This is a bit more efficient in that we're not walking full paths, and
it helps avoid security/reliability issues if an attacker (or just a
misbehaving process) has the ability to mutate paths in the middle.
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.
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