[release script] Check for //NORELEASE in code before release

Lines in the code that should be removed before a release can be annotated with
//NORELEASE . This can be useful when debugging test failures. For example,
one might want to add additional logging that would be too verbose for production
and therfore should be removed before releasing.

closes elastic#10141

dev-tools/build_release.py

@@ -581,6 +581,20 @@ def ensure_checkout_is_clean(branchName):
   if 'is ahead' in s:
     raise RuntimeError('git status shows local commits; try running "git fetch origin", "git checkout %s", "git reset --hard origin/%s": got:\n%s' % (branchName, branchName, s))
 
+# Checks all source files for //NORELEASE comments
+def check_norelease(path='src'):
+  pattern = re.compile(r'\bnorelease\b', re.IGNORECASE)
+  for root, _, file_names in os.walk(path):
+    for file_name in fnmatch.filter(file_names, '*.java'):
+      full_path = os.path.join(root, file_name)
+      line_number = 0
+      with open(full_path, 'r', encoding='utf-8') as current_file:
+        for line in current_file:
+          line_number = line_number + 1
+          if pattern.search(line):
+            raise RuntimeError('Found //norelease comment in %s line %s' % (full_path, line_number))
+
+
 if __name__ == '__main__':
   parser = argparse.ArgumentParser(description='Builds and publishes a Elasticsearch Release')
   parser.add_argument('--branch', '-b', metavar='RELEASE_BRANCH', default=get_current_branch(),
@@ -624,6 +638,7 @@ def ensure_checkout_is_clean(branchName):
   print('  JAVA_HOME is [%s]' % JAVA_HOME)
   print('  Running with maven command: [%s] ' % (MVN))
   if build:
+    check_norelease(path='src')
     ensure_checkout_is_clean(src_branch)
     verify_lucene_version()
     release_version = find_release_version(src_branch)