podmanv2 mount and umount

add the ability to mount and unmount containers for the local client only

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

4 files changed, 125 insertions, 0 deletions

diff --git a/pkg/domain/entities/containers.go b/pkg/domain/entities/containers.go
index 4508f9c2c..f21af9ce4 100644
--- a/pkg/domain/entities/containers.go
+++ b/pkg/domain/entities/containers.go
@@ -297,3 +297,33 @@ type ContainerInitReport struct {
 	Err error
 	Id  string
 }
+
+//ContainerMountOptions describes the input values for mounting containers
+// in the CLI
+type ContainerMountOptions struct {
+	All        bool
+	Format     string
+	Latest     bool
+	NoTruncate bool
+}
+
+// ContainerUnmountOptions are the options from the cli for unmounting
+type ContainerUnmountOptions struct {
+	All    bool
+	Force  bool
+	Latest bool
+}
+
+// ContainerMountReport describes the response from container mount
+type ContainerMountReport struct {
+	Err  error
+	Id   string
+	Name string
+	Path string
+}
+
+// ContainerUnmountReport describes the response from umounting a container
+type ContainerUnmountReport struct {
+	Err error
+	Id  string
+}
diff --git a/pkg/domain/entities/engine_container.go b/pkg/domain/entities/engine_container.go
index d23006a38..cf66f6ac2 100644
--- a/pkg/domain/entities/engine_container.go
+++ b/pkg/domain/entities/engine_container.go
@@ -21,6 +21,7 @@ type ContainerEngine interface {
 	ContainerInspect(ctx context.Context, namesOrIds []string, options InspectOptions) ([]*ContainerInspectReport, error)
 	ContainerKill(ctx context.Context, namesOrIds []string, options KillOptions) ([]*KillReport, error)
 	ContainerList(ctx context.Context, options ContainerListOptions) ([]ListContainer, error)
+	ContainerMount(ctx context.Context, nameOrIds []string, options ContainerMountOptions) ([]*ContainerMountReport, error)
 	ContainerPause(ctx context.Context, namesOrIds []string, options PauseUnPauseOptions) ([]*PauseUnpauseReport, error)
 	ContainerLogs(ctx context.Context, containers []string, options ContainerLogsOptions) error
 	ContainerRestart(ctx context.Context, namesOrIds []string, options RestartOptions) ([]*RestartReport, error)
@@ -30,6 +31,7 @@ type ContainerEngine interface {
 	ContainerStart(ctx context.Context, namesOrIds []string, options ContainerStartOptions) ([]*ContainerStartReport, error)
 	ContainerStop(ctx context.Context, namesOrIds []string, options StopOptions) ([]*StopReport, error)
 	ContainerTop(ctx context.Context, options TopOptions) (*StringSliceReport, error)
+	ContainerUnmount(ctx context.Context, nameOrIds []string, options ContainerUnmountOptions) ([]*ContainerUnmountReport, error)
 	ContainerUnpause(ctx context.Context, namesOrIds []string, options PauseUnPauseOptions) ([]*PauseUnpauseReport, error)
 	ContainerWait(ctx context.Context, namesOrIds []string, options WaitOptions) ([]WaitReport, error)
 	HealthCheckRun(ctx context.Context, nameOrId string, options HealthCheckOptions) (*define.HealthCheckResults, error)
diff --git a/pkg/domain/infra/abi/containers.go b/pkg/domain/infra/abi/containers.go
index a3a0a8202..92668190c 100644
--- a/pkg/domain/infra/abi/containers.go
+++ b/pkg/domain/infra/abi/containers.go
@@ -6,6 +6,7 @@ import (
 	"context"
 	"fmt"
 	"io/ioutil"
+	"os"
 	"strconv"
 	"strings"
 	"sync"
@@ -21,9 +22,11 @@ import (
 	"github.com/containers/libpod/pkg/domain/entities"
 	"github.com/containers/libpod/pkg/domain/infra/abi/terminal"
 	"github.com/containers/libpod/pkg/ps"
+	"github.com/containers/libpod/pkg/rootless"
 	"github.com/containers/libpod/pkg/signal"
 	"github.com/containers/libpod/pkg/specgen"
 	"github.com/containers/libpod/pkg/specgen/generate"
