Several small fixes

ubuntu_lint/cli.py

@@ -66,8 +66,8 @@ def set_linter(
                 del self._action_by_name[name]
             except KeyError:
                 pass
-            finally:
-                return
+
+            return
 
         self._checks_by_name[name] = fn
         self._action_by_name[name] = failure_action

ubuntu_lint/context.py

@@ -51,6 +51,7 @@ def __init__(
         if not any((self._changes, self._changelog)):
             raise ValueError("context requires at least one of changes or changelog")
 
+        self._lp: Launchpad | None = None
         if launchpad_handle is not None:
             self._lp = launchpad_handle
 
@@ -95,4 +96,7 @@ def is_stable_release(self) -> bool:
         else:
             raise ValueError("missing required context, require changelog or changes")
 
-        return dist in distro_info.UbuntuDistroInfo().supported()
+        di = distro_info.UbuntuDistroInfo()
+        stable = set(di.supported() + di.supported_esm()) - set([di.devel()])
+
+        return dist in stable

ubuntu_lint/linters.py

@@ -71,11 +71,16 @@ def check_missing_git_ubuntu_references(context: Context):
     if missing:
         context.lint_fail("changes file is missing {}".format(", ".join(missing)))
 
-    r = requests.get(f"{vcs_git}/patch/?h={vcs_git_ref}")
-    if r.ok and r.text.startswith(f"From {vcs_git_commit} "):
-        return
+    url = f"{vcs_git}/patch/?h={vcs_git_ref}"
+    r = requests.get(url)
+    if not r.ok:
+        if r.status_code == 404:
+            context.lint_fail(f"{url} does not exist")
+        else:
+            context.lint_fail(f"failed to check {url} (status_code={r.status_code})")
 
-    context.lint_fail("Vcs-Git fields in changes file do not match the remote")
+    if not r.text.startswith(f"From {vcs_git_commit} "):
+        context.lint_fail("Vcs-Git fields in changes file do not match the remote")
 
 
 def check_missing_pending_changelog_entry(context: Context):