Issue #8004 has been updated by Josh Cheek.


On my computer, the reason for this is:

It should have found the path here: https://github.com/ruby/ruby/blob/c7e99cbfc8dea00ffa5d0a286ea484e90e789df4/process.c#L2193

But notice the second argument, 0, which causes `dln_find_exe_r` to look at the environment variables to get the `PATH`, and thus the PATH that is set in `eargp` is not used.

----------------------------------------
Bug #8004: Open3 not finding binaries when PATH env var is passed as first arg
https://bugs.ruby-lang.org/issues/8004#change-61172

* Author: Josh Cheek
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin12.2.0]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
=begin
 #!/bin/sh
 
 # make an executable
   echo '#!/usr/bin/env ruby' >  my_bin
   echo 'puts "omg"'          >> my_bin
   chmod +x my_bin
 
 
 # run it in 1.9
   ruby1.9 -v
     # >> ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin12.2.0]
 
   ruby1.9 -r open3 -e 'p Open3.capture3({"PATH" => ".:#{ENV["PATH"]}"}, "my_bin")'
     # >> ["omg\n", "", #<Process::Status: pid 30556 exit 0>]
 
 # run it in 2.0
   ruby2 -v
     # >> ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin12.2.0]
 
   ruby2 -r open3 -e 'p Open3.capture3({"PATH" => ".:#{ENV["PATH"]}"}, "my_bin")'
     # >> /Users/joshcheek/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/open3.rb:211:in `spawn': No such file or directory - my_bin (Errno::ENOENT)
     # >>   from /Users/joshcheek/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/open3.rb:211:in `popen_run'
     # >>   from /Users/joshcheek/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/open3.rb:99:in `popen3'
     # >>   from /Users/joshcheek/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/open3.rb:279:in `capture3'
     # >>   from -e:1:in `<main>'
 
   # the above fails, but this one works
   ruby2 -r open3 -e 'ENV["PATH"] = ".:#{ENV["PATH"]}"; p Open3.capture3("my_bin")'
     # >> ["omg\n", "", #<Process::Status: pid 30556 exit 0>]
 
   # it is setting the path, though, so idk what the problem is
   ruby2 -r open3 -e 'p Open3.capture3({"PATH" => ".:#{ENV["PATH"]}"}, "echo $PATH")'
     # >> [".:/Users/joshcheek/.rbenv/shims: ...
=end



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