podman-remote import|export

addition of import and export for the podman-remote client.  This includes
the ability to send and receive files between the remote-client and the
"podman" host using an upgraded varlink connection.

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

3 files changed, 142 insertions, 0 deletions

diff --git a/libpod/adapter/client.go b/libpod/adapter/client.go
index b3bb9acae..6512a5952 100644
--- a/libpod/adapter/client.go
+++ b/libpod/adapter/client.go
@@ -34,3 +34,14 @@ func (r RemoteRuntime) Connect() (*varlink.Connection, error) {
 	}
 	return connection, nil
 }
+
+// RefreshConnection is used to replace the current r.Conn after things like
+// using an upgraded varlink connection
+func (r RemoteRuntime) RefreshConnection() error {
+	newConn, err := r.Connect()
+	if err != nil {
+		return err
+	}
+	r.Conn = newConn
+	return nil
+}
diff --git a/libpod/adapter/runtime.go b/libpod/adapter/runtime.go
index 007257714..2c408dd2f 100644
--- a/libpod/adapter/runtime.go
+++ b/libpod/adapter/runtime.go
@@ -4,12 +4,17 @@ package adapter
 
 import (
 	"context"
+	"github.com/pkg/errors"
 	"io"
+	"io/ioutil"
+	"os"
+	"strconv"
 
 	"github.com/containers/image/types"
 	"github.com/containers/libpod/cmd/podman/libpodruntime"
 	"github.com/containers/libpod/libpod"
 	"github.com/containers/libpod/libpod/image"
+	"github.com/containers/libpod/pkg/rootless"
 	"github.com/urfave/cli"
 )
 
@@ -104,3 +109,49 @@ func (r *LocalRuntime) LookupContainer(idOrName string) (*Container, error) {
 func (r *LocalRuntime) PruneImages(all bool) ([]string, error) {
 	return r.ImageRuntime().PruneImages(all)
 }
+
+// Export is a wrapper to container export to a tarfile
+func (r *LocalRuntime) Export(name string, path string) error {
+	ctr, err := r.Runtime.LookupContainer(name)
+	if err != nil {
+		return errors.Wrapf(err, "error looking up container %q", name)
+	}
+	if os.Geteuid() != 0 {
+		state, err := ctr.State()
+		if err != nil {
+			return errors.Wrapf(err, "cannot read container state %q", ctr.ID())
+		}
+		if state == libpod.ContainerStateRunning || state == libpod.ContainerStatePaused {
+			data, err := ioutil.ReadFile(ctr.Config().ConmonPidFile)
+			if err != nil {
+				return errors.Wrapf(err, "cannot read conmon PID file %q", ctr.Config().ConmonPidFile)
+			}
+			conmonPid, err := strconv.Atoi(string(data))
+			if err != nil {
+				return errors.Wrapf(err, "cannot parse PID %q", data)
+			}
+			became, ret, err := rootless.JoinDirectUserAndMountNS(uint(conmonPid))
+			if err != nil {
+				return err
+			}
+			if became {
+				os.Exit(ret)
+			}
+		} else {
+			became, ret, err := rootless.BecomeRootInUserNS()
+			if err != nil {
+				return err
+			}
+			if became {
+				os.Exit(ret)
+			}
+		}
+	}
+
+	return ctr.Export(path)
+}
+
+// Import is a wrapper to import a container image
+func (r *LocalRuntime) Import(ctx context.Context, source, reference string, changes []string, history string, quiet bool) (string, error) {
+	return r.Runtime.Import(ctx, source, reference, changes, history, quiet)
+}
diff --git a/libpod/adapter/runtime_remote.go b/libpod/adapter/runtime_remote.go
index 0633c036d..07c786184 100644
--- a/libpod/adapter/runtime_remote.go
+++ b/libpod/adapter/runtime_remote.go
@@ -3,11 +3,13 @@
 package adapter
 
 import (
+	"bufio"
 	"context"
 	"encoding/json"
 	"fmt"
 	"github.com/pkg/errors"
 	"io"
+	"os"
 	"strings"
 	"time"
 
@@ -324,6 +326,84 @@ func (r *LocalRuntime) Config(name string) *libpod.ContainerConfig {
 	return &data
 
 }
+
+// PruneImages is the wrapper call for a remote-client to prune images
 func (r *LocalRuntime) PruneImages(all bool) ([]string, error) {
 	return iopodman.ImagesPrune().Call(r.Conn, all)
 }
+
+// Export is a wrapper to container export to a tarfile
+func (r *LocalRuntime) Export(name string, path string) error {
+	tempPath, err := iopodman.ExportContainer().Call(r.Conn, name, "")
+	if err != nil {
+		return err
+	}
+
+	outputFile, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer outputFile.Close()
+
+	writer := bufio.NewWriter(outputFile)
+	defer writer.Flush()
+
+	reply, err := iopodman.ReceiveFile().Send(r.Conn, varlink.Upgrade, tempPath, true)
+	if err != nil {
+		return err
+	}
+
+	length, _, err := reply()
+	if err != nil {
+		return errors.Wrap(err, "unable to get file length for transfer")
+	}
+
+	reader := r.Conn.Reader
+	if _, err := io.CopyN(writer, reader, length); err != nil {
+		return errors.Wrap(err, "file transer failed")
+	}
+
+	return nil
+}
+
+// Import implements the remote calls required to import a container image to the store
+func (r *LocalRuntime) Import(ctx context.Context, source, reference string, changes []string, history string, quiet bool) (string, error) {
+	// First we send the file to the host
+	fs, err := os.Open(source)
+	if err != nil {
+		return "", err
+	}
+
+	fileInfo, err := fs.Stat()
+	if err != nil {
+		return "", err
+	}
+	reply, err := iopodman.SendFile().Send(r.Conn, varlink.Upgrade, "", int64(fileInfo.Size()))
+	if err != nil {
+		return "", err
+	}
+	_, _, err = reply()
+	if err != nil {
+		return "", err
+	}
+
+	reader := bufio.NewReader(fs)
+	_, err = reader.WriteTo(r.Conn.Writer)
+	if err != nil {
+		return "", err
+	}
+	r.Conn.Writer.Flush()
+
+	// All was sent, wait for the ACK from the server
+	tempFile, err := r.Conn.Reader.ReadString(':')
+	if err != nil {
+		return "", err
+	}
+
+	// r.Conn is kaput at this point due to the upgrade
+	if err := r.RemoteRuntime.RefreshConnection(); err != nil {
+		return "", err
+
+	}
+	return iopodman.ImportImage().Call(r.Conn, strings.TrimRight(tempFile, ":"), reference, history, changes, true)
+}