fix: fallback to /usr/bin/env if env is not in PATH

[rickeylev]

This fixes an issue where the bootstrap script would fail if env was not in the PATH, which is the case on NixOS, or when Bazel's strict action env is enabled.

To fix, the bootstrap checks if env exists, and if not, falls back to /usr/bin/env.

Fixes #3575

[gemini-code-assist]

Summary of Changes

Hello @rickeylev, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a compatibility issue in the Python bootstrap script, specifically for environments like NixOS where the env command might not be present in the system's PATH. By implementing a conditional check and a fallback to /usr/bin/env, the change enhances the script's robustness and portability, ensuring it can correctly execute Python interpreters regardless of the env command's direct availability.

Highlights

• Robust env command usage: The bootstrap script now includes a check to determine if the env command is available in the system's PATH. If env is not found, the script will fall back to using the absolute path /usr/bin/env to ensure execution in environments where env might not be directly accessible, such as NixOS.

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Changelog

• python/private/stage1_bootstrap_template.sh
  • Added a conditional statement to check for the existence of the env command in the PATH.
  • Introduced an ENV_CMD variable that dynamically stores either 'env' or '/usr/bin/env' based on the check's outcome.
  • Modified the command array to use the ENV_CMD variable for executing the Python interpreter, ensuring the correct env utility is invoked.

Activity

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[gemini-code-assist]

Code Review

This pull request fixes an issue where the bootstrap script could fail on systems like NixOS where env is not in the PATH. The change introduces a fallback to /usr/bin/env. My review includes a suggestion to make this fallback logic more robust by checking for the existence of /usr/bin/env and failing early with a clear error message if it's not available, which improves debuggability.