From fc6dcd12b3430f2d1ee495ef19d184a088f3bb34 Mon Sep 17 00:00:00 2001 From: Matthew Heon Date: Fri, 16 Sep 2022 15:00:37 -0400 Subject: Add support for 'image' volume driver We added the concept of image volumes in 2.2.0, to support inspecting an image from within a container. However, this is a strictly read-only mount, with no modification allowed. By contrast, the new `image` volume driver creates a c/storage container as its underlying storage, so we have a read/write layer. This, in and of itself, is not especially interesting, but what it will enable in the future is. If we add a new command to allow these image volumes to be committed, we can now distribute volumes - and changes to them - via a standard OCI image registry (which is rather new and quite exciting). Future work in this area: - Add support for `podman volume push` (commit volume changes and push resulting image to OCI registry). - Add support for `podman volume pull` (currently, we require that the image a volume is created from be already pulled; it would be simpler if we had a dedicated command that did the pull and made a volume from it) - Add support for scratch images (make an empty image on demand to use as the base of the volume) - Add UOR support to `podman volume push` and `podman volume pull` to enable both with non-image volume drivers Signed-off-by: Matthew Heon --- libpod/define/volume_inspect.go | 3 +++ 1 file changed, 3 insertions(+) (limited to 'libpod/define/volume_inspect.go') diff --git a/libpod/define/volume_inspect.go b/libpod/define/volume_inspect.go index 76120647c..4d6f12080 100644 --- a/libpod/define/volume_inspect.go +++ b/libpod/define/volume_inspect.go @@ -58,6 +58,9 @@ type InspectVolumeData struct { NeedsChown bool `json:"NeedsChown,omitempty"` // Timeout is the specified driver timeout if given Timeout uint `json:"Timeout,omitempty"` + // StorageID is the ID of the container backing the volume in c/storage. + // Only used with Image Volumes. + StorageID string `json:"StorageID,omitempty"` } type VolumeReload struct { -- cgit v1.2.3-54-g00ecf