[OE-core] [PATCH 11/11] package.bbclass: Restore functionality to detect RPM dependencies

[Alexander Kanavin]

On 06/15/2017 04:53 PM, Peter Kjellerstedt wrote:
> During the transition to dnf and rpm4, the functionality to
> automatically make RPM determine dependencies was lost.
>
> Before the transition, an OE specific tool called rpmdeps-oecore had
> been added to the rpm suit. It was based on the rpmdeps tool that is
> part of rpm. For each file specified on its command line, it would
> output the provides and requires that RPM could determine.
>
> During the transition to rpm4, rpmdeps-oecore was replaced with the
> standard rpmdeps. However, what no one noticed was that unless rpmdeps
> is given options, e.g., -P or -R, to tell it what it should output, it
> will not output anything. Thus, it would do all the work to determine
> the requirements, but would keep silent about it. And since no output
> from rpmdeps is expected unless there are requirements, there were no
> warnings indicating that everything was not working as expected.
>
> Porting the old rpmdeps-oecore to work with rpm4 is not really
> possible since it relied on being able to access internals of RPM that
> are no longer available. However, it turned out that rpmdeps had a
> debug option, --rpmfcdebug, that would output exactly the information
> that we need, albeit in a different format and to stderr. To make this
> usable, rpmdeps has now received a new option, --alldeps, which sends
> the information we need to stdout.

I'd like you to address my previous comment: how do you ensure this will 
continue to work going forward? Is it taken into use by default, and if 
it breaks, will we notice?

Alex