Mir: Could not find cursor for shape

om26er · September 22, 2018, 12:40am

My snap works fine on X11 and Mir (and UbuntuCore). Though while running on UbuntuCore system the logs continuously print “Could not find cursor for shape” as I move the mouse inside my PySide 2 app. Below is a complete log, those warnings go away if I use desktop-glib-only remote part.

om26er@localhost:~$ sudo xbr-dashboard 
+ grep -q snap_core= /proc/cmdline
+ export QT_QPA_PLATFORM=wayland-egl
+ export XDG_RUNTIME_DIR=/run/user/0/
+ python3 -u /snap/xbr-dashboard/x1/main.py --no-sandbox
Could not load theme "default"
Using Wayland-EGL
libEGL warning: MESA-LOADER: failed to retrieve device information

MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to retrieve device information
WebEngine compiled with X11 support, however qpa backend is not xcb. This may fail.
Could not find cursor for shape 0
Could not find cursor for shape 0
Using the 'xdg-shell-v6' shell integration
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
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Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
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Could not find cursor for shape 0
Could not find cursor for shape 4
Could not find cursor for shape 4
Could not find cursor for shape 0
Could not find cursor for shape 0
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Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 12
Could not find cursor for shape 12
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 12
Could not find cursor for shape 12
Could not find cursor for shape 0
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Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
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Could not find cursor for shape 0
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Could not find cursor for shape 0
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Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 0
Could not find cursor for shape 12

lucyllewy · September 22, 2018, 9:13am

Surely you’ve answered your own question then, no? If using desktop-glib-only fixes the problem then using desktop-glib-only is the solution.

om26er · September 22, 2018, 9:26am

No, I am changing my app to move away from desktop-glib-only as that’s an overkill for my use case and as I was told by @ogra most of those environment variables set by desktop-glib-only part are redundant in our application that is mainly going to run on UbuntuCore

ogra · September 22, 2018, 10:16am

well, i didnt tell you to drop the world, i only said that you likely wont have the themes, fonts and desktop bits the desktop-glib-only launcher will point to. this log spam looks like you are simply missing one variable and perhaps a related stage package, i’d try to find out which one and just add my own launcher to set the necessary defaults.

i also told you on IRC we should perhaps consider having a derivative launcher for kiosk environments where only bits are pointed to that are actually found on kiosk environments … i.e. kiosk-glib-only as a cut down version of desktop-glib-only that is less bloated (often kiosk systems are on the lower end and resources are limited, there is no need to ship a ton of fonts and icon themes you will not use)

om26er · September 22, 2018, 11:09am

btw, here is how my snapcraft.yaml looks like, also those warnings don’t appear while running under Xorg. I do agree there is probably an environment variable missing, I spent quite a few hours trying to debug that last night but no success, will take another stab tonight. I do acknowledge that many of those stage packages are probably not needed.

name: xbr-dashboard
version: '0.2'
summary: XBR Applets Dashboard
description: |
  XBR Applets Dashboard
grade: stable
confinement: strict

apps:
  xbr-dashboard:
    command: start.sh
    environment:
      PYTHONPATH: $SNAP/pyside
      LIBGL_DRIVERS_PATH: $SNAP/usr/lib/x86_64-linux-gnu/dri:/var/lib/snapd/lib/gl/xorg
      XCOMPOSEFILE: $SNAP/usr/share/X11/locale/en_US.UTF-8/Compose
    slots:
      - x11
    plugs:
      - network
      - opengl
      - desktop
      - wayland
      - browser-support
      - x11-plug

parts:
  dashboard:
    plugin: dump
    source: .
    stage:
      - main.py
      - start.sh
      - components/*

  pyside:
    plugin: nil
    override-build: |
      snapcraftctl build
      python3 -m easy_install pip
      mkdir -p ${SNAPCRAFT_PART_INSTALL}/pyside
      pip install --no-cache-dir --index-url=http://download.qt.io/snapshots/ci/pyside/5.11/latest/ pyside2 --trusted-host download.qt.io -t ${SNAPCRAFT_PART_INSTALL}/pyside
      rm -r ${SNAPCRAFT_PART_INSTALL}/pyside/PySide2/examples
    build-packages:
      - python3-setuptools
    stage-packages:
      - libnss3
      - libxcomposite1
      - libxcursor1
      - libxtst6
      - libxrandr2
      - libasound2
      - libglu1-mesa
      - libgles2-mesa
      - fontconfig
      - libxkbcommon0
      - ttf-ubuntu-font-family
      - dmz-cursor-theme
      - light-themes
      - adwaita-icon-theme
      - gnome-themes-standard
      - shared-mime-info
      - libgdk-pixbuf2.0-0
      - locales-all
      - libxslt1.1
      - fonts-dejavu-core
      - xfonts-base
      - xfonts-scalable
    after:
      - dashboard

plugs:
  x11-plug:
    interface: x11

passthrough:
  layout:
    /usr/share/fonts:
      bind: $SNAP/usr/share/fonts
    /etc/fonts:
      bind: $SNAP/etc/fonts