+	"github.com/containers/storage"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -808,3 +811,85 @@ func (ic *ContainerEngine) ContainerInit(ctx context.Context, namesOrIds []strin
 	}
 	return reports, nil
 }
+
+func (ic *ContainerEngine) ContainerMount(ctx context.Context, nameOrIds []string, options entities.ContainerMountOptions) ([]*entities.ContainerMountReport, error) {
+	if os.Geteuid() != 0 {
+		if driver := ic.Libpod.StorageConfig().GraphDriverName; driver != "vfs" {
+			// Do not allow to mount a graphdriver that is not vfs if we are creating the userns as part
+			// of the mount command.
+			return nil, fmt.Errorf("cannot mount using driver %s in rootless mode", driver)
+		}
+
+		became, ret, err := rootless.BecomeRootInUserNS("")
+		if err != nil {
+			return nil, err
+		}
+		if became {
+			os.Exit(ret)
+		}
+	}
+	var reports []*entities.ContainerMountReport
+	ctrs, err := getContainersByContext(options.All, options.Latest, nameOrIds, ic.Libpod)
+	if err != nil {
+		return nil, err
+	}
+	for _, ctr := range ctrs {
+		report := entities.ContainerMountReport{Id: ctr.ID()}
+		report.Path, report.Err = ctr.Mount()
+		reports = append(reports, &report)
+	}
+	if len(reports) > 0 {
+		return reports, nil
+	}
+
+	// No containers were passed, so we send back what is mounted
+	ctrs, err = getContainersByContext(true, false, []string{}, ic.Libpod)
+	if err != nil {
+		return nil, err
+	}
+	for _, ctr := range ctrs {
+		mounted, path, err := ctr.Mounted()
+		if err != nil {
+			return nil, err
+		}
+
+		if mounted {
+			reports = append(reports, &entities.ContainerMountReport{
+				Id:   ctr.ID(),
+				Name: ctr.Name(),
+				Path: path,
+			})
+		}
+	}
+	return reports, nil
+}
+
+func (ic *ContainerEngine) ContainerUnmount(ctx context.Context, nameOrIds []string, options entities.ContainerUnmountOptions) ([]*entities.ContainerUnmountReport, error) {
+	var reports []*entities.ContainerUnmountReport
+	ctrs, err := getContainersByContext(options.All, options.Latest, nameOrIds, ic.Libpod)
+	if err != nil {
+		return nil, err
+	}
+	for _, ctr := range ctrs {
+		state, err := ctr.State()
+		if err != nil {
+			logrus.Debugf("Error umounting container %s state: %s", ctr.ID(), err.Error())
+			continue
+		}
+		if state == define.ContainerStateRunning {
+			logrus.Debugf("Error umounting container %s, is running", ctr.ID())
+			continue
+		}
+
+		report := entities.ContainerUnmountReport{Id: ctr.ID()}
+		if err := ctr.Unmount(options.Force); err != nil {
+			if options.All && errors.Cause(err) == storage.ErrLayerNotMounted {
+				logrus.Debugf("Error umounting container %s, storage.ErrLayerNotMounted", ctr.ID())
+				continue
+			}
+			report.Err = errors.Wrapf(err, "error unmounting container %s", ctr.ID())
+		}
+		reports = append(reports, &report)
+	}
+	return reports, nil
+}
diff --git a/pkg/domain/infra/tunnel/containers.go b/pkg/domain/infra/tunnel/containers.go
index 1a430e3d0..fb75a03d9 100644
--- a/pkg/domain/infra/tunnel/containers.go
+++ b/pkg/domain/infra/tunnel/containers.go
@@ -354,3 +354,11 @@ func (ic *ContainerEngine) ContainerInit(ctx context.Context, namesOrIds []strin
 	}
 	return reports, nil
 }
+
+func (ic *ContainerEngine) ContainerMount(ctx context.Context, nameOrIds []string, options entities.ContainerMountOptions) ([]*entities.ContainerMountReport, error) {
+	return nil, errors.New("mounting containers is not supported for remote clients")
+}
+
+func (ic *ContainerEngine) ContainerUnmount(ctx context.Context, nameOrIds []string, options entities.ContainerUnmountOptions) ([]*entities.ContainerUnmountReport, error) {
+	return nil, errors.New("unmounting containers is not supported for remote clients")
+}