2.4 alpha2 failing on windows 10

[Thibaut Cuvelier]

On Fri, 12 Feb 2021 at 06:46, Richard Kimberly Heck <rikiheck at lyx.org>
wrote:

> On 2/11/21 11:19 PM, Thibaut Cuvelier wrote:
>
> On Thu, 11 Feb 2021 at 20:52, Thibaut Cuvelier <tcuvelier at lyx.org> wrote:
>
>> On Thu, 11 Feb 2021 at 20:05, José Abílio Matos <jamatos at lyx.org> wrote:
>>
>>> On Thursday, February 11, 2021 4:02:19 PM WET Yu Jin wrote:
>>> > Will be pointless imo, it's not the script's fault that python is not
>>> found.
>>> > The fault is to be searched in the part of code which adds the prefix
>>> path
>>> > to the environment, which part would that be? After all when
>>> installing,
>>> > the installer adds the prefix path to its environment too on runtime
>>> while
>>> > installing and then calls the script, it is successful then.
>>>
>>> Does Tools->Reconfigure works after adding the python path in the
>>> environment
>>> variable?
>>>
>>> I expect it to work. If it works that means that the configure.py
>>> changes are
>>> not the culprit.
>>>
>>
>> In my case, LyX can reconfigure once its PATH includes Python.
>>
>
> I just checked that the situation is quite weird: in Tools > Preferences >
> Paths, I have "C:\Program Files\MiKTeX
> 2.9\miktex\bin\x64;$LyXDir\bin;$LyXDir\Python;$LyXDir\Python\Lib;$LyXDir\imagemagick;$LyXDir\ghostscript\bin",
> meaning that LyX should really consider its built-in version of Python, but
> (re)configure always fails if Python is not in the environment variable
> PATH does not contain Python before LyX starts.
>
> Does it fail if you try to reconfigure once LyX has launched? If so, can
> you please open View> Messages, then activate "Files Used By LyX", and
> reconfigure? I see, at the top
>
> 00:43:30.779: python3 -tt "/usr/local/share/lyx/configure.py"
> --binary-dir="/usr/local/bin/"
>
> That is the command LyX is using to try to reconfigure.
>
> Maybe we need also to check what the environment is at that point?
>

 Here is what I get (a full LyX session with two calls to reconfigure):

14:30:52.923: Running configure...
>
> 14:30:56.919: python -tt "C:/Program Files/LyX 2.4/Resources/configure.py"
> --binary-dir="C:/Program Files/LyX 2.4/bin/"
>
> 14:30:57.187: Python was not found; run without arguments to install from
> the Microsoft Store, or disable this shortcut from Settings > Manage App
> Execution Aliases.
>
> 14:30:57.187: Reloading configuration...Manually looking for python in
> PATH ...
>
> Examining "C:/Program Files/MiKTeX 2.9/miktex/bin/x64/pythontex.exe"
>
> Examining "C:/Users/Thibaut/AppData/Local/Microsoft/WindowsApps/python.exe"
>
> Examining
> "C:/Users/Thibaut/AppData/Local/Microsoft/WindowsApps/python3.exe"
>
> Examining "C:/Users/Thibaut/AppData/Local/Microsoft/WindowsApps/python.exe"
>
> Examining
> "C:/Users/Thibaut/AppData/Local/Microsoft/WindowsApps/python3.exe"
>
> Warning: No python v2.x or 3.x binary found.
>
> LyX: reconfiguring user directory
>
> support\Systemcall.cpp (291): Systemcall: 'python -tt "C:/Program
> Files/LyX 2.4/Resources/configure.py" --binary-dir="C:/Program Files/LyX
> 2.4/bin/"' finished with exit code 9009
>
> LyX: Done!
>
> 14:31:06.641: (reconfigure)
>
> 14:31:21.627: Running configure...
>
> 14:31:21.766: python -tt "C:/Program Files/LyX 2.4/Resources/configure.py"
> --binary-dir="C:/Program Files/LyX 2.4/bin/"
>
> 14:31:22.099: Python was not found; run without arguments to install from
> the Microsoft Store, or disable this shortcut from Settings > Manage App
> Execution Aliases.
>
> 14:31:22.103: Reloading configuration...LyX: reconfiguring user directory
>
> support\Systemcall.cpp (291): Systemcall: 'python -tt "C:/Program
> Files/LyX 2.4/Resources/configure.py" --binary-dir="C:/Program Files/LyX
> 2.4/bin/"' finished with exit code 9009
>
> LyX: Done!
>
> 14:31:23.273: (reconfigure)
>
> 14:32:30.743: (dialog-toggle progress)
>

It really seems like LyX is getting the "standard" python.exe that just
shows a message and returns an error instead of its own Python (or any
other one from the path).
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