action.yml

name: 'Docker context over SSH'
description: 'Create a docker context over SSH authentication'
author: 'Amir Marmul'

inputs:
  ssh-host: 
    description: 'ssh host'
    required: true
  ssh-username: 
    description: 'ssh username'
    required: true
  ssh-private-key:
    description: 'content of ssh private key. ex raw content of ~/.ssh/id_rsa'
    required: true
  ssh-passphrase:
    description: 'passphrase for private key, optional'
    required: false
  ssh-port: 
    description: 'ssh port, default 22'
    required: false
    default: 22
  ssh-socket: 
    description: 'ssh socket, default /tmp/ssh-auth.sock'
    required: false
    default: '/tmp/ssh-auth.sock'
  context-name: 
    description: 'name of docker context. default: remote'
    required: true
    default: 'remote'
  context-use:
    description: 'indicate which this context is set as docker current context. default: false'
    required: false
    default: 'false'

runs:
  using: 'composite'
  steps:
    - shell: bash
      name: Create the required directory 
      run: |
        mkdir -p ~/.ssh
        chmod 700 ~/.ssh

    - shell: bash
      name: Add the private key 
      run: |
        echo "${{ inputs.ssh-private-key }}" > ~/.ssh/id_rsa
        chmod 600 ~/.ssh/id_rsa 

    - shell: bash
      name: Add the host to the known_hosts file
      run: ssh-keyscan -p "${{ inputs.ssh-port }}" "${{ inputs.ssh-host }}" > ~/.ssh/known_hosts

    - shell: bash
      name: Create the docker context
      run: docker context create ${{ inputs.context-name }} --docker "host=ssh://${{ inputs.ssh-username}}@${{ inputs.ssh-host }}:${{ inputs.ssh-port }}"

    - shell: bash
      name: Start the ssh agent and set the environment variables
      run: |
        ssh-agent -a "${{ inputs.ssh-port }}"
        echo "SSH_AUTH_SOCK=${{ inputs.ssh-port}}" >> $GITHUB_ENV
        echo "SSH_AGENT_PID=$SSH_AGENT_PID" >> $GITHUB_ENV

    - shell: bash
      # https://unix.stackexchange.com/a/571756/559668
      name: Run ssh-add with passphrase
      if: ${{ inputs.ssh-passphrase }}
      run: |
        { sleep 1; echo ${{ inputs.ssh-passphrase }}; } | script -q /dev/null -c 'ssh-add'
      
    - shell: bash
      name: Set the context as current context 
      run: if [ "${{ inputs.context-use }}" == "true" ]; then docker context use "${{ inputs.context-name }}"; fi 

branding:
  icon: 'anchor'
  color: 'gray-dark'