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Edit File : tar_writer.rb \| Size : 7.51 KB
# frozen_string_literal: true # rubocop:disable Style/AsciiComments # Copyright (C) 2004 Mauricio Julio Fernández Pradier # See LICENSE.txt for additional licensing information. # rubocop:enable Style/AsciiComments ## # Allows writing of tar files class Gem::Package::TarWriter class FileOverflow < StandardError; end ## # IO wrapper that allows writing a limited amount of data class BoundedStream ## # Maximum number of bytes that can be written attr_reader :limit ## # Number of bytes written attr_reader :written ## # Wraps +io+ and allows up to +limit+ bytes to be written def initialize(io, limit) @io = io @limit = limit @written = 0 end ## # Writes +data+ onto the IO, raising a FileOverflow exception if the # number of bytes will be more than #limit def write(data) if data.bytesize + @written > @limit raise FileOverflow, "You tried to feed more data than fits in the file." end @io.write data @written += data.bytesize data.bytesize end end ## # IO wrapper that provides only #write class RestrictedStream ## # Creates a new RestrictedStream wrapping +io+ def initialize(io) @io = io end ## # Writes +data+ onto the IO def write(data) @io.write data end end ## # Creates a new TarWriter, yielding it if a block is given def self.new(io) writer = super return writer unless block_given? begin yield writer ensure writer.close end nil end ## # Creates a new TarWriter that will write to +io+ def initialize(io) @io = io @closed = false end ## # Adds file +name+ with permissions +mode+, and yields an IO for writing the # file to def add_file(name, mode) # :yields: io check_closed name, prefix = split_name name init_pos = @io.pos @io.write Gem::Package::TarHeader::EMPTY_HEADER # placeholder for the header yield RestrictedStream.new(@io) if block_given? size = @io.pos - init_pos - 512 remainder = (512 - (size % 512)) % 512 @io.write "\0" * remainder final_pos = @io.pos @io.pos = init_pos header = Gem::Package::TarHeader.new name: name, mode: mode, size: size, prefix: prefix, mtime: Gem.source_date_epoch @io.write header @io.pos = final_pos self end ## # Adds +name+ with permissions +mode+ to the tar, yielding +io+ for writing # the file. The +digest_algorithm+ is written to a read-only +name+.sum # file following the given file contents containing the digest name and # hexdigest separated by a tab. # # The created digest object is returned. def add_file_digest(name, mode, digest_algorithms) # :yields: io digests = digest_algorithms.map do \|digest_algorithm\| digest = digest_algorithm.new digest_name = if digest.respond_to? :name digest.name else digest_algorithm.class.name[/::([^:]+)\z/, 1] end [digest_name, digest] end digests = Hash[digests.flatten] add_file name, mode do \|io\| Gem::Package::DigestIO.wrap io, digests do \|digest_io\| yield digest_io end end digests end ## # Adds +name+ with permissions +mode+ to the tar, yielding +io+ for writing # the file. The +signer+ is used to add a digest file using its # digest_algorithm per add_file_digest and a cryptographic signature in # +name+.sig. If the signer has no key only the checksum file is added. # # Returns the digest. def add_file_signed(name, mode, signer) digest_algorithms = [ signer.digest_algorithm, Gem::Security.create_digest("SHA512"), ].compact.uniq digests = add_file_digest name, mode, digest_algorithms do \|io\| yield io end signature_digest = digests.values.compact.find do \|digest\| digest_name = if digest.respond_to? :name digest.name else digest.class.name[/::([^:]+)\z/, 1] end digest_name == signer.digest_name end raise "no #{signer.digest_name} in #{digests.values.compact}" unless signature_digest if signer.key signature = signer.sign signature_digest.digest add_file_simple "#{name}.sig", 0o444, signature.length do \|io\| io.write signature end end digests end ## # Add file +name+ with permissions +mode+ +size+ bytes long. Yields an IO # to write the file to. def add_file_simple(name, mode, size) # :yields: io check_closed name, prefix = split_name name header = Gem::Package::TarHeader.new(name: name, mode: mode, size: size, prefix: prefix, mtime: Gem.source_date_epoch).to_s @io.write header os = BoundedStream.new @io, size yield os if block_given? min_padding = size - os.written @io.write("\0" min_padding) remainder = (512 - (size % 512)) % 512 @io.write("\0" * remainder) self end ## # Adds symlink +name+ with permissions +mode+, linking to +target+. def add_symlink(name, target, mode) check_closed name, prefix = split_name name header = Gem::Package::TarHeader.new(name: name, mode: mode, size: 0, typeflag: "2", linkname: target, prefix: prefix, mtime: Gem.source_date_epoch).to_s @io.write header self end ## # Raises IOError if the TarWriter is closed def check_closed raise IOError, "closed #{self.class}" if closed? end ## # Closes the TarWriter def close check_closed @io.write "\0" * 1024 flush @closed = true end ## # Is the TarWriter closed? def closed? @closed end ## # Flushes the TarWriter's IO def flush check_closed @io.flush if @io.respond_to? :flush end ## # Creates a new directory in the tar file +name+ with +mode+ def mkdir(name, mode) check_closed name, prefix = split_name(name) header = Gem::Package::TarHeader.new name: name, mode: mode, typeflag: "5", size: 0, prefix: prefix, mtime: Gem.source_date_epoch @io.write header self end ## # Splits +name+ into a name and prefix that can fit in the TarHeader def split_name(name) # :nodoc: if name.bytesize > 256 raise Gem::Package::TooLongFileName.new("File \"#{name}\" has a too long path (should be 256 or less)") end prefix = "" if name.bytesize > 100 parts = name.split("/", -1) # parts are never empty here name = parts.pop # initially empty for names with a trailing slash ("foo/.../bar/") prefix = parts.join("/") # if empty, then it's impossible to split (parts is empty too) while !parts.empty? && (prefix.bytesize > 155 \|\| name.empty?) name = parts.pop + "/" + name prefix = parts.join("/") end if name.bytesize > 100 \|\| prefix.empty? raise Gem::Package::TooLongFileName.new("File \"#{prefix}/#{name}\" has a too long name (should be 100 or less)") end if prefix.bytesize > 155 raise Gem::Package::TooLongFileName.new("File \"#{prefix}/#{name}\" has a too long base path (should be 155 or less)") end end [name, prefix] end end Back

