Qutebrowser QT platform plugin could not be initialized

Related to https://issues.guix.gnu.org/67289#7

Here is the qutebrowser 3 process shell output. Would anyone recommend a solution?

```

$ qutebrowser

20:40:33 WARNING: Could not find the Qt platform plugin "wayland" in ""

20:40:33 CRITICAL: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: offscreen, vnc, minimal, xcb, vkkhrdisplay, linuxfb, minimalegl, eglfs.

Fatal Python error: Aborted

Current thread 0x00007f36c07e6740 (most recent call first):

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/app.py", line 545 in __init__

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/app.py", line 80 in run

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/qutebrowser.py", line 231 in main

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/bin/.qutebrowser-real", line 33 in <module>

Extension modules: PyQt6.QtCore, PyQt6.QtGui, PyQt6.QtWidgets, markupsafe._speedups, yaml._yaml, PyQt6.QtNetwork, PyQt6.QtQml, PyQt6.QtOpenGL, PyQt6.QtDBus, PyQt6.QtPrintSupport, PyQt6.QtWebChannel, PyQt6.QtWebEngineCore, PyQt6.QtWebEngineWidgets, PyQt6.QtSql (total: 14)

```

Hi chris,

chris <chris@bumblehead.com> writes:

Have you installed qt-wayland? Are you setting QT_QPA_PLATFORM

anywhere?

Best,

--

Josselin Poiret

On 1?15? ?, Josselin Poiret wrote:

Hey Josselin,

I've tried installing qtwayland through guix home by specifying "qtwayland" in my home config file. QT_QPA_PLATFORM is specified in my home config this way

```

(simple-service 'env-vars home-environment-variables-service-type

'(("EDITOR" . "emacs")

("OPENER" . "sh.opener.sh")

("BROWSER" . "qutebrowser")

("GTK_IM_MODULE" . "fcitx")

("QT_IM_MODULE" . "fcitx")

("XMODIFIERS" . "@im=fcitx")

("QT_QPA_PLATFORM" . "wayland")

("QT_SCALE_FACTOR" . "1")

("XDG_SESSION_TYPE" . "wayland")

("XDG_SESSION_DESKTOP" . "sway")

("XDG_CURRENT_DESKTOP" . "sway")

("DESKTOP_SESSION" . "sway")

("LIBSEAT_BACKEND" . "seatd")))

```

QT_QPA_PLATFORM prints at the shell this way

```

$ echo $QT_QPA_PLATFORM

wayland

```

I tried changing "qtwayland" to "qtwayland@6.5" in my home config and reconfiguring home. I've also tried installing qtwayland without guix home using "guix install qtwayland" but those did not resolve the issue.

I can try any suggestion and if it doesn't work, revert back using guix home switch-generation

chris <chris@bumblehead.com> writes:

Here you go:

```sh

qtw=$(guix build qtwayland@6)/lib/qt6/plugins

QT_PLUGIN_PATH=$qtw QT_QPA_PLATFORM_PLUGIN_PATH=$qtw/platforms qutebrowser -s qt.force_platform wayland

```

Maybe a qutebrowser-wayland package variant should be defined to do the

required wrapping. Otherwise you can just install qtwayland@6 to your

profile and use ~/.guix-home/profile/lib/qt6/plugins in paths.

On 1?16? ?, Sergey Trofimov wrote:

Neither approach succeeded for me. What am I doing wrong...

```sh

$ ls $qtw

platforms/ wayland-graphics-integration-client/ wayland-shell-integration/

wayland-decoration-client/ wayland-graphics-integration-server/

$ ls $qtw/platforms

libqwayland-egl.so libqwayland-generic.so

$ qtw=/home/bumble/.guix-home/profile/lib/qt6/plugins; QT_PLUGIN_PATH=$qtw; QT_QPA_PLATFORM_PLUGIN_PATH=$qtw/platforms; qutebrowser -s qt.force_platform wayland

23:00:47 WARNING: Could not find the Qt platform plugin "wayland" in ""

23:00:47 CRITICAL: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: offscreen, vnc, minimal, xcb, vkkhrdisplay, linuxfb, minimalegl, eglfs.

Fatal Python error: Aborted

Current thread 0x00007f7b99434740 (most recent call first):

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/app.py", line 545 in __init__

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/app.py", line 80 in run

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/qutebrowser.py", line 231 in main

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/bin/.qutebrowser-real", line 33 in <module>

Extension modules: PyQt6.QtCore, PyQt6.QtGui, PyQt6.QtWidgets, markupsafe._speedups, yaml._yaml, PyQt6.QtNetwork, PyQt6.QtQml, PyQt6.QtOpenGL, PyQt6.QtDBus, PyQt6.QtPrintSupport, PyQt6.QtWebChannel, PyQt6.QtWebEngineCore, PyQt6.QtWebEngineWidgets, PyQt6.QtSql (total: 14)

```

On 1?15? ?, chris wrote:

I tried this command again just now and succeeded this time. I must have done something wrong the first time.

Thank you Sergey!

