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per-version hints proposal

Currently, the setup.hint file is shared between all versions.

This means that manual intervention (by the package maintainer, or on sourceware) is needed when versions have different dependencies.

To automate this problem out of existence, I suggest replacing the setup.hint file in an upload with a package-version-release.hint file.

This will be basically identical to the existing setup.hint, with the advantage that it can't be trampled on by a future version, with the following changes:

* 'skip' doesn't seem meaningful on a per-version basis. Since it seems we can automatically detect packages which should have this applied anyhow (see the discussion in [1]), I'd suggest ignoring this hint, to be retired at some future date.

* 'curr', 'prev' and 'test' don't make sense on a per-version basis. So I suggest a separate file for these version overrides (versions.hint?)

cygport will be updated to create a pvr.hint rather than setup.hint

calm will be changed so that:

* The requires: line written in setup.ini will contain the union of the requires: from each pvr.hint

* The sdesc:, ldesc:, category: and message: lines in setup.ini will be taken from the pvr.hint for the curr version

* While it's already effectively mandatory that a package has a curr version, this requirement will be documented and enforced.

* The source: line in setup.ini for a package version will consider any external-source: from the corresponding pvr.hint

* Uploads with a setup.hint will continue to work as before, for a transitional period.

No setup changes are required.

Immediately, this avoids the need for manual intervention when versions have different dependencies, and going forward, this is lays some groundwork for supporting per-version dependencies.


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