showing a warning dialog when the application starts and **snapd** is unavailable

fpakman/core/controller.py

@@ -9,8 +9,9 @@ from fpakman.core.system import FpakmanProcess
 
 class ApplicationManager(ABC):
 
-    def __init__(self, app_args):
+    def __init__(self, app_args, locale_keys: dict):
         self.app_args = app_args
+        self.locale_keys = locale_keys
 
     @abstractmethod
     def search(self, word: str, disk_loader: DiskCacheLoader) -> Dict[str, List[Application]]:
@@ -84,6 +85,10 @@ class ApplicationManager(ABC):
     def list_updates(self) -> List[ApplicationUpdate]:
         pass
 
+    @abstractmethod
+    def list_warnings(self) -> List[str]:
+        pass
+
 
 class GenericApplicationManager(ApplicationManager):
 
@@ -266,3 +271,18 @@ class GenericApplicationManager(ApplicationManager):
                     updates.extend(man.list_updates())
 
         return updates
+
+    def list_warnings(self) -> List[str]:
+        if self.managers:
+            warnings = None
+
+            for man in self.managers:
+                man_warnings = man.list_warnings()
+
+                if man_warnings:
+                    if warnings is None:
+                        warnings = []
+
+                    warnings.extend(man_warnings)
+
+            return warnings

fpakman/core/flatpak/controller.py

@@ -17,8 +17,8 @@ from fpakman.util.cache import Cache
 
 class FlatpakManager(ApplicationManager):
 
-    def __init__(self, app_args: Namespace, api_cache: Cache, disk_cache: bool, http_session):
-        super(FlatpakManager, self).__init__(app_args=app_args)
+    def __init__(self, app_args: Namespace, api_cache: Cache, disk_cache: bool, http_session, locale_keys: dict):
+        super(FlatpakManager, self).__init__(app_args=app_args, locale_keys=locale_keys)
         self.api_cache = api_cache
         self.http_session = http_session
         self.disk_cache = disk_cache
@@ -176,5 +176,7 @@ class FlatpakManager(ApplicationManager):
                         updates.append(ApplicationUpdate(app_id='{}:{}'.format(app['id'], app['branch']),
                                                          app_type='flatpak',
                                                          version=app.get('version')))
-
         return updates
+
+    def list_warnings(self) -> List[str]:
+        return None

fpakman/core/snap/controller.py

@@ -17,8 +17,8 @@ from fpakman.util.cache import Cache
 
 class SnapManager(ApplicationManager):
 
-    def __init__(self, app_args: Namespace,  api_cache: Cache, disk_cache: bool, http_session):
-        super(SnapManager, self).__init__(app_args=app_args)
+    def __init__(self, app_args: Namespace,  api_cache: Cache, disk_cache: bool, http_session, locale_keys: dict):
+        super(SnapManager, self).__init__(app_args=app_args, locale_keys=locale_keys)
         self.api_cache = api_cache
         self.http_session = http_session
         self.disk_cache = disk_cache
@@ -133,3 +133,7 @@ class SnapManager(ApplicationManager):
 
     def list_updates(self) -> List[ApplicationUpdate]:
         return []
+
+    def list_warnings(self) -> List[str]:
+        if snap.get_snapd_version() == 'unavailable':
+            return [self.locale_keys['snap.notification.snapd_unavailable']]

fpakman/core/snap/snap.py

@@ -9,7 +9,7 @@ BASE_CMD = 'snap'
 
 def is_installed():
     version = get_snapd_version()
-    return False if version is None else True
+    return False if version is None or version == 'unavailable' else True
 
 
 def get_version():
@@ -27,7 +27,7 @@ def get_snapd_version():
 
         if lines and len(lines) >= 2:
             version = lines[1].split(' ')[-1].strip()
-            return version if version and version.lower() != 'unavailable' else None
+            return version.lower() if version else None
         else:
             return None