[Rpm-maint] [rpm-software-management/rpm] Mangle inter-package dependencies (#627)

[wladmis]

> This has been implemented in ALT here: http://git.altlinux.org/gears/r/rpm-build.git?p=rpm-build.git;a=blob_plain;f=build/interdep.c;hb=HEAD. That code does different things and hard to read, but that is where we can steal some ideas.

In that part of code the following happens (A, B and C are subpackages of one package):

- strong intersubpackage dependencies are automatically generated  (if A requires foo, and B provides foo, then a strong dependency on B is added to A);
- redundant dependencies are optimized away (if A requires B and foo, and B provides foo, the foo requirement is optimized away from A);
- strong transitive dependencies are optimized away (if A requires B and C, and B requires C, then C dependency is optimized away from A).

The benefit of these is simplifying of manual maintainer work and reducing the size of package headers and, as a result, repo indices.

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