Class: OsCtld::Group

Inherits:
Object
  • Object
show all
Includes:
Assets::Definition, Lockable, Manipulable
Defined in:
lib/osctld/group.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Assets::Definition

#define_assets

Methods included from Manipulable

#acquire_manipulation_lock, #init_manipulable, #is_being_manipulated?, #manipulate, #manipulated_by, #release_manipulation_lock

Methods included from Lockable

#exclusively, included, #inclusively, #init_lock, #lock, #unlock

Constructor Details

#initialize(pool, name, load: true, config: nil, devices: true, root: false) ⇒ Group

Returns a new instance of Group.



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# File 'lib/osctld/group.rb', line 14

def initialize(pool, name, load: true, config: nil, devices: true, root: false)
  init_lock
  init_manipulable
  @pool = pool
  @name = name
  @root = root
  @cgparams = nil
  @devices = nil
  @attrs = Attributes.new
  load_config(config) if load
  devices.init if load && devices
end

Instance Attribute Details

#attrs ⇒ Object (readonly)

Returns the value of attribute attrs.



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# File 'lib/osctld/group.rb', line 12

def attrs
  @attrs
end

#cgparams ⇒ Object (readonly)

Returns the value of attribute cgparams.



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# File 'lib/osctld/group.rb', line 12

def cgparams
  @cgparams
end

#devices ⇒ Object (readonly)

Returns the value of attribute devices.



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# File 'lib/osctld/group.rb', line 12

def devices
  @devices
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/osctld/group.rb', line 12

def name
  @name
end

#pool ⇒ Object (readonly)

Returns the value of attribute pool.



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# File 'lib/osctld/group.rb', line 12

def pool
  @pool
end

Instance Method Details

#abs_cgroup_path(subsystem) ⇒ Object 



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# File 'lib/osctld/group.rb', line 131

def abs_cgroup_path(subsystem)
  CGroup.abs_cgroup_path(subsystem, cgroup_path)
end

#abs_full_cgroup_path(subsystem, user) ⇒ Object 



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# File 'lib/osctld/group.rb', line 135

def abs_full_cgroup_path(subsystem, user)
  CGroup.abs_cgroup_path(subsystem, full_cgroup_path(user))
end

#any_container_running? ⇒ Boolean

Return ‘true` if any container from this or any descendant group is running.

Returns:

  • (Boolean) 


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# File 'lib/osctld/group.rb', line 240

def any_container_running?
  groups = [self] + descendants

  DB::Containers.get.each do |ct|
    return true if ct.pool == pool && groups.include?(self) && ct.running?
  end

  false
end

#assets ⇒ Object 



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# File 'lib/osctld/group.rb', line 51

def assets
  define_assets do |add|
    add.file(
      config_path,
      desc: "osctld's group config",
      user: 0,
      group: 0,
      mode: 0o400
    )

    users.each do |u|
      add.directory(
        userdir(u),
        desc: "LXC path for #{u.name}:#{name}",
        user: 0,
        group: u.ugid,
        mode: 0o751
      )
    end

    devices.assets(add)
  end
end

#cgroup_path ⇒ Object 



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# File 'lib/osctld/group.rb', line 115

def cgroup_path
  if root?
    path

  else
    File.join(
      DB::Groups.root(pool).path,
      *name.split('/').drop(1).map { |v| "group.#{v}" }
    )
  end
end

#children ⇒ Array<Group>

Return all groups that are direct descendants

Returns:



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# File 'lib/osctld/group.rb', line 188

def children
  DB::Groups.get.select do |grp|
    next if grp.pool != pool || grp.name == name

    s = if root?
          '/'
        else
          "#{name}/"
        end

    grp.name.start_with?(s) && grp.name[s.size..].index('/').nil?
  end.sort! { |a, b| a.name <=> b.name }
end

