Add support for overlay volume mounts in podman.

Add support -v for overlay volume mounts in podman.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Signed-off-by: Qi Wang <qiwan@redhat.com>

3 files changed, 30 insertions, 0 deletions

diff --git a/pkg/specgen/generate/container_create.go b/pkg/specgen/generate/container_create.go
index c1ceac69e..6dbc45c16 100644
--- a/pkg/specgen/generate/container_create.go
+++ b/pkg/specgen/generate/container_create.go
@@ -201,6 +201,9 @@ func createContainerOptions(ctx context.Context, rt *libpod.Runtime, s *specgen.
 	for _, volume := range volumes {
 		destinations = append(destinations, volume.Dest)
 	}
+	for _, overlayVolume := range s.OverlayVolumes {
+		destinations = append(destinations, overlayVolume.Destination)
+	}
 	options = append(options, libpod.WithUserVolumes(destinations))
 
 	if len(volumes) != 0 {
@@ -215,6 +218,17 @@ func createContainerOptions(ctx context.Context, rt *libpod.Runtime, s *specgen.
 		options = append(options, libpod.WithNamedVolumes(vols))
 	}
 
+	if len(s.OverlayVolumes) != 0 {
+		var vols []*libpod.ContainerOverlayVolume
+		for _, v := range s.OverlayVolumes {
+			vols = append(vols, &libpod.ContainerOverlayVolume{
+				Dest:   v.Destination,
+				Source: v.Source,
+			})
+		}
+		options = append(options, libpod.WithOverlayVolumes(vols))
+	}
+
 	if s.Command != nil {
 		options = append(options, libpod.WithCommand(s.Command))
 	}
diff --git a/pkg/specgen/specgen.go b/pkg/specgen/specgen.go
index a346a9742..c6079be33 100644
--- a/pkg/specgen/specgen.go
+++ b/pkg/specgen/specgen.go
@@ -198,6 +198,9 @@ type ContainerStorageConfig struct {
 	// there are conflicts.
 	// Optional.
 	Volumes []*NamedVolume `json:"volumes,omitempty"`
+	// Overlay volumes are named volumes that will be added to the container.
+	// Optional.
+	OverlayVolumes []*OverlayVolume `json:"overlay_volumes,omitempty"`
 	// Devices are devices that will be added to the container.
 	// Optional.
 	Devices []spec.LinuxDevice `json:"devices,omitempty"`
@@ -443,6 +446,15 @@ type NamedVolume struct {
 	Options []string
 }
 
+// OverlayVolume holds information about a overlay volume that will be mounted into
+// the container.
+type OverlayVolume struct {
+	// Destination is the absolute path where the mount will be placed in the container.
+	Destination string `json:"destination"`
+	// Source specifies the source path of the mount.
+	Source string `json:"source,omitempty"`
+}
+
 // PortMapping is one or more ports that will be mapped into the container.
 type PortMapping struct {
 	// HostIP is the IP that we will bind to on the host.
diff --git a/pkg/util/mountOpts.go b/pkg/util/mountOpts.go
index 416e60728..eab2657e3 100644
--- a/pkg/util/mountOpts.go
+++ b/pkg/util/mountOpts.go
@@ -33,6 +33,10 @@ func ProcessOptions(options []string, isTmpfs bool, sourcePath string) ([]string
 		// Some options have parameters - size, mode
 		splitOpt := strings.SplitN(opt, "=", 2)
 		switch splitOpt[0] {
+		case "O":
+			if len(options) > 1 {
+				return nil, errors.Wrapf(ErrDupeMntOption, "'O' option can not be used with other options")
+			}
 		case "exec", "noexec":
 			if foundExec {
 				return nil, errors.Wrapf(ErrDupeMntOption, "only one of 'noexec' and 'exec' can be used")