jschoubben
ee2648188d
96 comments across the two repos named records that no longer exist. Each now points at the consolidated record that holds its reasoning -- ADR 0034 (a test defends a decision) is 0017, the eight host records are 0005, the four lab records are 0016. Worth noting for next time: these are references from outside HQ, so renumbering there is not free. It cost 38 files here.
83 lines
3.8 KiB
Go
83 lines
3.8 KiB
Go
package system
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import (
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"context"
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"fmt"
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"github.com/novox/mesh-host/internal/declaration"
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)
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// android is a partial host, and being partial is the point.
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//
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// It implements `file`, `directory` and `action` — the shapes that need only a filesystem and a
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// way to run something — and refuses the other three. That is not a broken host: a declaration
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// naming a shape this host does not implement is refused whole, the same treatment an unknown
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// type gets, and the profile tells the control plane which shapes exist so it never sends one
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// it cannot do (novox/hq ADR 0005).
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//
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// What it cannot do, and why:
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//
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// - **package** — there is no package manager an ordinary app may drive. Installing software
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// on Android means the framework installing an APK, which is not something a process asks
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// for on its own behalf.
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// - **service** — Android's init reads .rc files from the system partition, which needs root
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// and an unlocked bootloader. On a normal device nothing can register with it.
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// - **container** — no container runtime, and no kernel access to give one.
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//
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// **This host is EPISODIC** (novox/hq ADR 0005). Everywhere else an init runs the launcher at
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// boot and the launcher supervises the host. Android grants neither: nothing to register with
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// without root, and nothing worth supervising, because a supervisor would be killed alongside
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// what it supervises.
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//
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// So it runs when the platform allows and is killed when the platform wants the memory — and
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// that is **disconnection**, which ADR 0004 already made an ordinary situation rather than an
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// exception. It needs no keep-alive and no new mechanism: the store is already authoritative
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// while disconnected, reconcile already happens on start, and the mesh already reports *last
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// heard from* rather than alarming on silence.
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//
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// It also **cannot be the first node** — every step of raising a substrate is a shape it
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// refuses — and its bundle says so rather than being an empty placeholder.
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type android struct{}
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func (android) Name() string { return "android" }
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func (android) Shapes() []declaration.Type { return portableShapes() }
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func (android) Confirm(ctx context.Context, run Runner) error {
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// Ask the property service, which exists on every Android and nowhere else. A file path
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// check would pass inside a chroot; this asks something only Android answers.
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if _, err := run(ctx, "getprop", "ro.build.version.sdk"); err != nil {
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return fmt.Errorf(
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"this is the android host and the property service does not answer here. Either "+
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"this is not Android, or it is a container without it: %w", err)
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}
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return nil
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}
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// The four below are unreachable through the ordinary path: Check refuses a declaration naming
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// these shapes before anything is applied. They are here so that "unreachable" fails loudly if
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// it ever stops being true, rather than a nil applier being called.
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func (a android) PackageInstalled(context.Context, Runner, string) (bool, error) {
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return false, fmt.Errorf("%w: package (there is no package manager an app may drive)", ErrUnsupported)
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}
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func (a android) InstallPackage(context.Context, Runner, string) error {
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return fmt.Errorf("%w: package", ErrUnsupported)
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}
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func (a android) ServiceState(context.Context, Runner, string) (string, error) {
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return "", fmt.Errorf("%w: service (init is not reachable without root)", ErrUnsupported)
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}
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func (a android) SetServiceState(context.Context, Runner, string, string) error {
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return fmt.Errorf("%w: service", ErrUnsupported)
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}
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func (a android) ServiceBoot(context.Context, Runner, string) (string, error) {
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return "", fmt.Errorf("%w: service", ErrUnsupported)
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}
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func (a android) SetServiceBoot(context.Context, Runner, string, string) error {
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return fmt.Errorf("%w: service", ErrUnsupported)
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}
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