BaseTools: Update PYTHON env to PYTHON_COMMAND

Update PYTHON env to PYTHON_COMMAND.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

40 files changed, 164 insertions, 108 deletions

diff --git a/BaseTools/Bin/CYGWIN_NT-5.1-i686/Ecc b/BaseTools/Bin/CYGWIN_NT-5.1-i686/Ecc
index 8532fe510d..1ba451cf5e 100755
--- a/BaseTools/Bin/CYGWIN_NT-5.1-i686/Ecc
+++ b/BaseTools/Bin/CYGWIN_NT-5.1-i686/Ecc
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenDepex b/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenDepex
index 8532fe510d..1ba451cf5e 100755
--- a/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenDepex
+++ b/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenDepex
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenFds b/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenFds
index 8532fe510d..1ba451cf5e 100755
--- a/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenFds
+++ b/BaseTools/Bin/CYGWIN_NT-5.1-i686/GenFds
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/Bin/CYGWIN_NT-5.1-i686/TargetTool b/BaseTools/Bin/CYGWIN_NT-5.1-i686/TargetTool
index 8532fe510d..1ba451cf5e 100755
--- a/BaseTools/Bin/CYGWIN_NT-5.1-i686/TargetTool
+++ b/BaseTools/Bin/CYGWIN_NT-5.1-i686/TargetTool
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/Bin/CYGWIN_NT-5.1-i686/Trim b/BaseTools/Bin/CYGWIN_NT-5.1-i686/Trim
index 54e09c039b..b53b79bba4 100755
--- a/BaseTools/Bin/CYGWIN_NT-5.1-i686/Trim
+++ b/BaseTools/Bin/CYGWIN_NT-5.1-i686/Trim
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/Bin/CYGWIN_NT-5.1-i686/build b/BaseTools/Bin/CYGWIN_NT-5.1-i686/build
index 8532fe510d..1ba451cf5e 100755
--- a/BaseTools/Bin/CYGWIN_NT-5.1-i686/build
+++ b/BaseTools/Bin/CYGWIN_NT-5.1-i686/build
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/BPDG b/BaseTools/BinWrappers/PosixLike/BPDG
index e9f570b52c..c894384908 100755
--- a/BaseTools/BinWrappers/PosixLike/BPDG
+++ b/BaseTools/BinWrappers/PosixLike/BPDG
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/Ecc b/BaseTools/BinWrappers/PosixLike/Ecc
index ed4b7cd384..15edf52106 100755
--- a/BaseTools/BinWrappers/PosixLike/Ecc
+++ b/BaseTools/BinWrappers/PosixLike/Ecc
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/GenDepex b/BaseTools/BinWrappers/PosixLike/GenDepex
index d99e54f222..183cf58224 100755
--- a/BaseTools/BinWrappers/PosixLike/GenDepex
+++ b/BaseTools/BinWrappers/PosixLike/GenDepex
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/GenFds b/BaseTools/BinWrappers/PosixLike/GenFds
index e9f570b52c..c894384908 100755
--- a/BaseTools/BinWrappers/PosixLike/GenFds
+++ b/BaseTools/BinWrappers/PosixLike/GenFds
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable b/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable
+++ b/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/GenerateCapsule b/BaseTools/BinWrappers/PosixLike/GenerateCapsule
index 91bbd22738..023048c61d 100755
--- a/BaseTools/BinWrappers/PosixLike/GenerateCapsule
+++ b/BaseTools/BinWrappers/PosixLike/GenerateCapsule
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/PatchPcdValue b/BaseTools/BinWrappers/PosixLike/PatchPcdValue
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/PatchPcdValue
+++ b/BaseTools/BinWrappers/PosixLike/PatchPcdValue
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/Pkcs7Sign b/BaseTools/BinWrappers/PosixLike/Pkcs7Sign
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/Pkcs7Sign
+++ b/BaseTools/BinWrappers/PosixLike/Pkcs7Sign
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys
index b42a126840..ea71c7c61a 100755
--- a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys
+++ b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign
+++ b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/TargetTool b/BaseTools/BinWrappers/PosixLike/TargetTool
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/TargetTool
+++ b/BaseTools/BinWrappers/PosixLike/TargetTool
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/Trim b/BaseTools/BinWrappers/PosixLike/Trim
index d64b834006..1dd28e9662 100755
--- a/BaseTools/BinWrappers/PosixLike/Trim
+++ b/BaseTools/BinWrappers/PosixLike/Trim
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/UPT b/BaseTools/BinWrappers/PosixLike/UPT
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/UPT
+++ b/BaseTools/BinWrappers/PosixLike/UPT
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/PosixLike/build b/BaseTools/BinWrappers/PosixLike/build
index d8b8b8f145..f3770eed42 100755
--- a/BaseTools/BinWrappers/PosixLike/build
+++ b/BaseTools/BinWrappers/PosixLike/build
@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 #python `dirname $0`/RunToolFromSource.py `basename $0` $*
 
