feat: implement host key checking

Closes coop-cloud/organising#237.

pkg/context/context.go

@@ -0,0 +1,44 @@
+package context
+
+import (
+	"errors"
+
+	"github.com/docker/cli/cli/command"
+	dConfig "github.com/docker/cli/cli/config"
+	"github.com/docker/cli/cli/context"
+	contextStore "github.com/docker/cli/cli/context/store"
+	cliflags "github.com/docker/cli/cli/flags"
+	"github.com/moby/term"
+)
+
+func NewDefaultDockerContextStore() *command.ContextStoreWithDefault {
+	_, _, stderr := term.StdStreams()
+	dockerConfig := dConfig.LoadDefaultConfigFile(stderr)
+	contextDir := dConfig.ContextStoreDir()
+	storeConfig := command.DefaultContextStoreConfig()
+	store := newContextStore(contextDir, storeConfig)
+
+	opts := &cliflags.CommonOptions{Context: "default"}
+
+	dockerContextStore := &command.ContextStoreWithDefault{
+		Store: store,
+		Resolver: func() (*command.DefaultContext, error) {
+			return command.ResolveDefaultContext(opts, dockerConfig, storeConfig, stderr)
+		},
+	}
+
+	return dockerContextStore
+}
+
+func GetContextEndpoint(ctx contextStore.Metadata) (string, error) {
+	endpointmeta, ok := ctx.Endpoints["docker"].(context.EndpointMetaBase)
+	if !ok {
+		err := errors.New("context lacks Docker endpoint")
+		return "", err
+	}
+	return endpointmeta.Host, nil
+}
+
+func newContextStore(dir string, config contextStore.Config) contextStore.Store {
+	return contextStore.New(dir, config)
+}