# virtual/vserver.pp -- manage vserver specifics
# Copyright (C) 2007 David Schmitt <david@schmitt.edv-bus.at>
# See LICENSE for the full license granted to you.

module_dir{ "virtual/contexts": }

class vserver::host {

  # make sure we have the ability to query for lsbdistcodename
  include assert_lsbdistcodename

  $utilvserver_version = $lsbdistcodename ? {
    etch => "0.30.216~r2772-6~bpo40+1",
    lenny => latest,
    default => latest,
  }

  package { 
    "util-vserver":
      ensure => $utilvserver_version;

    debootstrap:
      ensure => installed
  }

  file {
    "/etc/vservers":
      ensure => directory,
      require => Package["util-vserver"];

    "/etc/vservers/local-interfaces":
      ensure => directory,
      mode => 0755, owner => root, group => root,
      require => File["/etc/vservers"];

    "/usr/local/bin/build_vserver":
      source => "puppet://$server/virtual/vserver/build_vserver",
      mode => 0755, owner => root, group => root,
      require => [ Package['util-vserver'], Package[debootstrap]];

    # perhaps we should use hashify.
    # but i'm commenting this out until we learn how to properly use in case we want to use it.
    #"/etc/cron.daily/vserver-hashify":
    #  source => "puppet://$server/virtual/hashify.cron.daily",
    #  mode => 0755, owner => root, group => root;
  }

  # remove dummy interfaces on the host
  delete_lines { modules_dummy:
    file => "/etc/modules",
    pattern => "^dummy",
  }
  
  # Remove these dummy interfaces, they are annoying and we dont need them
  file { 
    "/etc/modprobe.d/local-dummy":
      ensure => absent,
      mode => 0644, owner => root, group => root;
   }

  # Setup some plugins if munin is enabled in the system
  case $munin_cidr_allow {
    '': {}
    default: {
               file {
                 "/usr/local/share/munin-plugins/vserver_resources":
                   source => "puppet://$server/virtual/munin/vserver_resources",
                   mode => 0755, owner => root, group => root;

                 "/usr/local/share/munin-plugins/vserver_cpu_":
                   source => "puppet://$server/virtual/munin/vserver_cpu_",
                   mode => 0755, owner => root, group => root;

                 "/usr/local/share/munin-plugins/vserver_loadavg":
                   source => "puppet://$server/virtual/munin/vserver_loadavg",
                   mode => 0755, owner => root, group => root;
               }
             }
  }
  
  # Setup some plugins if munin is enabled in the system
  case $munin_cidr_allow {
    '': {}
    default: {
               # This creates a load average graph combining the individual load averages of each vserver on the host
               munin::plugin {
                 "vserver_loadavg":
                   config => "user root\n",
                   script_path => "/usr/local/share/munin-plugins";
               }

               # This creates a RSS graph for each vserver on the host (note after more than 4 vservers this can get noisy)
               munin::plugin {
                 "vserver_resources_RSS":
                   ensure => "vserver_resources",
                   config => "user root\nenv.resource RSS",
                   script_path => "/usr/local/share/munin-plugins";
               }

               # This creates a VM graph for each vserver on the host (note after more than 4 vservers this can get noisy)
               munin::plugin {
                 "vserver_resources_VM":
                   ensure => "vserver_resources",
                   config => "user root\nenv.resource VM",
                   script_path => "/usr/local/share/munin-plugins";
               }

