Where does pre-commit install "environments"?

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I'm trying to setup pre-commit for a Python project's repository. Upon running pre-commit install I see an output like this:

[INFO] Installing environment for https://github.com/asottile/seed-isort-config.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for https://github.com/pre-commit/mirrors-isort.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for https://github.com/pre-commit/mirrors-pylint.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...

What are these "environments" and where are they being installed to?

pre-commit.com pre-commit-hook pre-commit python git
2 Answers

The environments are installed into a cache:

pre-commit by default places its repository store in ~/.cache/pre-commit -- this can be configured in two ways:

  • PRE_COMMIT_HOME: if set, pre-commit will use that location instead.
  • XDG_CACHE_HOME: if set, pre-commit will use $XDG_CACHE_HOME/pre-commit following the XDG Base Directory Specification.

disclaimer: I am the author

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