[Rpm-maint] [rpm-software-management/rpm] Disallow duplicate entries in packages (Issue #1905)

[Demi Marie Obenour]

If I understand RPM’s source code correctly, it is possible for the same header tag to appear more than once in a package.  This makes little sense and should not be allowed.  I propose that RPM reject packages where the same tag appears more than once in the same header.

One way to achieve this is to do the following when loading a package from a file, as opposed to a header from the RPMDB:

- For each entry in the dribble, call findEntry() on the immutable region, and return an error if it finds something.
- After sorting the entries in the immutable region, check if there are two consecutive entries with the same tag.  If so, error out.

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