rehearsal: make the script self-contained re sys.path/cwd (E-021)

build/smoke_hub_resume.py

@@ -23,6 +23,15 @@ import subprocess
 import sys
 import time
 
+# Self-contained regardless of how this file is started. A kernel that fetches and exec()s this source
+# runs from /kaggle/src with sys.path[0] pointing there, so `import ounce100m_credentials` fails even
+# though the module is sitting in the working directory next to it (E-021).
+WORK = "/kaggle/working"
+for _p in (WORK, os.getcwd()):
+    if _p and _p not in sys.path:
+        sys.path.insert(0, _p)
+os.chdir(WORK)
+
 ROOT = "/kaggle/working/mixroot"
 REPO = "Cion-lab/ounce100m-mix-stagetest"
 TWO = "cosmopedia__khanacademy,SimpleStories__default"