f2e0162846cbb84abf6fd9a38fabdfd588f4eb2f
We don't want to allow MITM attackers to intercept upgrade requests and provide clients with older OS versions vulnerable to security flaws. Only "ostree admin upgrade" gets this behavior for now - whether we want to do it for "ostree admin switch" is another question.
OSTree is a tool for managing bootable, immutable, versioned filesystem trees. While it takes over some of the roles of tradtional "package managers" like dpkg and rpm, it is not a package system; nor is it a tool for managing full disk images. Instead, it sits between those levels, offering a blend of the advantages (and disadvantages) of both.
For more information, see:
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