pre-commit
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## Name

pre-commit — Notification just prior to commit completion.

## Description

The `pre-commit` hook is run just before a commit transaction is promoted to a new revision. Typically, this hook is used to protect against commits that are disallowed due to content or location (e.g., your site might require that all commits to a certain branch include a ticket number from the bug tracker, or that the incoming log message is nonempty).

If the `pre-commit` hook program returns a nonzero exit value, the commit is aborted, the commit transaction is removed, and anything printed to `stderr` is marshalled back to the client.

## Input parameter(s)

The command-line arguments passed to the hook program, in order, are:

1. Repository path

2. Commit transaction name

## Common uses

Change validation and control

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