-# If a ${PYTHON} command is available, use it in preference to python
-if command -v ${PYTHON} >/dev/null 2>&1; then
-    python_exe=${PYTHON}
+# If a ${PYTHON_COMMAND} command is available, use it in preference to python
+if command -v ${PYTHON_COMMAND} >/dev/null 2>&1; then
+    python_exe=${PYTHON_COMMAND}
 fi
 
 full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a discussion of why $0 is not a good choice here
diff --git a/BaseTools/BinWrappers/WindowsLike/BPDG.bat b/BaseTools/BinWrappers/WindowsLike/BPDG.bat
index 4a43e5353e..f43dba81f1 100644
--- a/BaseTools/BinWrappers/WindowsLike/BPDG.bat
+++ b/BaseTools/BinWrappers/WindowsLike/BPDG.bat
@@ -1,4 +1,4 @@
 @setlocal

 @set ToolName=%~n0%

 @set PYTHONPATH=%PYTHONPATH%;%BASE_TOOLS_PATH%\Source\Python

-@%PYTHON% -m %ToolName%.%ToolName% %*

+@%PYTHON_COMMAND% -m %ToolName%.%ToolName% %*

diff --git a/BaseTools/BinWrappers/WindowsLike/Ecc.bat b/BaseTools/BinWrappers/WindowsLike/Ecc.bat
index e63ef50135..ba1a15b3b8 100644
--- a/BaseTools/BinWrappers/WindowsLike/Ecc.bat
+++ b/BaseTools/BinWrappers/WindowsLike/Ecc.bat
@@ -1,4 +1,4 @@
 @setlocal

 @set ToolName=%~n0%

 @set PYTHONPATH=%PYTHONPATH%;%BASE_TOOLS_PATH%\Source\Python

-@%PYTHON% -m %ToolName%.EccMain %*

+@%PYTHON_COMMAND% -m %ToolName%.EccMain %*

diff --git a/BaseTools/BinWrappers/WindowsLike/GenDepex.bat b/BaseTools/BinWrappers/WindowsLike/GenDepex.bat
index 6c7250f008..f8f3eefacf 100644
--- a/BaseTools/BinWrappers/WindowsLike/GenDepex.bat
+++ b/BaseTools/BinWrappers/WindowsLike/GenDepex.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\AutoGen\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\AutoGen\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/GenFds.bat b/BaseTools/BinWrappers/WindowsLike/GenFds.bat
index 4a43e5353e..f43dba81f1 100644
--- a/BaseTools/BinWrappers/WindowsLike/GenFds.bat
+++ b/BaseTools/BinWrappers/WindowsLike/GenFds.bat
@@ -1,4 +1,4 @@
 @setlocal

