That local cache is often implemented as a drop-in replacement for the upstream package repository, and packages are still installed with the same package manager (yum,apt,pip,npm).
replyAforementioned security vulnerabilities don’t strike as a potential reason to you?
replyFriend, considering the supply chain attacks going on these days, automatically updating everything, immediately, probably isn't the perfect move either.
replyYou need to automatically update from a trusted source. That source better audit and update constantly. Which is hard.
replyIgnoring the real benefits of security updates to prevent the unlikely event of supply chain attacks sounds like a weird tradeoff.
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