[Bug 258891] devel/py-setuptools_scm: tries to git archive the entire ports tree on build

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258891

--- Comment #5 from Kai Knoblich <kai@FreeBSD.org> ---
Created attachment 228549
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228549&action=edit
DRAFT-workaround-for-py-setuptools_scm-v1.patch

(In reply to Robert Clausecker from comment #4)

I was able to verify the issue, thanks for the pointers. As you already
mentioned in comment #1 and comment #2, a broader workaround is required. 

This is because ports, that have devel/py-setuptools_scm as a dependency, make
use of its entrypoints during build which triggers then "file_finder_git" if a
".git" directory is found.

Tampering with the entrypoints of devel/py-setuptools_scm (e.g. to patch out
"file_finder_git") seems not be a good idea so the workaround with the
GIT_CEILING_DIRECTORIES environment might be a good workaround.

Attached is a preliminary patch that sets GIT_CEILING_DIRECTORIES if
"USE_PYTHON=distutils" is set.

First tests were ok, but I've to test it in more detail in the next few days.
I'll also soon create a review so that others from python@ can also look at it.

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