 @set ToolName=%~n0%

 @set PYTHONPATH=%PYTHONPATH%;%BASE_TOOLS_PATH%\Source\Python

-@%PYTHON% -m %ToolName%.%ToolName% %*

+@%PYTHON_COMMAND% -m %ToolName%.%ToolName% %*

diff --git a/BaseTools/BinWrappers/WindowsLike/GenPatchPcdTable.bat b/BaseTools/BinWrappers/WindowsLike/GenPatchPcdTable.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/GenPatchPcdTable.bat
+++ b/BaseTools/BinWrappers/WindowsLike/GenPatchPcdTable.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/GenerateCapsule.bat b/BaseTools/BinWrappers/WindowsLike/GenerateCapsule.bat
index 1ab7d33f98..11b4a48aec 100644
--- a/BaseTools/BinWrappers/WindowsLike/GenerateCapsule.bat
+++ b/BaseTools/BinWrappers/WindowsLike/GenerateCapsule.bat
@@ -1 +1 @@
-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\Capsule\GenerateCapsule.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\Capsule\GenerateCapsule.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/PatchPcdValue.bat b/BaseTools/BinWrappers/WindowsLike/PatchPcdValue.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/PatchPcdValue.bat
+++ b/BaseTools/BinWrappers/WindowsLike/PatchPcdValue.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/Pkcs7Sign.bat b/BaseTools/BinWrappers/WindowsLike/Pkcs7Sign.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/Pkcs7Sign.bat
+++ b/BaseTools/BinWrappers/WindowsLike/Pkcs7Sign.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256GenerateKeys.bat b/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256GenerateKeys.bat
index 32da349b31..6d4443b608 100644
--- a/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256GenerateKeys.bat
+++ b/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256GenerateKeys.bat
@@ -1 +1 @@
-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\Rsa2048Sha256Sign\Rsa2048Sha256GenerateKeys.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\Rsa2048Sha256Sign\Rsa2048Sha256GenerateKeys.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256Sign.bat b/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256Sign.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256Sign.bat
+++ b/BaseTools/BinWrappers/WindowsLike/Rsa2048Sha256Sign.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/TargetTool.bat b/BaseTools/BinWrappers/WindowsLike/TargetTool.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/TargetTool.bat
+++ b/BaseTools/BinWrappers/WindowsLike/TargetTool.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/Trim.bat b/BaseTools/BinWrappers/WindowsLike/Trim.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/Trim.bat
+++ b/BaseTools/BinWrappers/WindowsLike/Trim.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/UPT.bat b/BaseTools/BinWrappers/WindowsLike/UPT.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/UPT.bat
+++ b/BaseTools/BinWrappers/WindowsLike/UPT.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/BinWrappers/WindowsLike/build.bat b/BaseTools/BinWrappers/WindowsLike/build.bat
index 82e0a90d6c..9616cd893b 100644
--- a/BaseTools/BinWrappers/WindowsLike/build.bat
+++ b/BaseTools/BinWrappers/WindowsLike/build.bat
@@ -1,3 +1,3 @@
 @setlocal

 @set ToolName=%~n0%

-@%PYTHON% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

+@%PYTHON_COMMAND% %BASE_TOOLS_PATH%\Source\Python\%ToolName%\%ToolName%.py %*

diff --git a/BaseTools/Makefile b/BaseTools/Makefile
index 2569ea2ff4..de98e0b617 100644
--- a/BaseTools/Makefile
+++ b/BaseTools/Makefile
@@ -20,17 +20,21 @@ SUBDIRS = $(BASE_TOOLS_PATH)\Source\C $(BASE_TOOLS_PATH)\Source\Python
 all: c

 

 c :

-  @$(PYTHON) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  all $(BASE_TOOLS_PATH)\Source\C

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  all $(BASE_TOOLS_PATH)\Source\C

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  all $(BASE_TOOLS_PATH)\Source\C

 

 

 subdirs: $(SUBDIRS)

-  @$(PYTHON) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  all $**

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  all $**

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  all $**

 

 .PHONY: clean

 clean:

-  $(PYTHON) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py clean $(SUBDIRS)

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py clean $(SUBDIRS)

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py clean $(SUBDIRS)

 

 .PHONY: cleanall

 cleanall:

-  $(PYTHON) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  cleanall $(SUBDIRS)

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  cleanall $(SUBDIRS)

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe $(BASE_TOOLS_PATH)\Source\C\Makefiles\NmakeSubdirs.py  cleanall $(SUBDIRS)

 

diff --git a/BaseTools/Source/C/Makefile b/BaseTools/Source/C/Makefile
index dd39661272..08f0081212 100644
--- a/BaseTools/Source/C/Makefile
+++ b/BaseTools/Source/C/Makefile
@@ -38,7 +38,8 @@ libs: $(LIBRARIES)
 	@echo # Build libraries

 	@echo ######################

 	@if not exist $(LIB_PATH) mkdir $(LIB_PATH)

-	@$(PYTHON) Makefiles\NmakeSubdirs.py all $**

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) Makefiles\NmakeSubdirs.py all $**

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe Makefiles\NmakeSubdirs.py all $**

 

 apps: $(APPLICATIONS)

 	@echo.

