问题
Usually, people will use bundle install to install gems. But it require Gemfile and Gemfile.lock(optional).
My situation is a little different. I only have Gemfile.lock. So how can I install all these gems based on bundle command.
I tried bundle install --deployment. But I got Could not locate Gemfile error.
OK. I asked this question in bundler github issues. Their member gave me a good answer: https://github.com/bundler/bundler/issues/5293#issuecomment-269978731
For summary -- I CAN NOT DO THAT
I gave up to run bundle install with Gemfile.lock only. But I still need to solve my problem. And in my Gemfile, I don't have any special options like groups, platforms, install conditionals. So I wrote a script(gem) to revert the Gemfile.lock to Gemfile for my docker image.
[SOLVED]
回答1:
You can use deployment mode of a bundler.
回答2:
With only gemfile.lock, you can run
bundle install --deployment
The only catch is that this command installs gems to the vendor/bundle instead of your normal gem bundle path. it is so because it is expected to be used only in production.
It works well all the same though.
回答3:
Have you tried simply running the gem install directly in your terminal? That way you won't need to use a Gemfile at all.
For example, with the devise gem, you can just run $ gem install devise in your terminal and that will install the devise gem without adding it to your Gemfile.
来源：https://stackoverflow.com/questions/41359249/how-to-install-gems-based-on-gemfile-lock-without-gemfile