/usr/lib/ruby/vendor_ruby/systemu.rb is in ruby-systemu 2.6.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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require 'tmpdir'
require 'socket'
require 'fileutils'
require 'rbconfig'
require 'thread'
class Object
def systemu(*a, &b) SystemUniversal.new(*a, &b).systemu end
end
class SystemUniversal
#
# constants
#
SystemUniversal::VERSION = '2.6.4' unless SystemUniversal.send(:const_defined?, :VERSION)
def SystemUniversal.version() SystemUniversal::VERSION end
def version() SystemUniversal::VERSION end
def SystemUniversal.description
"universal capture of stdout and stderr and handling of child process pid for windows, *nix, etc."
end
#
# class methods
#
@host = Socket.gethostname
@ppid = Process.ppid
@pid = Process.pid
@turd = ENV['SYSTEMU_TURD']
c = begin; ::RbConfig::CONFIG; rescue NameError; ::Config::CONFIG; end
ruby = File.join(c['bindir'], c['ruby_install_name']) << c['EXEEXT']
@ruby = if system('%s -e 42' % ruby)
ruby
else
system('%s -e 42' % 'ruby') ? 'ruby' : warn('no ruby in PATH/CONFIG')
end
class << SystemUniversal
%w( host ppid pid ruby turd ).each{|a| attr_accessor a}
def quote(*words)
words.map{|word| word.inspect}.join(' ')
end
end
#
# instance methods
#
def initialize argv, opts = {}, &block
getopt = getopts opts
@argv = argv
@block = block
@stdin = getopt[ ['stdin', 'in', '0', 0] ]
@stdout = getopt[ ['stdout', 'out', '1', 1] ]
@stderr = getopt[ ['stderr', 'err', '2', 2] ]
@env = getopt[ 'env' ]
@cwd = getopt[ 'cwd' ]
@host = getopt[ 'host', self.class.host ]
@ppid = getopt[ 'ppid', self.class.ppid ]
@pid = getopt[ 'pid', self.class.pid ]
@ruby = getopt[ 'ruby', self.class.ruby ]
end
def systemu
tmpdir do |tmp|
c = child_setup tmp
status = nil
begin
thread = nil
quietly{
IO.popen "#{ quote(@ruby) } #{ quote(c['program']) }", 'rb+' do |pipe|
line = pipe.gets
case line
when %r/^pid: \d+$/
cid = Integer line[%r/\d+/]
else
begin
buf = pipe.read
buf = "#{ line }#{ buf }"
e = Marshal.load buf
raise unless Exception === e
raise e
rescue
raise "systemu: Error - process interrupted!\n#{ buf }\n"
end
end
thread = new_thread cid, @block if @block
pipe.read rescue nil
end
}
status = $?
ensure
if thread
begin
class << status
attr 'thread'
end
status.instance_eval{ @thread = thread }
rescue
42
end
end
end
if @stdout or @stderr
open(c['stdout'], 'rb'){|f| relay f => @stdout} if @stdout
open(c['stderr'], 'rb'){|f| relay f => @stderr} if @stderr
status
else
[status, open(c['stdout'], 'rb'){|f| f.read}, open(c['stderr'], 'rb'){|f| f.read}]
end
end
end
def quote *args, &block
SystemUniversal.quote(*args, &block)
end
def new_thread child_pid, block
q = Queue.new
Thread.new(child_pid) do |cid|
current = Thread.current
current.abort_on_exception = true
q.push current
block.call cid
end
q.pop
end
def child_setup tmp
stdin = File.expand_path(File.join(tmp, 'stdin'))
stdout = File.expand_path(File.join(tmp, 'stdout'))
stderr = File.expand_path(File.join(tmp, 'stderr'))
program = File.expand_path(File.join(tmp, 'program'))
config = File.expand_path(File.join(tmp, 'config'))
if @stdin
open(stdin, 'wb'){|f| relay @stdin => f}
else
FileUtils.touch stdin
end
FileUtils.touch stdout
FileUtils.touch stderr
c = {}
c['argv'] = @argv
c['env'] = @env
c['cwd'] = @cwd
c['stdin'] = stdin
c['stdout'] = stdout
c['stderr'] = stderr
c['program'] = program
open(config, 'wb'){|f| Marshal.dump(c, f)}
open(program, 'wb'){|f| f.write child_program(config)}
c
end
def quietly
v = $VERBOSE
$VERBOSE = nil
yield
ensure
$VERBOSE = v
end
def child_program config
<<-program
# encoding: utf-8
PIPE = STDOUT.dup
begin
config = Marshal.load(IO.read('#{ config }'))
argv = config['argv']
env = config['env']
cwd = config['cwd']
stdin = config['stdin']
stdout = config['stdout']
stderr = config['stderr']
Dir.chdir cwd if cwd
env.each{|k,v| ENV[k.to_s] = v.to_s} if env
STDIN.reopen stdin
STDOUT.reopen stdout
STDERR.reopen stderr
PIPE.puts "pid: \#{ Process.pid }"
PIPE.flush ### the process is ready yo!
