Class: LibGems::Format

Inherits:
Object
  • Object
show all
Extended by:
UserInteraction
Defined in:
lib/libgems/format.rb

Overview

LibGems::Format knows the guts of the RubyGem .gem file format and provides the capability to read gem files

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from UserInteraction

methname

Methods included from DefaultUserInteraction

ui, #ui, ui=, #ui=, use_ui, #use_ui

Constructor Details

#initialize(gem_path) ⇒ Format

Constructs a Format representing the gem’s data which came from gem_path



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# File 'lib/libgems/format.rb', line 26

def initialize(gem_path)
  @gem_path = gem_path
end

Instance Attribute Details

#file_entries ⇒ Object

Returns the value of attribute file_entries.



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# File 'lib/libgems/format.rb', line 18

def file_entries
  @file_entries
end

#gem_path ⇒ Object

Returns the value of attribute gem_path.



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# File 'lib/libgems/format.rb', line 19

def gem_path
  @gem_path
end

#spec ⇒ Object

Returns the value of attribute spec.



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# File 'lib/libgems/format.rb', line 17

def spec
  @spec
end

Class Method Details

.from_file_by_path(file_path, security_policy = nil) ⇒ Object

Reads the gem file_path using security_policy and returns a Format representing the data in the gem



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# File 'lib/libgems/format.rb', line 34

def self.from_file_by_path(file_path, security_policy = nil)
  unless File.exist?(file_path)
    raise LibGems::Exception, "Cannot load gem at [#{file_path}] in #{Dir.pwd}"
  end

  start = File.read file_path, 20

  if start.nil? or start.length < 20 then
    nil
  elsif start.include?("MD5SUM =") # old version gems
    require 'libgems/old_format'

    LibGems::OldFormat.from_file_by_path file_path
  else
    open file_path, LibGems.binary_mode do |io|
      from_io io, file_path, security_policy
    end
  end
end

.from_io(io, gem_path = "(io)", security_policy = nil) ⇒ Object

Reads a gem from io at gem_path using security_policy and returns a Format representing the data from the gem



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# File 'lib/libgems/format.rb', line 58

def self.from_io(io, gem_path="(io)", security_policy = nil)
  format = new gem_path

  LibGems::Package.open io, 'r', security_policy do |pkg|
    format.spec = pkg.metadata
    format.file_entries = []

    pkg.each do |entry|
      size = entry.header.size
      mode = entry.header.mode

      format.file_entries << [{
          "size" => size, "mode" => mode, "path" => entry.full_name,
        },
        entry.read
      ]
    end
  end

  format
end