Fix git cloning, updating, refactor code

.gitignore

@@ -60,3 +60,4 @@ target/
 
 venv
 settings.py
+repos

gogsmaker.py

@@ -4,6 +4,7 @@ A webhook-handler for Gogs running `make` when needed. """
 
 import os
 import subprocess
+from functools import wraps
 from flask import Flask, request
 from . import settings
 
@@ -16,6 +17,7 @@ class UnmonitoredRepository(Exception):
 
 class GitError(Exception):
     def __init__(self, what):
+        super().__init__()
         self.what = what
 
     def __str__(self):
@@ -39,12 +41,6 @@ def update_repo(hook, clone_url):
     ''' Update (or clone) the given repository. May raise GitError. '''
     path = repo_path(hook)
     if os.path.isdir(os.path.join(path, '.git')):  # Repo is already cloned
-        try:
-            subprocess.run(['git', 'clone', clone_url, path], check=True)
-        except subprocess.CalledProcessError:
-            raise GitError("Cannot clone {}".format(clone_url))
-
-    else:  # Simply update
         try:
             subprocess.run(['git', '-C', path, 'reset', '--hard'],
                            check=True)  # Just in case.
@@ -52,29 +48,43 @@ def update_repo(hook, clone_url):
         except subprocess.CalledProcessError:
             raise GitError("Cannot pull {}".format(hook['name']))
 
+    else:  # Simply update
+        try:
+            subprocess.run(['mkdir', '-p', path])
+            subprocess.run(['git', 'clone', clone_url, path], check=True)
+        except subprocess.CalledProcessError:
+            raise GitError("Cannot clone {}".format(clone_url))
+
 
 def gogs_payload(required):
     def wrapper(fct):
-        payload = request.json
-        if payload is None:
-            return 'Expected json\n', 415
+        @wraps(fct)
+        def wrapped(*args, **kwargs):
+            # TODO: check signature
+            # payload_raw = request.data
 
-        for field in required + ['repository/html_url']:
-            path = field.split('/')
-            explore = payload
-            for section in path:
-                if section not in explore:
-                    return (
-                        'Invalid json: missing {}\n'.format('/'.join(path)),
-                        400)
-                explore = explore[section]
+            payload = request.json
+            if payload is None:
+                return 'Expected json\n', 415
 
-        try:
-            hook = get_hook(payload['repository']['html_url'])
-        except UnmonitoredRepository:
-            return 'Unmonitored repository\n', 403
+            for field in required + ['repository/html_url']:
+                path = field.split('/')
+                explore = payload
+                for section in path:
+                    if section not in explore:
+                        return (
+                            'Invalid json: missing {}\n'.format(
+                                '/'.join(path)),
+                            400)
+                    explore = explore[section]
 
-        return fct(payload, hook)
+            try:
+                hook = get_hook(payload['repository']['html_url'])
+            except UnmonitoredRepository:
+                return 'Unmonitored repository\n', 403
+
+            return fct(payload, hook, *args, **kwargs)
+        return wrapped
     return wrapper