osbuild/solver: add InvalidRequestError exception

This will allow validating request arguments in the solver method in a
different way for dnf4 and dnf5 and raising an exception if needed.

Signed-off-by: Tomáš Hozza <thozza@redhat.com>

osbuild/solver/__init__.py

@@ -48,6 +48,10 @@ class DepsolveError(SolverException):
     pass
 
 
+class InvalidRequestError(SolverException):
+    pass
+
+
 def modify_rootdir_path(path, root_dir):
     if path and root_dir:
         # if the root_dir is set, we need to translate the key path to be under this directory

tools/osbuild-depsolve-dnf

@@ -13,7 +13,7 @@ import os.path
 import sys
 import tempfile
 
-from osbuild.solver import GPGKeyReadError, MarkingError, DepsolveError, RepoError
+from osbuild.solver import GPGKeyReadError, MarkingError, DepsolveError, RepoError, InvalidRequestError
 
 # Load the solver configuration
 config = {"use_dnf5": False}
@@ -92,6 +92,12 @@ def solve(request, cache_dir):
                 "kind": "DepsolveError",
                 "reason": f"There was a problem depsolving {', '.join(pkgs)}: {e}"
             }
+        except InvalidRequestError as e:
+            printe("error invalid request")
+            return None, {
+                "kind": "InvalidRequest",
+                "reason": str(e)
+            }
         except Exception as e:  # pylint: disable=broad-exception-caught
             printe("error traceback")
             import traceback