[PATCH v3 4/4] BaseTools: Update toolsetup.bat and Tests/PythonTest.py to check ver

["Rebecca Cran" <rebecca@bsdio.com>]

Update toolsetup.bat and Tests/PythonTest.py to check if we're running a
version of Python that's compatible with BaseTools and the Pip
BaseTools.

BaseTools uses syntax from Python 3.6 or newer, so set that as the minimum
version EDK2 requires.

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
---
 BaseTools/Tests/PythonTest.py | 22 ++++++-
 BaseTools/toolsetup.bat       | 61 +++++++++++---------
 2 files changed, 54 insertions(+), 29 deletions(-)

diff --git a/BaseTools/Tests/PythonTest.py b/BaseTools/Tests/PythonTest.py
index ec44c7947086..b87c78570eae 100644
--- a/BaseTools/Tests/PythonTest.py
+++ b/BaseTools/Tests/PythonTest.py
@@ -1,9 +1,27 @@
 ## @file
-# Test whether PYTHON_COMMAND is available
+# Test whether PYTHON_COMMAND is available and the
+# minimum Python version is installed.
 #
 # Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 
+import sys
+
 if __name__ == '__main__':
-    print('TRUE')
+    # Check if the major and minor versions required were specified.
+    if len(sys.argv) >= 3:
+        req_major_version = int(sys.argv[1])
+        req_minor_version = int(sys.argv[2])
+    else:
+        # If the minimum version wasn't specified on the command line,
+        # default to 3.6 because BaseTools uses syntax from PEP 526
+        # (https://peps.python.org/pep-0526/)
+        req_major_version = 3
+        req_minor_version = 6
+
+    if sys.version_info.major == req_major_version and \
+       sys.version_info.minor >= req_minor_version:
+        sys.exit(0)
+    else:
+        sys.exit(1)
diff --git a/BaseTools/toolsetup.bat b/BaseTools/toolsetup.bat
index 3d13e9fad286..dc6288effd7d 100755
--- a/BaseTools/toolsetup.bat
+++ b/BaseTools/toolsetup.bat
@@ -12,6 +12,8 @@
 @echo off
 pushd .
 set SCRIPT_ERROR=0
+set PYTHON_VER_MAJOR=3
+set PYTHON_VER_MINOR=6
 
 @REM ##############################################################
 @REM # You should not have to modify anything below this line
@@ -304,17 +306,19 @@ goto check_build_environment
      )
   )
 
-:defined_python
+@REM Check Python environment
 
 if not defined PYTHON_COMMAND (
   set PYTHON_COMMAND=py -3
-  py -3 %BASE_TOOLS_PATH%\Tests\PythonTest.py >PythonCheck.txt 2>&1
-  setlocal enabledelayedexpansion
-  set /p PythonCheck=<"PythonCheck.txt"
-  del PythonCheck.txt
-  if "!PythonCheck!" NEQ "TRUE" (
+  py -3 %BASE_TOOLS_PATH%\Tests\PythonTest.py %PYTHON_VER_MAJOR% %PYTHON_VER_MINOR% >NUL 2>NUL
+  if %ERRORLEVEL% EQU 1 (
+    echo.
+    echo !!! ERROR !!! Python %PYTHON_VER_MAJOR%.%PYTHON_VER_MINOR% or newer is required.
+    echo.
+    goto end
+  )
+  if %ERRORLEVEL% NEQ 0 (
     if not defined PYTHON_HOME if not defined PYTHONHOME (
-      endlocal
       set PYTHON_COMMAND=
       echo.
       echo !!! ERROR !!! Binary python tools are missing.
@@ -327,8 +331,6 @@ if not defined PYTHON_COMMAND (
   )
 )
 
-endlocal
-
 if defined PYTHON_HOME (
   if EXIST "%PYTHON_HOME%" (
     set PYTHON_COMMAND=%PYTHON_HOME%\python.exe
@@ -340,27 +342,30 @@ if defined PYTHON_HOME (
   )
 )
 
-%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Tests\PythonTest.py >PythonCheck.txt 2>&1
-  setlocal enabledelayedexpansion
-  set /p PythonCheck=<"PythonCheck.txt"
-  del PythonCheck.txt
-  if "!PythonCheck!" NEQ "TRUE" (
-    echo.
-    echo ! ERROR !  PYTHON_COMMAND="%PYTHON_COMMAND%" is not installed or added to environment variables
-    echo.
-    goto end
+%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Tests\PythonTest.py %PYTHON_VER_MAJOR% %PYTHON_VER_MINOR% >NUL 2>NUL
+if %ERRORLEVEL% EQU 1 (
+  echo.
+  echo !!! ERROR !!! Python %PYTHON_VER_MAJOR%.%PYTHON_VER_MINOR% or newer is required.
+  echo.
+  goto end
+)
+if %ERRORLEVEL% NEQ 0 (
+  echo.
+  echo !!! ERROR !!!  PYTHON_COMMAND="%PYTHON_COMMAND%" does not exist or is not a Python interpreter.
+  echo.
+  goto end
 )
 
 endlocal
 
-  %PYTHON_COMMAND% -c "import edk2basetools" >NUL 2>NUL
-  if %ERRORLEVEL% EQU 0 (
-    goto use_pip_basetools
-  ) else (
-    REM reset ERRORLEVEL
-    type nul>nul
-    goto use_builtin_basetools
-  )
+%PYTHON_COMMAND% -c "import edk2basetools" >NUL 2>NUL
+if %ERRORLEVEL% EQU 0 (
+  goto use_pip_basetools
+) else (
+  REM reset ERRORLEVEL
+  type nul>nul
+  goto use_builtin_basetools
+)
 
 :use_builtin_basetools
   @echo Using EDK2 in-source Basetools
@@ -444,5 +449,7 @@ set VS2019=
 set VS2017=
 set VS2015=
 set VSTool=
+set PYTHON_VER_MAJOR=
+set PYTHON_VER_MINOR=
+set SCRIPT_ERROR=
 popd
-
-- 
2.40.0.windows.1