Closes https://github.com/apple/container/issues/1687
The default kernel archive is downloaded from a remote release URL
during first-run setup and via `container system kernel set
--recommended`. Previously, the archive contents were not verified after
download, so integrity depended on HTTPS and the release artifact
remaining unchanged.
This change adds digest verification for kernel archives. The
recommended/default kernel now has pinned digest metadata using an
algorithm-prefixed value such as `sha256:<hex>`. `container system
kernel set --tar` accepts `--digest`; remote tar URLs require it, and
local tar archives can also be verified before unpacking and
installation.
The system config also supports `kernel.digest`, and a custom
`kernel.url` must provide a digest for that archive.
- This change adds two types to support opaque runtime
data passing through the APIServer:
- RuntimeConfiguration `data`
- RuntimeLinuxData type
- LinuxRuntimeData defines runtime specific information.
With this change, it will support `variant` only. The
optional RuntimeConfiguration `data` field encodes
runtime specific data to pass through the APIServer.
It is decoded as needed by the runtime.
- The idea is to eventually move all runtime specific data
into the `data` field so that the APIServer is only aware
of generic container information.
Raj