[Rpm-maint] [rpm-software-management/rpm] Add a man page for RPM dependency generators (PR #3957)

[Michal Domonkos]

@dmnks commented on this pull request.



> +*%\_\_provides_exclude* _REGEX_++
+*%\_\_provides_exclude_from* _REGEX_
+
+# DESCRIPTION
+
+RPM uses a pluggable interface coupled with a file classifier to add dependency
+information to packages at build time. This system relies on specialized, domain
+specific executables, called _generators_, that do the heavy-lifting of figuring
+out the dependencies from the files present in the buildroot. It complements the
+manual tags, such as *Requires* or *Provides*, in *rpm-spec*(5) files.
+
+Generators are paired with logical labels, called _file attributes_, assigned to
+the packaged files by the file classifier. This ensures that every file is only
+processed by the applicable generator(s), as opposed to all generators, which
+simplifies their implementation and significantly improves the overall build
+performance.

That's a good point. I felt the need to explain the *why* of file attributes since they technically aren't needed (they are just an optimization technique) and one might wonder what a file classifier has to do with all this. But then, you're also right - man pages aren't supposed to be text books, they're just that, manuals. Dry and to the point. So yep, will drop that.

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