@@ -46,7 +47,8 @@ apps: $(APPLICATIONS)
 	@echo # Build executables

 	@echo ######################

 	@if not exist $(BIN_PATH) mkdir $(BIN_PATH)

-	@$(PYTHON) Makefiles\NmakeSubdirs.py all $**

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) Makefiles\NmakeSubdirs.py all $**

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe Makefiles\NmakeSubdirs.py all $**

 

 install: $(LIB_PATH) $(BIN_PATH)

 	@echo.

@@ -60,11 +62,13 @@ install: $(LIB_PATH) $(BIN_PATH)
 

 .PHONY: clean

 clean:

-  @$(PYTHON) Makefiles\NmakeSubdirs.py clean $(LIBRARIES) $(APPLICATIONS)

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) Makefiles\NmakeSubdirs.py clean $(LIBRARIES) $(APPLICATIONS)

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe Makefiles\NmakeSubdirs.py clean $(LIBRARIES) $(APPLICATIONS)

 

 .PHONY: cleanall

 cleanall:

-  @$(PYTHON) Makefiles\NmakeSubdirs.py cleanall $(LIBRARIES) $(APPLICATIONS)

+  @if defined PYTHON_COMMAND $(PYTHON_COMMAND) $(PYTHON_COMMAND) Makefiles\NmakeSubdirs.py cleanall $(LIBRARIES) $(APPLICATIONS)

+  @if not defined PYTHON_COMMAND $(PYTHON_HOME)\python.exe $(PYTHON_COMMAND) Makefiles\NmakeSubdirs.py cleanall $(LIBRARIES) $(APPLICATIONS)

 

 !INCLUDE Makefiles\ms.rule

 

diff --git a/BaseTools/Source/Python/build/build.py b/BaseTools/Source/Python/build/build.py
index b5b969e876..c2b22cca70 100644
--- a/BaseTools/Source/Python/build/build.py
+++ b/BaseTools/Source/Python/build/build.py
@@ -796,7 +796,8 @@ class Build():
             if PYTHON3_ENABLE != "TRUE":

                 PYTHON3_ENABLE = "FALSE"

             EdkLogger.quiet("%-16s = %s" % ("PYTHON3_ENABLE", PYTHON3_ENABLE))

-        EdkLogger.quiet("%-16s = %s" % ("PYTHON", os.environ["PYTHON"]))

+        if "PYTHON_COMMAND" in os.environ:

+            EdkLogger.quiet("%-16s = %s" % ("PYTHON_COMMAND", os.environ["PYTHON_COMMAND"]))

         self.InitPreBuild()

         self.InitPostBuild()

         if self.Prebuild:

diff --git a/BaseTools/Tests/GNUmakefile b/BaseTools/Tests/GNUmakefile
index d6f4e1908b..3eb52b3f83 100644
--- a/BaseTools/Tests/GNUmakefile
+++ b/BaseTools/Tests/GNUmakefile
@@ -14,7 +14,7 @@
 all: test

 

 test:

-	@if command -v $(PYTHON) >/dev/null 1; then $(PYTHON) RunTests.py; else python RunTests.py; fi

+	@if command -v $(PYTHON_COMMAND) >/dev/null 1; then $(PYTHON_COMMAND) RunTests.py; else python RunTests.py; fi

 

 clean:

 	find . -name '*.pyc' -exec rm '{}' ';'

diff --git a/BaseTools/Tests/PythonTest.py b/BaseTools/Tests/PythonTest.py
new file mode 100644
index 0000000000..cd49dc5b5d
--- /dev/null
+++ b/BaseTools/Tests/PythonTest.py
@@ -0,0 +1,15 @@
+## @file

+# Test whether PYTHON_COMMAND is available

+#

+# Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>

+# This program and the accompanying materials

+# are licensed and made available under the terms and conditions of the BSD License

+# which accompanies this distribution.  The full text of the license may be found at

+# http://opensource.org/licenses/bsd-license.php

+#

+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,

+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

+#

+

+if __name__ == '__main__':

