Handle local gems from 'vendor/gems'

[rody]

Bundler fails when the app references local development gems (in vendor/gems)

Gemfile:

source 'https://rubygems.org'
ruby '2.2.3'
(...)
gem 'my_gem', path: 'vendor/gems/my_gem'

The error I get is:

The path `/app/user/vendor/gems/my_gem` does not exist.

The problem is due to 'bundle install' running before the Dockerfile gets a chance to copy this directory (because of the ONBUILD command)

[johanb]

I have the same problem with vendor/extension. All gems with path: specified fail to install.

[jmervine]

I solved this in local dev by adding entrypoint: ["bash","-c"] to my docker-compose.yml, however, I never run docker-compose build which is why it works. My work flow (for the first launch):

# after adding the entrypoint above to docker-compose.yml
local$ docker-compose run --rm web bash
container$ rm -rf .bundle
container$ bundle install --path .bundle
container$ bundle exec <whatever>