add dry-run support to create command

Signed-off-by: Guillaume Lours <[email protected]>

Author: glours

pkg/api/dryrunclient.go

@@ -24,6 +24,7 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"runtime"
 	"strings"
 	"sync"
 
@@ -84,6 +85,12 @@ func NewDryRunClient(apiClient client.APIClient, cli *command.DockerCli) (*DryRu
 	}, nil
 }
 
+func getCallingFunction() string {
+	pc, _, _, _ := runtime.Caller(2)
+	fullName := runtime.FuncForPC(pc).Name()
+	return fullName[strings.LastIndex(fullName, ".")+1:]
+}
+
 // All methods and functions which need to be overridden for dry run.
 
 func (d *DryRunClient) ContainerAttach(ctx context.Context, container string, options moby.ContainerAttachOptions) (moby.HijackedResponse, error) {
@@ -162,7 +169,14 @@ func (d *DryRunClient) ImageBuild(ctx context.Context, reader io.Reader, options
 }
 
 func (d *DryRunClient) ImageInspectWithRaw(ctx context.Context, imageName string) (moby.ImageInspect, []byte, error) {
-	return moby.ImageInspect{ID: "dryRunId"}, nil, nil
+	caller := getCallingFunction()
+	switch caller {
+	case "pullServiceImage", "buildContainerVolumes":
+		return moby.ImageInspect{ID: "dryRunId"}, nil, nil
+	default:
+		return d.apiClient.ImageInspectWithRaw(ctx, imageName)
+	}
+
 }
 
 func (d *DryRunClient) ImagePull(ctx context.Context, ref string, options moby.ImagePullOptions) (io.ReadCloser, error) {
@@ -204,7 +218,10 @@ func (d *DryRunClient) NetworkConnect(ctx context.Context, networkName, containe
 }
 
 func (d *DryRunClient) NetworkCreate(ctx context.Context, name string, options moby.NetworkCreate) (moby.NetworkCreateResponse, error) {
-	return moby.NetworkCreateResponse{}, ErrNotImplemented
+	return moby.NetworkCreateResponse{
+		ID:      name,
+		Warning: "",
+	}, nil
 }
 
 func (d *DryRunClient) NetworkDisconnect(ctx context.Context, networkName, container string, force bool) error {

pkg/compose/build.go

@@ -74,6 +74,16 @@ func (s *composeService) build(ctx context.Context, project *types.Project, opti
 				return nil
 			}
 
+			//TODO:glours - condition to be removed when dry-run support of build will be implemented.
+			if s.dryRun {
+				builder := "buildkit"
+				if !buildkitEnabled {
+					builder = "legacy builder"
+				}
+				fmt.Printf("%sBuilding image %s with %s\n", api.DRYRUN_PREFIX, service.Image, builder)
+				return nil
+			}
+
 			if !buildkitEnabled {
 				service.Build.Args = service.Build.Args.OverrideBy(args)
 				id, err := s.doBuildClassic(ctx, service)