               # This creates a VM graph for each vserver on the host (note after more than 4 vservers this can get noisy)
               munin::plugin {
                 "vserver_cpu_":
                   config => "user root\n",
                   script_path => "/usr/local/share/munin-plugins";
               }
             }
  }
}

define vs_create($in_domain, $context, $legacy = false, $distro = 'etch',
                 $debootstrap_mirror = 'http://ftp.debian.org/debian', $hostname = false, $interface = false) { 
  $vs_name      = $legacy    ? { true  => $name, false => $in_domain ? { '' => $name, default => "${name}.${in_domain}" } }
  $vs_hostname  = $hostname  ? { false => 'none', default => $hostname }
  $vs_interface = $interface ? { false => 'none', default => $interface }

  case $vs_name { '': { fail ( "Cannot create VServer with empty name" ) } }

  case $legacy {
    true: {
      exec { "/bin/false # cannot create legacy vserver ${vs_name}":
        creates => "/etc/vservers/${vs_name}",
        alias => "vs_create_${vs_name}"
      }
    }
    false: {
      exec { "/usr/local/bin/build_vserver \"${vs_name}\" ${context} ${distro} ${debootstrap_mirror} ${vs_hostname} ${interface}":
        creates => "/etc/vservers/${vs_name}",
        require => File["/usr/local/bin/build_vserver"],
        alias => "vs_create_${vs_name}"
      }
    }
  }
}

# ensure: present, stopped, running
define vserver($ensure, $context, $in_domain = '', $mark = '', $legacy = false, $distro = 'etch',
               $hostname = false, $interface = false) {
  case $in_domain { '': {} 
    default: { err("${fqdn}: vserver ${name} uses deprecated \$in_domain" ) }
  }

  $vs_name = $legacy ? { true => $name, false => $in_domain ? { '' => $name, default => "${name}.${in_domain}" } }

  case $vs_name { '': { fail ( "Cannot create VServer with empty name" ) } }

  $nodename  = $hostname ? { false => $vs_name, default => $hostname }
  $if_dir    = "/etc/vservers/${vs_name}/interfaces"
  $mark_file = "/etc/vservers/${vs_name}/apps/init/mark"

  # TODO: wasn't there a syntax for using arrays as case selectors??
  case $ensure {
    present: {
               vs_create{ $name:
                 in_domain => $in_domain,
                 context   => $context,
                 legacy    => $legacy,
                 distro    => $distro,
                 hostname  => $hostname,
                 interface => $interface,
               }
             }
    running: {
               vs_create{ $name:
                 in_domain => $in_domain,
                 context   => $context,
                 legacy    => $legacy,
                 distro    => $distro,
                 hostname  => $hostname,
                 interface => $interface,
               }
             }
    stopped: {
               vs_create{ $name:
                 in_domain => $in_domain,
                 context   => $context,
                 legacy    => $legacy,
                 distro    => $distro,
                 hostname  => $hostname,
                 interface => $interface,
               }
             }
    delete: {
               vs_create{ $name:
                 in_domain => $in_domain,
                 context   => $context,
                 legacy    => $legacy,
                 distro    => $distro,
                 hostname  => $hostname,
                 interface => $interface,
               }
             }
    default: {
               err("${fqdn}: vserver(${vs_name}): unknown ensure '${ensure}'")
             }
  }

  file {
    $if_dir:
      ensure  => directory, checksum => mtime,
      require => Exec["vs_create_${vs_name}"];
  }

  config_file {
    "/etc/vservers/${vs_name}/context":
      content => "${context}\n",
      notify => Exec["vs_restart_${vs_name}"],
      require => Exec["vs_create_${vs_name}"];
    # create illegal configuration, when two vservers have the same context
    # number
    "/var/lib/puppet/modules/virtual/contexts/${context}":
      content => "\n";
    "/etc/vservers/${vs_name}/uts/nodename":
      content => "${nodename}\n",
      notify => Exec["vs_restart_${vs_name}"],
      require => Exec["vs_create_${vs_name}"];
    "/etc/vservers/${vs_name}/name":
      content => "${vs_name}\n",
      require => Exec["vs_create_${vs_name}"];
  }

