views: Limit update image to images available in assigned repository

Allow to update only images that are in the repo the client is assigned
to; if an image is inside a different repo, it will not appear in the
'Image' selector

ogcp/views.py

@@ -1320,8 +1320,14 @@ def action_image_update():
     form.ip.data = ' '.join(ips)
 
     server = get_server_from_clients(ips)
-    r = server.get('/images')
-    for image in r.json()['images']:
+    r = server.get('/client/info', payload={'client': list(ips)})
+    repo_id = r.json()['repo_id']
+    images = get_images_grouped_by_repos_from_server(server)
+    if repo_id not in images:
+        flash(_('Computer is assigned to a repo with no images'),
+              category='error')
+        return redirect(url_for('commands'))
+    for image in images[repo_id]:
         form.image.choices.append((image['id'], image['name']))
 
     r = server.get('/client/setup', payload={'client': list(ips)})