Merge pull request #2741 from cta-observatory/username_fallback

Catch any exception in _get_username

Author: maxnoe

.github/workflows/ci.yml

@@ -103,6 +103,12 @@ jobs:
           path: ~/.cache/ctapipe
           key: ctapipe-test-data-desy
 
+      - name: cache astropy data
+        uses: actions/cache@v4
+        with:
+          path: ~/.astropy/cache
+          key: astropy-cache
+
       - name: Prepare mamba installation
         if: matrix.install-method == 'mamba' &&  contains(github.event.pull_request.labels.*.name, 'documentation-only') == false
         env:

docs/changes/2741.bugfix.rst

@@ -0,0 +1,2 @@
+Fallback to "Unknown User" in case no username is available
+from the system for provenance.

src/ctapipe/io/metadata.py

@@ -73,9 +73,10 @@ def _get_user_name():
         import pwd
 
         return pwd.getpwuid(os.getuid()).pw_gecos
-    except ImportError:
-        # the pwd module is not available on some non-unix systems (Windows), so
-        # here we just fall back to a default name
+    except Exception:
+        # the pwd module is not available on some non-unix systems (Windows)
+        # also, a username might not exist (e.g. in docker containers run with a custom uid)
+        # so here we just fall back to a default name
         return "Unknown User"