require File.join(File.dirname(__FILE__), "namespace") require File.join(File.dirname(__FILE__), "file", "header") require File.join(File.dirname(__FILE__), "file", "lead") require File.join(File.dirname(__FILE__), "file", "tag") # Much of the code here is derived from knowledge gained by reading the rpm # source code, but mostly it started making more sense after reading this site: # http://www.rpm.org/max-rpm/s1-rpm-file-format-rpm-file-format.html class RPM::File attr_reader :file FLAG_LESS = (1 << 1) # RPMSENSE_LESS = (1 << 1), FLAG_GREATER = (1 << 2) # RPMSENSE_GREATER = (1 << 2), FLAG_EQUAL = (1 << 3) # RPMSENSE_EQUAL = (1 << 3), # from rpm/rpmfi.h FLAG_CONFIG_FILE = (1 << 0) # RPMFILE_CONFIG = (1 << 0) def initialize(file) if file.is_a?(String) file = File.new(file, "r") end @file = file end # def initialize # Return the lead for this rpm # # This 'lead' structure is almost entirely deprecated in the RPM file format. def lead if @lead.nil? # Make sure we're at the beginning of the file. @file.seek(0, IO::SEEK_SET) @lead = ::RPM::File::Lead.new(@file) # TODO(sissel): have 'read' return number of bytes read? @lead.read end return @lead end # def lead # Return the signature header for this rpm def signature lead # Make sure we've parsed the lead... # If signature_type is not 5 (HEADER_SIGNED_TYPE), no signature. if @lead.signature_type != Header::HEADER_SIGNED_TYPE @signature = false return end if @signature.nil? @signature = ::RPM::File::Header.new(@file) @signature.read # signature headers are padded up to an 8-byte boundar, details here: # http://rpm.org/gitweb?p=rpm.git;a=blob;f=lib/signature.c;h=63e59c00f255a538e48cbc8b0cf3b9bd4a4dbd56;hb=HEAD#l204 # Throw away the pad. @file.read(@signature.length % 8) end return @signature end # def signature # Return the header for this rpm. def header signature if @header.nil? @header = ::RPM::File::Header.new(@file) @header.read end return @header end # def header # Returns a file descriptor for the payload. On first invocation, it seeks to # the start of the payload def payload header if @payload.nil? @payload = @file.clone # The payload starts after the lead, signature, and header. Remember the signature has an # 8-byte boundary-rounding. end @payload.seek(@lead.length + @signature.length + @signature.length % 8 + @header.length, IO::SEEK_SET) return @payload end # def payload # Extract this RPM to a target directory. # # This should have roughly the same effect as: # # % rpm2cpio blah.rpm | (cd {target}; cpio -i --make-directories) def extract(target) if !File.directory?(target) raise Errno::ENOENT.new(target) end extractor = IO.popen("#{tags[:payloadcompressor]} -d | (cd #{target}; cpio -i --quiet --make-directories)", "w") buffer = "" buffer.force_encoding("BINARY") payload_fd = payload.clone loop do data = payload_fd.read(16384, buffer) break if data.nil? # eof extractor.write(data) end payload_fd.close extractor.close end # def extract def tags if @tags.nil? @tags = {} header.tags.each do |tag| tags[tag.tag] = tag.value end end @tags end # def taghash # Get all relations of a given type to this package. # # Examples: # # rpm.relation(:require) # rpm.relation(:conflict) # rpm.relation(:provide) # # In the return array-of-arrays, the elements are: # [ name (string), operator (string), version (string) ] # # operator will be ">=", ">", "=", "<", or "<=" # # @return Array of [name, operator, version] def relation(type) name = "#{type}name".to_sym flags = "#{type}flags".to_sym version = "#{type}version".to_sym # There is no data if we are missing all 3 tag types (name/flags/version) # FYI: 'tags.keys' is an array, Array#& does set intersection. return [] if (tags.keys & [name, flags, version]).size != 3 # Find tags name, flags, and version, and return # an array of "name operator version" return tags[name].zip(tags[flags], tags[version]) \ .reduce([]) { |memo, (n,o,v)| memo << [n, operator(o), v] } end # def relation # Get an array of requires defined in this package. # # @return Array of [ [name, operator, version], ... ] def requires return relation(:require) end # def requires # Get an array of conflicts defined in this package. # # @return Array of [ [name, operator, version], ... ] def conflicts return relation(:conflict) end # def conflicts # Get an array of provides defined in this package. # # @return Array of [ [name, operator, version], ... ] def provides return relation(:provide) end # def provides # Get an array of config files def config_files # this stuff seems to be in the 'enum rpmfileAttrs_e' from rpm/rpmfi.h results = [] tags[:fileflags].each_with_index do |flag, i| # The :fileflags (and other :file... tags) are an array, in order of # files in the rpm payload, we want a list of paths of config files. results << files[i] if mask?(flag, FLAG_CONFIG_FILE) end return results end # def config_files # List the files in this RPM. # # This should have roughly the same effect as: # # % rpm2cpio blah.rpm | cpio -it def files return @files unless @files.nil? lister = IO.popen("#{tags[:payloadcompressor]} -d | cpio -it --quiet", "r+") buffer = "" buffer.force_encoding("BINARY") payload_fd = payload.clone output = "" loop do data = payload_fd.read(16384, buffer) break if data.nil? # listerextractor.write(data) lister.write(data) # Read output from the pipe. begin output << lister.read_nonblock(16384) rescue Errno::EAGAIN # do nothing end end lister.close_write # Read remaining output output << lister.read # Split output by newline and strip leading "." @files = output.split("\n").collect { |s| s.gsub(/^\./, "") } return @files ensure lister.close unless lister.nil? payload_fd.close unless payload_fd.nil? end # def files def mask?(value, mask) return (value & mask) == mask end # def mask? def operator(flag) return "<=" if mask?(flag, FLAG_LESS | FLAG_EQUAL) return ">=" if mask?(flag, FLAG_GREATER | FLAG_EQUAL) return "=" if mask?(flag, FLAG_EQUAL) return "<" if mask?(flag, FLAG_LESS) return ">" if mask?(flag, FLAG_GREATER) end # def operator public(:extract, :payload, :header, :lead, :signature, :initialize, :requires, :conflicts, :provides) end # class RPM::File