The `rbm fetch` command is used to fetch new commits from git/hg repositories. It currently takes the following options: ``` rbm fetch [project] ``` In tor-browser-build we have a single `make fetch` command fetching commits from all components, which should work for any type of build (release/alpha/nightly) as they currently all use the same git repositories. In legacy/trac#24179 however we are thinking about using a different git repository for releases and the nightly build, which means `rbm fetch` needs to know which type of build we want to fetch, so it should support `--target` options.