Add unpack strategy to SnapshotStore #274
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Signed-off-by: Aditya Ramani <[email protected]>
jglogan
reviewed
Jul 1, 2025
| guard platform.os == "linux" else { | ||
| return nil | ||
| } | ||
| var minBlockSize = 512.gib() |
Contributor
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Is this a disk/filesystem size, or a block size? Is the blockSizeInBytes parameter to EXT4Unpacker a bit misleading?
jglogan
approved these changes
Jul 1, 2025
| } | ||
| var minBlockSize = 512.gib() | ||
| if image.reference == ClientDefaults.get(key: .defaultInitImage) { | ||
| minBlockSize = 512.mib() |
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Let's see if we can move this to a UserDefault in a followup so that end users can customize this size.
crosbymichael
approved these changes
Jul 1, 2025
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Define a
UnpackStrategyfunction type in theSnapshotStoreto give more control over how an image is unpacked.Previously, we were creating a 512 GB sparse block file for the initial file system of a container, which is overkill.
With this change, the vminit image is unpacked to a smaller block file, while container images are unpacked to the 512 GB block
Follows the same pattern as https://github.com/apple/container/blob/main/Sources/Helpers/RuntimeLinux/RuntimeLinuxHelper.swift#L71