fetch_changesets should have parameter for repository
To trigger the update of a git repository (or other SCM), a special URL can be called.
Explained here: http://www.redmine.org/projects/redmine/wiki/HowTo_setup_automatic_refresh_of_repositories_in_Redmine_on_commit
The call to this URL currently supports 2 parameters:
key: the WS key
id : the project numeric id or project identifier
As redmine supports multiple repositories per project now, it would be nice to have an additional parameter, so that only a specific repository can be selected to be updated.
Normally, this trigger URL will be called by some hook script of one repository and it does not make sense to update all repositories of a project then.