name: 'Rsync SSH transfer'
description: 'Transfer files to another location'
inputs:
  username:
    description: "Username to be used for login"
    required: true
  ssh-key:
    description: "private SSH key to use for logging int"
    required: false
  host:
    description: "Host to log in at"
    required: true
  port:
    description: "Port to connect to"
    required: true
    default: "22"
  known-hosts:
    description: "Content to add to the known_hosts file, to verify the authenticity of the remote"
    required: false
  source:
    description: "Which files to copy"
    required: true
  target:
    description: "Where on the host to copy the files"
    required: true
  args:
    description: "Command line args to pass to rsync"
    required: true
    default: "--archive --compress --verbose --mkpath"

runs:
  using: "composite"
  steps:
    - name: Install rsync
      run: |
        if ! command -v apt-get &> /dev/null
        then
          echo "Only apt is supported"
          exit 1
        fi

        if command -v rsync &> /dev/null
        then
          echo "rsync is already installed"
        else
          echo "Updating package index"
          apt-get update
          echo "Installing rsync"
          apt-get install -y rsync
        fi
      shell: bash

    - name: Create SSH directory
      run: |
        echo "Creating ~/.ssh"
        mkdir -p ~/.ssh
      shell: bash

    - name: Install SSH config
      run: |
        echo "Installing SSH config"
        cat <<EOF > ~/.ssh/config
        Host targethost
          User ${{ inputs.username }}
          HostName ${{ inputs.host }}
          Port ${{ inputs.port }}
          IdentityFile ~/.ssh/key
          ForwardAgent no
          ForwardX11 no
          PasswordAuthentication no
        EOF
        chmod 600 ~/.ssh/config
      shell: bash

    - name: Install SSH known_hosts
      run: |
        echo "Installing known_hosts"
        echo "${{ inputs.known-hosts }}" > ~/.ssh/known_hosts
        echo "  StrictHostKeyChecking yes" >> ~/.ssh/config
      shell: bash
      if: ${{ inputs.known-hosts != null }}

    - name: Disable SSH host key checking
      run: |
        echo "Disabling host key checking"
        echo "  StrictHostKeyChecking no" >> ~/.ssh/config
      shell: bash
      if: ${{ inputs.known-hosts == null }}

    - name: Install SSH key
      run: |
        echo "Installing SSH key"
        echo "${{ inputs.ssh-key }}" > ~/.ssh/key
        chmod 600 ~/.ssh/key
      shell: bash
      if: ${{ inputs.ssh-key != null }}

    - name: Transfer files
      run: |
        echo "Transferring files"
        rsync ${{ inputs.args }} "${{ inputs.source }}" "targethost:${{ inputs.target }}"
      shell: bash

    - name: Cleanup
      run: |
        echo "Cleaning up"
        rm -f ~/.ssh/{config,key,known_hosts} || true
      shell: bash