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The operation to gather a list of available ROS packages is an expensive operation because it needs to crawl recursively through the file system. Therefore the tools cache the result for a certain amount of time. The command line option --force-discover enforces a crawling (ignoring the cache) and therefore ensures that you get an up-to-date result.
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The operation to gather a list of available ROS packages is an expensive operation because it needs to crawl recursively through the file system. Therefore the tools cache the result for a certain amount of time. The command line option --force-discover enforces a crawling (ignoring the cache) and therefore ensures that you get an up-to-date result.
rospack has a rather short maximum age for the cache (60s). rqt on the other hand reuses the cache for a pretty long time of (1 day).
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