1@rem
2@rem Searches for python.exe and may download a private copy from nuget.
3@rem
4@rem This file is supposed to modify the state of the caller (specifically
5@rem the MSBUILD variable), so we do not use setlocal or echo, and avoid
6@rem changing any other persistent state.
7@rem
8
9@set _Py_D=%~dp0
10
11@rem First argument -q means only show the command in output
12@if '%1' EQU '-q' (shift && set _Py_Quiet=1)
13
14@rem No arguments provided means do full search
15@if '%1' EQU '' goto :begin_search
16
17@rem One argument may be the full path. Use a goto so we don't try to
18@rem parse the next if statement - incorrect quoting in the multi-arg
19@rem case can cause us to break immediately.
20@if '%2' EQU '' goto :one_arg
21
22@rem Entire command line may represent the full path if quoting failed.
23@if exist "%*" (set PYTHON="%*") & (set _Py_Python_Source=from environment) & goto :found
24@goto :begin_search
25
26:one_arg
27@if exist "%~1" (set PYTHON="%~1") & (set _Py_Python_Source=from environment) & goto :found
28
29:begin_search
30@set PYTHON=
31
32@rem If there is an active virtual env, use that one
33@if NOT "%VIRTUAL_ENV%"=="" (set PYTHON="%VIRTUAL_ENV%\Scripts\python.exe") & (set _Py_Python_Source=found in virtual env) & goto :found
34
35@set _Py_EXTERNALS_DIR=%EXTERNALS_DIR%
36@if "%_Py_EXTERNALS_DIR%"=="" (set _Py_EXTERNALS_DIR=%_Py_D%\..\externals)
37
38@rem If we have Python in externals, use that one
39@if exist "%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe" ("%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe" -Ec "import sys; assert sys.version_info[:2] >= (3, 8)" >nul 2>nul) && (set PYTHON="%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe") && (set _Py_Python_Source=found in externals directory) && goto :found || rmdir /Q /S "%_Py_EXTERNALS_DIR%\pythonx86"
40
41@rem If HOST_PYTHON is recent enough, use that
42@if NOT "%HOST_PYTHON%"=="" @%HOST_PYTHON% -Ec "import sys; assert sys.version_info[:2] >= (3, 9)" >nul 2>nul && (set PYTHON="%HOST_PYTHON%") && (set _Py_Python_Source=found as HOST_PYTHON) && goto :found
43
44@rem If py.exe finds a recent enough version, use that one
45@for %%p in (3.10 3.9) do @py -%%p -EV >nul 2>&1 && (set PYTHON=py -%%p) && (set _Py_Python_Source=found %%p with py.exe) && goto :found
46
47@if NOT exist "%_Py_EXTERNALS_DIR%" mkdir "%_Py_EXTERNALS_DIR%"
48@set _Py_NUGET=%NUGET%
49@set _Py_NUGET_URL=%NUGET_URL%
50@set _Py_HOST_PYTHON=%HOST_PYTHON%
51@if "%_Py_HOST_PYTHON%"=="" set _Py_HOST_PYTHON=py
52@if "%_Py_NUGET%"=="" (set _Py_NUGET=%_Py_EXTERNALS_DIR%\nuget.exe)
53@if "%_Py_NUGET_URL%"=="" (set _Py_NUGET_URL=https://aka.ms/nugetclidl)
54@if NOT exist "%_Py_NUGET%" (
55    @echo Downloading nuget...
56    @rem NB: Must use single quotes around NUGET here, NOT double!
57    @rem Otherwise, a space in the path would break things
58    @rem If it fails, retry with any available copy of Python
59    @powershell.exe -Command Invoke-WebRequest %_Py_NUGET_URL% -OutFile '%_Py_NUGET%'
60    @if errorlevel 1 (
61        @%_Py_HOST_PYTHON% -E "%_Py_D%\urlretrieve.py" "%_Py_NUGET_URL%" "%_Py_NUGET%"
62    )
63)
64
65@if not "%_Py_Quiet%"=="1" @echo Installing Python via nuget...
66@"%_Py_NUGET%" install pythonx86 -ExcludeVersion -OutputDirectory "%_Py_EXTERNALS_DIR%"
67@rem Quote it here; it's not quoted later because "py -x.y" wouldn't work
68@if not errorlevel 1 (set PYTHON="%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe") & (set _Py_Python_Source=found on nuget.org) & goto :found
69
70
71@set _Py_D=
72@set _Py_Quiet=
73@set _Py_Python_Source=
74@set _Py_EXTERNALS_DIR=
75@set _Py_NUGET=
76@set _Py_NUGET_URL=
77@set _Py_HOST_PYTHON=
78@exit /b 1
79
80:found
81@if "%_Py_Quiet%"=="1" (@echo %PYTHON%) else @echo Using %PYTHON% (%_Py_Python_Source%)
82
83@set _Py_D=
84@set _Py_Quiet=
85@set _Py_Python_Source=
86@set _Py_EXTERNALS_DIR=
87@set _Py_NUGET=
88@set _Py_NUGET_URL=
89@set _Py_HOST_PYTHON=
90