lint.sh: check shebang format for bash + python3 (#33286)

lint shebang

scripts/lint/check_shebang_format.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+FAIL=0
+
+if grep '^#!.*python$' $@ | grep -v '#!/usr/bin/env python3$'; then
+  echo -e "Invalid shebang! Must use '#!/usr/bin/env python3'\n"
+  FAIL=1
+fi
+
+if grep '^#!.*bash$' $@ | grep -v '#!/usr/bin/env bash$'; then
+  echo -e "Invalid shebang! Must use '#!/usr/bin/env bash'"
+  FAIL=1
+fi
+
+exit $FAIL

scripts/lint/lint.sh

@@ -8,7 +8,7 @@ BOLD='\033[1m'
 NC='\033[0m'
 
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
-cd $DIR/../
+cd $DIR/../../
 
 FAILED=0
 
@@ -51,6 +51,7 @@ function run_tests() {
   run "lint-imports" lint-imports
   run "check_added_large_files" python3 -m pre_commit_hooks.check_added_large_files --enforce-all $ALL_FILES --maxkb=120
   run "check_shebang_scripts_are_executable" python3 -m pre_commit_hooks.check_shebang_scripts_are_executable $ALL_FILES
+  run "check_shebang_format" $DIR/check_shebang_format.sh $ALL_FILES
 
   if [[ -z "$FAST" ]]; then
     run "mypy" mypy $PYTHON_FILES