Module: Puppet::Util

Extended by:
POSIX, SymbolicFileMode
Included in:
Puppet, Application, Application, Configurer, Confine, Interface, Network::AuthStore::Declaration, Node::Exec, Parameter, Parameter, Parser::Compiler, Parser::Functions, Parser::Resource, Parser::Resource::Param, Parser::TemplateWrapper, Provider, Provider, Resource::Catalog::Compiler, Transaction, Type, Type, ClassGen, FileParsing, FileParsing::FileRecord, InstanceLoader, Log, Log, ProviderFeatures::ProviderFeature, Reference, Storage
Defined in:
lib/puppet/util.rb,
lib/puppet/util/platform.rb,
lib/puppet/util/run_mode.rb,
lib/puppet/util/command_line.rb,
lib/puppet/util/execution_stub.rb,
lib/puppet/util/constant_inflector.rb,
lib/puppet/util/symbolic_file_mode.rb,
lib/puppet/util/command_line/trollop.rb,
lib/puppet/util/command_line/puppet_option_parser.rb

Defined Under Namespace

Modules: Backups, Checksums, ClassGen, Colors, ConstantInflector, Diff, Docs, Errors, Execution, FileParsing, HttpProxy, IniConfig, InstanceLoader, Ldap, Libuser, Limits, Logging, MethodHelper, MonkeyPatches, NagiosMaker, POSIX, Package, Platform, Profiler, ProviderFeatures, PsychSupport, RDoc, RetryAction, RubyGems, SELinux, SSL, SUIDManager, Splayer, SymbolicFileMode, Tagging, Terminal, Warnings, Watcher, Windows, Yaml Classes: Autoload, CommandLine, ExecutionStub, Feature, FileType, FileWatcher, JsonLockfile, Lockfile, Log, Metric, NetworkDevice, Pidlock, Reference, ResourceTemplate, RunMode, Storage, TagSet, UnixRunMode, WatchedFile, WindowsRunMode

Constant Summary collapse

AbsolutePathWindows = 
%r!^(?:(?:[A-Z]:#{slash})|(?:#{slash}#{slash}#{label}#{slash}#{label})|(?:#{slash}#{slash}\?#{slash}#{label}))!io
AbsolutePathPosix = 
%r!^/!
DEFAULT_POSIX_MODE =

Replace a file, securely. This takes a block, and passes it the file handle of a file open for writing. Write the replacement content inside the block and it will safely replace the target file.

This method will make no changes to the target file until the content is successfully written and the block returns without raising an error.

As far as possible the state of the existing file, such as mode, is preserved. This works hard to avoid loss of any metadata, but will result in an inode change for the file.

Arguments: ‘filename`, `default_mode`

The filename is the file we are going to replace.

The default_mode is the mode to use when the target file doesn’t already exist; if the file is present we copy the existing mode/owner/group values across. The default_mode can be expressed as an octal integer, a numeric string (ie ‘0664’) or a symbolic file mode.

0644
DEFAULT_WINDOWS_MODE = 
nil

Constants included from POSIX

POSIX::LOCALE_ENV_VARS, POSIX::USER_ENV_VARS

Constants included from SymbolicFileMode

SymbolicFileMode::SetGIDBit, SymbolicFileMode::SetUIDBit, SymbolicFileMode::StickyBit, SymbolicFileMode::SymbolicMode, SymbolicFileMode::SymbolicSpecialToBit

Class Method Summary collapse

Methods included from POSIX

get_posix_field, gid, idfield, methodbyid, methodbyname, search_posix_field, uid

Methods included from SymbolicFileMode

normalize_symbolic_mode, symbolic_mode_to_int, valid_symbolic_mode?

Class Method Details

.absolute_path?(path, platform = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/util.rb', line 192

def absolute_path?(path, platform=nil)
  # Ruby only sets File::ALT_SEPARATOR on Windows and the Ruby standard
  # library uses that to test what platform it's on.  Normally in Puppet we
  # would use Puppet.features.microsoft_windows?, but this method needs to
  # be called during the initialization of features so it can't depend on
  # that.
  platform ||= Puppet::Util::Platform.windows? ? :windows : :posix
  regex = case platform
          when :windows
            AbsolutePathWindows
          when :posix
            AbsolutePathPosix
          else
            raise Puppet::DevError, "unknown platform #{platform} in absolute_path"
          end

