Add messages to assertions in asp.py (#32237)

Assertions without messages if/when hit create a blank error message for users.  

This PR adds error messages to all assertions in asp.py even
if it seems unlikely they will ever be needed.

lib/spack/spack/solver/asp.py

@@ -307,7 +307,10 @@ def check_same_flags(flag_dict_1, flag_dict_2):
     for t in types:
         values1 = set(flag_dict_1.get(t, []))
         values2 = set(flag_dict_2.get(t, []))
-        assert values1 == values2
+        error_msg = "Internal Error: A mismatch in flags has occurred:"
+        error_msg += "\n\tvalues1: {v1}\n\tvalues2: {v2}".format(v1=values1, v2=values2)
+        error_msg += "\n Please report this as an issue to the spack maintainers"
+        assert values1 == values2, error_msg
 
 
 def check_packages_exist(specs):
@@ -363,7 +366,11 @@ def format_core(self, core):
 
         Modeled after traceback.format_stack.
         """
-        assert self.control
+        error_msg = (
+            "Internal Error: ASP Result.control not populated. Please report to the spack"
+            " maintainers"
+        )
+        assert self.control, error_msg
 
         symbols = dict((a.literal, a.symbol) for a in self.control.symbolic_atoms)
 
@@ -382,7 +389,11 @@ def minimize_core(self, core):
         ensure unsatisfiability. This algorithm reduces the core to only those
         essential facts.
         """
-        assert self.control
+        error_msg = (
+            "Internal Error: ASP Result.control not populated. Please report to the spack"
+            " maintainers"
+        )
+        assert self.control, error_msg
 
         min_core = core[:]
         for fact in core:
@@ -821,7 +832,8 @@ def key_fn(version):
     def spec_versions(self, spec):
         """Return list of clauses expressing spec's version constraints."""
         spec = specify(spec)
-        assert spec.name
+        msg = "Internal Error: spec with no name occured. Please report to the spack maintainers."
+        assert spec.name, msg
 
         if spec.concrete:
             return [fn.version(spec.name, spec.version)]
@@ -1137,7 +1149,11 @@ def virtual_preferences(self, pkg_name, func):
 
     def provider_defaults(self):
         self.gen.h2("Default virtual providers")
-        assert self.possible_virtuals is not None
+        msg = (
+            "Internal Error: possible_virtuals is not populated. Please report to the spack"
+            " maintainers"
+        )
+        assert self.possible_virtuals is not None, msg
         self.virtual_preferences(
             "all",
             lambda v, p, i: self.gen.fact(fn.default_provider_preference(v, p, i)),
@@ -1656,7 +1672,11 @@ def target_defaults(self, specs):
 
     def virtual_providers(self):
         self.gen.h2("Virtual providers")
-        assert self.possible_virtuals is not None
+        msg = (
+            "Internal Error: possible_virtuals is not populated. Please report to the spack"
+            " maintainers"
+        )
+        assert self.possible_virtuals is not None, msg
 
         # what provides what
         for vspec in sorted(self.possible_virtuals):
@@ -2066,7 +2086,7 @@ def depends_on(self, pkg, dep, type):
         dependencies = self._specs[pkg].edges_to_dependencies(name=dep)
 
         # TODO: assertion to be removed when cross-compilation is handled correctly
-        msg = "Current solver does not handle multiple dependency edges " "of the same name"
+        msg = "Current solver does not handle multiple dependency edges of the same name"
         assert len(dependencies) < 2, msg
 
         if not dependencies:
@@ -2156,7 +2176,11 @@ def build_specs(self, function_tuples):
                 tty.debug(msg)
                 continue
 
-            assert action and callable(action)
+            msg = (
+                "Internal Error: Uncallable action found in asp.py.  Please report to the spack"
+                " maintainers."
+            )
+            assert action and callable(action), msg
 
             # ignore predicates on virtual packages, as they're used for
             # solving but don't construct anything. Do not ignore error
@@ -2226,7 +2250,14 @@ def _develop_specs_from_env(spec, env):
     path = os.path.normpath(os.path.join(env.path, dev_info["path"]))
 
     if "dev_path" in spec.variants:
-        assert spec.variants["dev_path"].value == path
+        error_msg = (
+            "Internal Error: The dev_path for spec {name} is not connected to a valid environment"
+            "path. Please note that develop specs can only be used inside an environment"
+            "These paths should be the same:\n\tdev_path:{dev_path}\n\tenv_based_path:{env_path}"
+        )
+        error_msg.format(name=spec.name, dev_path=spec.variants["dev_path"], env_path=path)
+
+        assert spec.variants["dev_path"].value == path, error_msg
     else:
         spec.variants.setdefault("dev_path", spack.variant.SingleValuedVariant("dev_path", path))
     spec.constrain(dev_info["spec"])