From: headius@...
Date: 2015-03-29T23:44:16+00:00
Subject: [ruby-core:68676] [Ruby trunk - Bug #11015] [Open] IO.copy_stream does not advance Tempfile destination

Issue #11015 has been reported by Charles Nutter.

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Bug #11015: IO.copy_stream does not advance Tempfile destination
https://bugs.ruby-lang.org/issues/11015

* Author: Charles Nutter
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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The following script, reported to JRuby in https://github.com/jruby/jruby/issues/2762, shows that MRI does not advance the position of a Tempfile when using copy_stream:

require "stringio"
require "tempfile"
file = Tempfile.new('foo')
IO.copy_stream(StringIO.new('foo'), file)
file.eof? #=> false (it's on the beginning)

Other types of streams leave the destination where it is after the copy, so I believe this is a bug.



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