Class: Fixi::Command::Unbag

Inherits:
Object
  • Object
show all
Defined in:
lib/fixi/command/unbag.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.arghelp ⇒ Object 



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# File 'lib/fixi/command/unbag.rb', line 10

def self.arghelp
  "<input-dir> <output-dir>"
end

.details ⇒ Object 



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# File 'lib/fixi/command/unbag.rb', line 14

def self.details
  "Where:\n  input-dir is the base directory of the bag.\n" +
    "  output-dir is the directory in which to import it."
end

.synopsis ⇒ Object 



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# File 'lib/fixi/command/unbag.rb', line 6

def self.synopsis
  "Import files from a BagIt bag"
end

Instance Method Details

#execute(args) ⇒ Object 



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# File 'lib/fixi/command/unbag.rb', line 19

def execute args
  opts = Trollop::options args do
    banner Fixi::Command.banner "unbag"
    opt :absolute, "Show absolute paths. By default, paths are reported
      relative to the index root.".pack
  end

  # validate args and bag dir
  raise "Must specify input directory." unless args[0]
  raise "Must specify output directory." unless args[1]
  raise "Output directory already exists." if File.exists?(args[1])

  input_dir = File.expand_path(args[0])
  output_dir = File.expand_path(args[1])

  index = Fixi::Index.new(File.dirname(output_dir))
  Dir.mkdir(output_dir)

  data_dir = input_dir + "/data"
  raise "No data dir found in input dir." unless File.directory?(data_dir)

  # build hash of manifest algorithm => file path
  manifests = {}
  indexed_algs = index.algorithms.split(",")
  Dir.entries(input_dir).each do |child|
    if child =~ /^manifest-.*\.txt/
      alg = child[9..(child.length - 5)]
      if (indexed_algs.include?(alg))
        manifests[alg] = input_dir + "/" + child
      end
    end
  end

  # copy all data to dest dir, subject to includes and excludes
  Find.find(data_dir) do |abspath|
    unless abspath == data_dir
      relpath = abspath.slice(data_dir.length + 1..-1)
      destpath = output_dir + "/" + relpath
      if index.matches_any?(relpath, index.includes)
        if index.matches_any?(relpath, index.excludes)
          Find.prune
        elsif not File.directory?(abspath)
          begin
            FileUtils.cp(abspath, destpath, :preserve => true)
          rescue
            FileUtils.mkdir_p(File.dirname(destpath))
            FileUtils.cp(abspath, destpath, :preserve => true)
          end
        end
      else
        Find.prune unless File.directory?(abspath)
      end
    end
  end

  # revisit all dirs under output_dir, copying orig dir metadata
  Find.find(output_dir) do |dir|
    if File.directory?(dir) && dir != output_dir
      orig_dir = data_dir + dir[output_dir.length..-1]
      Fixi::set_metadata(dir, File.stat(orig_dir))
    end
  end

  # add paths, sizes, and mtimes to db
  index.find(output_dir) do |abspath|
    relpath = index.relpath(abspath)
    index.add(relpath, false)
  end

  # add manifest entries to db
  manifests.each do |alg, manifest|
    IO.foreach(manifest) do |line|
      i = line.index(" ")
      if i 
        digest = line[0..i-1].downcase
        bagpath = line[i+6..-1].rstrip
        relpath = index.relpath(output_dir + "/" + bagpath)
        index.set_digest(relpath, alg, digest)
      end
    end
  end

  # for all new files, compute any required hashes and print A path/etc
  algs = index.algorithms.split(",")
  index.each(output_dir) do |hash|
    relpath = hash['relpath']
    abspath = index.rootpath + '/' + relpath
    puts "A #{opts[:absolute] ? abspath : relpath}"

    missing_digests = []
    algs.each do |alg|
      missing_digests << alg unless hash[alg]
    end
    if missing_digests.size > 0
      digests = Fixi::digests(missing_digests.join(","))
      hexdigests = Fixi::hexdigests(digests, abspath)
      i = 0
      missing_digests.each do |alg|
        index.set_digest(relpath, alg, hexdigests[i])
        i += 1
      end
    end
  end

end