Cleanup temporary files

[ezrizhu]

Do we want to cleanup the tempdir and tempfiles that we make?

[mgree]

If they're in /tmp we shouldn't need to care about it.

I can imagine having some kind of trap 'cleanup' EXIT that would remove files if things borked before we ran the command. But once it's run, we shouldn't delete anything.

Longer term, we'd like to be able to store and name try results by some SHA-like code, which means keeping them somewhere more durable.

[mgree]

A good first issue:

• Identify the temporary files we've created (the two shell scripts, tmp directory) and store them in a CLEANUP variable
• Set a trap to remove them if, e.g., the calls to unshare or mount fail
• After the command runs, disable the trap, leave the directory, and delete the shell scripts