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# Author:: Adam Jacob (<adam@chef.io>)
# Copyright:: Copyright 2008-2016, 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 "chef/config"
require "chef/provider/package"
require "chef/mixin/which"
require "chef/mixin/shell_out"
require "singleton"
require "chef/provider/package/yum/rpm_utils"
class Chef
class Provider
class Package
class Yum < Chef::Provider::Package
# Cache for our installed and available packages, pulled in from yum-dump.py
class YumCache
include Chef::Mixin::Which
include Chef::Mixin::ShellOut
include Singleton
attr_accessor :yum_binary
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 = []
@extra_repo_control = nil
# these are for subsequent runs if we are on an interval
Chef::Client.when_run_starts do
YumCache.instance.reload
end
end
attr_reader :extra_repo_control
# Cache management
#
def yum_dump_path
::File.join(::File.dirname(__FILE__), "yum-dump.py")
end
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
if @extra_repo_control
opts << " #{@extra_repo_control}"
end
opts << " --yum-lock-timeout #{Chef::Config[:yum_lock_timeout]}"
one_line = false
error = nil
status = nil
begin
status = shell_out!("#{python_bin} #{yum_dump_path}#{opts}", :timeout => Chef::Config[:yum_timeout])
status.stdout.each_line 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]) (\S+)$}
name = $1
epoch = $2
version = $3
release = $4
arch = $5
provides = parse_provides($6)
type = $7
repoid = $8
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, repoid)
@rpmdb << pkg
end
error = status.stderr
rescue Mixlib::ShellOut::CommandTimeout => e
Chef::Log.error("#{yum_dump_path} exceeded timeout #{Chef::Config[:yum_timeout]}")
raise(e)
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
def python_bin
yum_executable = which(yum_binary)
if yum_executable && shabang?(yum_executable)
shabang_or_fallback(extract_interpreter(yum_executable))
else
Chef::Log.warn("Yum executable not found or doesn't start with #!. Using default python.")
"/usr/bin/python"
end
rescue StandardError => e
Chef::Log.warn("An error occurred attempting to determine correct python executable. Using default.")
Chef::Log.debug(e)
"/usr/bin/python"
end
def extract_interpreter(file)
::File.open(file, "r", &:readline)[2..-1].strip
end
# dnf based systems have a yum shim that has /bin/bash as the interpreter. Don't use this.
def shabang_or_fallback(interpreter)
if interpreter == "/bin/bash"
Chef::Log.warn("Yum executable interpreter is /bin/bash. Falling back to default python.")
"/usr/bin/python"
else
interpreter
end
end
def shabang?(file)
::File.open(file, "r") do |f|
f.read(2) == '#!'
end
rescue Errno::ENOENT
false
end
def reload
@next_refresh = :all
end
def reload_installed
@next_refresh = :installed
end
def reload_provides
@next_refresh = :provides
end
def reset
@rpmdb.clear
end
def reset_installed
@rpmdb.clear_installed
end
# Querying the cache
#
# Check for package by name or name+arch
def package_available?(package_name)
refresh
if @rpmdb.lookup(package_name)
return true
else
if package_name =~ %r{^(.*)\.(.*)$}
pkg_name = $1
pkg_arch = $2
if matches = @rpmdb.lookup(pkg_name)
matches.each do |m|
return true if m.arch == pkg_arch
end
end
end
end
return false
end
# Returns a array of packages satisfying an RPMDependency
def packages_from_require(rpmdep)
refresh
@rpmdb.whatprovides(rpmdep)
end
# Check if a package-version.arch is available to install
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
# Return the source repository for a package-version.arch
def package_repository(package_name, desired_version, arch = nil)
package(package_name, arch, true, false) do |pkg|
return pkg.repoid if desired_version == pkg.version.to_s
end
return nil
end
# Return the latest available version for a package.arch
def available_version(package_name, arch = nil)
version(package_name, arch, true, false)
end
alias :candidate_version :available_version
# Return the currently installed version for a package.arch
def installed_version(package_name, arch = nil)
version(package_name, arch, false, true)
end
# Return an array of packages allowed to be installed multiple times, such as the kernel
def allow_multi_install
refresh
@allow_multi_install
end
def enable_extra_repo_control(arg)
# Don't touch cache if it's the same repos as the last load
unless @extra_repo_control == arg
@extra_repo_control = arg
reload
end
end
def disable_extra_repo_control
# Only force reload when set
if @extra_repo_control
@extra_repo_control = nil
reload
end
end
private
def version(package_name, arch = nil, is_available = false, is_installed = false)
package(package_name, arch, is_available, is_installed) do |pkg|
if block_given?
yield pkg.version.to_s
else
# first match is latest version
return pkg.version.to_s
end
end
if block_given?
return self
else
return nil
end
end
def package(package_name, arch = nil, is_available = false, is_installed = false)
refresh
packages = @rpmdb[package_name]
if packages
packages.each do |pkg|
if is_available
next unless @rpmdb.available?(pkg)
end
if is_installed
next unless @rpmdb.installed?(pkg)
end
if arch
next unless pkg.arch == arch
end
if block_given?
yield pkg
else
# first match is latest version
return pkg
end
end
end
if block_given?
return self
else
return nil
end
end
# Parse provides from yum-dump.py output
def parse_provides(string)
ret = []
# ['atk = 1.12.2-1.fc6', 'libatk-1.0.so.0']
string.split(", ").each do |seg|
# 'atk = 1.12.2-1.fc6'
if seg =~ %r{^'(.*)'$}
ret << RPMProvide.parse($1)
end
end
return ret
end
end # YumCache
end
end
end
end
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