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✏️ Editing: tmpdir.rb

#
# tmpdir - retrieve temporary directory path
#
# $Id: tmpdir.rb 40825 2013-05-19 03:10:21Z ktsj $
#

require 'fileutils'
begin
  require 'etc.so'
rescue LoadError
end

class Dir

@@systmpdir ||= defined?(Etc.systmpdir) ? Etc.systmpdir : '/tmp'

##
  # Returns the operating system's temporary file path.

def Dir::tmpdir
    if $SAFE > 0
      tmp = @@systmpdir
    else
      tmp = nil
      for dir in [ENV['TMPDIR'], ENV['TMP'], ENV['TEMP'], @@systmpdir, '/tmp', '.']
        next if !dir
        dir = File.expand_path(dir)
        if stat = File.stat(dir) and stat.directory? and stat.writable? and
            (!stat.world_writable? or stat.sticky?)
          tmp = dir
          break
        end rescue nil
      end
      raise ArgumentError, "could not find a temporary directory" if !tmp
      tmp
    end
  end

# Dir.mktmpdir creates a temporary directory.
  #
  # The directory is created with 0700 permission.
  # Application should not change the permission to make the temporary directory accessible from other users.
  #
  # The prefix and suffix of the name of the directory is specified by
  # the optional first argument, <i>prefix_suffix</i>.
  # - If it is not specified or nil, "d" is used as the prefix and no suffix is used.
  # - If it is a string, it is used as the prefix and no suffix is used.
  # - If it is an array, first element is used as the prefix and second element is used as a suffix.
  #
  #  Dir.mktmpdir {|dir| dir is ".../d..." }
  #  Dir.mktmpdir("foo") {|dir| dir is ".../foo..." }
  #  Dir.mktmpdir(["foo", "bar"]) {|dir| dir is ".../foo...bar" }
  #
  # The directory is created under Dir.tmpdir or
  # the optional second argument <i>tmpdir</i> if non-nil value is given.
  #
  #  Dir.mktmpdir {|dir| dir is "#{Dir.tmpdir}/d..." }
  #  Dir.mktmpdir(nil, "/var/tmp") {|dir| dir is "/var/tmp/d..." }
  #
  # If a block is given,
  # it is yielded with the path of the directory.
  # The directory and its contents are removed
  # using FileUtils.remove_entry before Dir.mktmpdir returns.
  # The value of the block is returned.
  #
  #  Dir.mktmpdir {|dir|
  #    # use the directory...
  #    open("#{dir}/foo", "w") { ... }
  #  }
  #
  # If a block is not given,
  # The path of the directory is returned.
  # In this case, Dir.mktmpdir doesn't remove the directory.
  #
  #  dir = Dir.mktmpdir
  #  begin
  #    # use the directory...
  #    open("#{dir}/foo", "w") { ... }
  #  ensure
  #    # remove the directory.
  #    FileUtils.remove_entry dir
  #  end
  #
  def Dir.mktmpdir(prefix_suffix=nil, *rest)
    path = Tmpname.create(prefix_suffix || "d", *rest) {|n| mkdir(n, 0700)}
    if block_given?
      begin
        yield path
      ensure
        stat = File.stat(File.dirname(path))
        if stat.world_writable? and !stat.sticky?
          raise ArgumentError, "parent directory is world writable but not sticky"
        end
        FileUtils.remove_entry path
      end
    else
      path
    end
  end

module Tmpname # :nodoc:
    module_function

def tmpdir
      Dir.tmpdir
    end

def make_tmpname(prefix_suffix, n)
      case prefix_suffix
      when String
        prefix = prefix_suffix
        suffix = ""
      when Array
        prefix = prefix_suffix[0]
        suffix = prefix_suffix[1]
      else
        raise ArgumentError, "unexpected prefix_suffix: #{prefix_suffix.inspect}"
      end
      t = Time.now.strftime("%Y%m%d")
      path = "#{prefix}#{t}-#{$$}-#{rand(0x100000000).to_s(36)}"
      path << "-#{n}" if n
      path << suffix
    end

def create(basename, *rest)
      if opts = Hash.try_convert(rest[-1])
        opts = opts.dup if rest.pop.equal?(opts)
        max_try = opts.delete(:max_try)
        opts = [opts]
      else
        opts = []
      end
      tmpdir, = *rest
      if $SAFE > 0 and tmpdir.tainted?
        tmpdir = '/tmp'
      else
        tmpdir ||= tmpdir()
      end
      n = nil
      begin
        path = File.join(tmpdir, make_tmpname(basename, n))
        yield(path, n, *opts)
      rescue Errno::EEXIST
        n ||= 0
        n += 1
        retry if !max_try or n < max_try
        raise "cannot generate temporary name using `#{basename}' under `#{tmpdir}'"
      end
      path
    end
  end
end

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