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#
# Copyright:: Copyright 2016-2017, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require_relative "../../../mixin/which"
require_relative "../../../mixin/shell_out"
require_relative "version"
require "timeout" unless defined?(Timeout)
class Chef
class Provider
class Package
class Dnf < Chef::Provider::Package
class PythonHelper
include Singleton
include Chef::Mixin::Which
include Chef::Mixin::ShellOut
attr_accessor :stdin
attr_accessor :stdout
attr_accessor :stderr
attr_accessor :wait_thr
DNF_HELPER = ::File.expand_path(::File.join(::File.dirname(__FILE__), "dnf_helper.py")).freeze
def dnf_command
# platform-python is used for system tools on RHEL 8 and is installed under /usr/libexec
@dnf_command ||= which("platform-python", "python", "python3", "python2", "python2.7", extra_path: "/usr/libexec") do |f|
shell_out("#{f} -c 'import dnf'").exitstatus == 0
end + " #{DNF_HELPER}"
end
def start
ENV["PYTHONUNBUFFERED"] = "1"
@stdin, @stdout, @stderr, @wait_thr = Open3.popen3(dnf_command)
end
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
def check
start if stdin.nil?
end
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
# @return Array<Version>
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
def restart
reap
start
end
private
# i couldn't figure out how to decompose an evr on the python side, it seems reasonably
# painless to do it in ruby (generally massaging nevras in the ruby side is HIGHLY
# discouraged -- this is an "every rule has an exception" exception -- any additional
# functionality should probably trigger moving this regexp logic into python)
def add_version(hash, version)
epoch = nil
if version =~ /(\S+):(\S+)/
epoch = $1
version = $2
end
if version =~ /(\S+)-(\S+)/
version = $1
release = $2
end
hash["epoch"] = epoch unless epoch.nil?
hash["release"] = release unless release.nil?
hash["version"] = version
end
def build_query(action, provides, version, arch)
hash = { "action" => action }
hash["provides"] = provides
add_version(hash, version) unless version.nil?
hash["arch" ] = arch unless arch.nil?
FFI_Yajl::Encoder.encode(hash)
end
def build_version_query(action, versions)
hash = { "action" => action }
hash["versions"] = versions
FFI_Yajl::Encoder.encode(hash)
end
def parse_response(output)
array = output.split.map { |x| x == "nil" ? nil : x }
array.each_slice(3).map { |x| Version.new(*x) }.first
end
def drain_stderr
output = ""
output += stderr.sysread(4096).chomp until IO.select([stderr], nil, nil, 0).nil?
output
rescue
# we must rescue EOFError, and we don't much care about errors on stderr anyway
output
end
def with_helper
max_retries ||= 5
ret = nil
Timeout.timeout(600) do
check
ret = yield
end
output = drain_stderr
unless output.empty?
Chef::Log.trace "discarding output on stderr from python helper: #{output}"
end
ret
rescue EOFError, Errno::EPIPE, Timeout::Error, Errno::ESRCH => e
output = drain_stderr
if ( max_retries -= 1 ) > 0
unless output.empty?
Chef::Log.trace "discarding output on stderr from python helper: #{output}"
end
restart
retry
else
raise e if output.empty?
raise "dnf-helper.py had stderr output:\n\n#{output}"
end
end
end
end
end
end
end
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