new "image" mount type

Add a new "image" mount type to `--mount`.  The source of the mount is
the name or ID of an image.  The destination is the path inside the
container.  Image mounts further support an optional `rw,readwrite`
parameter which if set to "true" will yield the mount writable inside
the container.  Note that no changes are propagated to the image mount
on the host (which in any case is read only).

Mounts are overlay mounts.  To support read-only overlay mounts, vendor
a non-release version of Buildah.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/libpod/container.go b/libpod/container.go
index 01419500e..ea5a6e09c 100644
--- a/libpod/container.go
+++ b/libpod/container.go
@@ -235,6 +235,19 @@ type ContainerOverlayVolume struct {
 	Source string `json:"source,omitempty"`
 }
 
+// ContainerImageVolume is a volume based on a container image.  The container
+// image is first mounted on the host and is then bind-mounted into the
+// container.
+type ContainerImageVolume struct {
+	// Source is the source of the image volume.  The image can be referred
+	// to by name and by ID.
+	Source string `json:"source"`
+	// Dest is the absolute path of the mount in the container.
+	Dest string `json:"dest"`
+	// ReadWrite sets the volume writable.
+	ReadWrite bool `json:"rw"`
+}
+
 // Config accessors
 // Unlocked