containerd/runtime.go

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package containerd
import (
"fmt"
"sync"
"golang.org/x/net/context"
)
// NewRuntimeFunc is the runtime's constructor
type NewRuntimeFunc func(root string) (Runtime, error)
var runtimeRegistration = struct {
mu sync.Mutex
runtimes map[string]NewRuntimeFunc
}{
runtimes: make(map[string]NewRuntimeFunc),
}
// RegisterRuntime is not external packages registers Runtimes for use with containerd
func RegisterRuntime(name string, f NewRuntimeFunc) {
runtimeRegistration.mu.Lock()
defer runtimeRegistration.mu.Unlock()
if _, ok := runtimeRegistration.runtimes[name]; ok {
panic(fmt.Errorf("runtime already registered as %q", name))
}
runtimeRegistration.runtimes[name] = f
}
// Runtimes returns a slice of all registered runtime names for containerd
func Runtimes() (o []string) {
runtimeRegistration.mu.Lock()
defer runtimeRegistration.mu.Unlock()
for k := range runtimeRegistration.runtimes {
o = append(o, k)
}
return o
}
// NewRuntime calls the runtime's constructor with the provided root
func NewRuntime(name, root string) (Runtime, error) {
runtimeRegistration.mu.Lock()
defer runtimeRegistration.mu.Unlock()
f, ok := runtimeRegistration.runtimes[name]
if !ok {
return nil, ErrRuntimeNotExist
}
return f(root)
}
type IO struct {
Stdin string
Stdout string
Stderr string
Terminal bool
}
type CreateOpts struct {
// Spec is the OCI runtime spec
Spec []byte
// Rootfs mounts to perform to gain access to the container's filesystem
Rootfs []Mount
// IO for the container's main process
IO IO
}
// Runtime is responsible for the creation of containers for a certain platform,
// arch, or custom usage.
type Runtime interface {
// Create creates a container with the provided id and options
Create(ctx context.Context, id string, opts CreateOpts) (Container, error)
// Containers returns all the current containers for the runtime
Containers() ([]Container, error)
// Delete removes the container in the runtime
Delete(ctx context.Context, c Container) error
// Events returns events for the runtime and all containers created by the runtime
Events(context.Context) <-chan *Event
}