From d245c6df29e0c124da25e25cd9fbc5f1095bb6f7 Mon Sep 17 00:00:00 2001
From: Matthew Heon <matthew.heon@pm.me>
Date: Fri, 15 Mar 2019 10:01:23 -0400
Subject: Switch Libpod over to new explicit named volumes

This swaps the previous handling (parse all volume mounts on the
container and look for ones that might refer to named volumes)
for the new, explicit named volume lists stored per-container.

It also deprecates force-removing volumes that are in use. I
don't know how we want to handle this yet, but leaving containers
that depend on a volume that no longer exists is definitely not
correct.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>
---
 libpod/boltdb_state.go | 79 ++++++++++++++++++--------------------------------
 1 file changed, 29 insertions(+), 50 deletions(-)

(limited to 'libpod/boltdb_state.go')

diff --git a/libpod/boltdb_state.go b/libpod/boltdb_state.go
index 92a7b1538..d8cfa2bda 100644
--- a/libpod/boltdb_state.go
+++ b/libpod/boltdb_state.go
@@ -1358,56 +1358,6 @@ func (s *BoltState) AddVolume(volume *Volume) error {
 	return err
 }
 
-// RemoveVolCtrDep updates the container dependencies sub bucket of the given volume.
-// It deletes it from the bucket when found.
-// This is important when force removing a volume and we want to get rid of the dependencies.
-func (s *BoltState) RemoveVolCtrDep(volume *Volume, ctrID string) error {
-	if ctrID == "" {
-		return nil
-	}
-
-	if !s.valid {
-		return ErrDBBadConfig
-	}
-
-	if !volume.valid {
-		return ErrVolumeRemoved
-	}
-
-	volName := []byte(volume.Name())
-
-	db, err := s.getDBCon()
-	if err != nil {
-		return err
-	}
-	defer s.closeDBCon(db)
-
-	err = db.Update(func(tx *bolt.Tx) error {
-		volBkt, err := getVolBucket(tx)
-		if err != nil {
-			return err
-		}
-
-		volDB := volBkt.Bucket(volName)
-		if volDB == nil {
-			volume.valid = false
-			return errors.Wrapf(ErrNoSuchVolume, "no volume with name %s found in database", volume.Name())
-		}
-
-		// Make a subbucket for the containers using the volume
-		ctrDepsBkt := volDB.Bucket(volDependenciesBkt)
-		depCtrID := []byte(ctrID)
-		if depExists := ctrDepsBkt.Get(depCtrID); depExists != nil {
-			if err := ctrDepsBkt.Delete(depCtrID); err != nil {
-				return errors.Wrapf(err, "error deleting container dependencies %q for volume %s in ctrDependencies bucket in DB", ctrID, volume.Name())
-			}
-		}
-
-		return nil
-	})
-	return err
-}
-
 // RemoveVolume removes the given volume from the state
 func (s *BoltState) RemoveVolume(volume *Volume) error {
 	if !s.valid {
@@ -1433,6 +1383,11 @@ func (s *BoltState) RemoveVolume(volume *Volume) error {
 			return err
 		}
 
+		ctrBkt, err := getCtrBucket(tx)
+		if err != nil {
+			return err
+		}
+
 		// Check if the volume exists
 		volDB := volBkt.Bucket(volName)
 		if volDB == nil {
@@ -1448,6 +1403,18 @@ func (s *BoltState) RemoveVolume(volume *Volume) error {
 		if volCtrsBkt != nil {
 			var deps []string
 			err = volCtrsBkt.ForEach(func(id, value []byte) error {
+				// Alright, this is ugly.
+				// But we need it to work around the change in
+				// volume dependency handling, to make sure that
+				// older Podman versions don't cause DB
+				// corruption.
+				// Look up all dependencies and see that they
+				// still exist before appending.
+				ctrExists := ctrBkt.Bucket(id)
+				if ctrExists == nil {
+					return nil
+				}
+
 				deps = append(deps, string(id))
 				return nil
 			})
@@ -1629,6 +1596,11 @@ func (s *BoltState) VolumeInUse(volume *Volume) ([]string, error) {
 			return err
 		}
 
+		ctrBucket, err := getCtrBucket(tx)
+		if err != nil {
+			return err
+		}
+
 		volDB := volBucket.Bucket([]byte(volume.Name()))
 		if volDB == nil {
 			volume.valid = false
@@ -1642,6 +1614,13 @@ func (s *BoltState) VolumeInUse(volume *Volume) ([]string, error) {
 
 		// Iterate through and add dependencies
 		err = dependsBkt.ForEach(func(id, value []byte) error {
+			// Look up all dependencies and see that they
+			// still exist before appending.
+			ctrExists := ctrBucket.Bucket(id)
+			if ctrExists == nil {
+				return nil
+			}
+
 			depCtrs = append(depCtrs, string(id))
 
 			return nil
-- 
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