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install: scrub find-links and carry the pinned scrub through pip fallbacks

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Round 4 of the pinned-index hardening:

1. UV_FIND_LINKS joins every pinned-install scrub (install.sh, install.ps1,
   setup.ps1, install_python_stack.py): uv's --find-links locations can
   satisfy torch off the pinned index the same way an extra index does.

2. setup.ps1's Fast-Install restored the scrubbed vars in its finally
   BEFORE the pip fallback ran, and never touched the pip env vars at all,
   so a failed uv attempt fell back to python -m pip with an inherited
   PIP_EXTRA_INDEX_URL / PIP_FIND_LINKS able to win over the pinned
   --index-url. The scrub now wraps the whole function (uv attempt + pip
   fallback) and includes the pip vars; restore happens after both.

3. install_python_stack.py's scrub also strips PIP_FIND_LINKS for its own
   pip fallback, completing the PIP_EXTRA_INDEX_URL fix from round 3.

Parity tests extended (2 new tests).
This commit is contained in:
Daniel Han 2026-07-12 11:32:20 +00:00
commit 83fefac6d2
5 changed files with 48 additions and 17 deletions
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2
studio/install_python_stack.py
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@ -2594,7 +2594,9 @@ _UV_INDEX_ENV_VARS = (
"UV_INDEX",
"UV_EXTRA_INDEX_URL",
"UV_TORCH_BACKEND",
"UV_FIND_LINKS",
"PIP_EXTRA_INDEX_URL",
"PIP_FIND_LINKS",
)