We have a self-hosted Atlassian infrastructure. Jira is hooked up to Fecru, and Fecru is hooked up to a Subversion server. Any commit messages that contains a Jira key like PROJKEY-123 show ups in the Jira issue's page under "Development: <number> commits". You can click the that link and it takes you to the Fecru page showing those commits.
I've become the sole developer on one of those projects, and I'd like to switch from subversion to git. However, I don't want to alter history, just start using git going forward. Would I be able to add a git repository to a project, and have Jira show commits from both subversion and git? Old issues would still link to the Subversion commits, while new ones to the git commits.