podman remote-client commit

add the ability to commit a container to an image using the remote
client.

Signed-off-by: baude <bbaude@redhat.com>

3 files changed, 137 insertions, 9 deletions

diff --git a/pkg/adapter/containers.go b/pkg/adapter/containers.go
index ff7b6377a..34ee70d3d 100644
--- a/pkg/adapter/containers.go
+++ b/pkg/adapter/containers.go
@@ -6,6 +6,7 @@ import (
 	"bufio"
 	"context"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -15,9 +16,12 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/containers/buildah"
+	"github.com/containers/image/manifest"
 	"github.com/containers/libpod/cmd/podman/cliconfig"
 	"github.com/containers/libpod/cmd/podman/shared"
 	"github.com/containers/libpod/libpod"
+	"github.com/containers/libpod/libpod/image"
 	"github.com/containers/libpod/pkg/adapter/shortcuts"
 	"github.com/containers/libpod/pkg/systemdgen"
 	"github.com/containers/psgo"
@@ -1030,3 +1034,55 @@ func (r *LocalRuntime) GenerateSystemd(c *cliconfig.GenerateSystemdValues) (stri
 func (r *LocalRuntime) GetNamespaces(container shared.PsContainerOutput) *shared.Namespace {
 	return shared.GetNamespaces(container.Pid)
 }
+
+// Commit creates a local image from a container
+func (r *LocalRuntime) Commit(ctx context.Context, c *cliconfig.CommitValues, container, imageName string) (string, error) {
+	var (
+		writer   io.Writer
+		mimeType string
+	)
+	switch c.Format {
+	case "oci":
+		mimeType = buildah.OCIv1ImageManifest
+		if c.Flag("message").Changed {
+			return "", errors.Errorf("messages are only compatible with the docker image format (-f docker)")
+		}
+	case "docker":
+		mimeType = manifest.DockerV2Schema2MediaType
+	default:
+		return "", errors.Errorf("unrecognized image format %q", c.Format)
+	}
+	if !c.Quiet {
+		writer = os.Stderr
+	}
+	ctr, err := r.Runtime.LookupContainer(container)
+	if err != nil {
+		return "", errors.Wrapf(err, "error looking up container %q", container)
+	}
+
+	rtc, err := r.Runtime.GetConfig()
+	if err != nil {
+		return "", err
+	}
+
+	sc := image.GetSystemContext(rtc.SignaturePolicyPath, "", false)
+	coptions := buildah.CommitOptions{
+		SignaturePolicyPath:   rtc.SignaturePolicyPath,
+		ReportWriter:          writer,
+		SystemContext:         sc,
+		PreferredManifestType: mimeType,
+	}
+	options := libpod.ContainerCommitOptions{
+		CommitOptions:  coptions,
+		Pause:          c.Pause,
+		IncludeVolumes: c.IncludeVolumes,
+		Message:        c.Message,
+		Changes:        c.Change,
+		Author:         c.Author,
+	}
+	newImage, err := ctr.Commit(ctx, imageName, options)
+	if err != nil {
+		return "", err
+	}
+	return newImage.ID(), nil
+}
diff --git a/pkg/adapter/containers_remote.go b/pkg/adapter/containers_remote.go
index c34495b3d..891a2137b 100644
--- a/pkg/adapter/containers_remote.go
+++ b/pkg/adapter/containers_remote.go
@@ -986,3 +986,26 @@ func (r *LocalRuntime) GetNamespaces(container shared.PsContainerOutput) *shared
 	}
 	return &ns
 }
+
+// Commit creates a local image from a container
+func (r *LocalRuntime) Commit(ctx context.Context, c *cliconfig.CommitValues, container, imageName string) (string, error) {
+	var iid string
+	reply, err := iopodman.Commit().Send(r.Conn, varlink.More, container, imageName, c.Change, c.Author, c.Message, c.Pause, c.Format)
+	if err != nil {
+		return "", err
+	}
+	for {
+		responses, flags, err := reply()
+		if err != nil {
+			return "", err
+		}
+		for _, line := range responses.Logs {
+			fmt.Fprintln(os.Stderr, line)
+		}
+		iid = responses.Id
+		if flags&varlink.Continues == 0 {
+			break
+		}
+	}
+	return iid, nil
+}
diff --git a/pkg/varlinkapi/images.go b/pkg/varlinkapi/images.go
index fa1a0a109..1abc4f086 100644
--- a/pkg/varlinkapi/images.go
+++ b/pkg/varlinkapi/images.go
@@ -371,7 +371,6 @@ func (i *LibpodAPI) PushImage(call iopodman.VarlinkCall, name, tag string, compr
 				done = true
 			default:
 				if !call.WantsMore() {
-					time.Sleep(1 * time.Second)
 					break
 				}
 				br := iopodman.MoreResponse{
@@ -495,6 +494,9 @@ func (i *LibpodAPI) DeleteUnusedImages(call iopodman.VarlinkCall) error {
 
