action.yml

name: docker-context-create
description: Creates a docker context pointing to a remote docker engine using SSH authentication
branding:
  icon: 'anchor'
  color: 'blue'
  
inputs:

  ssh_cert:
    required: false
    description: SSH server public key for remote docker authentification

  ssh_key:
    required: false
    description: SSH client private key for remote docker authentification

  docker_host:
    required: true
    description: URL to the remote docker engine in format ssh://username@hostname.domain.tld

  context_name:
    required: true    
    description: Name of the remote context on the local docker client

  use_context:
    required: false
    default: 'false'
    description: Indicates wether the docker context is set as the curent docker context

runs:
  using: composite
  steps:

    - shell: bash
      name: Create ssh directory
      run: mkdir --parents $HOME/.ssh

    - shell: bash
      name: Start SSH Agent
      run: |
        if [ -z "$SSH_AGENT_PID" ]; then
          eval $(ssh-agent)
          echo "SSH_AUTH_SOCK=$SSH_AUTH_SOCK" >> $GITHUB_ENV
          echo "SSH_AGENT_PID=SSH_AGENT_PID" >> $GITHUB_ENV          
        fi        

    - shell: bash
      name: Configure SSH server public key
      run:  if [ -n "${{ inputs.ssh_cert }}" ]; then echo "${{ inputs.ssh_cert }}" >> "$HOME/.ssh/known_hosts"; fi

    - shell: bash
      name: Configure SSH client private key
      run: if [ -n "${{ inputs.ssh_key }}" ]; then echo "${{ inputs.ssh_key }}" | ssh-add - ; fi

    - shell: bash
      name: Remove the docker remote context
      run: docker context rm -f "${{ inputs.context_name }}"

    - shell: bash
      name: Create the docker remote context
      run: docker context create "${{ inputs.context_name }}" --docker "host=${{ inputs.docker_host }}"

    - shell: bash
      name: Set as current context
      run: if [ "true" == "${{ inputs.use_context}}" ]; then docker context use "${{ inputs.context_name }}"; fi