  !! (path =~ regex)
end

.benchmark(*args) ⇒ Object

Raises:



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# File 'lib/puppet/util.rb', line 105

def benchmark(*args)
  msg = args.pop
  level = args.pop
  object = nil

  if args.empty?
    if respond_to?(level)
      object = self
    else
      object = Puppet
    end
  else
    object = args.pop
  end

  raise Puppet::DevError, "Failed to provide level to :benchmark" unless level

  unless level == :none or object.respond_to? level
    raise Puppet::DevError, "Benchmarked object does not respond to #{level}"
  end

  # Only benchmark if our log level is high enough
  if level != :none and Puppet::Util::Log.sendlevel?(level)
    seconds = Benchmark.realtime {
      yield
    }
    object.send(level, msg + (" in %0.2f seconds" % seconds))
    return seconds
  else
    yield
  end
end

.chuser ⇒ Object

Change the process to a different user



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# File 'lib/puppet/util.rb', line 56

def self.chuser
  if group = Puppet[:group]
    begin
      Puppet::Util::SUIDManager.change_group(group, true)
    rescue => detail
      Puppet.warning "could not change to group #{group.inspect}: #{detail}"
      $stderr.puts "could not change to group #{group.inspect}"

      # Don't exit on failed group changes, since it's
      # not fatal
      #exit(74)
    end
  end

  if user = Puppet[:user]
    begin
      Puppet::Util::SUIDManager.change_user(user, true)
    rescue => detail
      $stderr.puts "Could not change to user #{user}: #{detail}"
      exit(74)
    end
  end
end

.deterministic_rand(seed, max) ⇒ Object 



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# File 'lib/puppet/util.rb', line 464

def deterministic_rand(seed,max)
  deterministic_rand_int(seed, max).to_s
end

.deterministic_rand_int(seed, max) ⇒ Object 



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# File 'lib/puppet/util.rb', line 469

def deterministic_rand_int(seed,max)
  if defined?(Random) == 'constant' && Random.class == Class
    Random.new(seed).rand(max)
  else
    srand(seed)
    result = rand(max)
    srand()
    result
  end
end

.exit_on_fail(message, code = 1) { ... } ⇒ Object

Executes a block of code, wrapped with some special exception handling. Causes the ruby interpreter to

exit if the block throws an exception.

Parameters:

  • message (String) —

    a message to log if the block fails

  • code (Integer) (defaults to: 1) —

    the exit code that the ruby interpreter should return if the block fails

Yields:



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# File 'lib/puppet/util.rb', line 445

def exit_on_fail(message, code = 1)
  yield
# First, we need to check and see if we are catching a SystemExit error.  These will be raised
#  when we daemonize/fork, and they do not necessarily indicate a failure case.
rescue SystemExit => err
  raise err

# Now we need to catch *any* other kind of exception, because we may be calling third-party
#  code (e.g. webrick), and we have no idea what they might throw.
rescue Exception => err
  ## NOTE: when debugging spec failures, these two lines can be very useful
  #puts err.inspect
  #puts Puppet::Util.pretty_backtrace(err.backtrace)
  Puppet.log_exception(err, "Could not #{message}: #{err}")
  Puppet::Util::Log.force_flushqueue()
  exit(code)
end

.logmethods(klass, useself = true) ⇒ Object

Create instance methods for each of the log levels. This allows the messages to be a little richer. Most classes will be calling this method.



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# File 'lib/puppet/util.rb', line 83

def self.logmethods(klass, useself = true)
  Puppet::Util::Log.eachlevel { |level|
    klass.send(:define_method, level, proc { |args|
      args = args.join(" ") if args.is_a?(Array)
      if useself

        Puppet::Util::Log.create(
          :level => level,
          :source => self,
          :message => args
        )
      else

        Puppet::Util::Log.create(
          :level => level,
          :message => args
        )
      end
    })
  }
end

.path_to_uri(path) ⇒ Object

Convert a path to a file URI



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# File 'lib/puppet/util.rb', line 213

def path_to_uri(path)
  return unless path

  params = { :scheme => 'file' }

  if Puppet.features.microsoft_windows?
    path = path.gsub(/\\/, '/')

    if unc = /^\/\/([^\/]+)(\/.+)/.match(path)
      params[:host] = unc[1]
      path = unc[2]
    elsif path =~ /^[a-z]:\//i
      path = '/' + path
    end
  end

  params[:path] = URI.escape(path)

  begin
    URI::Generic.build(params)
  rescue => detail
    raise Puppet::Error, "Failed to convert '#{path}' to URI: #{detail}", detail.backtrace
  end
end

