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Document PRE_COMMIT environment variable #1071

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Document PRE_COMMIT environment variable #1071

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Expand Up @@ -885,3 +885,8 @@ tag or SHA) and will cache based on that. Using a branch name (or `HEAD`) for
the value of [`rev`](#repos-rev) is not supported and will only represent the state of
that mutable ref at the time of hook installation (and will *NOT* update
automatically).

## Detecting when `pre-commit` is running

You can check for the existence of the `PRE_COMMIT` environment variable within
a hook to determine if it's being run from `pre-commit`.
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