#config_dir ⇒ Object 



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# File 'lib/osctld/group.rb', line 107

def config_dir
  File.join(pool.conf_path, 'group', id)
end

#config_path ⇒ Object 



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# File 'lib/osctld/group.rb', line 111

def config_path
  File.join(pool.conf_path, 'group', id, 'config.yml')
end

#configure(path: nil, devices: true) ⇒ Object 



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# File 'lib/osctld/group.rb', line 43

def configure(path: nil, devices: true)
  @path = path if root?
  @cgparams = CGroup::Params.new(self)
  @devices = Devices::Manager.new_for(self)
  @devices.init if devices
  save_config
end

#containers ⇒ Object 



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# File 'lib/osctld/group.rb', line 226

def containers
  ret = []

  DB::Containers.get.each do |ct|
    next if ct.pool != pool || ct.group != self || ret.include?(ct)

    ret << ct
  end

  ret
end

#descendants ⇒ Array<Group>

Return all groups below the current group’s path

Returns:



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# File 'lib/osctld/group.rb', line 204

def descendants
  groups = DB::Groups.get.select { |grp| grp.pool == pool }

  if root?
    groups.drop(1) # remove the root group, which is first

  else
    groups.select { |grp| grp.name.start_with?("#{name}/") }
  end.sort! { |a, b| a.name <=> b.name }
end

#export ⇒ Object 



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# File 'lib/osctld/group.rb', line 316

def export
  inclusively do
    {
      pool: pool.name,
      name:,
      path:,
      full_path: cgroup_path,
      cpu_limit: find_cpu_limit(parents: false),
      memory_limit: find_memory_limit(parents: false),
      swap_limit: find_swap_limit(parents: false)
    }
  end
end

#find_cpu_limit(parents: true) ⇒ Integer?

Returns CPU limit in percent (100 % for one CPU).

Returns:

  • (Integer, nil) —

    CPU limit in percent (100 % for one CPU)



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# File 'lib/osctld/group.rb', line 299

def find_cpu_limit(parents: true)
  limit = cgparams.find_cpu_limit

  if limit
    return limit
  elsif !parents
    return
  end

  self.parents.each do |grp|
    grp_limit = grp.find_cpu_limit(parents: true)
    return grp_limit if grp_limit
  end

  nil
end

#find_memory_limit(parents: true) ⇒ Integer?

Returns memory limit in bytes.

Returns:

  • (Integer, nil) —

    memory limit in bytes



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# File 'lib/osctld/group.rb', line 263

def find_memory_limit(parents: true)
  limit = cgparams.find_memory_limit

  if limit
    return limit
  elsif !parents
    return
  end

  self.parents.each do |grp|
    grp_limit = grp.find_memory_limit(parents: true)
    return grp_limit if grp_limit
  end

  nil
end

#find_swap_limit(parents: true) ⇒ Integer?

Returns swap limit in bytes.

Returns:

  • (Integer, nil) —

    swap limit in bytes



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# File 'lib/osctld/group.rb', line 281

def find_swap_limit(parents: true)
  limit = cgparams.find_swap_limit

  if limit
    return limit
  elsif !parents
    return
  end

  self.parents.each do |grp|
    grp_limit = grp.find_swap_limit(parents: true)
    return grp_limit if grp_limit
  end

  nil
end

#full_cgroup_path(user) ⇒ Object 



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# File 'lib/osctld/group.rb', line 127

def full_cgroup_path(user)
  File.join(cgroup_path, "user.#{user.name}")
end

#groups_in_path ⇒ Array<Group>

Return all groups leading to this group’s path, i.e. all parents and the group itself.