.pretty_backtrace(backtrace = caller(1)) ⇒ Object

utility method to get the current call stack and format it to a human-readable string (which some IDEs/editors will recognize as links to the line numbers in the trace)



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# File 'lib/puppet/util.rb', line 302

def self.pretty_backtrace(backtrace = caller(1))
  backtrace.collect do |line|
    _, path, rest = /^(.*):(\d+.*)$/.match(line).to_a
    # If the path doesn't exist - like in one test, and like could happen in
    # the world - we should just tolerate it and carry on. --daniel 2012-09-05
    # Also, if we don't match, just include the whole line.
    if path
      path = Pathname(path).realpath rescue path
      "#{path}:#{rest}"
    else
      line
    end
  end.join("\n")
end

.replace_file(file, default_mode, &block) ⇒ Object

Raises:



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# File 'lib/puppet/util.rb', line 340

def replace_file(file, default_mode, &block)
  raise Puppet::DevError, "replace_file requires a block" unless block_given?

  if default_mode
    unless valid_symbolic_mode?(default_mode)
      raise Puppet::DevError, "replace_file default_mode: #{default_mode} is invalid"
    end

    mode = symbolic_mode_to_int(normalize_symbolic_mode(default_mode))
  else
    if Puppet.features.microsoft_windows?
      mode = DEFAULT_WINDOWS_MODE
    else
      mode = DEFAULT_POSIX_MODE
    end
  end

  begin
    file     = Puppet::FileSystem.pathname(file)
    tempfile = Puppet::FileSystem::Uniquefile.new(Puppet::FileSystem.basename_string(file), Puppet::FileSystem.dir_string(file))

    # Set properties of the temporary file before we write the content, because
    # Tempfile doesn't promise to be safe from reading by other people, just
    # that it avoids races around creating the file.
    #
    # Our Windows emulation is pretty limited, and so we have to carefully
    # and specifically handle the platform, which has all sorts of magic.
    # So, unlike Unix, we don't pre-prep security; we use the default "quite
    # secure" tempfile permissions instead.  Magic happens later.
    if !Puppet.features.microsoft_windows?
      # Grab the current file mode, and fall back to the defaults.
      effective_mode =
      if Puppet::FileSystem.exist?(file)
        stat = Puppet::FileSystem.lstat(file)
        tempfile.chown(stat.uid, stat.gid)
        stat.mode
      else
        mode
      end

      if effective_mode
        # We only care about the bottom four slots, which make the real mode,
        # and not the rest of the platform stat call fluff and stuff.
        tempfile.chmod(effective_mode & 07777)
      end
    end

    # OK, now allow the caller to write the content of the file.
    yield tempfile

    # Now, make sure the data (which includes the mode) is safe on disk.
    tempfile.flush
    begin
      tempfile.fsync
    rescue NotImplementedError
      # fsync may not be implemented by Ruby on all platforms, but
      # there is absolutely no recovery path if we detect that.  So, we just
      # ignore the return code.
      #
      # However, don't be fooled: that is accepting that we are running in
      # an unsafe fashion.  If you are porting to a new platform don't stub
      # that out.
    end

    tempfile.close

    if Puppet.features.microsoft_windows?
      # Windows ReplaceFile needs a file to exist, so touch handles this
      if !Puppet::FileSystem.exist?(file)
        Puppet::FileSystem.touch(file)
        if mode
          Puppet::Util::Windows::Security.set_mode(mode, Puppet::FileSystem.path_string(file))
        end
      end
      # Yes, the arguments are reversed compared to the rename in the rest
      # of the world.
      Puppet::Util::Windows::File.replace_file(FileSystem.path_string(file), tempfile.path)

    else
      File.rename(tempfile.path, Puppet::FileSystem.path_string(file))
    end
  ensure
    # in case an error occurred before we renamed the temp file, make sure it
    # gets deleted
    if tempfile
      tempfile.close!
    end
  end


  # Ideally, we would now fsync the directory as well, but Ruby doesn't
  # have support for that, and it doesn't matter /that/ much...

