[python] set UV_PROJECT_ENVIRONMENT and UV_NO_DEV env vars by nsidnev · Pull Request #15715 · vercel/vercel

nsidnev · 2026-03-25T19:22:37Z

By default uv doesn't respect the VIRTUAL_ENV env var without the --active flag. We pass it when preparing the venv for the builder, but if a user specifies their own installCommand or buildCommand, they will most likely not pass this flag. This will result in the creation of an extra .venv with a warning from uv, and we don’t want that. The fix is to provide UV_PROJECT_ENVIRONMENT set to the value of VIRTUAL_ENV so that uv uses our custom venv environment without any complains. Also sets UV_NO_DEV, so users won't be required to pass --no-dev manually for commands

changeset-bot · 2026-03-25T19:22:47Z

🦋 Changeset detected

Latest commit: 81eb59d

The changes in this PR will be included in the next version bump.

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@vercel/python	Patch
vercel	Patch

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github-actions · 2026-03-25T19:23:03Z

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vercel · 2026-03-25T19:24:03Z

Low Risk — Environment variable addition for Python venv tooling compatibility.

utils.ts: added UV_PROJECT_ENVIRONMENT env var set to venvPath
unit.test.ts: added test assertions for new env var

^{Assessed at e40d793.}

github-actions · 2026-03-25T19:24:25Z

🧪 Unit Test Strategy

Comparing: da0959d → 81eb59d (view diff)

Strategy: Affected packages only

✅ Only testing packages that have been modified or depend on modified packages.

Affected packages - 2 (5%)

@vercel/python
vercel

Unaffected packages - 38 (95%)

@vercel-internals/get-package-json
@vercel/backends
@vercel/build-utils
@vercel/cervel
@vercel/cli-auth
@vercel/client
@vercel/config
@vercel/detect-agent
@vercel/edge
@vercel/elysia
@vercel/error-utils
@vercel/express
@vercel/fastify
@vercel/firewall
@vercel/frameworks
@vercel/fs-detectors
@vercel/functions
@vercel/gatsby-plugin-vercel-builder
@vercel/go
@vercel/h3
@vercel/hono
@vercel/hydrogen
@vercel/koa
@vercel/nestjs
@vercel/next
@vercel/node
@vercel/oidc
@vercel/oidc-aws-credentials-provider
@vercel/python-analysis
@vercel/redwood
@vercel/related-projects
@vercel/remix-builder
@vercel/routing-utils
@vercel/ruby
@vercel/rust
@vercel/static-build
@vercel/static-config
examples

