When first mounting any named volume, copy up

Previously, we only did this for volumes created at the same time
as the container. However, this is not correct behavior - Docker
does so for all named volumes, even those made with
'podman volume create' and mounted into a container later.

Fixes #3945

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

1 files changed, 7 insertions, 0 deletions

diff --git a/libpod/volume.go b/libpod/volume.go
index b4de3aedc..c4771bbb8 100644
--- a/libpod/volume.go
+++ b/libpod/volume.go
@@ -57,6 +57,13 @@ type VolumeState struct {
 	// On incrementing from 0, the volume will be mounted on the host.
 	// On decrementing to 0, the volume will be unmounted on the host.
 	MountCount uint `json:"mountCount"`
+	// NeedsCopyUp indicates that the next time the volume is mounted into
+	// a container, the container will "copy up" the contents of the
+	// mountpoint into the volume.
+	// This should only be done once. As such, this is set at container
+	// create time, then cleared after the copy up is done and never set
+	// again.
+	NeedsCopyUp bool `json:"notYetMounted,omitempty"`
 }
 
 // Name retrieves the volume's name