  # ensure a secure chroot barrier
  # we have to do it for each vserver, see
  # http://linux-vserver.org/Secure_chroot_Barrier#Solution:_Secure_Barrier
  exec { "setattr --barrier /etc/vservers/${vs_name}/vdir/../":
    unless => "showattr /etc/vservers/${vs_name}/vdir/../ | grep -- '----Bui- /etc/vservers/${vs_name}/vdir/../$'"
  }

  case $ensure {
    present: {
      # don't start or stop the vserver, just make sure it exists, we just run a dummy status test here
      exec { "test -e \$(readlink -f /etc/vservers/${vs_name}/vdir)":
        require => Exec["vs_create_${vs_name}"],
        alias => "vs_restart_${vs_name}",
      }
    }
    stopped: {
      exec { "vserver ${vs_name} stop":
        onlyif => "test -e \$(readlink -f /etc/vservers/${vs_name}/run || echo /doesntexist )",
        require => Exec["vs_create_${vs_name}"],
        # fake the restart exec in the stopped case, so the dependencies are fulfilled
        alias => "vs_restart_${vs_name}",
      }
      file { $mark_file: ensure => absent, }
    }
    delete: {
      exec { "/usr/bin/yes | vserver ${vs_name} delete":
        alias => "vs_restart_${vs_name}",
      }
    }
    running: {
      exec { "vserver ${vs_name} start":
        unless => "test -e \$(readlink -f /etc/vservers/${vs_name}/run)",
        require => [ Exec["vs_create_${vs_name}"], File["/etc/vservers/${vs_name}/context"] ]
      }
      exec { "vserver ${vs_name} restart":
        refreshonly => true,
        require => Exec["vs_create_${vs_name}"],
        alias => "vs_restart_${vs_name}",
        subscribe => File[$if_dir],
      }

      case $mark {
        '': {
          err("${fqdn}: vserver ${vs_name} set to running, but won't be started on reboot without mark!")
          file { $mark_file: ensure => absent, }
        }
        default: { 
          config_file { "/etc/vservers/${vs_name}/apps/init/mark":
            content => "${mark}\n",
            require => Exec["vs_create_${vs_name}"],
          }
        }
      }
    }
  }
}

# Changing stuff with this define won't do much good, since it relies on
# restarting the vservers to do the work, which won't clean up orphaned
# interfaces
define vs_interface($prefix = 24, $dev = '') {

  file {
    "/etc/vservers/local-interfaces/${name}":
      ensure => directory,
      mode => 0755, owner => root, group => root;
    "/etc/vservers/local-interfaces/${name}/ip":
      content => "${name}\n",
      mode => 0644, owner => root, group => root;
    "/etc/vservers/local-interfaces/${name}/prefix":
      content => "${prefix}\n",
      mode => 0644, owner => root, group => root;
  }

  case $dev {
    '': {
      file { 
        "/etc/vservers/local-interfaces/${name}/nodev":
          ensure => present,
          mode => 0644, owner => root, group => root;
        "/etc/vservers/local-interfaces/${name}/dev":
          ensure => absent;
      }
    }
    default: {
      config_file { "/etc/vservers/local-interfaces/${name}/dev": content => $dev, }
      file { "/etc/vservers/local-interfaces/${name}/nodev": ensure => absent, }
    }
  }
}

define vs_ip($vserver, $ip, $ensure) {
  err("$fqdn is using deprecated vs_ip instead of vs_ip_binding for $name")
  vs_ip_binding { $name: vserver => $vserver, ip => $ip, ensure => $ensure }
}

define vs_ip_binding($vserver, $ip, $ensure) {
  case $ensure {
    connected: {
      file { "/etc/vservers/${vserver}/interfaces/${name}":
        ensure => "/etc/vservers/local-interfaces/${ip}/",
        require => [ File["/etc/vservers/local-interfaces/${ip}"], Exec["vs_create_${vserver}"] ],
        notify => Exec["vs_restart_${vserver}"],
      }
    }
    disconnected: {
      file { "/etc/vservers/${vserver}/interfaces/${name}":
        ensure => absent,
      }
    }
    default: {
      err( "${fqdn}: vs_ip: ${vserver} -> ${ip}: unknown ensure: '${ensure}'" )
    }
  }
}