squid/.drone/drone-home.jsonnet

local publicSecrets = [
  'ssh-host',
  'ssh-user',
  'ssh-root-user',
];
local secretSecrets = [
  'ssh-password',
];
local util = {
  // the head of an array
    head(array): array[0],
    // the tail of an array
    tail(array): std.makeArray(
      std.length(array) -1,
      function(x) array[x + 1],
    ),
    // compose an array of functions
    compose(functions):
      local compose(functions) =
        if std.length(functions) == 0
          then
            local ret(object) = object;
            ret
          else
            local ret(object) = compose(
              util.tail(
                functions,
              )
            )(
              util.head(
                functions,
              )(object)
            );
            ret;
      compose(functions),
  fromSecret(secret): {
    from_secret: secret,
  },
  secret(secret): std.asciiLower(
    std.strReplace(
      secret,
      '_',
      '-',
    ),
  ),
  environment(secret): std.asciiUpper(
    std.strReplace(
      secret,
      '-',
      '_',
    ),
  ),
  env(secret): std.asciiLower(
    std.strReplace(
      secret,
      '-',
      '_',
    ),
  ),
  envSet(env): function(step) step {
    environment +: {
      [util.environment(env)]: util.fromSecret(
        util.secret(env)
      ),
    },
    settings +: {
      envs +: [
        util.env(env),
      ],
    },
  },
  printEnv(file, env): function(step) util.compose([
    util.envSet(env),
    function(step) step {
      settings +: {
        script +: [
          'echo "export %(environment)s=\'$${%(environment)s}\'" >> %(file)s # "%(secret)s"' % {
            environment: util.environment(env),
            file: file,
            secret: util.secret(env),
          },
        ],
      },
    },
  ])(step),
};
local images = {
  docker: {
    name: 'docker',
    image: 'docker:dind',
  },
  scp(target): {
    name: 'scp',
    image: 'appleboy/drone-scp',
    settings: {
      host: {
        from_secret: 'ssh-host',
      },
      username: {
        from_secret: 'ssh-user',
      },
      password: {
        from_secret: 'ssh-password',
      },
      port: {
        from_secret: 'ssh-port',
      },
      command_timeout: '2m',
      target: target,
      source: [
        '.',
      ],
    },
  },
  ssh: {
    image: 'appleboy/drone-ssh',    
    settings: {
      host: util.fromSecret("ssh-host"),
      port: util.fromSecret("ssh-port"),
      username: util.fromSecret("ssh-user"),
      password: util.fromSecret("ssh-password"),
      envs: [
        'drone_tag',
        'drone_commit',
        'drone_build_number',
        'drone_repo_name',
        'drone_repo_namespace',
      ],
      script: [],
    },
  },
  wait(delay): {
    image: 'alpine',
    name: 'wait',
    commands: [
      'sleep %s' % delay,
    ],
  }
};
[
  {
    kind: 'pipeline',
    type: 'docker',
    name: 'build',
    clone: {
      disable: false,
      depth: 0,
    },
    services: [
      images.docker {
        privileged: true,
        volumes: [
          {
            name: 'dockersock',
            path: '/var/run',
          },
          {
            name: 'ca',
            path: '/etc/docker/certs.d',
          },
        ],
      },
    ],
    volumes: [
      {
        name: 'dockersock',
        temp: {},
      },
      {
        name: 'ca',
        host: {
          path: '/etc/docker/certs.d',
        },
      },
    ],
    steps:[
      images.scp(
        '/stack/squid'
      ),
      images.wait(15),
      util.compose(
        std.map(
          function(secret) util.printEnv('afile', secret),
          publicSecrets,
        )
      )(
        images.ssh {
          name: 'will print ssh-host again',
          settings +: {
            script +: [
            'rm afile'
            ],
          },
        },
      ),
        util.compose(
          std.map(
            function(s) util.envSet(s),
            publicSecrets + secretSecrets
          ) + 
          std.map(
            function(s) function(step) step {
              settings +: {
                script +: [
                  
                  'export %(env)s="$${%(env)s}"' % {
                    env: util.environment(s),
                  },
                  'echo "$${%s}"' % util.environment(s),
                ],
              },
            },
            publicSecrets + secretSecrets
          )
        )
      (
        images.ssh  {
          name: 'deploy squid',
          settings +: {
            //username: util.fromSecret("ssh-root-user"),
            //password: util.fromSecret("ssh-root-password"),
            script +: [
              'set -e',
              "docker network prune -f",
              "cd /stack/squid",
              "docker stack rm squid",
              "sleep 30",
              "docker stack deploy -c docker-compose.yml squid",
            ]
          }
        }
      ),
    ],
  }
]