With prior releases, I saved a bunch of bandwidth with system-upgrading multiple machines by stashing away a copy of the downloaded /var/lib/dnf/system-upgrade, and then copying it to the remaining boxes upfront. That directory was just a flat directory, containing the downloaded rpms, and their system-upgrades simply saw that most of the stuff was already downloaded.
Looks like in F27, /var/lib/dnf/system-upgrade is an entire directory structure, and each repository's packages are stashed away in subdirectory that are tagged with the repository's current version tag.
What's the best way to minimize downloads now? I could make a copy of the entire /var/lib/dnf/system-upgrade structure, but I will be rolling the upgrades over the course of several days, during which I expect all the update repos to be updated as usual, with their version tags changing.
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