Some commands generates some kinds of result files in the repository directory, which don't intend to be tracked by git. For example, srpm generates *.src.rpm, local generates .build-*.log. rpkg could have the ability to ignore them automatically instead of letting packagers to edit gitignore manually again and again, especially when a packager maintains a few packages.

A possible solution is to define a list of patterns to ignore, and add them to .git/info/exclude once the repository is cloned successfully. Meanwhile, the list should be able to be extended easily by downstream tool, e.g. bodhi.template might be added by fedpkg.