Edit File : tar_writer.rb | Size : 7.51 KB

# frozen_string_literal: true

# rubocop:disable Style/AsciiComments

# Copyright (C) 2004 Mauricio Julio Fernández Pradier
# See LICENSE.txt for additional licensing information.

# rubocop:enable Style/AsciiComments

##
# Allows writing of tar files

class Gem::Package::TarWriter
  class FileOverflow < StandardError; end

##
  # IO wrapper that allows writing a limited amount of data

class BoundedStream
    ##
    # Maximum number of bytes that can be written

attr_reader :limit

##
    # Number of bytes written

attr_reader :written

##
    # Wraps +io+ and allows up to +limit+ bytes to be written

def initialize(io, limit)
      @io = io
      @limit = limit
      @written = 0
    end

##
    # Writes +data+ onto the IO, raising a FileOverflow exception if the
    # number of bytes will be more than #limit

def write(data)
      if data.bytesize + @written > @limit
        raise FileOverflow, "You tried to feed more data than fits in the file."
      end
      @io.write data
      @written += data.bytesize
      data.bytesize
    end
  end

##
  # IO wrapper that provides only #write

class RestrictedStream
    ##
    # Creates a new RestrictedStream wrapping +io+

def initialize(io)
      @io = io
    end

##
    # Writes +data+ onto the IO

def write(data)
      @io.write data
    end
  end

##
  # Creates a new TarWriter, yielding it if a block is given

def self.new(io)
    writer = super

return writer unless block_given?

begin
      yield writer
    ensure
      writer.close
    end

nil
  end

##
  # Creates a new TarWriter that will write to +io+

def initialize(io)
    @io = io
    @closed = false
  end

##
  # Adds file +name+ with permissions +mode+, and yields an IO for writing the
  # file to

def add_file(name, mode) # :yields: io
    check_closed

name, prefix = split_name name

init_pos = @io.pos
    @io.write Gem::Package::TarHeader::EMPTY_HEADER # placeholder for the header

yield RestrictedStream.new(@io) if block_given?

size = @io.pos - init_pos - 512

remainder = (512 - (size % 512)) % 512
    @io.write "\0" * remainder

final_pos = @io.pos
    @io.pos = init_pos

header = Gem::Package::TarHeader.new name: name, mode: mode,
                                         size: size, prefix: prefix,
                                         mtime: Gem.source_date_epoch

@io.write header
    @io.pos = final_pos

self
  end

##
  # Adds +name+ with permissions +mode+ to the tar, yielding +io+ for writing
  # the file.  The +digest_algorithm+ is written to a read-only +name+.sum
  # file following the given file contents containing the digest name and
  # hexdigest separated by a tab.
  #
  # The created digest object is returned.

