Add a new 'plain_dict' return type for hook_exec, and use it for app config

src/yunohost/app.py

@@ -1606,31 +1606,12 @@ def app_config_show_panel(app):
         "YNH_APP_INSTANCE_NAME": app,
         "YNH_APP_INSTANCE_NUMBER": str(app_instance_nb),
     }
-    parsed_values = {}
 
-    # I need to parse stdout to communicate between scripts because I can't
+    return_code, parsed_values = hook_exec(config_script,
-    # read the child environment :( (that would simplify things so much)
-    # after hours of research this is apparently quite a standard way, another
-    # option would be to add an explicite pipe or a named pipe for that
-    # a third option would be to write in a temporary file but I don't like
-    # that because that could expose sensitive data
-    def parse_stdout(line):
-        line = line.rstrip()
-        logger.info(line)
-
-        if line.strip().startswith("YNH_CONFIG_") and "=" in line:
-            # XXX error handling?
-            # XXX this might not work for multilines stuff :( (but echo without
-            # formatting should do it no?)
-            key, value = line.strip().split("=", 1)
-            logger.debug("config script declared: %s -> %s", key, value)
-            parsed_values[key] = value
-
-    return_code = hook_exec(config_script,
                                 args=["show"],
                                 env=env,
-                            stdout_callback=parse_stdout,
+                                return_format="plain_dict"
-                            )[0]
+                                )
 
     if return_code != 0:
         raise Exception("script/config show return value code: %s (considered as an error)", return_code)

src/yunohost/hook.py

@@ -298,7 +298,7 @@ def hook_callback(action, hooks=[], args=None, no_trace=False, chdir=None,
 
 def hook_exec(path, args=None, raise_on_error=False, no_trace=False,
               chdir=None, env=None, user="root", stdout_callback=None,
-              stderr_callback=None):
+              stderr_callback=None, return_format="json"):
     """
     Execute hook from a file with arguments
 
@@ -401,19 +401,31 @@ def hook_exec(path, args=None, raise_on_error=False, no_trace=False,
     try:
         with open(stdreturn, 'r') as f:
             raw_content = f.read()
+        returncontent = {}
+
+        if return_format == "json":
             if raw_content != '':
-            returnjson = read_json(stdreturn)
+                try:
-        else:
+                    returncontent = read_json(stdreturn)
-            returnjson = {}
                 except Exception as e:
-        raise YunohostError('hook_json_return_error', path=path, msg=str(e),
+                    raise YunohostError('hook_json_return_error',
+                                        path=path, msg=str(e),
                                         raw_content=raw_content)
+
+        elif return_format == "plain_dict":
+            for line in raw_content.split("\n"):
+                if "=" in line:
+                    key, value = line.strip().split("=", 1)
+                    returncontent[key] = value
+
+        else:
+            raise YunohostError("Excepted value for return_format is either 'json' or 'plain_dict', got '%s'" % return_format)
     finally:
         stdreturndir = os.path.split(stdreturn)[0]
         os.remove(stdreturn)
         os.rmdir(stdreturndir)
 
-    return returncode, returnjson
+    return returncode, returncontent
 
 
 def _extract_filename_parts(filename):