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| author | Matthew Heon <matthew.heon@pm.me> | 2022-09-16 15:00:37 -0400 |
|---|---|---|
| committer | Matthew Heon <mheon@redhat.com> | 2022-09-22 13:07:40 -0400 |
| commit | fc6dcd12b3430f2d1ee495ef19d184a088f3bb34 (patch) | |
| tree | 0037ce64d14f971fec5cd29e16a63e7a0f331dc1 /libpod/state.go | |
| parent | 08993516a939576fa009db6e7ed32524026a822d (diff) | |
| download | podman-fc6dcd12b3430f2d1ee495ef19d184a088f3bb34.tar.gz podman-fc6dcd12b3430f2d1ee495ef19d184a088f3bb34.tar.bz2 podman-fc6dcd12b3430f2d1ee495ef19d184a088f3bb34.zip | |
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 <matthew.heon@pm.me>
Diffstat (limited to 'libpod/state.go')
| -rw-r--r-- | libpod/state.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libpod/state.go b/libpod/state.go index 4fbd3c302..9d9604563 100644 --- a/libpod/state.go +++ b/libpod/state.go @@ -144,6 +144,14 @@ type State interface { // As with RemoveExecSession, container state will not be modified. RemoveContainerExecSessions(ctr *Container) error + // ContainerIDIsVolume checks if the given container ID is in use by a + // volume. + // Some volumes are backed by a c/storage container. These do not have a + // corresponding Container struct in Libpod, but rather a Volume. + // This determines if a given ID from c/storage is used as a backend by + // a Podman volume. + ContainerIDIsVolume(id string) (bool, error) + // PLEASE READ FULL DESCRIPTION BEFORE USING. // Rewrite a container's configuration. // This function breaks libpod's normal prohibition on a read-only |