def add_file_digest(name, mode, digest_algorithms) # :yields: io
    digests = digest_algorithms.map do |digest_algorithm|
      digest = digest_algorithm.new
      digest_name =
        if digest.respond_to? :name
          digest.name
        else
          digest_algorithm.class.name[/::([^:]+)\z/, 1]
        end

[digest_name, digest]
    end

digests = Hash[*digests.flatten]

add_file name, mode do |io|
      Gem::Package::DigestIO.wrap io, digests do |digest_io|
        yield digest_io
      end
    end

digests
  end

##
  # Adds +name+ with permissions +mode+ to the tar, yielding +io+ for writing
  # the file.  The +signer+ is used to add a digest file using its
  # digest_algorithm per add_file_digest and a cryptographic signature in
  # +name+.sig.  If the signer has no key only the checksum file is added.
  #
  # Returns the digest.

def add_file_signed(name, mode, signer)
    digest_algorithms = [
      signer.digest_algorithm,
      Gem::Security.create_digest("SHA512"),
    ].compact.uniq

digests = add_file_digest name, mode, digest_algorithms do |io|
      yield io
    end

signature_digest = digests.values.compact.find do |digest|
      digest_name =
        if digest.respond_to? :name
          digest.name
        else
          digest.class.name[/::([^:]+)\z/, 1]
        end

digest_name == signer.digest_name
    end

raise "no #{signer.digest_name} in #{digests.values.compact}" unless signature_digest

if signer.key
      signature = signer.sign signature_digest.digest

add_file_simple "#{name}.sig", 0o444, signature.length do |io|
        io.write signature
      end
    end

digests
  end

##
  # Add file +name+ with permissions +mode+ +size+ bytes long.  Yields an IO
  # to write the file to.

def add_file_simple(name, mode, size) # :yields: io
    check_closed

name, prefix = split_name name

header = Gem::Package::TarHeader.new(name: name, mode: mode,
                                         size: size, prefix: prefix,
                                         mtime: Gem.source_date_epoch).to_s

@io.write header
    os = BoundedStream.new @io, size

yield os if block_given?

min_padding = size - os.written
    @io.write("\0" * min_padding)

remainder = (512 - (size % 512)) % 512
    @io.write("\0" * remainder)

self
  end

##
  # Adds symlink +name+ with permissions +mode+, linking to +target+.

def add_symlink(name, target, mode)
    check_closed

name, prefix = split_name name

header = Gem::Package::TarHeader.new(name: name, mode: mode,
                                         size: 0, typeflag: "2",
                                         linkname: target,
                                         prefix: prefix,
                                         mtime: Gem.source_date_epoch).to_s

@io.write header

self
  end

##
  # Raises IOError if the TarWriter is closed

def check_closed
    raise IOError, "closed #{self.class}" if closed?
  end

##
  # Closes the TarWriter

def close
    check_closed

@io.write "\0" * 1024
    flush

@closed = true
  end

##
  # Is the TarWriter closed?

def closed?
    @closed
  end

##
  # Flushes the TarWriter's IO

def flush
    check_closed

@io.flush if @io.respond_to? :flush
  end

##
  # Creates a new directory in the tar file +name+ with +mode+

def mkdir(name, mode)
    check_closed

name, prefix = split_name(name)

header = Gem::Package::TarHeader.new name: name, mode: mode,
                                         typeflag: "5", size: 0,
                                         prefix: prefix,
                                         mtime: Gem.source_date_epoch

@io.write header

self
  end

##
  # Splits +name+ into a name and prefix that can fit in the TarHeader

def split_name(name) # :nodoc:
    if name.bytesize > 256
      raise Gem::Package::TooLongFileName.new("File \"#{name}\" has a too long path (should be 256 or less)")
    end

prefix = ""
    if name.bytesize > 100
      parts = name.split("/", -1) # parts are never empty here
      name = parts.pop            # initially empty for names with a trailing slash ("foo/.../bar/")
      prefix = parts.join("/")    # if empty, then it's impossible to split (parts is empty too)
      while !parts.empty? && (prefix.bytesize > 155 || name.empty?)
        name = parts.pop + "/" + name
        prefix = parts.join("/")
      end

if name.bytesize > 100 || prefix.empty?
        raise Gem::Package::TooLongFileName.new("File \"#{prefix}/#{name}\" has a too long name (should be 100 or less)")
      end

if prefix.bytesize > 155
        raise Gem::Package::TooLongFileName.new("File \"#{prefix}/#{name}\" has a too long base path (should be 155 or less)")
      end
    end

[name, prefix]
  end
end

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