diff options
Diffstat (limited to 'libpod')
| -rw-r--r-- | libpod/container_config.go | 2 | ||||
| -rw-r--r-- | libpod/container_internal.go | 38 | ||||
| -rw-r--r-- | libpod/options.go | 3 |
3 files changed, 42 insertions, 1 deletions
diff --git a/libpod/container_config.go b/libpod/container_config.go index b80b23c25..a2c989a1a 100644 --- a/libpod/container_config.go +++ b/libpod/container_config.go @@ -107,6 +107,8 @@ type ContainerRootFSConfig struct { // as the container's root. // Conflicts with RootfsImageID. Rootfs string `json:"rootfs,omitempty"` + // RootfsOverlay tells if rootfs has to be mounted as an overlay + RootfsOverlay bool `json:"rootfs_overlay,omitempty"` // ShmDir is the path to be mounted on /dev/shm in container. // If not set manually at creation time, Libpod will create a tmpfs // with the size specified in ShmSize and populate this with the path of diff --git a/libpod/container_internal.go b/libpod/container_internal.go index 4d1a25541..63683a8b8 100644 --- a/libpod/container_internal.go +++ b/libpod/container_internal.go @@ -15,6 +15,7 @@ import ( metadata "github.com/checkpoint-restore/checkpointctl/lib" "github.com/containers/buildah/copier" + "github.com/containers/buildah/pkg/overlay" butil "github.com/containers/buildah/util" "github.com/containers/podman/v3/libpod/define" "github.com/containers/podman/v3/libpod/events" @@ -1541,6 +1542,32 @@ func (c *Container) mountStorage() (_ string, deferredErr error) { // We need to mount the container before volumes - to ensure the copyup // works properly. mountPoint := c.config.Rootfs + // Check if overlay has to be created on top of Rootfs + if c.config.RootfsOverlay { + overlayDest := c.runtime.store.GraphRoot() + contentDir, err := overlay.GenerateStructure(c.runtime.store.GraphRoot(), c.ID(), "rootfs", c.RootUID(), c.RootGID()) + if err != nil { + return "", errors.Wrapf(err, "rootfs-overlay: failed to create TempDir in the %s directory", overlayDest) + } + overlayMount, err := overlay.Mount(contentDir, c.config.Rootfs, overlayDest, c.RootUID(), c.RootGID(), c.runtime.store.GraphOptions()) + if err != nil { + return "", errors.Wrapf(err, "rootfs-overlay: creating overlay failed %q", c.config.Rootfs) + } + + // Seems fuse-overlayfs is not present + // fallback to native overlay + if overlayMount.Type == "overlay" { + overlayMount.Options = append(overlayMount.Options, "nodev") + mountOpts := label.FormatMountLabel(strings.Join(overlayMount.Options, ","), c.MountLabel()) + err = mount.Mount("overlay", overlayMount.Source, overlayMount.Type, mountOpts) + if err != nil { + return "", errors.Wrapf(err, "rootfs-overlay: creating overlay failed %q from native overlay", c.config.Rootfs) + } + } + + mountPoint = overlayMount.Source + } + if mountPoint == "" { mountPoint, err = c.mount() if err != nil { @@ -1714,6 +1741,17 @@ func (c *Container) cleanupStorage() error { var cleanupErr error + // umount rootfs overlay if it was created + if c.config.RootfsOverlay { + overlayBasePath := c.runtime.store.GraphRoot() + overlayBasePath = filepath.Join(overlayBasePath, "rootfs") + if err := overlay.Unmount(overlayBasePath); err != nil { + // If the container can't remove content report the error + logrus.Errorf("Failed to cleanup overlay mounts for %s: %v", c.ID(), err) + cleanupErr = err + } + } + for _, containerMount := range c.config.Mounts { if err := c.unmountSHM(containerMount); err != nil { if cleanupErr != nil { diff --git a/libpod/options.go b/libpod/options.go index 4cbd2b5e2..7b0c6641a 100644 --- a/libpod/options.go +++ b/libpod/options.go @@ -1337,7 +1337,7 @@ func WithCommand(command []string) CtrCreateOption { // WithRootFS sets the rootfs for the container. // This creates a container from a directory on disk and not an image. -func WithRootFS(rootfs string) CtrCreateOption { +func WithRootFS(rootfs string, overlay bool) CtrCreateOption { return func(ctr *Container) error { if ctr.valid { return define.ErrCtrFinalized @@ -1346,6 +1346,7 @@ func WithRootFS(rootfs string) CtrCreateOption { return err } ctr.config.Rootfs = rootfs + ctr.config.RootfsOverlay = overlay return nil } } |