require "vagrant"

require Vagrant.source_root.join("plugins/hosts/linux/host")

module VagrantPlugins
  module HostArch
    class Host < VagrantPlugins::HostLinux::Host
      def self.match?
        File.exist?("/etc/arch-release")
      end

      def self.nfs?
        # HostLinux checks for nfsd which returns false unless the
        # services are actively started. This leads to a misleading
        # error message. Checking for nfs (no d) seems to work
        # regardless. Also fixes useless use of cat, regex, and
        # redirection.
        Kernel.system("grep -Fq nfs /proc/filesystems")
      end

      # Normal, mid-range precedence.
      def self.precedence
        5
      end

      def nfs_export(id, ip, folders)
        output = TemplateRenderer.render('nfs/exports_linux',
                                         :uuid => id,
                                         :ip => ip,
                                         :folders => folders)

        @ui.info I18n.t("vagrant.hosts.arch.nfs_export.prepare")
        sleep 0.5

        nfs_cleanup(id)

        output.split("\n").each do |line|
          # This should only ask for administrative permission once, even
          # though its executed in multiple subshells.
          system(%Q[sudo su root -c "echo '#{line}' >> /etc/exports"])
        end

        if systemd?
          # Call start to be nice. This will be a no-op if things are
          # already running. Then use exportfs to pick up the changes we
          # just made.
          system("sudo systemctl start nfsd.service rpc-idmapd.service rpc-mountd.service rpcbind.service")
          system("sudo exportfs -r")
        else
          # The restarting of services when we might not need to can be
          # considered evil, but this will be obviated by systemd soon
          # enough anyway.
          system("sudo /etc/rc.d/rpcbind restart")
          system("sudo /etc/rc.d/nfs-common restart")
          system("sudo /etc/rc.d/nfs-server restart")
        end
      end

      protected

      # This tests to see if systemd is used on the system. This is used
      # in newer versions of Arch, and requires a change in behavior.
      def systemd?
        `ps -o comm= 1`.chomp == 'systemd'
      end
    end
  end
end