[Rpm-maint] [rpm-software-management/rpm] A specfile parser without Turing-Complete side-effects (Discussion #3906)

[Kan-Ru Chen]

> Looking at past commits and executing their contents is certainly surprising behavior. It's entirely possible to have something like rpmautospec without that property, by flipping control around: The not-so-hypothetical rpmautospec replacement needs to determine the package version from the Git commit log (excluding blob contents) and present this information to the spec file—as a macro. Then the dependency on past content goes away (instead there's a dependency on past commit messages).

This is similar to how dpkg does it. The version is extracted from the changelog file and it's the only place a complete version exists. Although the changelog file is the source of truth, tools like [gdp dch](https://honk.sigxcpu.org/piki/projects/git-buildpackage/) can help generate changelog entries from git commit messages (it seems there's even some support for rpm).

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