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The bug of opencv is fixed now.

I am having the same issue as @Integral. Confirming that @husixu's fix worked for me. For those wondering, I downgraded vtk to 9.1.0 by running the following:

pacman -U /var/cache/pacman/pkg/vtk-9.1.0-26-x86_64.pkg.tar.zst

@husixu It works. Thank you :)

@Integral Seems like an opencv -> vtk dependency issue. I've downgraded vtk to 9.1.0 and that solves the issue for now.

I CANNOT use howdy now

Error infomation: ImportError: /usr/lib/libopencv_viz.so.407: undefined symbol: _ZN12vtkAlgorithm8RegisterEP13vtkObjectBase

Export this environment variable OPENCV_LOG_LEVEL=OFF to disable all OpenCV warnings.

@postblue Same warnings here. But as it works, I didn't look any further :-)

As part of a possible solution to make howdy work with python3 and delete python2 once and for all, I followed the links @imahaja suggested and wrote the PKGBUILD for the aforementioned fork pam-python-git. It's a fork not an upstream development, but since upstream's last push was on 2020-11-10 I think I safely assumed that castLabs's fork should work better in our situation.

If someone want to use @mika.cousin's patch, it's possible to edit the PKGBUILD directly and let makepkg handle it by itself by adding a patch file (here py3.patch):

source=(
        "https://github.com/boltgolt/howdy/archive/v${pkgver}.tar.gz"
        "https://github.com/davisking/dlib-models/raw/master/dlib_face_recognition_resnet_model_v1.dat.bz2"
        "https://github.com/davisking/dlib-models/raw/master/mmod_human_face_detector.dat.bz2"
        "https://github.com/davisking/dlib-models/raw/master/shape_predictor_5_face_landmarks.dat.bz2"
        "py3.patch"
)
sha256sums=('f3f48599f78fd82b049539fcfc34de25c9435cad732697bdda94e85352964794'
            'abb1f61041e434465855ce81c2bd546e830d28bcbed8d27ffbe5bb408b11553a'
            'db9e9e40f092c118d5eb3e643935b216838170793559515541c56a2b50d9fc84'
            '6e787bbebf5c9efdb793f6cd1f023230c4413306605f24f299f12869f95aa472'
            '1b9a8a75d4b1467c9bf7f0dc850705acbe3aff8b9014738dd6827f572e7802ef')
prepare() {
        patch --directory="$pkgname-$pkgver" --forward --strip=0 --input="${srcdir}/py3.patch"
}

With the same content as @mika.cousin's:

--- src/pam.py.orig 2022-09-28 08:52:52.688215296 +0200
+++ src/pam.py      2022-09-28 08:53:34.032714076 +0200
@@ -7,10 +7,10 @@
 import syslog

 # pam-python is running python 2, so we use the old module here
-import ConfigParser
+import configparser

 # Read config from disk
-config = ConfigParser.ConfigParser()
+config = configparser.ConfigParser()
 config.read(os.path.dirname(os.path.abspath(__file__)) + "/config.ini")

With that all seems to work fine but now I have 3 lines of warnings each time I'm using the IR camera for authentication:

[ WARN:0@0.200] global /build/opencv/src/opencv-4.6.0/modules/videoio/src/cap_gstreamer.cpp (2401) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module source reported: Could not read from resource.
[ WARN:0@0.200] global /build/opencv/src/opencv-4.6.0/modules/videoio/src/cap_gstreamer.cpp (1356) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@0.200] global /build/opencv/src/opencv-4.6.0/modules/videoio/src/cap_gstreamer.cpp (862) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created

As anyone got the same and was able to fix this? I might be interested!

@iyanmv I was able to use howdy without python2:

• Install pam-python-git which uses python3,

• After, patch /lib/security/howdy/pam.py with

---pam.py.orig 2022-09-26 20:43:15.801319200 +0200
+++ pam.py 2022-09-26 20:37:29.315681336 +0200
@@ -7.10 +7.10 @@
  import syslog

  # pam-python is running python 2, so we use the old module here
-import ConfigParser
+import configparser

  # Read config from disk
-config = ConfigParser.ConfigParser()
+config = configparser.ConfigParser()
  config.read(os.path.dirname(os.path.abspath(__file__)) + "/config.ini")

• Don't forget to edit files in /etc/pam.d/ to use pam_python3.so rather than pam_python.so

@iyanmv Yes it is possible to install pam-python with python3. As mentioned here, the branch py3 of fork by anders_blomdell supports installing the library using python3.