+    print('TRUE')

diff --git a/BaseTools/toolsetup.bat b/BaseTools/toolsetup.bat
index 811b23051f..6fe63e4baa 100755
--- a/BaseTools/toolsetup.bat
+++ b/BaseTools/toolsetup.bat
@@ -286,43 +286,77 @@ goto check_build_environment
   )

 

 :defined_python

+if defined PYTHON_COMMAND if not defined PYTHON3_ENABLE (

+  goto check_python_available

+)

 if defined PYTHON3_ENABLE (

   if "%PYTHON3_ENABLE%" EQU "TRUE" (

-    set PYTHON=py -3

-    %PYTHON% --version >NUL 2>&1

-    if %ERRORLEVEL% NEQ 0 (

+    set PYTHON_COMMAND=py -3

+    goto check_python_available

+  ) else (

+    goto check_python2

+  )

+)

+if not defined PYTHON_COMMAND if not defined PYTHON3_ENABLE (

+  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" (

+    if not defined PYTHON_HOME if not defined PYTHONHOME (

+      endlocal

+      set PYTHON_COMMAND=

       echo.

-      echo !!! ERROR !!!  PYTHON3 is not installed or added to environment variables

+      echo !!! ERROR !!! Binary python tools are missing.

+      echo PYTHON_COMMAND, PYTHON3_ENABLE or PYTHON_HOME

+      echo Environment variable is not set successfully.

+      echo They is required to build or execute the python tools.

       echo.

       goto end

     ) else (

-      goto check_freezer_path

+      goto check_python2

     )

-  ) 

+  ) else (

+    goto check_freezer_path

+  )

 )

 

+:check_python2

+endlocal

 if defined PYTHON_HOME (

   if EXIST "%PYTHON_HOME%" (

-    set PYTHON=%PYTHON_HOME%\python.exe

-    goto check_freezer_path

-    )

+    set PYTHON_COMMAND=%PYTHON_HOME%\python.exe

+    goto check_python_available

   )

+)

 if defined PYTHONHOME (

   if EXIST "%PYTHONHOME%" (

     set PYTHON_HOME=%PYTHONHOME%

-    set PYTHON=%PYTHON_HOME%\python.exe

+    set PYTHON_COMMAND=%PYTHON_HOME%\python.exe

+    goto check_python_available

+  )

+)

+echo.

+echo !!! ERROR !!!  PYTHON_HOME is not defined or The value of this variable does not exist

+echo.

+goto end

+:check_python_available

+%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%" is not installed or added to environment variables

+    echo.

+    goto end

+  ) else (

     goto check_freezer_path

-    )

   )

-  

-  echo.

-  echo !!! ERROR !!! Binary python tools are missing.

-  echo PYTHON_HOME or PYTHON3_ENABLE environment variable is not set successfully.

-  echo PYTHON_HOME or PYTHON3_ENABLE is required to build or execute the python tools.

-  echo.

-  goto end

 

 :check_freezer_path

+  endlocal

   if defined BASETOOLS_PYTHON_SOURCE goto print_python_info

   set "PATH=%BASE_TOOLS_PATH%\BinWrappers\WindowsLike;%PATH%"

   set BASETOOLS_PYTHON_SOURCE=%BASE_TOOLS_PATH%\Source\Python

@@ -330,14 +364,12 @@ if defined PYTHONHOME (
 

 :print_python_info

   echo                PATH = %PATH%

-  if "%PYTHON3_ENABLE%" EQU "TRUE" (

+  if defined PYTHON3_ENABLE if "%PYTHON3_ENABLE%" EQU "TRUE" (

     echo      PYTHON3_ENABLE = %PYTHON3_ENABLE%

-    echo             PYTHON3 = %PYTHON%

+    echo             PYTHON3 = %PYTHON_COMMAND%

   ) else (

-    echo      PYTHON3_ENABLE = %PYTHON3_ENABLE%

-    if defined PYTHON_HOME (

-      echo         PYTHON_HOME = %PYTHON_HOME%

-    )

+    echo      PYTHON3_ENABLE = FALSE

+    echo      PYTHON_COMMAND = %PYTHON_COMMAND%

   )

   echo          PYTHONPATH = %PYTHONPATH%

   echo.