Documentation
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Overview ¶
Package protocol holds the constants the ossein HOST and the ossein GUEST must agree on exactly. They live here, in one portable package with no build tags and no platform imports, so that both worlds compile against the SAME declaration — the agreement is enforced by the type checker instead of by a lint recipe grepping two files for matching literals.
A constant belongs here only if BOTH sides hardcode it independently and a mismatch breaks the pairing. Values the host merely computes and then hands to the guest at runtime — the stdio/copy-in vsock ports, the container rootfs path, the static network plan, the Rosetta share tag — are NOT protocol: the guest learns them from the wire, so there is nothing to keep in sync.
Index ¶
Constants ¶
const InitPath = "/sbin/vminitd"
InitPath is where the guest binary lives inside the initfs. tools/build-initfs packs it at this path and the host boots with init=<InitPath> on the kernel cmdline; if the two ever disagreed the kernel would find no init and panic before anything could report why.
const RevEnvVar = "OSSEIN_PROTO_REV"
RevEnvVar is the guest environment variable carrying Revision. The handshake rides on the Getenv RPC — which every guest must implement anyway — so liveness and compatibility are proven in a single round-trip, with no dedicated version RPC.
const Revision = "1"
Revision is the host↔guest protocol revision. The guest advertises it in its environment under RevEnvVar; the host's Dial handshake reads that back and refuses any other value, so an initfs built from a different revision is rejected instead of misbehaving subtly. Bump it whenever the wire semantics change — one edit here now covers both ends.
const VsockPort uint32 = 1024
VsockPort is the guest vsock port serving the SandboxContext API: the guest listens on it as PID 1, the host dials it for the control channel. It is the one port neither side can be told about, since it is how they first meet.
Variables ¶
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Functions ¶
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Types ¶
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Source Files