Implemented update check endpoint

selfprivacy_api/resources/services/update.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env/python3
+"""Update dispatch module"""
+import json
+import os
+import portalocker
+import subprocess
+from flask_restful import Resource, reqparse
+
+from selfprivacy_api.resources.services import api
+
+
+class PullRepositoryChanges(Resource):
+    def get(self):
+        """
+        Pull Repository Changes
+        ---
+        tags:
+            - Update
+        security:
+            - bearerAuth: []
+        responses:
+            200:
+                description: Got update
+            201:
+                description: Nothing to update
+            401:
+                description: Unauthorized
+            500:
+                description: Something went wrong
+        """
+
+        git_pull_command = ["git", "pull"]
+
+
+        os.chdir("/etc/nixos")
+        git_pull_process_descriptor = subprocess.Popen(
+            git_pull_command,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            shell=False
+        )
+
+
+        git_pull_process_descriptor.communicate()[0]
+
+        if git_pull_process_descriptor.returncode == 0:
+            return {
+                "status": 0,
+                "message": "Update completed successfully"
+            }
+        elif git_pull_process_descriptor.returncode > 0:
+            return {
+                "status": git_pull_process_descriptor.returncode,
+                "message": "Something went wrong"
+            }, 500
+
+api.add_resource(PullRepositoryChanges, "/update")