uv.lock -> pex optimization#23365
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…ockfile When building a PEX for a small set of requirements from a uv resolve, the previous behavior synced the entire lockfile into a shared venv, which exhausted disk on cold CI agents with large resolves (e.g. torch + CUDA). For the PexRequirements case (a subset of a resolve), we now: 1. Add a [dependency-groups] section to the ephemeral pyproject.toml 2. Run `uv lock` to register the group in the lock (~0ms, no network) 3. Run `uv sync --only-group pants-subset --frozen` to install only the transitive dependencies of the requested packages Each unique subset gets its own venv path (keyed by a hash of the req_strings) so different targets don't overwrite each other's venvs. The EntireLockfile case is unchanged (still uses --all-extras). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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