feat: auto find latest build results (#2517)

.cloud-build/utils/build_results_viewer.py

@@ -7,11 +7,16 @@ import argparse
 import json
 from  util import download_file
 import csv
+import datetime
+from google.cloud import storage
+
+BUILD_BUCKET = "cloud-build-notebooks-presubmit"
+BUILD_FOLDER = "build_results"
 
 
 parser = argparse.ArgumentParser()
 parser.add_argument('--file', dest='file',
-                    default='build.json', type=str, help='build results file')
+                    default=None, type=str, help='build results filei (local or GCS)')
 args = parser.parse_args()
 
 investigate = {}
@@ -20,6 +25,19 @@ with open('investigate.csv', 'r') as csvfile:
     for row in reader:
         investigate[row[0][:-6]] = row[1]
 
+if not args.file:
+    client = storage.Client()
+    blobs = client.list_blobs(BUILD_BUCKET, prefix=BUILD_FOLDER)
+    newest_time = datetime.datetime(2000, 1, 1)
+    for blob in blobs:
+        # individual PR
+        if blob.size < 2000:
+            continue
+        time_created = blob.time_created.replace(tzinfo=None)
+        if time_created > newest_time:
+            newest_time = time_created
+            args.file = f"gs://{BUILD_BUCKET}/{blob.name}"
+
 if args.file.startswith("gs://"):
     path = args.file[5:]
     bucket = path.split('/')[0]