Class: Chef::Provider::Package::Dnf::PythonHelper

Inherits:
Object
  • Object
show all
Includes:
Mixin::ShellOut, Mixin::Which, Singleton
Defined in:
lib/chef/provider/package/dnf/python_helper.rb

Constant Summary collapse

DNF_HELPER = 
::File.expand_path(::File.join(::File.dirname(__FILE__), "dnf_helper.py")).freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Mixin::ShellOut

apply_default_env, maybe_add_timeout, #shell_out, #shell_out!

Instance Attribute Details

#stderr ⇒ Object

Returns the value of attribute stderr.



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 34

def stderr
  @stderr
end

#stdin ⇒ Object

Returns the value of attribute stdin.



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 32

def stdin
  @stdin
end

#stdout ⇒ Object

Returns the value of attribute stdout.



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 33

def stdout
  @stdout
end

#wait_thr ⇒ Object

Returns the value of attribute wait_thr.



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 35

def wait_thr
  @wait_thr
end

Instance Method Details

#check ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 66

def check
  start if stdin.nil?
end

#compare_versions(version1, version2) ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 70

def compare_versions(version1, version2)
  with_helper do
    json = build_version_query("versioncompare", [version1, version2])
    Chef::Log.trace "sending '#{json}' to python helper"
    stdin.syswrite json + "\n"
    stdout.sysread(4096).chomp.to_i
  end
end

#dnf_command ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 39

def dnf_command
  # platform-python is used for system tools on RHEL 8 and is installed under /usr/libexec
  @dnf_command ||= begin
    cmd = which("platform-python", "python", "python3", "python2", "python2.7", extra_path: "/usr/libexec") do |f|
      shell_out("#{f} -c 'import dnf'").exitstatus == 0
    end
    raise Chef::Exceptions::Package, "cannot find dnf libraries, you may need to use yum_package" unless cmd

    "#{cmd} #{DNF_HELPER}"
  end
end

#query(action, provides, version = nil, arch = nil) ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 80

def query(action, provides, version = nil, arch = nil)
  with_helper do
    json = build_query(action, provides, version, arch)
    Chef::Log.trace "sending '#{json}' to python helper"
    stdin.syswrite json + "\n"
    output = stdout.sysread(4096).chomp
    Chef::Log.trace "got '#{output}' from python helper"
    version = parse_response(output)
    Chef::Log.trace "parsed #{version} from python helper"
    version
  end
end

#reap ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 56

def reap
  unless wait_thr.nil?
    Process.kill("KILL", wait_thr.pid) rescue nil
    stdin.close unless stdin.nil?
    stdout.close unless stdout.nil?
    stderr.close unless stderr.nil?
    wait_thr.value # this calls waitpit()
  end
end

#restart ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 93

def restart
  reap
  start
end

#start ⇒ Object 



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# File 'lib/chef/provider/package/dnf/python_helper.rb', line 51

def start
  ENV["PYTHONUNBUFFERED"] = "1"
  @stdin, @stdout, @stderr, @wait_thr = Open3.popen3(dnf_command)
end