App.is_excluded_from_build():

App.is_excluded_from_build() uses the wrong function entirely to query the [build.exclude] section of project.conf (App.get_project_refs() instead of App.get_value()). This has obviously never worked. It rose to prominence because commit 6db73873 introduced App.__proj_dir(), which now raises an Exception if passed garbage, which in turn surfaces as
Exception: No project path found for module "debian"
Use the correct function for that: App.get_value().
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/App.py

@@ -652,19 +652,14 @@ class App(Base):
 
     def is_excluded_from_build(self, project: str) -> str | None:
         log(DEBUG, 'checking if project ' + project + ' is excluded from build')
-        exclude = self.get_project_refs(
-            [project],
-            ['build'],
-            'exclude',
-            scope = Scope.One,
-            add_self = False,
-            names_only = True,
-        )
+        exclude = self.get_value(project, 'build', 'exclude')
+        if exclude is None:
+            return None
+        exclude_arr = re.split(r'[, ]+', exclude)
         cascade = self.distro.os_cascade + ['all']
-        for p1 in exclude:
-            for p2 in cascade:
-                if p1 == p2:
-                    return p1
+        intersection = [x for x in cascade if x in set(exclude_arr)]
+        if intersection:
+            return ', '.join(intersection)
         return None
 
     def find_circular_deps(self, projects: list[str], flavours: list[str]) -> bool: