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CPackDeb: Use `CPACK_PACKAGE_DESCRIPTION_FILE`

Alex Turbov requested to merge zaufi/cmake:feature/CPackDeb-use-CPACK_PACKAGE_DESCRIPTION_FILE into master

Rationale

My initial problem was caused by the inability to set the package description in a generic way. E.g, I have a project which produces RPM and/or DEB packages. Setting the only CPACK_COMPONENT_<COMPONENT>_DESCRIPTION is not possible: Debian Policy Manual require to format it properly (not needed for RPM). Unfortunately, there is CPACK_RPM_<component>_PACKAGE_DESCRIPTION, but no corresponding CPACK_DEB_<component>_PACKAGE_DESCRIPTION, so I can't assign the "Deb-only" description. Nowadays, the only way is to assign per-generator (if supported) description (and per-component) and format the generic description according to Debian rules... which is IMO not really nice way.

What has been done

Setting the Deb package description code was rewritten:

  • introduced CPACK_DEBIAN_<COMPONENT>_DESCRIPTION w/ fallback CPACK_COMPONENT_<COMPONENT>_DESCRIPTION
  • if none of above have set, try to read the description from CPACK_PACKAGE_DESCRIPTION_FILE (that was missed in CPackDeb) to CPACK_DEBIAN_PACKAGE_DESCRIPTION
  • the CPACK_PACKAGE_DESCRIPTION_SUMMARY could be used as the description (if still not set) or prepended to the description text as supposed by the Debian Policy Manual
  • report error if still no description (w/ the text as it was before)
  • format the obtained description according to the guidelines
  • the code was refactored to use modern CMake commands (the commits before adding the new features)

Topic-rename: cpack-DEB-use-CPACK_PACKAGE_DESCRIPTION_FILE

Edited by Alex Turbov

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