chore: improve charm storage

Signed-off-by: Dario Faccin <[email protected]>

Author: dariofaccin

charms/jupyter-ui/metadata.yaml

@@ -88,9 +88,7 @@ charm-user: non-root
 storage:
   config:
     type: filesystem
-    location: /etc/config
     minimum-size: 1M
   logos:
     type: filesystem
-    location: /src/apps/default/static/assets/logos/
     minimum-size: 1M

charms/jupyter-ui/src/charm.py

@@ -70,6 +70,7 @@
 TOLERATIONS_OPTIONS_CONFIG_DEFAULT = f"{TOLERATIONS_OPTIONS_CONFIG}-default"
 DEFAULT_PODDEFAULTS_CONFIG = "default-poddefaults"
 JWA_CONFIG_FILE = "src/templates/spawner_ui_config.yaml.j2"
+JWA_CONFIG_FILE_DST = "spawner_ui_config.yaml"
 
 IMAGE_CONFIGS = [
     JUPYTER_IMAGES_CONFIG,
@@ -121,6 +122,9 @@ def __init__(self, *args):
         )
         self._container_name = "jupyter-ui"
         self._container = self.unit.get_container(self._name)
+        self._config_storage_name = "config"
+        self._logos_storage_name = "logos"
+        self._container_meta = self.meta.containers[self._container_name]
 
         # setup context to be used for updating K8S resources
         self._context = {
@@ -302,10 +306,11 @@ def _upload_logos_files_to_container(self):
         splits it into files as expected by the workload,
         and pushes the files to the container.
         """
+        logos_storage_path = Path(self._container_meta.mounts[self._logos_storage_name].location)
         for file_name, file_content in yaml.safe_load(
             Path("src/logos-configmap.yaml").read_text()
         )["data"].items():
-            logo_file = "/src/apps/default/static/assets/logos/" + file_name
+            logo_file = logos_storage_path / file_name
             self.container.push(
                 logo_file,
                 file_content,
@@ -474,8 +479,9 @@ def _render_jwa_spawner_inputs(
 
     def _upload_jwa_file_to_container(self, file_content):
         """Pushes the JWA spawner config file to the workload container."""
+        config_storage_path = Path(self._container_meta.mounts[self._config_storage_name].location)
         self.container.push(
-            "/etc/config/spawner_ui_config.yaml",
+            config_storage_path / JWA_CONFIG_FILE_DST,
             file_content,
             make_dirs=True,
         )