parse "excluded by strict priority" errors as conflicts (#343)

conda_libmamba_solver/solver.py

@@ -640,6 +640,9 @@ def _parse_problems(cls, problems: str) -> Mapping[str, MatchSpec]:
                 pin_b = words[5].rsplit("-", 1)[0]
                 conflicts.append(MatchSpec(pin_a))
                 conflicts.append(MatchSpec(pin_b))
+            elif "is excluded by strict repo priority" in line:
+                # package python-3.7.6-h0371630_2 is excluded by strict repo priority
+                conflicts.append(cls._str_to_matchspec(words[2]))
             else:
                 log.debug("! Problem line not recognized: %s", line)
 
@@ -712,6 +715,10 @@ def _prepare_problems_message(self, pins=None):
             # This error makes 'explain_problems()' crash. Anticipate.
             log.info("Failed to explain problems. Unsupported request.")
             return legacy_errors
+        if "is excluded by strict repo priority" in legacy_errors:
+            # This will cause a lot of warnings until implemented in detail explanations
+            log.info("Skipping error explanation. Excluded by strict repo priority.")
+            return legacy_errors
         try:
             explained_errors = self.solver.explain_problems()
         except Exception as exc:

news/343-excluded-strict-priority

@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Interpret "excluded by strict priority" solver errors as proper satisfiability conflicts and avoid printing related yet uninformative warnings. (#343)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>