action.yml

name: Setup SSH client

description: Sets up everything required for connecting to an SSH server from a GitHub Actions runner

inputs:
  ssh-key:
    description: The client's SSH private key
    required: true
  known-hosts:
    description: Keys for the known_hosts file (these are appended to the file)
    required: false

runs:
  using: composite
  steps:
    - name: Make sure SSH directory exists
      shell: bash
      run: |
        mkdir -p ~/.ssh
        chmod 700 ~/.ssh

    - name: Create the SSH key file
      shell: bash
      run: |
        touch ~/.ssh/id_rsa
        echo "${{ inputs.ssh-key }}" > ~/.ssh/id_rsa
        chmod 600 ~/.ssh/id_rsa

    - name: Append to the known_hosts file
      if: inputs.known-hosts
      shell: bash
      run: |
        touch ~/.ssh/known_hosts
        echo "${{ inputs.known-hosts }}" >> ~/.ssh/known_hosts
        chmod 600 ~/.ssh/known_hosts