It was supposed to fix shelling out to Ruby but it in fact broke another
kind of shelling out to Ruby: invoking the `ruby` binary directly with
the `-S` flag.
Fixes#480
This reverts commit db143bb654.
Enables shelling out from a ruby process started with rbenv to a ruby
process with a different RBENV_VERSION. Fixes#121
This removes the workaround created for #15 and solves `ruby -S` support
by setting RUBYPATH. PATH is never changed.
To illustrate how RUBYPATH changes in various configurations:
PATH=~/bin:~/.rbenv/shims:/usr/bin:/bin
RBENV_VERSION=1.8 ruby -S rake
#=> executes ~/.rbenv/versions/1.8/bin/rake
#=> RUBYPATH=~/bin:~/.rbenv/versions/1.8/bin:/usr/bin:/bin
RBENV_VERSION=2.0 ruby -S rake
#=> executes ~/.rbenv/versions/2.0/bin/rake
#=> RUBYPATH=~/bin:~/.rbenv/versions/2.0/bin:/usr/bin:/bin
RBENV_VERSION=system ruby -S rake
#=> executes /usr/bin/rake
#=> RUBYPATH=~/bin:/rbenv_shims_were_here:/usr/bin:/bin
RBENV_VERSION=1.8 ruby -S rake
#=> executes ~/.rbenv/versions/1.8/bin/rake
#=> RUBYPATH=~/bin:~/.rbenv/versions/1.8/bin:/usr/bin:/bin
System ruby is already on PATH (that's the definition of system ruby) and by
duplicating its path by putting it in front, we can break the user's
environment.
Fixes#275
