SERVER-55281 lint for newline violations

1 files changed, 8 insertions, 0 deletions

diff --git a/buildscripts/linter/simplecpplint.py b/buildscripts/linter/simplecpplint.py
index 3acf5a9d19f..11f7056d8bc 100644
--- a/buildscripts/linter/simplecpplint.py
+++ b/buildscripts/linter/simplecpplint.py
@@ -128,6 +128,7 @@ class Linter:
 
         start_line = self._check_for_server_side_public_license()
 
+        self._check_newlines()
         self._check_and_strip_comments()
 
         for linenum in range(start_line, len(self.clean_lines)):
@@ -150,6 +151,13 @@ class Linter:
 
         return self._error_count
 
+    def _check_newlines(self):
+        """Check that each source file ends with a newline character."""
+        if self.raw_lines and self.raw_lines[-1][-1:] != '\n':
+            self._error(
+                len(self.raw_lines), 'mongo/final_newline',
+                'Files must end with a newline character.')
+
     def _check_and_strip_comments(self):
         in_multi_line_comment = False