bundler/inline fails to install missing gems if Gemfile exists in working dir

[mattbrictson]

If I am in directory that contains Gemfile and Gemfile.lock, running a bundler/inline script does not work as I expect.

Expected behavior

Any missing gems in the inline gem declaration will be installed.

Actual behavior

Bundler::GemNotFound is raised.

Tested with

Bundler 1.13.6
Ruby 2.3.1
RubyGems 2.6.7

---

$ cat Gemfile
source "https://rubygems.org"
gem "rake"

$ cat test.rb
#!/usr/bin/env ruby
require "bundler/inline"
gemfile do
  source "https://rubygems.org"
  gem "whirly"
end
puts "Done"

$ bundle install
$ ruby test.rb
/Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/resolver.rb:366:in `block in verify_gemfile_dependencies_are_found!': Could not find gem 'whirly' in any of the gem sources listed in your Gemfile or available on this machine. (Bundler::GemNotFound)
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/resolver.rb:341:in `each'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/resolver.rb:341:in `verify_gemfile_dependencies_are_found!'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/resolver.rb:199:in `start'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/resolver.rb:181:in `resolve'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/definition.rb:250:in `resolve'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/definition.rb:174:in `specs'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/installer.rb:171:in `ensure_specs_are_compatible!'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/installer.rb:79:in `run'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/installer.rb:24:in `install'
    from /Users/mbrictson/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.13.6/lib/bundler/inline.rb:63:in `gemfile'
    from test.rb:3:in `<main>'

Removing the lock file from the working directory fixes the problem:

$ rm Gemfile.lock
$ ruby test.rb
Done