Class: Chef::Provider::Package::Yum::YumCache

Inherits:
Object
  • Object
show all
Includes:
Mixin::Command, Singleton
Defined in:
lib/chef/provider/package/yum.rb

Overview

Cache for our installed and available packages, pulled in from yum-dump.py

Instance Method Summary collapse

Methods included from Mixin::Command

#chdir_or_tmpdir, #handle_command_failures, #not_if, #only_if, #output_of_command, #run_command, #run_command_with_systems_locale

Methods included from Mixin::Command::Windows

#popen4

Methods included from Mixin::Command::Unix

#popen4

Constructor Details

#initialize ⇒ YumCache

Returns a new instance of YumCache.



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# File 'lib/chef/provider/package/yum.rb', line 649

def initialize
  @rpmdb = RPMDb.new

  # Next time @rpmdb is accessed:
  #  :all       - Trigger a run of "yum-dump.py --options --installed-provides", updates
  #               yum's cache and parses options from /etc/yum.conf. Pulls in Provides
  #               dependency data for installed packages only - this data is slow to
  #               gather.
  #  :provides  - Same as :all but pulls in Provides data for available packages as well.
  #               Used as a last resort when we can't find a Provides match.
  #  :installed - Trigger a run of "yum-dump.py --installed", only reads the local rpm
  #               db. Used between client runs for a quick refresh.
  #  :none      - Do nothing, a call to one of the reload methods is required.
  @next_refresh = :all

  @allow_multi_install = []

  # these are for subsequent runs if we are on an interval
  Chef::Client.when_run_starts do
    YumCache.instance.reload
  end
end

Instance Method Details

#allow_multi_install ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 818

def allow_multi_install
  refresh
  @allow_multi_install
end

#available_version(package_name, arch = nil) ⇒ Object Also known as: candidate_version 



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# File 'lib/chef/provider/package/yum.rb', line 809

def available_version(package_name, arch=nil)
  version(package_name, arch, true, false)
end

#installed_version(package_name, arch = nil) ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 814

def installed_version(package_name, arch=nil)
  version(package_name, arch, false, true)
end

#package_available?(package_name) ⇒ Boolean

Querying the cache

Returns:

  • (Boolean) 


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# File 'lib/chef/provider/package/yum.rb', line 786

def package_available?(package_name)
  refresh
  if @rpmdb.lookup(package_name)
    true
  else
    false
  end
end

#packages_from_require(rpmdep) ⇒ Object

Returns a array of packages satisfying an RPMDependency



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# File 'lib/chef/provider/package/yum.rb', line 796

def packages_from_require(rpmdep)
  refresh
  @rpmdb.whatprovides(rpmdep)
end

#refresh ⇒ Object

Cache management



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# File 'lib/chef/provider/package/yum.rb', line 675

def refresh
  case @next_refresh
  when :none
    return nil
  when :installed
    reset_installed
    # fast
    opts=" --installed"
  when :all
    reset
    # medium
    opts=" --options --installed-provides"
  when :provides
    reset
    # slow!
    opts=" --options --all-provides"
  else
    raise ArgumentError, "Unexpected value in next_refresh: #{@next_refresh}"
  end

  one_line = false
  error = nil

  helper = ::File.join(::File.dirname(__FILE__), 'yum-dump.py')

  status = popen4("/usr/bin/python #{helper}#{opts}", :waitlast => true) do |pid, stdin, stdout, stderr|
    stdout.each do |line|
      one_line = true

      line.chomp!

      if line =~ %r{\[option (.*)\] (.*)}
        if $1 == "installonlypkgs"
          @allow_multi_install = $2.split
        else
          raise Chef::Exceptions::Package, "Strange, unknown option line '#{line}' from yum-dump.py"
        end
        next
      end

      if line =~ %r{^(\S+) ([0-9]+) (\S+) (\S+) (\S+) \[(.*)\] ([i,a,r])$}
        name     = $1
        epoch    = $2
        version  = $3
        release  = $4
        arch     = $5
        provides = parse_provides($6)
        type     = $7
      else
        Chef::Log.warn("Problem parsing line '#{line}' from yum-dump.py! " +
                       "Please check your yum configuration.")
        next
      end

      case type
      when "i"
        # if yum-dump was called with --installed this may not be true, but it's okay
        # since we don't touch the @available Set in reload_installed
        available = false
        installed = true
      when "a"
        available = true
        installed = false
      when "r"
        available = true
        installed = true
      end

      pkg = RPMDbPackage.new(name, epoch, version, release, arch, provides, installed, available)
      @rpmdb << pkg
    end

    error = stderr.readlines
  end

  if status.exitstatus != 0
    raise Chef::Exceptions::Package, "Yum failed - #{status.inspect} - returns: #{error}"
  else
    unless one_line
      Chef::Log.warn("Odd, no output from yum-dump.py. Please check " +
                     "your yum configuration.")
    end
  end

  # A reload method must be called before the cache is altered
  @next_refresh = :none
end

#reload ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 763

def reload
  @next_refresh = :all
end

#reload_installed ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 767

def reload_installed
  @next_refresh = :installed
end

#reload_provides ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 771

def reload_provides
  @next_refresh = :provides
end

#reset ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 775

def reset
  @rpmdb.clear
end

#reset_installed ⇒ Object 



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# File 'lib/chef/provider/package/yum.rb', line 779

def reset_installed
  @rpmdb.clear_installed
end

#version_available?(package_name, desired_version, arch = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/chef/provider/package/yum.rb', line 801

def version_available?(package_name, desired_version, arch=nil)
   version(package_name, arch, true, false) do |v|
     return true if desired_version == v
   end

  return false
end