Fetch metadata from a location, updating the index. This should always be relatively quick as it updates only small files that contain information about what can be found in remote packets.
Arguments
- location
The name of a location to pull from (see orderly_location_list for possible values). If not given, pulls from all locations. The "local" and "orphan" locations are always up to date and pulling metadata from them does nothing.
- root
The path to the root directory, or
NULL(the default) to search for one from the current working directory. This function does not require that the directory is configured for orderly, and can be anyoutpackroot (see orderly_init for details).