Module: UnixUtils

Defined in:
lib/unix_utils.rb,
lib/unix_utils/version.rb

Constant Summary collapse

BUFSIZE = 
2**16
VERSION = 
"0.0.15"

Class Method Summary collapse

Class Method Details

._spawn(argv, input, output, error) ⇒ Object 



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# File 'lib/unix_utils.rb', line 293

def self._spawn(argv, input, output, error)
  # lifted from posix-spawn
  # https://github.com/rtomayko/posix-spawn/blob/master/lib/posix/spawn/child.rb
  Open3.popen3(*argv) do |stdin, stdout, stderr|
    readers = [stdout, stderr]
    if RUBY_DESCRIPTION =~ /jruby 1.7.0/
      readers.delete stderr
    end
    writers = if input
      [stdin]
    else
      stdin.close
      []
    end
    while readers.any? or writers.any?
      ready = IO.select(readers, writers, readers + writers)
      # write to stdin stream
      ready[1].each do |fd|
        begin
          boom = nil
          size = fd.write input.read(BUFSIZE)
        rescue Errno::EPIPE => boom
        rescue Errno::EAGAIN, Errno::EINTR
        end
        if boom || size < BUFSIZE
          stdin.close
          input.close
          writers.delete stdin
        end
      end
      # read from stdout and stderr streams
      ready[0].each do |fd|
        buf = (fd == stdout) ? output : error
        if fd.eof?
          readers.delete fd
          fd.close
        else
          begin
            buf << fd.readpartial(BUFSIZE)
          rescue Errno::EAGAIN, Errno::EINTR
          end
        end
      end
    end
    # thanks @tmm1 and @rtomayko for showing how it's done!
  end
end

.available?(bin) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/unix_utils.rb', line 242

def self.available?(bin) # :nodoc:
  bin = bin.to_s
  return @@available_query[bin] if defined?(@@available_query) and @@available_query.is_a?(Hash) and @@available_query.has_key?(bin)
  @@available_query ||= {}
  `which #{bin}`
  @@available_query[bin] = $?.success?
end

.awk(infile, *expr) ⇒ Object

–



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# File 'lib/unix_utils.rb', line 163

def self.awk(infile, *expr)
  infile = File.expand_path infile
  outfile = tmp_path infile
  bin = available?('gawk') ? 'gawk' : 'awk'
  argv = [bin, expr, infile].flatten
  spawn argv, :write_to => outfile
  outfile
end

.bunzip2(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 119

def self.bunzip2(infile)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = ['bunzip2', '--stdout', infile]
  spawn argv, :write_to => outfile
  outfile
end

.bzip2(infile) ⇒ Object

–



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# File 'lib/unix_utils.rb', line 129

def self.bzip2(infile)
  infile = File.expand_path infile
  outfile = tmp_path infile, '.bz2'
  argv = ['bzip2', '--keep', '--stdout', infile]
  spawn argv, :write_to => outfile
  outfile
end

.curl(url, form_data = nil) ⇒ Object 



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# File 'lib/unix_utils.rb', line 13

def self.curl(url, form_data = nil)
  outfile = tmp_path url
  if url.start_with?('file://') or not url.include?('://')
    # deal with local files
    infile = File.expand_path url.sub('file://', '')
    unless File.readable?(infile)
      raise "[unix_utils] #{url.inspect} does not exist or is not readable on the local filesystem."
    end
    FileUtils.cp infile, outfile
    return outfile
  end
  uri = URI.parse url
  argv = [ 'curl', '--location', '--show-error', '--silent', '--compressed', '--header', 'Expect: ' ]
  if form_data
    argv += [ '--data', form_data ]
  end
  argv += [ uri.to_s, '--output', outfile ]
  spawn argv
  outfile
end

.cut(infile, character_positions) ⇒ Object

specify character_positions as a string like “3-5” or “3,9-10”



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# File 'lib/unix_utils.rb', line 226

def self.cut(infile, character_positions)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = ['cut', '-c', character_positions, infile]
  spawn argv, :write_to => outfile
  outfile
end

.dos2unix(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 190

def self.dos2unix(infile)
  infile = File.expand_path infile
  if available?('gawk') or available?('awk')
    awk infile, '{ sub(/\r/, ""); printf("%s\n", $0) }'
  else
    perl infile, 's/\r\n|\n|\r/\n/g'
  end
end

