= Gerrit Code Review - Commit Validation

Gerrit supports link:dev-plugins.html[plugin-based] validation of
commits.

[[new-commit-validation]]
== New commit validation


Plugins implementing the `CommitValidationListener` interface can
perform additional validation checks against new commits.

If the commit fails the validation, the plugin can either provide a
message that will be sent back to the git client, or throw an exception
which will cause the commit to be rejected.

Validation applies to both commits uploaded via `git push`, and new
commits generated via Gerrit's Web UI features such as the rebase, revert
and cherry-pick buttons.

Out of the box, Gerrit includes a plugin that checks the length of the
subject and body lines of commit messages on uploaded commits.

[[pre-merge-validation]]
== Pre-merge validation


Plugins implementing the `MergeValidationListener` interface can
perform additional validation checks against commits before they
are merged to the git repository.

If the commit fails the validation, the plugin can throw an exception
which will cause the merge to fail.

[[new-project-validation]]
== New project validation


Plugins implementing the `ProjectCreationValidationListener` interface
can perform additional validation on project creation based on the
input arguments.

E.g. a plugin could use this to enforce a certain name scheme for
project names.

[[new-group-validation]]
== New group validation


Plugins implementing the `GroupCreationValidationListener` interface
can perform additional validation on group creation based on the
input arguments.

E.g. a plugin could use this to enforce a certain name scheme for
group names.


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