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E2E tests: Running in parallel via E2E Tests workflow
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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @vercel/build-utils@13.15.0 ### Minor Changes - [services] allow multiple v2beta triggers for a single Lambda when config is coming from services ([#15890](#15890)) ### Patch Changes - Add deserialization utilities ([#15927](#15927)) ## @vercel/fs-detectors@5.16.0 ### Minor Changes - Parse python module:variable entrypoint notation in experimentalServices for all service types. ([#15844](#15844)) ### Patch Changes - Updated dependencies \[[`4e62f6c2204dd148643f86f140f0ae7995778017`](4e62f6c), [`42a70e1e6318615bd420933f9cc978bed3a43936`](42a70e1)]: - @vercel/build-utils@13.15.0 ## @vercel/python@6.31.0 ### Minor Changes - Parse python module:variable entrypoint notation in experimentalServices for all service types. ([#15844](#15844)) ### Patch Changes - [python] set the `UV_PROJECT_ENVIRONMENT` and `UV_NO_DEV` env vars so that custom `installCommand` and `buildCommand` commands can be called without the `--active` and `--no-dev` flags ([#15715](#15715)) ## @vercel/backends@0.0.60 ### Patch Changes - Include the entrypoint path in the build complete log message. ([#15914](#15914)) - Updated dependencies \[[`4e62f6c2204dd148643f86f140f0ae7995778017`](4e62f6c), [`42a70e1e6318615bd420933f9cc978bed3a43936`](42a70e1)]: - @vercel/build-utils@13.15.0 ## @vercel/cervel@0.0.47 ### Patch Changes - Updated dependencies \[[`8b77cdcd71ba645df4eed52cdccde9a2cbb913f8`](8b77cdc)]: - @vercel/backends@0.0.60 ## vercel@51.2.1 ### Patch Changes - Add `ai-gateway api-keys create` command for creating AI Gateway API keys with optional quota limits ([#15744](#15744)) - Improve `vercel blob list-stores` with `--json` and `--no-projects`, exclude non-blob stores when the API returns a `type` field, and show a richer table for non-TTY output while keeping linked-project filtering, `--all`, and interactive store selection on TTY. ([#14653](#14653)) - Add a `project rename` command to rename projects from the CLI. ([#15918](#15918)) - Updated dependencies \[[`8b77cdcd71ba645df4eed52cdccde9a2cbb913f8`](8b77cdc), [`2d7d14db1c6448f716d1ccc30844b43f47e8e6ee`](2d7d14d), [`d731f1b69030ddcaa0b7f4f1854f79ea92671b1e`](d731f1b), [`4e62f6c2204dd148643f86f140f0ae7995778017`](4e62f6c), [`45c8d4f54cc831695375794964a29145860fa45b`](45c8d4f), [`42a70e1e6318615bd420933f9cc978bed3a43936`](42a70e1)]: - @vercel/backends@0.0.60 - @vercel/python@6.31.0 - @vercel/next@4.16.7 - @vercel/build-utils@13.15.0 - @vercel/elysia@0.1.63 - @vercel/express@0.1.73 - @vercel/fastify@0.1.66 - @vercel/go@3.5.0 - @vercel/h3@0.1.72 - @vercel/hono@0.2.66 - @vercel/hydrogen@1.3.6 - @vercel/koa@0.1.46 - @vercel/nestjs@0.2.67 - @vercel/node@5.7.5 - @vercel/redwood@2.4.12 - @vercel/remix-builder@5.7.2 - @vercel/ruby@2.3.2 - @vercel/rust@1.1.0 - @vercel/static-build@2.9.13 ## @vercel/client@17.3.2 ### Patch Changes - Updated dependencies \[[`4e62f6c2204dd148643f86f140f0ae7995778017`](4e62f6c), [`42a70e1e6318615bd420933f9cc978bed3a43936`](42a70e1)]: - @vercel/build-utils@13.15.0 ## @vercel/elysia@0.1.63 ### Patch Changes - Updated dependencies \[]: - @vercel/node@5.7.5 ## @vercel/express@0.1.73 ### Patch Changes - Updated dependencies \[]: - @vercel/cervel@0.0.47 - @vercel/node@5.7.5 ## @vercel/fastify@0.1.66 ### Patch Changes - Updated dependencies \[]: - @vercel/node@5.7.5 ## @vercel/gatsby-plugin-vercel-builder@2.1.13 ### Patch Changes - Updated dependencies \[[`4e62f6c2204dd148643f86f140f0ae7995778017`](4e62f6c), [`42a70e1e6318615bd420933f9cc978bed3a43936`](42a70e1)]: - @vercel/build-utils@13.15.0 ## @vercel/h3@0.1.72 ### Patch Changes - Updated dependencies \[]: - @vercel/node@5.7.5 ## @vercel/hono@0.2.66 ### Patch Changes - Updated dependencies \[]: - @vercel/node@5.7.5 ## @vercel/koa@0.1.46 ### Patch Changes - Updated dependencies \[]: - @vercel/node@5.7.5 ## @vercel/nestjs@0.2.67 ### Patch Changes - Updated dependencies \[]: - @vercel/node@5.7.5 ## @vercel/next@4.16.7 ### Patch Changes - Update to latest Next.js adapter ([#15456](#15456)) ## @vercel/node@5.7.5 ### Patch Changes - Updated dependencies \[[`4e62f6c2204dd148643f86f140f0ae7995778017`](4e62f6c), [`42a70e1e6318615bd420933f9cc978bed3a43936`](42a70e1)]: - @vercel/build-utils@13.15.0 ## @vercel/static-build@2.9.13 ### Patch Changes - Updated dependencies \[]: - @vercel/gatsby-plugin-vercel-builder@2.1.13 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

[python] set UV_PROJECT_ENVIRONMENT env var

e40d793

nsidnev requested review from a team as code owners March 25, 2026 19:22

set UV_NO_DEV

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nsidnev changed the title ~~[python] set UV_PROJECT_ENVIRONMENT env var~~ [python] set UV_PROJECT_ENVIRONMENT and UV_NO_DEV env vars Apr 11, 2026

vercel Bot deployed to Preview April 11, 2026 04:07 View deployment

Merge branch 'main' into nsidnev/uv-active-venv

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vercel Bot deployed to Preview April 11, 2026 04:09 View deployment

Merge branch 'main' into nsidnev/uv-active-venv

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vercel Bot deployed to Preview April 12, 2026 00:29 View deployment

gscho approved these changes Apr 13, 2026

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Merge branch 'main' into nsidnev/uv-active-venv

81eb59d

nsidnev enabled auto-merge (squash) April 14, 2026 00:10

vercel Bot deployed to Preview April 14, 2026 00:11 View deployment

nsidnev merged commit 2d7d14d into main Apr 14, 2026
178 checks passed

nsidnev deleted the nsidnev/uv-active-venv branch April 14, 2026 01:04

vercel-cli-release-bot mentioned this pull request Apr 14, 2026

Version Packages #15936

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[python] set UV_PROJECT_ENVIRONMENT and UV_NO_DEV env vars#15715

[python] set UV_PROJECT_ENVIRONMENT and UV_NO_DEV env vars#15715
nsidnev merged 5 commits into
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nsidnev/uv-active-venv

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