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Document PRE_COMMIT environment variable #1071

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asottile merged 1 commit into from
Apr 5, 2026
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Document PRE_COMMIT environment variable #1071

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3 changes: 3 additions & 0 deletions sections/new-hooks.md
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Expand Up @@ -4,6 +4,9 @@ installable package (gem, npm, pypi, etc.) or exposes an executable, it can be
used with pre-commit. Each git repo can support as many languages/hooks as you
want.

_new in 2.5.0_: `pre-commit` sets the `PRE_COMMIT=1` environment variable
during hook execution.

The hook must exit nonzero on failure or modify files.

A git repo containing pre-commit plugins must contain a `.pre-commit-hooks.yaml`
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