From e520dccd130e6b7b8ba8460a3b7ddc8c177e9be3 Mon Sep 17 00:00:00 2001
From: Yaakov Selkowitz <yselkowi@redhat.com>
Date: Nov 10 2023 19:59:30 +0000
Subject: Provide error message on depchase failure


This assertion was triggered after F39 final freeze lifted, and one of
the many updates included the splitting out of a -libs subpackage from a
runtime dependency.  At least in that case, the solution is to update
the runtime, but without a message it is difficult to debug.

---

diff --git a/flatpak_module_tools/depchase/cli.py b/flatpak_module_tools/depchase/cli.py
index 2c8e065..557f898 100644
--- a/flatpak_module_tools/depchase/cli.py
+++ b/flatpak_module_tools/depchase/cli.py
@@ -205,7 +205,7 @@ def collate_packages(
     for package in packages.values():
         if not requested_packages or package.name not in requested_packages:
             package.explanation = get_explanation(package.name)
-            assert package.explanation is not None
+            assert package.explanation is not None, f"{package.name} dependency cannot be resolved, may be missing from runtime"
             package.explanation.append(package.name)
 
     return packages