Allow Stash/Bitbucket Server Repository Trigger to use Subdirectory instead of full Repository

Problem Definition

Currently, the Repository Trigger for Stash/Bitbucket Server will trigger a build on any change in a repository. This can be an issue for users with large repositories, where a certain Build Plan only relates to a subdirectory.

Suggested Solution

Add functionality to trigger on changes to a specific subdirectory of a repository.

Workaround

In the Linked Repository settings, you can use the "Include/exclude files" option:

1. Go to Administration >> Linked repositories
2. Select your repository, or create a new one
3. Under "Advanced options" select "Include only changes that matches to the following pattern"
4. Input a regular expression to search for, which could be your subdirectory (you may need to escape some characters):
   sub/directory/*

See also

Please see this Atlassian Answer for more detail and discussion on this workaround.