35 lines
1.5 KiB
Markdown
35 lines
1.5 KiB
Markdown
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# SmartVM Base Image Bundles
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This directory documents the project-owned base image manifest format. The actual kernel and rootfs binaries should be hosted as release assets or in object storage, not committed to git.
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## Bundle Layout
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A hosted bundle should expose three files:
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```text
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smartvm-minimal-v1-x86_64.manifest.json
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vmlinux
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rootfs.ext4
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```
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The manifest is the only file shape `smartvm` needs to know. It points at the hosted kernel and rootfs artifacts and records checksums.
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## Manifest Fields
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- `schemaVersion`: currently `1`
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- `bundleId`: stable cache key, using letters, numbers, dot, underscore, and dash only
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- `arch`: `x86_64` or `aarch64`
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- `firecrackerVersion`: Firecracker version validated with this bundle
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- `rootfsType`: `ext4` or `squashfs`
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- `rootfsIsReadOnly`: use `true` for squashfs or immutable rootfs images
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- `bootArgs`: kernel boot args to use with the bundle
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- `kernel`: hosted kernel artifact URL/path plus `sha256` for URL artifacts and optional `sizeBytes`
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- `rootfs`: hosted rootfs artifact URL/path plus `sha256` for URL artifacts and optional `sizeBytes`
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- `fileName`: optional plain output filename; path separators are rejected
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`sha256` is required for hosted URL artifacts. `sizeBytes` is optional but helps catch incomplete downloads.
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## Cache Behavior
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Downloaded bundles are cached under `/tmp/.smartvm/base-images` by default. The cache keeps two bundles unless `maxStoredBaseImages` is configured. Eviction is announced with `console.warn`.
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