mattdm added a new comment to an issue you are following:
``
Well, the bug says "support for creating tarballs from Git repositories". That
tarball then gets used in building the RPM, including the source RPM.
As I am understanding your concern, the issue is with a sequence like
1. Do scratch build
2. External repo changes
3. Attempt real build
where #3 could be very different from #1, in a surprising way.
What if, instead of just generating the tarball on the fly, the feature would instead add
to the lookaside cache, and then use that for the build?
``
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https://pagure.io/releng/issue/7498