Class: ConfCtl::Generation::HostList

Inherits:
Object
  • Object
show all
Defined in:
lib/confctl/generation/host_list.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host) ⇒ HostList

Returns a new instance of HostList.

Parameters:

  • host (String) 


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# File 'lib/confctl/generation/host_list.rb', line 64

def initialize(host)
  @host = host
  @generations = []
end

Instance Attribute Details

#host ⇒ String (readonly)

Returns:

  • (String) 


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# File 'lib/confctl/generation/host_list.rb', line 61

def host
  @host
end

Class Method Details

.fetch(machine, mc, profile:) ⇒ Generation::HostList

Parameters:

Returns:



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# File 'lib/confctl/generation/host_list.rb', line 7

def self.fetch(machine, mc, profile:)
  out, = mc.bash_script(<<~END)
    realpath #{profile}

    for generation in `ls -d -1 #{profile}-*-link` ; do
      echo -n "$generation;"
      echo -n "$(readlink $generation);"
      echo -n "$(stat --format=%Y $generation);"

      for kernel_file in kernel bzImage ; do
        [ -h "$generation/$kernel_file" ] && echo -n $(readlink "$generation/$kernel_file")
      done

      echo
    done
  END

  list = new(machine.name)
  lines = out.strip.split("\n")
  current_path = lines.shift
  id_rx = /^#{Regexp.escape(profile)}-(\d+)-link$/

  lines.each do |line|
    link, path, created_at, kernel = line.split(';')

    if id_rx =~ link
      id = ::Regexp.last_match(1).to_i
    else
      warn "Invalid profile generation link '#{link}'"
      next
    end

    kernel_version =
      if kernel && %r{\A/nix/store/[^-]+-linux-([^/]+)} =~ kernel
        ::Regexp.last_match(1)
      end

    list << Generation::Host.new(
      machine,
      profile,
      id,
      path,
      Time.at(created_at.to_i),
      kernel_version,
      current: path == current_path,
      mc:
    )
  end

  list.sort
  list
end

Instance Method Details

#<<(generation) ⇒ Object

Parameters:



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# File 'lib/confctl/generation/host_list.rb', line 70

def <<(generation)
  generations << generation
end

#count ⇒ Integer

Returns:

  • (Integer) 


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# File 'lib/confctl/generation/host_list.rb', line 83

def count
  generations.length
end

#current ⇒ Generation::Host

Returns:



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# File 'lib/confctl/generation/host_list.rb', line 88

def current
  generations.detect(&:current)
end

#each ⇒ Object 



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# File 'lib/confctl/generation/host_list.rb', line 78

def each(&)
  generations.each(&)
end

#sort ⇒ Object 



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# File 'lib/confctl/generation/host_list.rb', line 74

def sort
  generations.sort! { |a, b| a.id <=> b.id }
end