On 1?15? ?, chris wrote:

I think it needed the extra slash after at the end of $qtw... the shell output looks problematic, but otherwise the browser has started. Thank you

```

$ qtw=$(guix build qtwayland@6)/lib/qt6/plugins; QT_PLUGIN_PATH=$qtw/; QT_QPA_PLATFORM_PLUGIN_PATH=$qtw/platforms; qutebrowser -s qt.force_platform wayland

23:47:07 ERROR: Failed to copy webengine resources, not applying quirk

Traceback (most recent call last):

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/misc/pakjoy.py", line 253, in patch_webengine

webengine_resources_path = copy_webengine_resources()

File "/gnu/store/xc2z9q7z036ny3fipgqvwc01yn20j2jh-qutebrowser-3.1.0/lib/python3.10/site-packages/qutebrowser/misc/pakjoy.py", line 197, in copy_webengine_resources

shutil.rmtree(work_dir)

File "/gnu/store/3lxr2xg3yscdb3979blgjg0h7xd1n9la-python-3.10.7/lib/python3.10/shutil.py", line 724, in rmtree

_rmtree_safe_fd(fd, path, onerror)

File "/gnu/store/3lxr2xg3yscdb3979blgjg0h7xd1n9la-python-3.10.7/lib/python3.10/shutil.py", line 680, in _rmtree_safe_fd

onerror(os.unlink, fullname, sys.exc_info())

File "/gnu/store/3lxr2xg3yscdb3979blgjg0h7xd1n9la-python-3.10.7/lib/python3.10/shutil.py", line 678, in _rmtree_safe_fd

os.unlink(entry.name, dir_fd=topfd)

PermissionError: [Errno 13] ????????: 'qtwebengine_devtools_resources.pak'

23:47:08 INFO: Showing changelog after upgrade to qutebrowser v3.1.0.

```

Qutebrowser 3 does not have sound and this appears in the process output. "??????????????????????" means "the file or directory is not found".

```

[3158:3158:0116/000131.568005:ERROR:interface_endpoint_client.cc(694)] Message 4 rejected by interface blink.mojom.WidgetHost

ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave

[3473:3473:0116/000734.652713:ERROR:alsa_util.cc(204)] PcmOpen: default,??????????????????????

ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave

[3473:3473:0116/000734.653460:ERROR:alsa_util.cc(204)] PcmOpen: plug:default,??????????????????????

ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave

[3473:3473:0116/000824.855365:ERROR:alsa_util.cc(204)] PcmOpen: default,??????????????????????

ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave

[3473:3473:0116/000824.856521:ERROR:alsa_util.cc(204)] PcmOpen: plug:default,??????????????????????

ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave

[3473:3473:0116/000826.415347:ERROR:alsa_util.cc(204)] PcmOpen: default,??????????????????????

ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave

[3473:3473:0116/000826.416368:ERROR:alsa_util.cc(204)] PcmOpen: plug:default,??????????????????????

```

chris <chris@bumblehead.com> writes:

Sound works for me both in X11 and Wayland environments. I use

pipewire though.

On Mon, Jan 15 2024, chris wrote:

Hi,

Would this work with non-wayland users too? (So that it would make

sense to add it to the main package?)

Thanks,

Clément

Clément Lassieur <clement@lassieur.org> writes:

Yeah, it would work, but forcing the platform through parameters

is not necessary. I added it just to be sure that wayland is being

used instead of xcb. On the other hand I think adding qtwayland

dependency to every qt-based gui program doesn't make sense. Maybe

a qtwayland-home-service makes more sense which would install the

dependency and set required environment variables. This way it

would work for every Qt GUI program on wayland.

On Tue, Jan 16 2024, Sergey Trofimov wrote:

Ok, I see, thanks!

Clément Lassieur <clement@lassieur.org> writes:

As simple as:

On 1?16? ?, Sergey Trofimov wrote:

This works here. After adding the above to my home config, qutebrowser starts as `qutebrowser` without the extra params.

As for the sound issue, this system uses pipewire only, without dbus. mpv, musikcube and the previous version of qutebrowser have/had sound. When I first setup guix about a year ago, qutebrowser 2 did not produce sound and, to resolve the issue, Iyzsong, in the matrix or irc channel, said they would enable native support for pipewire through a flag at qutebrowser (or maybe one of the dependencies... I don't remember) and the next day after pull and reconfigure the sound began working and there were no sound problems until updating to qutebrowser 3 today.

The snippet should be attributed to Sergey, my apology for incorrectly editing the reply

I'm not sure what the correct protocol or etiquette is but I think this issue could be closed by sending an email to 68483-done@debbugs.gnu.org

Maybe the 'done' email should be sent from Sergey who provided the solution?

I would like to close this issue and open new separate issues for sound and the PermissionError shown in the process output around 'qtwebengine_devtools_resources.pak'

closing

Hey everyone the close email is sent and two separate issues opened, linked below,

* https://issues.guix.gnu.org/68512Qutebrowser 3, no sound from pipewire-only system,

* https://issues.guix.gnu.org/68513Qutebrowser 3, PermissionError qtwebengine_devtools_resources.pak