From 1b68b91b7487f63ba7bf9f0588033a7c73300269 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Thu, 14 Oct 2021 21:16:38 +0200
Subject: remote reducer readme

---
 contrib/remote-reducer/README.md         | 8 ++++++++
 contrib/remote-reducer/remote_reducer.py | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/contrib/remote-reducer/README.md b/contrib/remote-reducer/README.md
index ccf1adb..74adc66 100644
--- a/contrib/remote-reducer/README.md
+++ b/contrib/remote-reducer/README.md
@@ -3,6 +3,14 @@
 The remote reducer is a simple HTTP service that proxies requests to
 ``anastasis-reducer``.  It is not meant to be used in production.
 
+## Dependencies
+
+The remote reducer needs python3 and flask.  Flask can be installed via pip:
+
+```
+pip3 install flask
+```
+
 ## Running the remote reducer
 
 ```
diff --git a/contrib/remote-reducer/remote_reducer.py b/contrib/remote-reducer/remote_reducer.py
index e21047b..aef6d6d 100644
--- a/contrib/remote-reducer/remote_reducer.py
+++ b/contrib/remote-reducer/remote_reducer.py
@@ -2,6 +2,12 @@ import flask
 from flask import Flask, request
 import subprocess
 import json
+import sys
+import os
+
+if sys.version_info.major < 3:
+    print("Python>=3 required")
+    os.exit(1)
 
 app = Flask(__name__)
 
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