将值重新分配给spec文件中的％define变量

将值重新分配给spec文件中的％define变量 - RPM(Reassign values to %define variables in spec file - RPM)

当我们使用spec文件中的％define标签定义变量以使用rpmbuild命令构建RPM时...是否可以在％pre上更新其值并在以后使用它？

When we define variables using the %define tag in a spec file to build an RPM using the rpmbuild command ... is it possible to update its value on %pre and use it later on ?

最满意答案

没有。

%define宏总是在spec文件中从上到下重新评估，因此不能有循环。

%global宏是一次性的。

例如， 关于“需要”处理的另一个问题 ：

%global _use_internal_dependency_generator 0 %global __find_requires_orig %{__find_requires} %define __find_requires %{_builddir}/%{?buildsubdir}/build/find-requires %{__find_requires_orig}

如果我使用%define来声明__find_requires_orig ，则会出现宏循环错误。

如果这不能回答您的问题，请详细说明您要查找的信息或最终目标。

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ETA：

%pre和%post部分已经具有从构建RPM时硬编码的宏。 如果您需要做出额外的运行时决策，则需要在这些shell脚本中完成。

No.

%define macros are always re-evaluated, top to bottom in the spec file, so you cannot have loops.

%global macros are one-time.

Example, from another question concerning 'requires' processing:

%global _use_internal_dependency_generator 0 %global __find_requires_orig %{__find_requires} %define __find_requires %{_builddir}/%{?buildsubdir}/build/find-requires %{__find_requires_orig}

If I had used %define to declare __find_requires_orig, it would error out with a macro loop.

If this doesn't answer your question, please elaborate what information you are looking for, or your end goal.

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ETA:

The %pre and %post sections will already have the macros hard-coded from when the RPM is built. If you need additional run-time decisions to be made, they will need to be done in those shell scripts.