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The compression feature of btrfs allows us to store more in the size-limited /usr and OEM partitions. The size should of course still be monitored to not bloat the image but more headroom helps to try things out quickly without hitting the hard limit which fails the build. Use btrfs for the OEM partition but with zlib compression because the outdated GRUB version doesn't support zstd yet. New subvolumes currently can't be used for the OEM partition as default subvolumes because GRUB tries to read the grub.cfg from the top subvolume (at least with our old version). (We could however use subvolumes for the /usr partition when switching to btrfs if that makes any sense.)
Flatcar Container Linux SDK scripts
Welcome to the scripts repo, your starting place for most things here in the Flatcar Container Linux SDK. To get started you can find our documentation on the Flatcar docs website.