SERVER-48188 Allow multiversion *_gen tasks to be rerun without fail

1 files changed, 12 insertions, 0 deletions

diff --git a/buildscripts/evergreen_gen_multiversion_tests.py b/buildscripts/evergreen_gen_multiversion_tests.py
index f66e908a68a..8687cc617a9 100755
--- a/buildscripts/evergreen_gen_multiversion_tests.py
+++ b/buildscripts/evergreen_gen_multiversion_tests.py
@@ -28,6 +28,8 @@ import buildscripts.evergreen_generate_resmoke_tasks as generate_resmoke
 from buildscripts.evergreen_generate_resmoke_tasks import Suite, ConfigOptions
 import buildscripts.evergreen_gen_fuzzer_tests as gen_fuzzer
 
+# pylint: disable=len-as-condition
+
 LOGGER = structlog.getLogger(__name__)
 
 REQUIRED_CONFIG_KEYS = {
@@ -361,6 +363,11 @@ class EvergreenMultiversionConfigGenerator(object):
         shrub_project.add_build_variant(build_variant)
         write_file_to_dir(CONFIG_DIR, f"{self.task}.json", shrub_project.json())
 
+        if len(os.listdir(CONFIG_DIR)) == 0:
+            raise RuntimeError(
+                f"Multiversion suite generator unexpectedly yielded no configuration in '{CONFIG_DIR}'"
+            )
+
 
 @click.group()
 def main():
@@ -433,6 +440,11 @@ def generate_exclude_yaml(suite: str, task_path_suffix: str, is_generated_suite:
         suite_yaml_dict[file_name] = generate_resmoke.generate_resmoke_suite_config(
             suite_config, file_name, excludes=list(files_to_exclude))
     else:
+        if not os.path.exists(CONFIG_DIR) or len(os.listdir(CONFIG_DIR)) == 0:
+            LOGGER.info(
+                f"No configuration files exist in '{CONFIG_DIR}'. Skipping exclude file generation")
+            return
+
         # We expect the generated suites to already have been generated in the generated config
         # directory.
         suites_dir = CONFIG_DIR