Returns:



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# File 'lib/osctld/group.rb', line 182

def groups_in_path
  parents + [self]
end

#has_containers?(user = nil) ⇒ Boolean

Parameters:

  • user (User, nil) (defaults to: nil)

Returns:

  • (Boolean) 


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# File 'lib/osctld/group.rb', line 216

def has_containers?(user = nil)
  any_ct = DB::Containers.get.detect do |ct|
    ct.pool.name == pool.name \
      && ct.group.name == name \
      && (user.nil? || ct.user.name == user.name)
  end

  any_ct ? true : false
end

#id ⇒ Object 



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# File 'lib/osctld/group.rb', line 27

def id
  @name
end

#ident ⇒ Object 



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# File 'lib/osctld/group.rb', line 31

def ident
  inclusively { "#{pool.name}:#{id}" }
end

#load_config(config = nil) ⇒ Object (protected) 



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# File 'lib/osctld/group.rb', line 358

def load_config(config = nil)
  cfg = if config
          OsCtl::Lib::ConfigFile.load_yaml(config)
        else
          OsCtl::Lib::ConfigFile.load_yaml_file(config_path)
        end

  @path = cfg['path'] if root?
  @cgparams = CGroup::Params.load(self, cfg['cgparams'])
  @devices = Devices::Manager.load(self, cfg['devices'] || [])
  @attrs = Attributes.load(cfg['attrs'] || {})
end

#log_type ⇒ Object 



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# File 'lib/osctld/group.rb', line 330

def log_type
  "group=#{pool.name}:#{name}"
end

#manipulation_resource ⇒ Object 



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# File 'lib/osctld/group.rb', line 334

def manipulation_resource
  ['group', "#{pool.name}:#{name}"]
end

#parent ⇒ Group?

Return the closest parent group

Returns:



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# File 'lib/osctld/group.rb', line 173

def parent
  return if root?

  parents.last
end

#parents ⇒ Array<Group>

Return all parent groups, from the root group to the closest parent

Returns:



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# File 'lib/osctld/group.rb', line 153

def parents
  return [] if root?

  ret = []
  t = ''

  name.split('/')[0..-2].each do |n|
    t = File.join('/', t, n)

    g = DB::Groups.by_path(pool, t)
    raise GroupNotFound, "group '#{t}' not found" if g.nil?

    ret << g
  end

  ret
end

#path ⇒ Object 



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# File 'lib/osctld/group.rb', line 39

def path
  root? ? @path : File.join(DB::Groups.root(pool).path, name)
end

#root? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/group.rb', line 35

def root?
  @root
end

#save_config ⇒ Object 



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# File 'lib/osctld/group.rb', line 338

def save_config
  FileUtils.mkdir_p(config_dir)

  cfg = {
    'cgparams' => cgparams.dump,
    'devices' => devices.dump,
    'attrs' => attrs.dump
  }

  cfg['path'] = path if root?

  File.open(config_path, 'w', 0o400) do |f|
    f.write(OsCtl::Lib::ConfigFile.dump_yaml(cfg))
  end

  File.chown(0, 0, config_path)
end

#set(opts) ⇒ Object

Parameters:

  • opts (Hash)

Options Hash (opts):

  • :attrs (Hash) 


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# File 'lib/osctld/group.rb', line 77

def set(opts)
  opts.each do |k, v|
    case k
    when :attrs
      attrs.update(v)

    else
      raise "unsupported option '#{k}'"
    end
  end

  save_config
end

#setup_for?(user) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/osctld/group.rb', line 147

def setup_for?(user)
  Dir.exist?(userdir(user))
end

#unset(opts) ⇒ Object

Parameters:

  • opts (Hash)

Options Hash (opts):

  • :attrs (Array<String>) 


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# File 'lib/osctld/group.rb', line 93

def unset(opts)
  opts.each do |k, v|
    case k
    when :attrs
      v.each { |attr| attrs.unset(attr) }

    else
      raise "unsupported option '#{k}'"
    end
  end

  save_config
end

#userdir(user) ⇒ Object 



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# File 'lib/osctld/group.rb', line 139

def userdir(user)
  File.join(
    user.userdir,
    *name.split('/').drop(1).map { |v| "group.#{v}" },
    'cts'
  )
end

#users ⇒ Object 



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# File 'lib/osctld/group.rb', line 250

def users
  ret = []

  DB::Containers.get.each do |ct|
    next if ct.pool != pool || ct.group != self || ret.include?(ct.user)

    ret << ct.user
  end

  ret
end