repl.deploy

Automatically deploy from GitHub to Replit, lightning fast ⚡️

repl.deploy is split into

• A GitHub app, which listens for code changes and sends events to your repl
• A daemon, which runs on your repl, listens for events, fetches changes from GitHub and restarts your application

Table of Contents

• Usage
• How?
• FAQ
• Supporters

Usage

1. Authorize repl.deploy to get events from GitHub

2. Make sure you have a main branch on your origin remote

3. Add replit-deploy.json to your git repository with a single endpoint key, which is the address of your repl + /refresh. E.g.

{
"endpoint": "https://my-amazing-application.my-username.repl.co/refresh" }

4. Clone your git repository to your repl

5. Download repl.deploy to the root of your repl -- Open the shell, and run

curl -sL https://repl-deploy.vercel.app/ -o repl.deploy
chmod +x ./repl.deploy

WARNING: Proceeding will overwrite any local changes and reset from your GitHub repo. Commit AND push any local changes BEFORE running repl.deploy

6. For repls that do not use an HTTP server in their code (See example)

   • Create/modify the .replit file in the root of your repl and change run= to run ./repl.deploy --standalone <command to run your code here>. E.g.

   run="./repl.deploy --standalone node index.js"
   

7. For repls that use an HTTP server in their code (See example)

   • Create/modify the .replit file in the root of your repl and change run= to run ./repl.deploy <command to run your code here>. E.g.

   run="./repl.deploy node index.js"
   

   • Set up the /refresh endpoint, and log a line in the following format to stdout when a request is recieved: repl.deploy<insert json body here (don't include the angle brackets)><insert "Signature" header here (don't include the angle brackets)>. E.g.

   repl.deploy{"timestamp":1615896087141,"endpoint":"https://8c051d0fbc4b.ngrok.io/refresh"}ostjM6/jGmHbRWcHazxKWSPmvgvoIryI9XxLgNKgxPCKRW==
   

   • Your application will recieve JSON via stdin. E.g.

   {"status":"403","body":"Invalid Signature"}
   

   simply respond with the given status and body (see example)

   • Once you've responded, log (to stdout)

   repl.deploy-success
   

8. Click Run once. Make sure your repl is set to always-on or has a pinging service set up (otherwise, the daemon will be stopped by repl once you close your browser tab)

9. That's it! Repl.it should automatically pull changes from GitHub the next time you commit

How?

• When you commit, GitHub sends an event to a hosted instance of the repl.deploy server

• A payload consisting of both the endpoint and the current time is prepared and signed with an RSA private key

• The daemon running on the repl recieves the payload, and

  • Verifies the signature
  • Checks that the endpoint matches (this is to prevent someone from just forwarding a signed request to your repl and causing it to restart)
  • Checks that the timestamp is less than 15 seconds old (this is to prevent someone from abusing a signature in the event that a signed request is leaked by you)

• If the request is valid, the daemon

  • runs git fetch --all and then git reset --hard origin/main
  • restarts your program

FAQ

• Q: What does run="./repl.deploy --standalone node index.js" do?
  A: It makes the Replit Run button run the daemon instead of executing the program directly, which then executes/re-executes the program on git push

• Q: Does repl.deploy need to be downloaded every time the program is run?
  A: No, repl.deploy only needs to be downloaded once per repl

• Q: What's https://repl-deploy.vercel.app/?
  A: A hosted version of get-release-url, which saves you the time of manually finding the latest release and linking it.

Supporters