[Rpm-maint] [rpm-software-management/rpm] Add support for generating buildinfo file as subpackage (#1532)

[Wojtek Porczyk]

@woju commented on this pull request.



> +Format: 1.0-rpm
+Build-Architecture: $(uname -m)
+Source: $RPM_PACKAGE_NAME
+Epoch: $RPM_PACKAGE_EPOCH
+Version: ${RPM_PACKAGE_VERSION}
+Release: ${RPM_PACKAGE_RELEASE}
+Architecture: $RPM_ARCH
+Build-Origin: $(getos)
+Build-Path: $RPM_BUILD_DIR

> You're defining an rpm-based format.

This is actually a debian-defined format[^1] and at the time we was mocking this format[^2] we thought it would be good to maintain compatibility, because we expect much of the tooling will be shared. Obviously things like package version specification will be RPM-specific (hence `-rpm` in `Format:`), but the rest, like exchange, signature verification, comparison etc. does not need to be different. So the original intention is to maintain as close format to the original as possible.

[^1]: https://wiki.debian.org/ReproducibleBuilds/BuildinfoFiles, https://manpages.debian.org/bullseye/dpkg-dev/deb-buildinfo.5.en.html
[^2]: https://github.com/woju/rpmbuildinfo during [Reproducible Builds Summit 2016](https://reproducible-builds.org/events/berlin2016/)

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