[TxMt] Re: TextMate 1.5 and Ruby 2.0.0

[Matt Neuburg]

Allan Odgaard <mailinglist at textmate.org>
wrote:

> On Mar 8, 2013, at 3:59, Matt Neuburg wrote:
> 
> > Allan Odgaard wrote:
> > 
> >> Did you run the above with Ruby 2.0?
> > 
> > Sure, and it outputs "test", but I really don't quite see what it has to
> > with what I asked.
> 
> It is testing if the core functionality that TextMate.executor relies on
> is available and works in ruby 2.0.
> 
> > In Ruby 2.0 (but not in Ruby 1.8.7 or Ruby 1.9.3) we are failing on
> > the "for_fd" line. The question is what to do about that.
> 
> Figure out which assumption 2.0 breaks, which is what I was trying to do
> by having you run the code that tests our core assumptions (creating a
> pipe and getting the write-end by creating a file descriptor from its
> integer representation).
> 
> > Could it be that the TM_ERROR_FD pipe created in executor.rb is
> somehow not surviving? Is it being closed too soon somehow?
> 
> It does look like it is being closed, though _nothing_ in the user script
> should close this file descriptor, so the most likely explanation would
> be, that ruby 2.0 closes all open file descriptors (except 0-2) and
> _before_ handling at_exit code.
> 
> I find this a little weird though, if they are actually doing that -
> should be possible to test though.

Okay, thanks for the clue; following that up, I was able to discover
this: system() and exec() and spawn() and IO.popen() in ruby 2.0
apparently close non-standard file descriptors by default (that is to
say, everything except 0, 1, and 2). It may be that this can be
prevented by passing :close_others=>false (which can itself be
overridden by setting the fd's close-on-exec flag).

We are now well out of my depth. :) But it does seem to me that this has
something to do with the case (though I do not know exactly what), since
it is raising exactly the sort of red flag of incompatibility that we're
looking for.

More info at http://ruby-doc.org/core-2.0/Kernel.html with heavy details
particularly under "spawn".

Let me know if there's something you want me to try! Thx - m.


-- 
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