Logging: Don't allow getting user info to stop application starting

In certain scenarios (probably due to host contamination) the effective UID of
the running application is not the expected "genenetwork" user, rather, it is
a user on the host system, which leads to the error:

    KeyError: 'getpwuid(): uid not found: 1000'

This commit prevents the application from failing in such a case, but still
logs out such weirdness.

1 files changed, 8 insertions, 3 deletions

diff --git a/gn3/app.py b/gn3/app.py
index ffde223..da87f2b 100644
--- a/gn3/app.py
+++ b/gn3/app.py
@@ -3,6 +3,7 @@ import os
 import sys
 import logging
 import getpass
+import traceback
 
 from typing import Dict
 from typing import Union
@@ -48,9 +49,13 @@ def create_app(config: Union[Dict, str, None] = None) -> Flask:
 
     setup_app_handlers(app)
     # DO NOT log anything before this point
-    logging.info("Guix Profile: '%s'." % (os.environ.get("GUIX_PROFILE"),))
-    logging.info("Python Executable: '%s'." % sys.executable)
-    logging.info("Effective User: '%s'." % getpass.getuser())
+    logging.info("Guix Profile: '%s'.", os.environ.get("GUIX_PROFILE"))
+    logging.info("Python Executable: '%s'.", sys.executable)
+    try:
+        logging.info("Effective User: '%s'.", getpass.getuser())
+    except KeyError as kerr:
+        logging.debug("User Error: %s", kerr.args[0])
+        logging.error(traceback.format_exc())
 
     CORS(
         app,