Discussion

@echo off is a global setting, changing the caller's state, and shouldn't be used without a preceding setlocal. Alternatively, if you want to pass environmental state back up to the caller, both setlocal and echo off can be removed, and commands in the BAT/CMD file prefixed with an "@" to suppress display, eg:

@REM Invoke buck.pex in the same directory as this script with python
@REM We try to find a python2 installation first because python3 can
@REM install itself as 'python.exe' on the path, and we don't want that
@REM just yet
@if exist "C:\Python27\python.exe" @(
  C:\Python27\python.exe %~dp0\buck.pex %*
) else @(
  python %~dp0\buck.pex %*
)

But I don't see that you need that, so this would be the simpler fix.

Fix global use of `@echo off` within chocolatey BAT file

Discussion