The rosdistro tool allows you to get access to the full dependency tree and
the version control system information of all packages and repositories. To
increase performance, the rosdistro tool will automatically look for a cache
file on your local disk. If no cache file is found locally, it will try to
download the latest cache file from the server. The cache files are only used
to improve performance, and are not needed to get correct results. rosdistro
will automatically go to Github to find any dependencies that are not part
of the cache file. Note that operation without a cache file can be very slow,
depending on your own internet connection and the response times of Github.
The rosdistro tool will always write the latest dependency information to a
local cache file, to speed up performance for the next query.
