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https://issues.apache.org/jira/browse/MNG-6654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elliotte Rusty Harold closed MNG-6654.
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> Resolve version ranges to the lower inclusive bound
> ---------------------------------------------------
>
> Key: MNG-6654
> URL: https://issues.apache.org/jira/browse/MNG-6654
> Project: Maven
> Issue Type: New Feature
> Components: Dependencies
> Affects Versions: 3.6.0
> Reporter: Koritako Alana
> Priority: Major
>
> Version ranges result in non-repeatable builds because, and only because,
> Maven chooses the greatest version within the range.
> If we instead choose the lower inclusive bound of the range, then the build
> will always be the same.
> eg. [1.2.0,2.0.0.min)
> Resolving to lower inclusive bound means taking 1.2.0 here. Always. Even
> after 1.3.0 is released.
> Taking the lower inclusive bound means there are no holes that can later be
> filled in, resulting in non-repeatable builds. eg. If we took the lowest
> existing version in the range, then there would be a possibility of someone
> later adding a lower version. Taking the lower inclusive bound requires the
> lower inclusive bound to exist from day 1.
> Version ranges are actually for defining compatibility ranges. Conceptually,
> there are 2 version numbers: the version you compile against and the version
> range your code is compatible with. Even if you declare a version range,
> javac only ever compiles against 1 specific version.
> For repeatable builds, you want the version number you compile against to be
> the same. However, you also want to be able to declare a range of dependency
> versions with which your library is compatible. As Maven is now, you can't
> have both. By resolving version ranges to the lower inclusive bound, we can.
> This should be obvious, but to be clear: If I am writing a library liba which
> depends on library libb with range [1.2.0,2.0.0.min) and someone writes an
> app including my library liba, then the app should get version 1.2.0 of libb.
> The app is free to declare a direct dependency on version 1.3.0 or 1.8.5 etc
> of libb, any version that falls into the range [1.2.0,2.0.0.min). If the app
> declares a direct dependency on version 2.2.0 of libb, Maven should report a
> dependency resolution error like it currently does.
> But not all version ranges have a lower inclusive bound? Well, maybe they
> should. I honestly cant figure out a valid use for an exclusive lower bound -
> maybe for the lack of my imagination. Either way, I don't imagine that it
> would be possible to convince Maven devs to change existing behavior, so this
> should probably be implemented in a new version range spec scheme. ie. New
> version range type with new syntax that always has lower inclusive bound and
> always resolves to lower inclusive bound.
> Without this, I am forced to accept either non-reproducible builds or to give
> up strict dependency convergence assistance from Maven.
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