It is increasingly hard to maintain default gems extracted from StdLib
into gems. If they are overlapped by independent versions, it is even
harder, because the overlapped versions would need to provide symlinks
back to StdLib \[[1]\]. On top of that, the layout differs from
upstream, where default gems are always available.
Because these small nuances can make hard discoverable race conditions
during Ruby application loading and runtime, it will be best to keep the
default gems bundled.
[1]: https://src.fedoraproject.org/rpms/rubygem-racc/pull-request/1
This is needed to compile zlib support. I think it is by accident available in the original buildroot, but not in mine.
I think it is better to explicitly name it.
During update, RPM cannot simply replace directory by link to direcotry,
therefore create the directory structure and link the files there one by
one (rhbz#1691039).
This avoids issues running `$ bin/rails console --sandbox`, which
otherwise breaks with error such as:
~~~
$ bin/rails console --sandbox
Traceback (most recent call last):
12: from bin/rails:4:in `<main>'
11: from bin/rails:4:in `require'
10: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/commands.rb:18:in `<top (required)>'
9: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command.rb:44:in `invoke'
8: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command.rb:70:in `find_by_namespace'
7: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command/behavior.rb:79:in `lookup'
6: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command/behavior.rb:79:in `each'
5: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command/behavior.rb:80:in `block in lookup'
4: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command/behavior.rb:80:in `each'
3: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command/behavior.rb:84:in `block (2 levels) in lookup'
2: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/command/behavior.rb:84:in `require'
1: from /builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/commands/console/console_command.rb:3:in `<top (required)>'
/builddir/.gem/ruby/gems/railties-5.2.2.1/lib/rails/commands/console/console_command.rb:3:in `require': cannot load such file -- irb (LoadError)
~~~
