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>

1 files changed, 43 insertions, 0 deletions

diff --git a/libpod/runtime_ctr.go b/libpod/runtime_ctr.go
index 6d5ce5a7e..9afdef7b6 100644
--- a/libpod/runtime_ctr.go
+++ b/libpod/runtime_ctr.go
@@ -2,9 +2,11 @@ package libpod
 
 import (
 	"context"
+	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 
@@ -521,3 +523,44 @@ func isNamedVolume(volName string) bool {
 	}
 	return false
 }
+
+// Export is the libpod portion of exporting a container to a tar file
+func (r *Runtime) Export(name string, path string) error {
+	ctr, err := r.LookupContainer(name)
+	if err != nil {
+		return err
+	}
+	if os.Geteuid() != 0 {
+		state, err := ctr.State()
+		if err != nil {
+			return errors.Wrapf(err, "cannot read container state %q", ctr.ID())
+		}
+		if state == ContainerStateRunning || state == 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)
+
+}