Re-add locks to volumes.

This will require a 'podman system renumber' after being applied
to get lock numbers for existing volumes.

Add the DB backend code for rewriting volume configs and use it
for updating lock numbers as part of 'system renumber'.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/libpod/in_memory_state.go b/libpod/in_memory_state.go
index 7c4abd25d..a9b735327 100644
--- a/libpod/in_memory_state.go
+++ b/libpod/in_memory_state.go
@@ -425,6 +425,26 @@ func (s *InMemoryState) RewritePodConfig(pod *Pod, newCfg *PodConfig) error {
 	return nil
 }
 
+// RewriteVolumeConfig rewrites a volume's configuration.
+// This function is DANGEROUS, even with in-memory state.
+// Please read the full comment in state.go before using it.
+func (s *InMemoryState) RewriteVolumeConfig(volume *Volume, newCfg *VolumeConfig) error {
+	if !volume.valid {
+		return define.ErrVolumeRemoved
+	}
+
+	// If the volume does not exist, return error
+	stateVol, ok := s.volumes[volume.Name()]
+	if !ok {
+		volume.valid = false
+		return errors.Wrapf(define.ErrNoSuchVolume, "volume with name %q not found in state", volume.Name())
+	}
+
+	stateVol.config = newCfg
+
+	return nil
+}
+
 // Volume retrieves a volume from its full name
 func (s *InMemoryState) Volume(name string) (*Volume, error) {
 	if name == "" {