[py2] Drop envvar to run scripts with py2

R=aravindvasudev@google.com

Change-Id: I4c2c8265296f8fa1c2ce9a1e4a0b31d1f1dd39f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4522398
Reviewed-by: Aravind Vasudevan <aravindvasudev@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@chromium.org>

fetch

@@ -9,13 +9,4 @@ base_dir=$(dirname "$0")
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$base_dir
 
-if [[ $GCLIENT_PY3 == 1 ]]; then
-  # Explicitly run on Python 3
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"
-elif [[ $GCLIENT_PY3 == 0 ]]; then
-  # Explicitly run on Python 2
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/fetch.py" "$@"
-else
-  # Run on Python 3, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"
-fi
+PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/fetch.py" "$@"

fetch.bat

@@ -16,13 +16,4 @@ IF %ERRORLEVEL% NEQ 0 (
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-IF "%GCLIENT_PY3%" == "1" (
-  :: Explicitly run on Python 3
-  call vpython3 "%~dp0\fetch.py" %*
-) ELSE IF "%GCLIENT_PY3%" == "0" (
-  :: Explicitly run on Python 2
-  call vpython "%~dp0\fetch.py" %*
-) ELSE (
-  :: Run on Python 3, allows default to be flipped.
-  call vpython3 "%~dp0\fetch.py" %*
-)
+call vpython3 "%~dp0\fetch.py" %*

gclient

@@ -26,13 +26,4 @@ fi
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$base_dir
 
-if [[ $GCLIENT_PY3 == 1 ]]; then
-  # Explicitly run on Python 3
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"
-elif [[ $GCLIENT_PY3 == 0 ]]; then
-  # Explicitly run on Python 2
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/gclient.py" "$@"
-else
-  # Run on Python 3, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"
-fi
+PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/gclient.py" "$@"

gclient.bat

@@ -20,13 +20,4 @@ IF %ERRORLEVEL% NEQ 0 (
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-IF "%GCLIENT_PY3%" == "1" (
-  :: Explicitly run on Python 3
-  call vpython3 "%~dp0gclient.py" %*
-) ELSE IF "%GCLIENT_PY3%" == "0" (
-  :: Explicitly run on Python 2
-  call vpython "%~dp0gclient.py" %*
-) ELSE (
-  :: Run on Python 3, allows default to be flipped.
-  call vpython3 "%~dp0gclient.py" %*
-)
+call vpython3 "%~dp0gclient.py" %*

python_runner.sh

@@ -48,13 +48,4 @@ SCRIPT="${SCRIPT-${BASENAME//-/_}.py}"
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$DEPOT_TOOLS
 
-if [[ $GCLIENT_PY3 = 1 ]]; then
-  # Explicitly run on Python 3
-  vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"
-elif [[ $GCLIENT_PY3 = 0 ]]; then
-  # Explicitly run on Python 2
-  vpython "$DEPOT_TOOLS/$SCRIPT" "$@"
-else
-  # Run on Python 3, allows default to be flipped.
-  vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"
-fi
+vpython3 "$DEPOT_TOOLS/$SCRIPT" "$@"

roll-dep

@@ -9,13 +9,4 @@ base_dir=$(dirname "$0")
 # standalone, but allow other PATH manipulations to take priority.
 PATH=$PATH:$base_dir
 
-if [[ $GCLIENT_PY3 = 1 ]]; then
-  # Explicitly run on Python 3
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
-elif [[ $GCLIENT_PY3 = 0 ]]; then
-  # Explicitly run on Python 2
-  PYTHONDONTWRITEBYTECODE=1 exec vpython "$base_dir/roll_dep.py" "$@"
-else
-  # Run on Python 2 for now, allows default to be flipped.
-  PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"
-fi
+PYTHONDONTWRITEBYTECODE=1 exec vpython3 "$base_dir/roll_dep.py" "$@"

roll-dep.bat

@@ -9,13 +9,4 @@ setlocal
 set PATH=%PATH%;%~dp0
 
 :: Defer control.
-IF "%GCLIENT_PY3%" == "1" (
-  :: Explicitly run on Python 3
-  call vpython3 "%~dp0\roll_dep.py" %*
-) ELSE IF "%GCLIENT_PY3%" == "0" (
-  :: Explicitly run on Python 2
-  call vpython "%~dp0\roll_dep.py" %*
-) ELSE (
-  :: Run on Python 3, allows default to be flipped.
-  call vpython3 "%~dp0\roll_dep.py" %*
-)
+call vpython3 "%~dp0\roll_dep.py" %*