[Bug 1970057] Re: Qt6 QLibraryInfo returns wrong paths

[Dan Bryant]

For now the only solution I've found is to uninstall Ubuntu's Qt6 and
instead use aqtinstall to install Qt6. This is not a good solution for
everyone.

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Title:
  Qt6 QLibraryInfo returns wrong paths

Status in Stellarium:
  New
Status in qt6-base package in Ubuntu:
  Fix Released
Status in qt6-base source package in Jammy:
  Confirmed

Bug description:
  The qtdiag program can be used to find the paths returned by
  QLibraryInfo:

  qtdiag --no-vulkan --no-rhi --no-gl

  In this output on jammy (22.04) with qt6-base-dev (6.2.4+dfsg-2ubuntu1) I see:
  Library info:
    PrefixPath: /
    DocumentationPath: /share/qt6/doc
    HeadersPath: /include/x86_64-linux-gnu/qt6
    LibrariesPath: /lib/x86_64-linux-gnu
    LibraryExecutablesPath: /lib/qt6/libexec
    BinariesPath: /lib/qt6/bin
    PluginsPath: /lib/x86_64-linux-gnu/qt6/plugins
    QmlImportsPath: /lib/x86_64-linux-gnu/qt6/qml
    ArchDataPath: /lib/x86_64-linux-gnu/qt6
    DataPath: /share/qt6
    TranslationsPath: /share/qt6/translations
    ExamplesPath: /lib/x86_64-linux-gnu/qt6/examples
    TestsPath: /tests
    SettingsPath: /etc/xdg

  This is problematic.  For example, the DataPath /share/qt6 does not
  exist.  This can lead to various failures.  For example a Qt
  application using the Qt WebEngine might report:

  Qt WebEngine resources not found at /share/qt6/resources. Trying parent directory...
  Qt WebEngine resources not found at /share/qt6. Trying application directory...
  Qt WebEngine resources not found at /app/gpsbabel/gui/GPSBabelFE. Trying fallback directory... The application MAY NOT work.
  Path override failed for key base::DIR_QT_LIBRARY_DATA and path '/home/tsteven4/.GPSBabel'
  Installed Qt WebEngine locales directory not found at location /share/qt6/translations/qtwebengine_locales. Trying application directory...
  Qt WebEngine locales directory not found at location /app/gpsbabel/gui/GPSBabelFE/qtwebengine_locales. Trying fallback directory... Translations MAY NOT not be correct.
  Path override failed for key ui::DIR_LOCALES and path '/home/tsteven4/.GPSBabel'
  [0423/194717.040426:ERROR:resource_bundle.cc(911)] Failed to load /home/tsteven4/.GPSBabel/qtwebengine_resources_100p.pak
  Some features may not be available.
  [0423/194717.041440:ERROR:resource_bundle.cc(911)] Failed to load /home/tsteven4/.GPSBabel/qtwebengine_resources_200p.pak
  Some features may not be available.
  [0423/194717.041481:ERROR:resource_bundle.cc(911)] Failed to load /home/tsteven4/.GPSBabel/qtwebengine_resources.pak
  Some features may not be available.
  [0423/194717.042243:WARNING:resource_bundle_qt.cpp(119)] locale_file_path.empty() for locale 
  [3004:3004:0423/194717.389096:ERROR:extension_system_qt.cpp(121)] Failed to parse extension manifest.
  Segmentation fault (core dumped)

  I note that qtdiag reports the correct paths on debian sid and
  qt6-base-dev (6.2.4+dfsg-4):

  Library info:
    PrefixPath: /usr
    DocumentationPath: /usr/share/qt6/doc
    HeadersPath: /usr/include/x86_64-linux-gnu/qt6
    LibrariesPath: /usr/lib/x86_64-linux-gnu
    LibraryExecutablesPath: /usr/lib/qt6/libexec
    BinariesPath: /usr/lib/qt6/bin
    PluginsPath: /usr/lib/x86_64-linux-gnu/qt6/plugins
    QmlImportsPath: /usr/lib/x86_64-linux-gnu/qt6/qml
    ArchDataPath: /usr/lib/x86_64-linux-gnu/qt6
    DataPath: /usr/share/qt6
    TranslationsPath: /usr/share/qt6/translations
    ExamplesPath: /usr/lib/x86_64-linux-gnu/qt6/examples
    TestsPath: /usr/tests
    SettingsPath: /etc/xdg

  It is not clear to me if this is because of the difference in package
  versions, or some issue with ubuntu packaging.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: libqt6core6 6.2.4+dfsg-2ubuntu1
  ProcVersionSignature: Ubuntu 5.13.0-40.45~20.04.1-generic 5.13.19
  Uname: Linux 5.13.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Sat Apr 23 19:40:12 2022
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  SourcePackage: qt6-base
  UpgradeStatus: No upgrade log present (probably fresh install)

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