cdm_path = translate_path(to_unicode(addon.getSetting('DECRYPTERPATH'))) in widevine.py leads to empty path and error

[BarkVeryLittle]

Hi

I am running LibreElec 12.0.1. on a Raspberry Pi 4. When trying to install widevine via inputstreamhelper I got the following error and widevine was not installed:

2024-12-27 23:50:45.495 T:1706  warning <general>: [script.module.inputstreamhelper] Recursively create directory ''.
2024-12-27 23:50:45.497 T:1706     info <general>: Skipped 1 duplicate messages..
2024-12-27 23:50:45.497 T:1706    error <general>: [script.module.inputstreamhelper] Widevine CDM is not installed.
2024-12-27 23:50:45.499 T:1706  warning <general>: [script.module.inputstreamhelper] Recursively create directory ''.
2024-12-27 23:50:45.510 T:1706    error <general>: EXCEPTION Thrown (PythonToCppException) : -->Python callback/script returned the following error<--
NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
Error Type: <class 'FileNotFoundError'>
Error Contents: [Errno 2] No such file or directory: ''
Traceback (most recent call last):
File "/storage/.kodi/addons/script.module.inputstreamhelper/default.py", line 8, in <module>run(sys.argv)
File "/storage/.kodi/addons/script.module.inputstreamhelper/lib/inputstreamhelper/api.py", line 15, in run widevine_install(choose_version=params[2])
File "/storage/.kodi/addons/script.module.inputstreamhelper/lib/inputstreamhelper/api.py", line 48, in widevine_install Helper('mpd', drm='widevine').install_widevine(choose_version=choose_version)
File "/storage/.kodi/addons/script.module.inputstreamhelper/lib/inputstreamhelper/__init__.py", line 38, in clean_before_after self.cleanup()
File "/storage/.kodi/addons/script.module.inputstreamhelper/lib/inputstreamhelper/__init__.py", line 388, in cleanup
File "/storage/.kodi/addons/script.module.inputstreamhelper/lib/inputstreamhelper/utils.py", line 360, in remove_tree rmtree(compat_path(path))
File "/usr/lib/python3.11/shutil.py", line 742, in rmtree
File "/usr/lib/python3.11/shutil.py", line 740, in rmtree
FileNotFoundError: [Errno 2] No such file or directory: ''
-->End of Python script error report<--

I figured out that replacing
cdm_path = `translate_path(to_unicode(addon.getSetting('DECRYPTERPATH')))
in line 120 in widevine.py with
cdm_path = translate_path(os.path.join('special://home/', 'cdm'))

resolved the issue.

Prior to this I already copied <setting id="DECRYPTERPATH" default="true">special://storage/.kodi/cdm/</setting> from .kodi/userdata/addon_data/inputstream.adaptive/settings.xml to .kodi/userdata/addon_data/script.module.inputstreamhelper/settings.xml yet that didn't help.

To be honest I don't know, if my solution is ideal (yet the DAZN plug I initially tried to get to work still doesn't work), but since I did not find anything about this, I though I might share this. Maybe it helps anybody or you get any insights from this.