Implement --ephemeral flag about trin HOT 4 CLOSED

When I was doing this in the python implementation I came up with the --ephemeral flag which took care of establishing a temporary directory in which all data would be housed. In most cases the desired shutdown behavior would be to cleanup this directory (delete it and all of its contents), though it would almost definitely be valuable to be able to retain this information. I would recommend potentially combining these two approaches ad doing this:

• Implement --ephemeral mode that uses a temporary directory within XDG_CACHE_HOME, using the node-id prefix solution outlined here for determining the directory
• Leave some sort of marker in that directory to signal when the directory was last used
• Maybe make some form of automation that will cleanup this directory, or alternatively, make the --ephemeral flag automatically purge the oldest directories once there are too many.

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What's the reasoning for using the first few instead of last 8?

Now that I ask I'm guessing it's because the beginning part is more easily comparable by eye, like with git commit hashes.

Yeah, it is related to Jason's comment here.

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It will be better, if we change this to append the first few characters (instead of last 8)

What's the reasoning for using the first few instead of last 8?

Now that I ask I'm guessing it's because the beginning part is more easily comparable by eye, like with git commit hashes.

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PR #277 is ready for review 👍

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