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@rem No arguments provided means do full search 10@if '%1' EQU '' goto :begin_search 11 12@rem One argument may be the full path. Use a goto so we don't try to 13@rem parse the next if statement - incorrect quoting in the multi-arg 14@rem case can cause us to break immediately. 15@if '%2' EQU '' goto :one_arg 16 17@rem Entire command line may represent the full path if quoting failed. 18@if exist "%*" (set PYTHON="%*") & (set _Py_Python_Source=from environment) & goto :found 19@goto :begin_search 20 21:one_arg 22@if exist "%~1" (set PYTHON="%~1") & (set _Py_Python_Source=from environment) & goto :found 23 24:begin_search 25@set PYTHON= 26 27@set _Py_EXTERNALS_DIR=%EXTERNALS_DIR% 28@if "%_Py_EXTERNALS_DIR%"=="" (set _Py_EXTERNALS_DIR=%~dp0\..\externals) 29 30@rem If we have Python in externals, use that one 31@if exist "%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe" (set PYTHON="%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe") & (set _Py_Python_Source=found in externals directory) & goto :found 32 33@rem If HOST_PYTHON is recent enough, use that 34@if NOT "%HOST_PYTHON%"=="" @%HOST_PYTHON% -Ec "import sys; assert sys.version_info[:2] >= (3, 6)" >nul 2>nul && (set PYTHON="%HOST_PYTHON%") && (set _Py_Python_Source=found as HOST_PYTHON) && goto :found 35 36@rem If py.exe finds a recent enough version, use that one 37@for %%p in (3.7 3.6) do @py -%%p -EV >nul 2>&1 && (set PYTHON=py -%%p) && (set _Py_Python_Source=found %%p with py.exe) && goto :found 38 39@if NOT exist "%_Py_EXTERNALS_DIR%" mkdir "%_Py_EXTERNALS_DIR%" 40@set _Py_NUGET=%NUGET% 41@set _Py_NUGET_URL=%NUGET_URL% 42@set _Py_HOST_PYTHON=%HOST_PYTHON% 43@if "%_Py_HOST_PYTHON%"=="" set _Py_HOST_PYTHON=py 44@if "%_Py_NUGET%"=="" (set _Py_NUGET=%_Py_EXTERNALS_DIR%\nuget.exe) 45@if "%_Py_NUGET_URL%"=="" (set _Py_NUGET_URL=https://aka.ms/nugetclidl) 46@if NOT exist "%_Py_NUGET%" ( 47 @echo Downloading nuget... 48 @rem NB: Must use single quotes around NUGET here, NOT double! 49 @rem Otherwise, a space in the path would break things 50 @rem If it fails, retry with any available copy of Python 51 @powershell.exe -Command Invoke-WebRequest %_Py_NUGET_URL% -OutFile '%_Py_NUGET%' 52 @if errorlevel 1 ( 53 @%_Py_HOST_PYTHON% -E "%~dp0\urlretrieve.py" "%_Py_NUGET_URL%" "%_Py_NUGET%" 54 ) 55) 56@echo Installing Python via nuget... 57@"%_Py_NUGET%" install pythonx86 -ExcludeVersion -OutputDirectory "%_Py_EXTERNALS_DIR%" 58@rem Quote it here; it's not quoted later because "py -x.y" wouldn't work 59@if not errorlevel 1 (set PYTHON="%_Py_EXTERNALS_DIR%\pythonx86\tools\python.exe") & (set _Py_Python_Source=found on nuget.org) & goto :found 60 61 62@set _Py_Python_Source= 63@set _Py_EXTERNALS_DIR= 64@set _Py_NUGET= 65@set _Py_NUGET_URL= 66@set _Py_HOST_PYTHON= 67@exit /b 1 68 69:found 70@echo Using %PYTHON% (%_Py_Python_Source%) 71@set _Py_Python_Source= 72@set _Py_EXTERNALS_DIR= 73@set _Py_NUGET= 74@set _Py_NUGET_URL= 75@set _Py_HOST_PYTHON= 76