Class: OsCtld::Commands::Dataset::Delete

Inherits:
Base
  • Object
show all
Includes:
OsCtl::Lib::Utils::Log, Utils::SwitchUser
Defined in:
lib/osctld/commands/dataset/delete.rb

Instance Attribute Summary

Attributes inherited from Base

#client, #client_handler, #id, #opts

Instance Method Summary collapse

Methods included from Utils::SwitchUser

#ct_attach, #ct_control, #ct_exec, #ct_runscript, #ct_syscmd, #init_script, #unlink_file

Methods inherited from Base

#base_execute, #call_cmd, #call_cmd!, cmd, #error, #error!, handle, #handled, #indirect?, #initialize, #manipulate, #manipulation_holder, #ok, #progress, #request_stop, run, run!

Constructor Details

This class inherits a constructor from OsCtld::Commands::Base

Instance Method Details

#delete_mounts(ct, mounts) ⇒ Object (protected)



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# File 'lib/osctld/commands/dataset/delete.rb', line 66

def delete_mounts(ct, mounts)
  if ct.state == :running
    mounts.each do |mnt|
      next unless Dir.exist?(File.join(ct.runtime_rootfs, mnt.mountpoint))

      begin
        ret = ct_syscmd(
          ct,
          "umount #{File.join('/', mnt.mountpoint)}",
          valid_rcs: [1]
        )

        if ret[:exitstatus] == 1 && /not mounted/ !~ ret[:output]
          error!("unable to unmount #{mnt.mountpoint}: #{ret[:output]}")
        end

      rescue SystemCommandFailed => e
        error!("unable to unmount #{mnt.mountpoint}: #{e.message}")
      end
    end
  end

  mounts.each do |mnt|
    ct.mounts.delete_at(mnt.mountpoint)
  end
end

#executeObject



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# File 'lib/osctld/commands/dataset/delete.rb', line 10

def execute
  ct = DB::Containers.find(opts[:id], opts[:pool])
  return error('container not found') unless ct

  name = opts[:name].strip

  if name.empty? || name == '/'
    return error('cannot delete the root dataset')
  end

  manipulate(ct) do
    ds = OsCtl::Lib::Zfs::Dataset.new(
      File.join(ct.dataset.name, name),
      base: ct.dataset.name
    )
    error!("dataset #{ds.name} does not exist") unless ds.exist?

    descendants = ds.descendants

    if descendants.any? && !opts[:recursive]
      error!('dataset has children, recursive delete has to be enabled explicitly')
    end

    mounts = find_mounts(ct, ds, descendants, opts[:recursive])

    if mounts.any?
      error!(
        "the following mountpoints need to be unmounted:\n  "+
        mounts.map { |m| m.mountpoint }.join("\n  ")
      ) if !opts[:unmount]

      delete_mounts(ct, mounts)
    end

    begin
      ds.destroy!(recursive: opts[:recursive])
      ok

    rescue SystemCommandFailed => e
      log(:warn, "Unable to delete dataset: #{e.message}")
      error('delete failed, the dataset is either busy or has children')
    end
  end
end

#find_mounts(ct, ds, descendants, recursive) ⇒ Object (protected)



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# File 'lib/osctld/commands/dataset/delete.rb', line 56

def find_mounts(ct, ds, descendants, recursive)
  datasets = [ds]
  datasets.concat(descendants) if recursive

  ct.mounts.select do |mnt|
    next(false) unless mnt.dataset
    datasets.detect { |ds| ds.relative_name == mnt.dataset.relative_name }
  end.sort { |a, b| a.mountpoint <=> b.mountpoint}.reverse!
end