  # Return something true, and possibly useful.
  file
end

.safe_posix_fork(stdin = $stdin, stdout = $stdout, stderr = $stderr, &block) ⇒ Object 



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# File 'lib/puppet/util.rb', line 257

def safe_posix_fork(stdin=$stdin, stdout=$stdout, stderr=$stderr, &block)
  child_pid = Kernel.fork do
    $stdin.reopen(stdin)
    $stdout.reopen(stdout)
    $stderr.reopen(stderr)

    begin
      Dir.foreach('/proc/self/fd') do |f|
        if f != '.' && f != '..' && f.to_i >= 3
          IO::new(f.to_i).close rescue nil
        end
      end
    rescue Errno::ENOENT # /proc/self/fd not found
      3.upto(256){|fd| IO::new(fd).close rescue nil}
    end

    block.call if block
  end
  child_pid
end

.symbolizehash(hash) ⇒ Object 



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# File 'lib/puppet/util.rb', line 279

def symbolizehash(hash)
  newhash = {}
  hash.each do |name, val|
    name = name.intern if name.respond_to? :intern
    newhash[name] = val
  end
  newhash
end

.thinmark ⇒ Object

Just benchmark, with no logging.



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# File 'lib/puppet/util.rb', line 290

def thinmark
  seconds = Benchmark.realtime {
    yield
  }

  seconds
end

.uri_to_path(uri) ⇒ Object

Get the path component of a URI



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# File 'lib/puppet/util.rb', line 240

def uri_to_path(uri)
  return unless uri.is_a?(URI)

  path = URI.unescape(uri.path)

  if Puppet.features.microsoft_windows? and uri.scheme == 'file'
    if uri.host
      path = "//#{uri.host}" + path # UNC
    else
      path.sub!(/^\//, '')
    end
  end

  path
end

.which(bin) ⇒ String

Resolve a path for an executable to the absolute path. This tries to behave in the same manner as the unix ‘which` command and uses the `PATH` environment variable.

Parameters:

  • bin (String) —

    the name of the executable to find.

Returns:

  • (String) —

    the absolute path to the found executable.



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# File 'lib/puppet/util.rb', line 146

def which(bin)
  if absolute_path?(bin)
    return bin if FileTest.file? bin and FileTest.executable? bin
  else
    ENV['PATH'].split(File::PATH_SEPARATOR).each do |dir|
      begin
        dest = File.expand_path(File.join(dir, bin))
      rescue ArgumentError => e
        # if the user's PATH contains a literal tilde (~) character and HOME is not set, we may get
        # an ArgumentError here.  Let's check to see if that is the case; if not, re-raise whatever error
        # was thrown.
        if e.to_s =~ /HOME/ and (ENV['HOME'].nil? || ENV['HOME'] == "")
          # if we get here they have a tilde in their PATH.  We'll issue a single warning about this and then
          # ignore this path element and carry on with our lives.
          Puppet::Util::Warnings.warnonce("PATH contains a ~ character, and HOME is not set; ignoring PATH element '#{dir}'.")
        elsif e.to_s =~ /doesn't exist|can't find user/
          # ...otherwise, we just skip the non-existent entry, and do nothing.
          Puppet::Util::Warnings.warnonce("Couldn't expand PATH containing a ~ character; ignoring PATH element '#{dir}'.")
        else
          raise
        end
      else
        if Puppet.features.microsoft_windows? && File.extname(dest).empty?
          exts = ENV['PATHEXT']
          exts = exts ? exts.split(File::PATH_SEPARATOR) : %w[.COM .EXE .BAT .CMD]
          exts.each do |ext|
            destext = File.expand_path(dest + ext)
            return destext if FileTest.file? destext and FileTest.executable? destext
          end
        end
        return dest if FileTest.file? dest and FileTest.executable? dest
      end
    end
  end
  nil
end

.withenv(hash) ⇒ Object

Run some code with a specific environment. Resets the environment back to what it was at the end of the code.



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# File 'lib/puppet/util.rb', line 28

def self.withenv(hash)
  saved = ENV.to_hash
  hash.each do |name, val|
    ENV[name.to_s] = val
  end

  yield
ensure
  ENV.clear
  saved.each do |name, val|
    ENV[name] = val
  end
end

.withumask(mask) ⇒ Object

Execute a given chunk of code with a new umask.



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# File 'lib/puppet/util.rb', line 44

def self.withumask(mask)
  cur = File.umask(mask)

  begin
    yield
  ensure
    File.umask(cur)
  end
end