[Rpm-maint] [rpm-software-management/rpm] RFE: make %{load: } work in %prep (#571)

[nim-nim]

Thanks a lot Panu, it like it a lot better than the shell script option!

Unfortunately I've just seen another similar package wants to use the info in the shipped macros to `ExclusiveArch` itself so that rules out using a `%prep` method.

I may end up replacing all this by sed-ing things in macro files from spec definitions, like fedora-release does, which kind of sucks since the result is not too readable and puts the master definition in the spec file not the scm-managed macro project.

Though I guess it should be possible to write a macro that automates such kind of sed-ing. fedora-release could use it. As does fontpackages. As does go-macros. And there are probably others I have no knowledge of.

@pmatilai do you think a macro
 * that takes as first argument a rpm constant or function defined in the spec,
 * that takes as second argument a macro filename available somewhere in _builddir during %prep
 * and puts the spec definition of the rpm constant or function in the macro file
 * eventually replacing exisiting defs in this file
Is doable?

The main problem I see it things that take multiline definitions (esp if you need to replace an existing def). Is there a way to scope those easily in rpm ?

Alternatively, one could force the use of a @@foo@@ anchor in the target macro file, by changing "put spec def as-is in the target macro file" with "replace the anchor with the def of xxxx in zzz macro file"

What do you think ?

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