Hi Ken,
Dne 19.4.2012 03:43, Ken Dreyer napsal(a):
I have two more Ruby newbie questions :)
I see a lot of Gems contain a "Gemfile.lock" file. From looking at the
conventions in Fedora's packages, it's a good idea to not include the
Gemfile.lock in RPMs. I'm trying to understand how Gemfile.lock
relates to packaging.
General question: Is Gemfile.lock only intended to be a convenience
for Ruby Gem developers? I thought Gemfile.lock was only for
development, but it seems like its contents can also affect an
application's runtime...?
Regarding the Gemfile.lock, I would suggest you to read [1].
Otherwise, there is not straight forward answer. Rails applications
definitely uses Bundler, which by default reads the Gemfile.lock. For
other applications, it depends. My suggestion is not to hardly depend on
Bundler, i.e. do not use "require 'bundler/setup'" or similar in your
app. You can always run "bundle exec yourapp" instead.
Packaging question: In preparation for packaging up Gitorious, I've
found that I need to delete some entries from Gemfile.lock in order to
use alternate Gem versions. Is it always safe to override the version
numbers in Gemfile.lock like this?
I would suggest to remove Bundler dependency at all. Bundler will always
use/create the Gemfile.lock. If you provide it by yourself and some
component will get updated, the application fail. If you don't provide
it, the application will try to create it but this will (at least should
;) fail, due to limited rights. The version resolution which Bundler
provides is not needed, since the dependencies are determined by RPM
(and occasionally they may differ from original dependencies in
upstream). The only thing you will miss without Bundler is initialized
and restricted environment, e.g. at the start of the application,
Bundler reads the Gemfile.lock and place immediately all the gems into
Ruby's load path and there is not possible to load other gem from your
application in the future.
I hope that somebody from Aeolus will chime in with their experience
with Bundler and how they use it.
Note that there was already some discussion about Bundler and packaging
guidelines [2], but at the end, we did not found sound statement how to
handle it correctly. So if you succeed with Gitorius, your solution
might become standard ;)
Vit
[1]
http://yehudakatz.com/2011/05/30/gem-versioning-and-bundler-doing-it-right/
[2]
http://lists.fedoraproject.org/pipermail/ruby-sig/2012-January/000759.html
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