RFE: Disallow duplicate tags in headers

[DemiMarie]

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.

[pmatilai]

Yeah it's always been permitted, and it does seem bizarre, maybe there once was some use-cases depending on the behavior.

[DemiMarie]

Is rejecting all dribbles in packages + requiring all headers in packages to be sorted an option? That would make checking for duplicates trivial, by requiring that each entry have a strictly greater tag than the one preceding it.