.du(srcdir) ⇒ Object 



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# File 'lib/unix_utils.rb', line 77

def self.du(srcdir)
  srcdir = File.expand_path srcdir
  argv = ['du', '-sk', srcdir]
  stdout = spawn argv
  stdout.strip.split(/\s+/).first.to_i
end

.gunzip(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 111

def self.gunzip(infile)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = ['gunzip', '--stdout', infile]
  spawn argv, :write_to => outfile
  outfile
end

.gzip(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 153

def self.gzip(infile)
  infile = File.expand_path infile
  outfile = tmp_path infile, '.gz'
  argv = ['gzip', '--stdout', infile]
  spawn argv, :write_to => outfile
  outfile
end

.head(infile, lines) ⇒ Object 



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# File 'lib/unix_utils.rb', line 217

def self.head(infile, lines)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = ['head', '-n', lines.to_s, infile]
  spawn argv, :write_to => outfile
  outfile
end

.iconv(infile, to, from) ⇒ Object 



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# File 'lib/unix_utils.rb', line 234

def self.iconv(infile, to, from)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = ['iconv', '-c', '-t', to, '-f', from, infile]
  spawn argv, :write_to => outfile
  outfile
end

.md5sum(infile) ⇒ Object

– os x 10.6.8; most platforms $ openssl dgst -md5 .bashrc MD5(.bashrc)= 88f464fb6d1d6fe9141135248bf7b265 ubuntu 11.04; fedora 7; gentoo $ md5sum –binary .mysql_history 8d01e54ab8142d6786850e22d55a1b6c *.mysql_history



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# File 'lib/unix_utils.rb', line 64

def self.md5sum(infile)
  infile = File.expand_path infile
  if available?('md5sum')
    argv = ['md5sum', '--binary', infile]
    stdout = spawn argv
    stdout.strip.split(' ').first
  else
    argv = ['openssl', 'dgst', '-md5', infile]
    stdout = spawn argv
    stdout.strip.split(' ').last
  end
end

.method_missing(method_id, *args) ⇒ Object 



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# File 'lib/unix_utils.rb', line 341

def self.method_missing(method_id, *args)
  base_method_id = method_id.to_s.chomp('_s')
  if respond_to?(base_method_id)
    begin
      outfile = send(*([base_method_id]+args))
      File.read outfile
    ensure
      FileUtils.rm_f outfile
    end
  else
    super
  end
end

.perl(infile, *expr) ⇒ Object

Yes, this is a very limited use of perl.



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# File 'lib/unix_utils.rb', line 173

def self.perl(infile, *expr)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = [ 'perl', expr.map { |e| ['-pe', e] }, infile ].flatten
  spawn argv, :write_to => outfile
  outfile
end

.sed(infile, *expr) ⇒ Object

POSIX sed, whether it’s provided by sed or gsed



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# File 'lib/unix_utils.rb', line 200

def self.sed(infile, *expr)
  infile = File.expand_path infile
  outfile = tmp_path infile
  bin = available?('sed') ? 'sed' : ['gsed', '--posix']
  argv = [ bin, expr.map { |e| ['-e', e] }, infile ].flatten
  spawn argv, :write_to => outfile
  outfile
end

.shasum(infile, algorithm) ⇒ Object

– most platforms $ openssl dgst -sha256 .bash_profile SHA256(.bash_profile)= ae12206aaa35dc96273ed421f4e85ca26a1707455e3cc9f054c7f5e2e9c53df6 ubuntu 11.04 $ shasum -a 256 –portable .mysql_history 856aa27deb0b80b41031c2ddf722af28ba2a8c4999ff9cf2d45f33bc67d992ba ?.mysql_history fedora 7 $ sha256sum –binary .bash_profile 01b1210962b3d1e5e1ccba26f93d98efbb7b315b463f9f6bdb40ab496728d886 *.bash_profile



