[ruby-core:111045] [Ruby master Feature#13847] Gem activated problem for default gems

Issue #13847 has been updated by hsbt (Hiroshi SHIBATA).

Assignee set to hsbt (Hiroshi SHIBATA)

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Feature #13847: Gem activated problem for default gems
https://bugs.ruby-lang.org/issues/13847#change-100299

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Priority: Normal
* Assignee: hsbt (Hiroshi SHIBATA)
----------------------------------------
If you try to use some default gems with a fixed version using Bundler, there are cases where the current RubyGems/Bundler/Ruby specification can not be used with the version specified by the user.

For example

```
$ ruby -v
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin17]
$ gem list | grep openssl
openssl (2.0.5, 2.0.4, default: 2.0.3)
```

In the environment such as ```require 'openssl'```, the version that is activated when openssl is searched with openssl is the version found first, ie 2.0.5.

```
$ ruby -ropenssl -e 'p OpenSSL::VERSION'
"2.0.5"
```

At this time, for example, suppose the user really wants to use openssl 2.0.4 and wrote the following Gemfile.

```
> cat Gemfile
# frozen_string_literal: true
source "https://rubygems.org"

gem 'openssl', '2.0.4'
```

Unfortunately, since rubygems has required openssl before the bundler runs it will result in an activated error like this:

```
> bundle exec ruby -ropenssl -e 'p OpenSSL::VERSION'
/path/to/2.4.1/lib/ruby/gems/2.4.0/gems/bundler-1.15.4/lib/bundler/runtime.rb:317:in `check_for_activated_spec!': You have already activated openssl 2.0.5, but your Gemfile requires openssl 2.0.4. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)
```

This problem can be avoided by bundling it as a vendoring library under bundler's repository if it is a default gem implemented with pure ruby.

Https://github.com/bundler/bundler/blob/master/lib/bundler/vendor/fileutils/lib/fileutils.rb

In the case of bundler, by separating the namespace as `Bundler::FileUtils`, even the version specified by the user is made available without conflict at the time of activate. However, this method can not be used with C extension library.

Since we want to use json/psych from the bundler team with rubygems/bundler to serialize data, we need about whether we can implement a way to avoid some kind of C extension on Ruby itself.

I discussed with @indirect who is maintainer of RubyGems/Bundler. We can resolve this problem like following feature of ruby.

```
require_for_bundler 'json', '2.0.2'
```

When we declared above `require_for_bundler`, We put a json-2.0.2 to placed in a namespace like `Bundler::JSON`. There were similar issues in the past as well.

https://bugs.ruby-lang.org/issues/10320

I think that the way of writing ```require 'json', version: '2.0.2', into: :Bundler``` which extended the method like this issue seems like that. Also, in this use case, it seems to be enough to use ```require 'json', version: :default, into: :Bundler``` which forces the use of default gem.

Matz, How do you think about this feature?



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