[#43120] [ruby-trunk - Bug #6124][Open] What is the purpose of "fake" gems in Ruby — Vit Ondruch <v.ondruch@...>

27 messages 2012/03/07

[#43142] Questions about thread performance (with benchmark included) — Rodrigo Rosenfeld Rosas <rr.rosas@...>

A while ago I've written an article entitled "How Nokogiri and JRuby

10 messages 2012/03/08

[#43148] [ruby-trunk - Feature #6126][Open] Introduce yes/no constants aliases for true/false — Egor Homakov <homakov@...>

16 messages 2012/03/09

[#43238] [ruby-trunk - Feature #6130][Open] inspect using to_s is pain — Thomas Sawyer <transfire@...>

21 messages 2012/03/11

[#43313] [ruby-trunk - Feature #6150][Open] add Enumerable#grep_v — Suraj Kurapati <sunaku@...>

17 messages 2012/03/15

[#43325] [ruby-trunk - Bug #6154][Open] Eliminate extending WaitReadable/Writable at runtime — Charles Nutter <headius@...>

25 messages 2012/03/16

[#43334] [ruby-trunk - Bug #6155][Open] Enumerable::Lazy#flat_map raises an exception when an element does not respond to #each — Dan Kubb <dan.kubb@...>

9 messages 2012/03/16

[#43370] [ruby-trunk - Feature #6166][Open] Enumerator::Lazy#pinch — Thomas Sawyer <transfire@...>

15 messages 2012/03/17

[#43373] [ruby-trunk - Bug #6168][Open] Segfault in OpenSSL bindings — Nguma Abojo <git.email.address@...>

14 messages 2012/03/17

[#43454] [ruby-trunk - Bug #6174][Open] Fix collision of ConditionVariable#wait timeout and #signal (+ other cosmetic changes) — "funny_falcon (Yura Sokolov)" <funny.falcon@...>

10 messages 2012/03/18

[#43497] [ruby-trunk - Bug #6179][Open] File::pos broken in Windows 1.9.3p125 — "jmthomas (Jason Thomas)" <jmthomas@...>

24 messages 2012/03/20

[#43502] [ruby-trunk - Feature #6180][Open] to_b for converting objects to a boolean value — "AaronLasseigne (Aaron Lasseigne)" <aaron.lasseigne@...>

17 messages 2012/03/20

[#43529] [ruby-trunk - Bug #6183][Open] Enumerator::Lazy performance issue — "gregolsen (Innokenty Mikhailov)" <anotheroneman@...>

36 messages 2012/03/21

[#43543] [ruby-trunk - Bug #6184][Open] [BUG] Segmentation fault ruby 1.9.3p165 (2012-03-18 revision 35078) [x86_64-darwin11.3.0] — "Gebor (Pierre-Henry Frohring)" <frohring.pierrehenry@...>

8 messages 2012/03/21

[#43672] [ruby-trunk - Feature #6201][Open] do_something then return :special_case (include "then" operator) — "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>

12 messages 2012/03/26

[#43678] [ruby-trunk - Bug #6203][Open] Array#values_at does not handle ranges with end index past the end of the array — "ferrous26 (Mark Rada)" <markrada26@...>

15 messages 2012/03/26

[#43794] [ruby-trunk - Feature #6216][Open] SystemStackError backtraces should not be reduced to one line — "postmodern (Hal Brodigan)" <postmodern.mod3@...>

15 messages 2012/03/28

[#43814] [ruby-trunk - Feature #6219][Open] Return value of Hash#store — "MartinBosslet (Martin Bosslet)" <Martin.Bosslet@...>

20 messages 2012/03/28

[#43858] [ruby-trunk - Feature #6222][Open] Use ++ to connect statements — "gcao (Guoliang Cao)" <gcao99@...>

12 messages 2012/03/29

[#43904] [ruby-trunk - Feature #6225][Open] Hash#+ — "trans (Thomas Sawyer)" <transfire@...>

36 messages 2012/03/29

[#43951] [ruby-trunk - Bug #6228][Open] [mingw] Errno::EBADF in ruby/test_io.rb on ruby_1_9_3 — "jonforums (Jon Forums)" <redmine@...>

28 messages 2012/03/30

[#43996] [ruby-trunk - Bug #6236][Open] WEBrick::HTTPServer swallows Exception — "regularfry (Alex Young)" <alex@...>

13 messages 2012/03/31

[ruby-core:43611] [ruby-trunk - Feature #4265][Assigned] Provide a core method Kernel#ruby for invoking a new Ruby instance

From: "mame (Yusuke Endoh)" <mame@...>
Date: 2012-03-25 05:55:35 UTC
List: ruby-core #43611
Issue #4265 has been updated by mame (Yusuke Endoh).

Description updated
Status changed from Open to Assigned
Assignee set to matz (Yukihiro Matsumoto)


----------------------------------------
Feature #4265: Provide a core method Kernel#ruby for invoking a new Ruby instance
https://bugs.ruby-lang.org/issues/4265#change-25108

Author: headius (Charles Nutter)
Status: Assigned
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: 


=begin
 Many libraries re-launch Ruby to perform additional tasks. Sometimes this is done for process isolation, sometimes it's to change startup command-line for a subset of work, and sometimes it's just the easiest way to launch a clean Ruby environment. In almost every case, the command line is built using "ruby" explicitly as the command to be executed. This only works if the Ruby version/implementation you want to run is installed as "ruby" and exists on PATH. If, for example, you are running JRuby, you most likely want the subprocess to launch a new JRuby instance. I propose that we add a standard way to launch a new Ruby instance to Kernel.
 
 Kernel#ruby would launch, in an implementation-specific way, a new instance of the *current* Ruby. On normal C Ruby, this would simply use the full path to the executing "ruby" binary (using appropriate name, like "/usr/bin/ruby1.9" if necessary) and launch it directly, given the specified parameters. On implementations like JRuby, which can launch many instances in the same JVM, the Kernel#ruby method could simple launch a new instance of JRuby. In both cases, it would avoid problems with expecting libraries to build their own command line (and usually getting it wrong).
 
 The method would take, at minimum, a set of command-line parameters to the new instance. These could be in the form of an array of strings, a set of string parameters, or a single string parameter (I don't know which is best). There may be a need for non-command-line options to the #ruby method, so the array or single string might be best (for example, an option to specify whether to attempt to keep the launch in-process, using some form of MVM)
 
 The method would launch Ruby with the given command-line parameters in some implementation-specific way.
 
 The method could either return streams and pid, like p/open/3/4, or simply return the subprocess's output. There could also be a separate #ruby_open to do popen-like stream-driving.
 
 The method should be backported to 1.8.7, ideally, so that libraries could freely start to use it as soon as possible.
 
 Example usages:
 
 ruby "-e 'puts 1'"
 in, out, err = ruby "-EUTF-8", mvm:true
=end



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