PIPE.close
exec *argv
rescue Exception => e
PIPE.write Marshal.dump(e) rescue nil
exit 42
end
program
end
def relay srcdst
src, dst, _ = srcdst.to_a.first
if src.respond_to? 'read'
while((buffer = src.read(8192))); dst << buffer; end
else
if src.respond_to?(:each_line)
src.each_line{|buf| dst << buf}
else
src.each{|buf| dst << buf}
end
end
end
def slug_for(*args)
options = args.last.is_a?(Hash) ? args.pop : {}
join = (options[:join] || options['join'] || '_').to_s
string = args.flatten.compact.join(join)
words = string.to_s.scan(%r|[/\w]+|)
words.map!{|word| word.gsub %r|[^/0-9a-zA-Z_-]|, ''}
words.delete_if{|word| word.nil? or word.strip.empty?}
words.join(join).downcase.gsub('/', (join * 2))
end
def tmpdir d = Dir.tmpdir, max = 42, &b
i = -1 and loop{
i += 1
tmp = File.join(d, slug_for("systemu_#{ @host }_#{ @ppid }_#{ @pid }_#{ rand }_#{ i += 1 }"))
begin
Dir.mkdir tmp
rescue Errno::EEXIST
raise if i >= max
next
end
break(
if b
begin
b.call tmp
ensure
FileUtils.rm_rf tmp unless SystemU.turd
end
else
tmp
end
)
}
end
def getopts opts = {}
lambda do |*args|
keys, default, _ = args
catch(:opt) do
[keys].flatten.each do |key|
[key, key.to_s, key.to_s.intern].each do |k|
throw :opt, opts[k] if opts.has_key?(k)
end
end
default
end
end
end
end
# some monkeypatching for JRuby
if defined? JRUBY_VERSION
require 'jruby'
java_import org.jruby.RubyProcess
class SystemUniversal
def systemu
split_argv = JRuby::PathHelper.smart_split_command @argv
process = java.lang.Runtime.runtime.exec split_argv.to_java(:string)
stdout, stderr = [process.input_stream, process.error_stream].map do |stream|
StreamReader.new(stream)
end
exit_code = process.wait_for
field = process.get_class.get_declared_field("pid")
field.set_accessible(true)
pid = field.get(process)
[
RubyProcess::RubyStatus.new_process_status(JRuby.runtime, exit_code, pid),
stdout.join,
stderr.join
]
end
class StreamReader
def initialize(stream)
@data = ""
@thread = Thread.new do
reader = java.io.BufferedReader.new java.io.InputStreamReader.new(stream)
while line = reader.read_line
@data << line << "\n"
end
end
end
def join
@thread.join
@data
end
end
end
end
SystemU = SystemUniversal unless defined? SystemU
Systemu = SystemUniversal unless defined? Systemu
if $0 == __FILE__
#
# date
#
date = %q( ruby -e" t = Time.now; STDOUT.puts t; STDERR.puts t " )
status, stdout, stderr = systemu date
p [status, stdout, stderr]
status = systemu date, 1=>(stdout = '')
p [status, stdout]
status = systemu date, 2=>(stderr = '')
p [status, stderr]
#
# sleep
#
sleep = %q( ruby -e" p(sleep(1)) " )
status, stdout, stderr = systemu sleep
p [status, stdout, stderr]
sleep = %q( ruby -e" p(sleep(42)) " )
status, stdout, stderr = systemu(sleep){|cid| Process.kill 9, cid}
p [status, stdout, stderr]
#
# env
#
env = %q( ruby -e" p ENV['A'] " )
status, stdout, stderr = systemu env, :env => {'A' => 42}
p [status, stdout, stderr]
#
# cwd
#
env = %q( ruby -e" p Dir.pwd " )
status, stdout, stderr = systemu env, :cwd => Dir.tmpdir
p [status, stdout, stderr]
end
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