[Rpm-maint] [rpm-software-management/rpm] RFE: set builsubdir to the *first* extracted archive not the last one (#551)

[Jeff Johnson]

FWIW, here is an implementation that would permit first rather than last definition of %_buildsubdir to be used under user control.

RPM5 permits read only macros which -- when set -- prevent a macro value from being changed.

The syntax prefixes a macro name with a '.' in order to set (actually toggle, but let's not go there) a read only flag.

The '.' is not part of the name, is stripped off to set a read only flag. Any attempt to redefine the macro value is ignored (and warned iirc).

The entire implementation is a couple dozen lines of code.

Adding another configurable macro to define whether _buildsubdir or its read only variant with a '.' prefix is to be used can be configured in rpm in multiple ways.

The read only variant will of course be the first, rather than the last, value defined by %setup, entirely satisfying the RFE stated herein.



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