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# File 'lib/unix_utils.rb', line 44

def self.shasum(infile, algorithm)
  infile = File.expand_path infile
  if available?('shasum')
    argv = ['shasum', '--binary', '-a', algorithm.to_s, infile]
    stdout = spawn argv
    stdout.strip.split(' ').first
  else
    argv = ['openssl', 'dgst', "-sha#{algorithm}", infile]
    stdout = spawn argv
    stdout.strip.split(' ').last
  end
end

.spawn(argv, options = {}) ⇒ Object

:nodoc:



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# File 'lib/unix_utils.rb', line 258

def self.spawn(argv, options = {}) # :nodoc:
  input = if (read_from = options[:read_from])
    if RUBY_DESCRIPTION =~ /jruby 1.7.0/
      raise "[unix_utils] Can't use `#{argv.first}` since JRuby 1.7.0 has a broken IO implementation!"
    end
    File.open(read_from, 'r')
  end
  output = if (write_to = options[:write_to])
    output_redirected = true
    File.open(write_to, 'wb')
  else
    output_redirected = false
    StringIO.new
  end
  error = StringIO.new
  if (chdir = options[:chdir])
    Dir.chdir(chdir) do
      _spawn argv, input, output, error
    end
  else
    _spawn argv, input, output, error
  end
  error.rewind
  unless (whole_error = error.read).empty?
    $stderr.puts "[unix_utils] `#{argv.join(' ')}` STDERR:"
    $stderr.puts whole_error
  end
  unless output_redirected
    output.rewind
    output.read
  end
ensure
  [input, output, error].each { |io| io.close if io and not io.closed? }
end

.tail(infile, lines) ⇒ Object 



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# File 'lib/unix_utils.rb', line 209

def self.tail(infile, lines)
  infile = File.expand_path infile
  outfile = tmp_path infile
  argv = ['tail', '-n', lines.to_s, infile]
  spawn argv, :write_to => outfile
  outfile
end

.tar(srcdir) ⇒ Object 



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# File 'lib/unix_utils.rb', line 137

def self.tar(srcdir)
  srcdir = File.expand_path srcdir
  outfile = tmp_path srcdir, '.tar'
  argv = ['tar', '-cf', outfile, '-C', srcdir, '.']
  spawn argv
  outfile
end

.tmp_path(ancestor, extname = nil) ⇒ Object

:nodoc:



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# File 'lib/unix_utils.rb', line 250

def self.tmp_path(ancestor, extname = nil) # :nodoc:
  ancestor = ancestor.to_s
  extname ||= File.extname ancestor
  basename = File.basename ancestor.gsub(/unix_utils_[a-f0-9]{8,}_/, '')
  basename.gsub! /\W+/, '_'
  File.join Dir.tmpdir, "unix_utils_#{SecureRandom.hex(4)}_#{basename[0..(234-extname.length)]}#{extname}"
end

.unix2dos(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 181

def self.unix2dos(infile)
  infile = File.expand_path infile
  if available?('gawk') or available?('awk')
    awk infile, '{ sub(/\r/, ""); printf("%s\r\n", $0) }'
  else
    perl infile, 's/\r\n|\n|\r/\r\n/g'
  end
end

.untar(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 102

def self.untar(infile)
  infile = File.expand_path infile
  destdir = tmp_path infile
  FileUtils.mkdir destdir
  argv = ['tar', '-xf', infile, '-C', destdir]
  spawn argv
  destdir
end

.unzip(infile) ⇒ Object

–



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# File 'lib/unix_utils.rb', line 93

def self.unzip(infile)
  infile = File.expand_path infile
  destdir = tmp_path infile
  FileUtils.mkdir destdir
  argv = ['unzip', '-qq', '-n', infile, '-d', destdir]
  spawn argv
  destdir
end

.wc(infile) ⇒ Object 



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# File 'lib/unix_utils.rb', line 84

def self.wc(infile)
  infile = File.expand_path infile
  argv = ['wc', infile]
  stdout = spawn argv
  stdout.strip.split(/\s+/)[0..2].map { |s| s.to_i }
end

.zip(srcdir) ⇒ Object 



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# File 'lib/unix_utils.rb', line 145

def self.zip(srcdir)
  srcdir = File.expand_path srcdir
  outfile = tmp_path srcdir, '.zip'
  argv = ['zip', '-rq', outfile, '.']
  spawn argv, :chdir => srcdir
  outfile
end