but not sure… hmmm

The traceback leads to this:

/root/parts/myapp/go/pkg/mod/github.com/hajimehoshi/ebiten@v1.12.0/internal/uidriver/glfw/ui.go:120 +0x25

Looking at the library’s code: https://github.com/hajimehoshi/ebiten/blob/master/internal/uidriver/glfw/ui.go I have no idea why it’s panicking

5 
$ dpkg -S $(which gsettings)
libglib2.0-bin: /usr/bin/gsettings
$

you want libglib2.0-bin in your stage-packages …

6

Hi ogra. Thanks I’ll give that a shot

7

okay got a new one:

libGL error: MESA-LOADER: failed to open swrast (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri)
libGL error: failed to load driver: swrast

I figured adding mesa-utils and libgl1-mesa-glx would fix but unfortunately not…

This is what my build and stage packages look like now:

    build-packages:
      - gcc
      - make
      - libsdl1.2-dev
      - libpng-dev
      - libsdl-net1.2-dev
      - libc6-dev
      - libglu1-mesa-dev
      - libgl1-mesa-dev
      - libxcursor-dev
      - libxi-dev
      - libxinerama-dev
      - libxrandr-dev
      - libxxf86vm-dev
      - pkg-config
    stage-packages:
      - libasound2-dev
      - libgl1
      - libglvnd0
      - libglx0
      - libx11-6
      - libxau6
      - libxcb1
      - libxdmcp6
      - libglib2.0-bin
      - mesa-utils
      - libgl1-mesa-glx
8

Ah found this… Adding OpenGL/GPU support to a snap might try it

9

ugh no luck still… added the desktop-glib-only sections etc. It’s at leas reaching my application logs now

2020/10/02 13:02:57 VersionUnavailable: GLX: Failed to create context: GLXBadFBConfig

but still getting this error when running the installed Snap:

libGL error: MESA-LOADER: failed to open swrast (search paths /usr/lib/x86_64-linux-gnu/dri:\$${ORIGIN}/dri:/usr/lib/dri)
libGL error: failed to load driver: swrast
11

you want to use either an extension (like gnome-3-34-1804) or a desktop-helper part here so the LibGL paths as well as the LD_LIBRARY_PATH have all the right bits set for OpenGL operation (and can manage the various graphics drivers a host could use) …

12

Well I was going to give up and then saw that post about extensions. It’s close to working now but not 100%.

The app now opens briefly and crashes (I’m guessing because of audio).
After looking at the mentioned extensions link, my yaml now looks like this:


---
name: myapp
license: GPL-3.0+
version: git
summary: my summary
icon: snap/gui/logo.png
description:  some description
confinement: devmode
base: core18
parts:
  myapp:
plugin: go
go-importpath: github.com/myname/myapp
source: .
source-type: git
build-packages:
  - gcc
  - make
  - libsdl1.2-dev
  - libpng-dev
  - libsdl-net1.2-dev
  - libc6-dev
  - libgl1-mesa-dev
  - libxcursor-dev
  - libxi-dev
  - libxinerama-dev
  - libxrandr-dev
  - libxxf86vm-dev
  - pkg-config
stage-packages:
  - libasound2-dev
  - libgl1
  - libglvnd0
  - libglx0
  - libx11-6
  - libxau6
  - libxcb1
  - libxdmcp6
  - libglib2.0-bin
  - mesa-utils
  - libgl1-mesa-glx
  - libgl1-mesa-dri
  - libglu1-mesa
  - libgles2-mesa
  - libflac8
  - libxcursor1
  - libxi6
  - libxinerama1
  - libxrandr2
  - libxrender1
  - libasound2
  - libasyncns0
  - libogg0
  - libpulse0
  - libsndfile1
  - libtheora0
  - libvorbis0a
  - libvorbisenc2
  - libvorbisfile3
  - libwebp6
apps:
  myapp:
    extensions: [gnome-3-28]
    command: bin/myapp
    plugs:
      - audio-playback
      - desktop
      - desktop-legacy
      - home
      - x11
      - unity7
      - browser-support
      - network
      - gsettings
      - pulseaudio
      - alsa
      - opengl
...

I now get this when the app crashes:

ALSA lib conf.c:3916:(snd_config_update_r) Cannot access file /usr/share/alsa/alsa.conf
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM default

And inside of my logs:

2020/10/02 17:31:22 oto: ALSA error: No such file or directory

I found this link Cannot access file /usr/share/alsa/alsa.conf if not using --devmode flag but I’m not sure if it is applicable. I’m running with --devmode and I “think” that I have the appropriate extensions.

13

Okay finally got it working with @lucyllewy 's example here: Reusable alsa-lib part - #24 by lucyllewy :raised_hands:

The layout and alsa parts fixed it.

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