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Semantic Versioning (and Pessimistic Versioning Constraint) notice

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I noticed some projects using Fog are setting very specific versioning constraint.  For example, https://github.com/mitchellh/vagrant-rackspace/issues/34 happened because both vagrant-aws and vagrant-rackspace are using 3 digits of precision.

The fog RELEASE.md says that Fog follows semantic versioning.  Several other projects have put up notices suggesting to use 2 digits of precision for projects that follow semver.  See https://github.com/intridea/multi_json, for example.

I added a similar notice, but softened the language because I don't think there is a clear understanding on what semantic versioning means for a project like Fog, which has multiple providers backed by services that are all evolving at their own pace.
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Max Lincoln 2013-10-22 18:49:45 -02:00
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@ -135,6 +135,31 @@ for more details and examples. Once you are ready to start scripting fog, here i
geemus says: "That should give you everything you need to get started, but let me know if there is anything I can do to help!"
## Versioning
Fog library aims to adhere to [Semantic Versioning 2.0.0][semver], although it does not
address challenges of multi-provider libraries. Semantic versioning is only guaranteed for
the common API, not any provider-specific extensions. You may also need to update your
configuration from time to time (even between Fog releases) as providers update or deprecate
services.
However, we still aim for forwards compatibility within Fog major versions. As a result of this policy, you can (and
should) specify a dependency on this gem using the [Pessimistic Version
Constraint][pvc] with two digits of precision. For example:
```ruby
spec.add_dependency 'fog', '~> 1.0'
```
This means your project is compatible with Fog 1.0 up until 2.0. You can also set a higher minimum version:
```ruby
spec.add_dependency 'fog', '~> 1.16'
```
[semver]: http://semver.org/
[pvc]: http://guides.rubygems.org/patterns/
## Contributing
* Find something you would like to work on.