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path: root/app/jobs/govuk_guix/build_job.rb
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# GOV.UK Mini Environment Admin
# Copyright © 2018  Christopher Baines <mail@cbaines.net>
#
# This file is part of the GOV.UK Mini Environment Admin.
#
# The GOV.UK Mini Environment Admin is free software: you can
# redistribute it and/or modify it under the terms of the GNU Affero
# General Public License as published by the Free Software Foundation,
# either version 3 of the License, or (at your option) any later
# version.
#
# The GOV.UK Mini Environment Admin is distributed in the hope that it
# will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with the GOV.UK Mini Environment Admin.  If not, see
# <http://www.gnu.org/licenses/>.

class GovukGuix::BuildJob < GovukGuix::Job
  DEFAULT_ARGUMENTS = {
    'rails-environment' => 'production',
    'use-high-ports' => 'false',
    'fallback' => true
  }.freeze

  @retry_interval = 30

  def run(mini_environment_id, options)
    logger.info(self.class) do
      "Building mini environment #{mini_environment_id}"
    end

    mini_environment = MiniEnvironment.find(mini_environment_id)

    remote_host = options[:run_remotely_on_host]

    if remote_host
      ssh_command = ['ssh', remote_host]

      # Copy the revision to the remote host, to ensure it's available
      # there
      run_command(
        'guix',
        'copy',
        "--to=#{remote_host}",
        mini_environment.govuk_guix_revision.store_path
      )
    else
      ssh_command = []
    end

    output = run_command(
      *ssh_command,
      "#{mini_environment.govuk_guix_revision.store_path}/bin/govuk",
      'system',
      'build',
      *hash_to_arguments(
        DEFAULT_ARGUMENTS.merge(options[:arguments])
      ),
      *signon_user_arguments(mini_environment.signon_users),
      *options[:services]
    )

    build_output = output.last.strip
    logger.debug(self.class) { "build_output: #{build_output}" }

    mini_environment.update(
      backend_data: {
        build_output: build_output
      }
    )
  end

  def signon_user_to_sexp(signon_user)
    keys = %w(name email role passphrase)

    sexp_contents = keys.zip(
      signon_user.values_at(*keys)
    ).map do |(key, value)|
      "#:#{key} \"#{value}\""
    end

    "(#{sexp_contents.join(' ')})"
  end

  def signon_user_arguments(signon_users)
    signon_users.map do |signon_user|
      "--signon-user=#{signon_user_to_sexp(signon_user)}"
    end
  end

  def self.jobs(mini_environment_id)
    QueJob
      .where(
        job_class: name
      ).where(
        "args->>0 = '#{mini_environment_id}'"
      ).to_a
  end
end