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enthought / sat-solver

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Add "provides" package metadata. #194

Closed johntyree closed 8 years ago

johntyree commented 8 years ago

This adds PackageMetadata.provides and the associated code around that. It works by dumping all of the providers of a given name into pool's the internal name_to_packages list. The rest of the behavior falls out from that.

If package A provides package B, then either A or B can be used to satisfy dependencies (or cause conflicts with) B. This does imply that package A replaces package B or that package B is somehow obsolete or that package A should be preferred. With the current implementation, if two packages provide the same thing then you'll get whichever has a higher version number, but this is unspecified. If you care about priority, you'll need to use some of the other metadata features (not yet implemented).

See https://github.com/enthought/sat-solver/issues/177

noraderam commented 8 years ago

Just a few questions

johntyree commented 8 years ago

@noraderam :mailbox_with_mail:

noraderam commented 8 years ago

LGTM