Detect and warn early about unavailable full domain requirement...

locales/en.json

@@ -19,6 +19,7 @@
     "app_change_url_no_script": "This application '{app_name:s}' doesn't support URL modification yet. Maybe you should upgrade it.",
     "app_change_url_success": "{app:s} URL is now {domain:s}{path:s}",
     "app_extraction_failed": "Could not extract the installation files",
+    "app_full_domain_unavailable": "Sorry, this application requires a full domain to be installed on, but some other apps are already installed on {domain}. One possible solution is to add a subdomain dedicated to this application.",
     "app_id_invalid": "Invalid app ID",
     "app_incompatible": "The app {app} is incompatible with your YunoHost version",
     "app_install_files_invalid": "These files cannot be installed",

src/yunohost/app.py

@@ -847,6 +847,9 @@ def app_install(operation_logger, app, label=None, args=None, no_remove_on_failu
     args_list = [ value[0] for value in args_odict.values() ]
     args_list.append(app_instance_name)
 
+    # Validate domain / path availability for webapps
+    _validate_and_normalize_webpath(manifest, args_odict, extracted_app_folder)
+
     # Prepare env. var. to pass to script
     env_dict = _make_environment_dict(args_odict)
     env_dict["YNH_APP_ID"] = app_id
@@ -2547,8 +2550,7 @@ def _parse_args_for_action(action, args={}):
 def _parse_args_in_yunohost_format(args, action_args):
     """Parse arguments store in either manifest.json or actions.json
     """
-    from yunohost.domain import (domain_list, _get_maindomain,
+    from yunohost.domain import domain_list, _get_maindomain
-                                 _get_conflicting_apps, _normalize_domain_path)
     from yunohost.user import user_info, user_list
 
     args_dict = OrderedDict()
@@ -2666,7 +2668,12 @@ def _parse_args_in_yunohost_format(args, action_args):
             assert_password_is_strong_enough('user', arg_value)
         args_dict[arg_name] = (arg_value, arg_type)
 
-    # END loop over action_args...
+    return args_dict
+
+
+def _validate_and_normalize_webpath(manifest, args_dict, app_folder):
+
+    from yunohost.domain import _get_conflicting_apps, _normalize_domain_path
 
     # If there's only one "domain" and "path", validate that domain/path
     # is an available url and normalize the path.
@@ -2698,7 +2705,25 @@ def _parse_args_in_yunohost_format(args, action_args):
         # standard path format to deal with no matter what the user inputted)
         args_dict[path_args[0][0]] = (path, "path")
 
-    return args_dict
+    # This is likely to be a full-domain app...
+    elif len(domain_args) == 1 and len(path_args) == 0:
+
+        # Confirm that this is a full-domain app This should cover most cases
+        # ...  though anyway the proper solution is to implement some mechanism
+        # in the manifest for app to declare that they require a full domain
+        # (among other thing) so that we can dynamically check/display this
+        # requirement on the webadmin form and not miserably fail at submit time
+
+        # Full-domain apps typically declare something like path_url="/" or path=/
+        # and use ynh_webpath_register or yunohost_app_checkurl inside the install script
+        install_script_content = open(os.path.join(app_folder, 'scripts/install')).read()
+        if re.search(r"\npath(_url)?=[\"']?/[\"']?\n", install_script_content) \
+           and re.search(r"(ynh_webpath_register|yunohost app checkurl)"):
+
+            domain = domain_args[0][1]
+            conflicts = _get_conflicting_apps(domain, "/")
+
+            raise YunohostError('app_full_domain_unavailable', domain)
 
 
 def _make_environment_dict(args_dict, prefix="APP_ARG_"):