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Merged
edmorley merged 1 commit into from
Oct 2, 2025
Merged

Use pip install --isolated when bootstrapping pip/Poetry #434

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4 changes: 4 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

## [Unreleased]

### Changed

- Changed the `pip install` commands used to install the pip and Poetry package managers to now use `--isolated` mode. ([#434](https://github.com/heroku/buildpacks-python/pull/434))

## [2.5.1] - 2025-09-23

### Changed
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4 changes: 4 additions & 0 deletions src/layers/pip.rs
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Expand Up @@ -94,6 +94,10 @@ pub(crate) fn install_pip(
.args([
&bundled_pip_module_path.to_string_lossy(),
"install",
// Don't load any user-supplied pip configuration (pip.conf and `PIP_` env vars) given
// that this is an internal step for installing pip (rather than app dependencies), and
// so (a) doesn't need custom config, (b) we don't want the user to be able to break it.
"--isolated",
// There is no point using pip's cache here, since the layer itself will be cached.
"--no-cache-dir",
"--no-input",
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4 changes: 4 additions & 0 deletions src/layers/poetry.rs
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Expand Up @@ -92,6 +92,10 @@ pub(crate) fn install_poetry(
"install",
// Setting this via CLI args since for Poetry we aren't setting `PIP_DISABLE_PIP_VERSION_CHECK`.
"--disable-pip-version-check",
// Don't load any user-supplied pip configuration (pip.conf and `PIP_` env vars) given
// that this is an internal step for installing Poetry (rather than app dependencies), and
// so (a) doesn't need custom config, (b) we don't want the user to be able to break it.
"--isolated",
// There is no point using pip's cache here, since the layer itself will be cached.
"--no-cache-dir",
"--no-input",
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