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

[Igor Gnatenko]

Imagine that the package you are building, contains following binary packages:

* util-linux (depends on libsmartcols.so.1)
* libsmartcols (provides libsmartcols.so.1)

I believe in 99.(9)% of cases you really want to have libsmartcols installed as a provider and not something else what happen to provide libsmartcols.so.1.

In Fedora Packaging Guidelines is written: if this happens, you must also add `Requires: libsmartcols%{?_isa} = EVR`.

The idea is that if one of the dependency is provided by any other package generated by this source package, then it would be replaced by reference to a package with exact EVR.

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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.

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