The mr(1) command can checkout, update, or perform other actions on a set of repositories as if they were one combined respository. It supports any combination of subversion, git, cvs, mecurial, bzr and darcs repositories, and support for other revision control systems can easily be added. (There are extensions adding support for unison and git-svn.)

It is extremely configurable via simple shell scripting. Some examples of things it can do include:

• Update a repository no more frequently than once every twelve hours.
• Run an arbitrary command before committing to a repository.
• When updating a git repository, pull from two different upstreams and merge the two together.
• Run several repository updates in parallel, greatly speeding up the update process.

mr is available in git at git://git.kitenet.net/mr, or in gitweb. It's recently been added to Debian. If you want a tarball, the best place to get one if from http://packages.debian.org/unstable/source/mr.

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