 // Commit ...
 func (i *LibpodAPI) Commit(call iopodman.VarlinkCall, name, imageName string, changes []string, author, message string, pause bool, manifestType string) error {
+	var newImage *image.Image
+
+	output := bytes.NewBuffer([]byte{})
 	ctr, err := i.Runtime.LookupContainer(name)
 	if err != nil {
 		return call.ReplyContainerNotFound(name, err.Error())
@@ -515,7 +517,7 @@ func (i *LibpodAPI) Commit(call iopodman.VarlinkCall, name, imageName string, ch
 	}
 	coptions := buildah.CommitOptions{
 		SignaturePolicyPath:   rtc.SignaturePolicyPath,
-		ReportWriter:          nil,
+		ReportWriter:          output,
 		SystemContext:         sc,
 		PreferredManifestType: mimeType,
 	}
@@ -527,11 +529,61 @@ func (i *LibpodAPI) Commit(call iopodman.VarlinkCall, name, imageName string, ch
 		Author:        author,
 	}
 
-	newImage, err := ctr.Commit(getContext(), imageName, options)
-	if err != nil {
-		return call.ReplyErrorOccurred(err.Error())
+	if call.WantsMore() {
+		call.Continues = true
 	}
-	return call.ReplyCommit(newImage.ID())
+
+	c := make(chan error)
+
+	go func() {
+		newImage, err = ctr.Commit(getContext(), imageName, options)
+		if err != nil {
+			c <- err
+		}
+		c <- nil
+		close(c)
+	}()
+
+	var log []string
+	done := false
+	for {
+		line, err := output.ReadString('\n')
+		if err == nil {
+			log = append(log, line)
+			continue
+		} else if err == io.EOF {
+			select {
+			case err := <-c:
+				if err != nil {
+					logrus.Errorf("reading of output during commit failed for %s", name)
+					return call.ReplyErrorOccurred(err.Error())
+				}
+				done = true
+			default:
+				if !call.WantsMore() {
+					break
+				}
+				br := iopodman.MoreResponse{
+					Logs: log,
+				}
+				call.ReplyCommit(br)
+				log = []string{}
+			}
+		} else {
+			return call.ReplyErrorOccurred(err.Error())
+		}
+		if done {
+			break
+		}
+	}
+	call.Continues = false
+
+	br := iopodman.MoreResponse{
+		Logs: log,
+		Id:   newImage.ID(),
+	}
+
+	return call.ReplyCommit(br)
 }
 
 // ImportImage imports an image from a tarball to the image store
@@ -633,7 +685,6 @@ func (i *LibpodAPI) PullImage(call iopodman.VarlinkCall, name string) error {
 				done = true
 			default:
 				if !call.WantsMore() {
-					time.Sleep(1 * time.Second)
 					break
 				}
 				br := iopodman.MoreResponse{
@@ -764,7 +815,6 @@ func (i *LibpodAPI) ImageSave(call iopodman.VarlinkCall, options iopodman.ImageS
 				done = true
 			default:
 				if !call.WantsMore() {
-					time.Sleep(1 * time.Second)
 					break
 				}
 				br := iopodman.MoreResponse{
@@ -844,7 +894,6 @@ func (i *LibpodAPI) LoadImage(call iopodman.VarlinkCall, name, inputFile string,
 				done = true
 			default:
 				if !call.WantsMore() {
-					time.Sleep(1 * time.Second)
 					break
 				}
 				br := iopodman.MoreResponse{