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

[Panu Matilainen]

@pmatilai commented on this pull request.



> +	This is the recommended protocol for newly written generators.
+
+	Added: 4.20.0
+
+By default, the *simple* protocol is used. To enable the *multifile* protocol
+for all generators of the file attribute _NAME_, define the following macro:
+
+	*%\_\_*_NAME_*_protocol multifile*
+
+Unlike the path _REGEX_ in file attributes, generators receive filenames with
+the *%{buildroot}* prefix so that they can access the actual file contents on
+disk.
+
+Due to backwards compatibility, generators must always consume all of stdin and
+not make any assumptions about the number of files passed, regardless of the
+protocol used.

The stdin consumption is part of the protocol though, not just backwards compatibility. I'd change this to:

Generators must always consume all of stdin. For backwards compatibility, generators should not make any assumptions about the number of files passed, regardless of the protocol used.

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