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# -*- mode: ruby -*-
# vi: set ft=ruby :

GIT_NAME = 'Egor Tensin'
GIT_EMAIL = 'Egor.Tensin@gmail.com'
GPG_KEY = '3B3EF1235420917E0DB0723991D679FB92B036CB'
UID = Process.euid

Vagrant.configure("2") do |config|
  config.vm.box = "generic/ubuntu2004"

  # Weirdly enough, VirtualBox's shared folders didn't quite work for me.
  # gbp buildpackage would just exit with FileExistsError, which doesn't
  # happen with NFS shares.
  config.vm.synced_folder "../", "/vagrant", type: "nfs"

  config.vm.provider "libvirt" do |v|
    v.cpus = 2
    v.memory = 4096
  end

  # Working with the git repository:
  config.vm.provision "shell", privileged: false, inline: <<-SHELL
    git config --global user.name '#{GIT_NAME}'
    git config --global user.email '#{GIT_EMAIL}'
  SHELL
  config.ssh.forward_agent = true

  # gpg-agent forwarding (https://wiki.gnupg.org/AgentForwarding):
  config.vm.provision "shell", privileged: false, inline: <<-SHELL
    gpg --keyserver hkp://keyserver.ubuntu.com/ --recv-keys '0x#{GPG_KEY}'
    gpg --import-ownertrust <<'EOF'
#{GPG_KEY}:6:
EOF
  SHELL
  config.vm.provision "shell", inline: <<-SHELL
    echo 'StreamLocalBindUnlink yes' >> /etc/ssh/sshd_config
  SHELL
  # "agent-extra-socket" on the host.
  local_gpg_socket = one_line(run('gpgconf', '--list-dirs', 'agent-extra-socket'))
  # "agent-socket" on the VM.
  remote_gpg_socket = "/run/user/#{UID}/gnupg/S.gpg-agent"
  config.ssh.extra_args = ['-R', "#{remote_gpg_socket}:#{local_gpg_socket}"]

  # Install the required packages:
  config.vm.provision "shell", inline: <<-SHELL
    apt-get update
    apt-get install -y build-essential devscripts dh-make git-buildpackage
  SHELL

  config.vm.provision :reload
end

require "open3"

def run(*cmd)
  stdout, stderr, status = Open3.capture3(*cmd)
  abort stderr unless status.success?
  stdout
end

def one_line(output)
  lines = output.lines.map(&:chomp)
  abort "Must be a single line: #{lines}" unless lines.length == 1
  lines.first
end