action.yaml

name: SSH tunnel over ngrok
description: Establishes an ngrok tunnel to the GitHub Action runner for debugging

branding:
  icon: minimize-2
  color: purple

inputs:
  timeout:
    description: Tunnel timeout
    required: true
    default: 1h
  port:
    description: Local port to forward to
    required: true
    default: 22
  ssh_public_key:
    description: Your SSH public key
    required: true
  ngrok_token:
    description: Your ngrok auth token
    required: true

runs:
  using: composite
  steps:
    - name: Download ngrok
      run: curl -sO https://bin.equinox.io/c/bNyj1mQVY4c/ngrok-v3-stable-linux-amd64.tgz
      shell: bash
    - name: Untar ngrok
      run: tar xfz ngrok-v3-stable-linux-amd64.tgz
      shell: bash
    - name: Add ~/.ssh directory
      run: mkdir -p ~/.ssh
      shell: bash
    - name: Add SSH public key to authorized_keys
      run: echo "${{ inputs.ssh_public_key }}" >> ~/.ssh/authorized_keys
      shell: bash
    - name: Fix home directory permissions
      run: chmod 755 ~
      shell: bash
    - run: chmod 600 ~/.ssh/authorized_keys
      shell: bash
    - name: Set ngrok auth token
      run: ./ngrok authtoken ${{ inputs.ngrok_token }}
      shell: bash
    - name: Debug message
      run: echo "Starting ngrok tunnel..."
      shell: bash
    - name: Setup ngrok tunnel
      run: timeout ${{ inputs.timeout }} ./ngrok tcp ${{ inputs.port }} &
      shell: bash
    - name: Debug message
      run: echo "Tunnel started."
      shell: bash